[oe] [PATCH 1/4] mozjs: port build to python3

Khem Raj raj.khem at gmail.com
Sat Feb 1 17:49:55 UTC 2020


Andreas

Thanks a bunch for doing this work. This is a significant patch to 
support deprecating py2, I have put it through CI lets see what we find

Cheers
-Khem

On 2/1/20 8:37 AM, Andreas Müller wrote:
> While at it:
> 
> * cleanup our patches
> * remove useless sed in do_configure
> 


> Signed-off-by: Andreas Müller <schnitzeltony at gmail.com>
> ---
>   .../mozjs/0001-Port-build-to-python3.patch    | 6888 +++++++++++++++++
>   ...nclude-RequiredDefines.h-for-depend.patch} |    0
>   ...x-cross-compilation-on-i586-targets.patch} |    0
>   ...04-do-not-create-python-environment.patch} |    0
>   ....patch => 0005-fix-cannot-find-link.patch} |    0
>   ...ound-autoconf-2.13-detection-failed.patch} |    0
>   ... 0007-fix-do_compile-failed-on-mips.patch} |    0
>   ...ort.patch => 0008-add-riscv-support.patch} |    0
>   ...mozjs-fix-coredump-caused-by-getenv.patch} |    0
>   ...rflow.patch => 0010-format-overflow.patch} |    0
>   ... 0011-To-fix-build-error-on-arm32BE.patch} |    0
>   ...LIC_API.patch => 0012-JS_PUBLIC_API.patch} |    0
>   ...013-riscv-Disable-atomic-operations.patch} |    0
>   ... 0014-fallback-to-2011-C++-standard.patch} |    0
>   ...-compiling-failure-on-mips64-n32-bsp.patch |    0
>   .../0001-support-musl.patch}                  |    0
>   .../0002-js-Fix-build-with-musl.patch}        |    0
>   .../recipes-extended/mozjs/mozjs_60.9.0.bb    |   56 +-
>   18 files changed, 6917 insertions(+), 27 deletions(-)
>   create mode 100644 meta-oe/recipes-extended/mozjs/mozjs/0001-Port-build-to-python3.patch
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch => 0002-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0010-fix-cross-compilation-on-i586-targets.patch => 0003-fix-cross-compilation-on-i586-targets.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-do-not-create-python-environment.patch => 0004-do-not-create-python-environment.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0002-fix-cannot-find-link.patch => 0005-fix-cannot-find-link.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0003-workaround-autoconf-2.13-detection-failed.patch => 0006-workaround-autoconf-2.13-detection-failed.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0005-fix-do_compile-failed-on-mips.patch => 0007-fix-do_compile-failed-on-mips.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{add-riscv-support.patch => 0008-add-riscv-support.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-mozjs-fix-coredump-caused-by-getenv.patch => 0009-mozjs-fix-coredump-caused-by-getenv.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{format-overflow.patch => 0010-format-overflow.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-To-fix-build-error-on-arm32BE.patch => 0011-To-fix-build-error-on-arm32BE.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{JS_PUBLIC_API.patch => 0012-JS_PUBLIC_API.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-riscv-Disable-atomic-operations.patch => 0013-riscv-Disable-atomic-operations.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{fallback-to-2011-C++-standard.patch => 0014-fallback-to-2011-C++-standard.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{ => mipsarchn32}/0001-fix-compiling-failure-on-mips64-n32-bsp.patch (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0006-support-musl.patch => musl/0001-support-musl.patch} (100%)
>   rename meta-oe/recipes-extended/mozjs/mozjs/{0001-js-Fix-build-with-musl.patch => musl/0002-js-Fix-build-with-musl.patch} (100%)
> 
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-Port-build-to-python3.patch b/meta-oe/recipes-extended/mozjs/mozjs/0001-Port-build-to-python3.patch
> new file mode 100644
> index 000000000..695dd97f6
> --- /dev/null
> +++ b/meta-oe/recipes-extended/mozjs/mozjs/0001-Port-build-to-python3.patch
> @@ -0,0 +1,6888 @@
> +From 33a373ba41d978af60c2f0230bcba6ad27357ec8 Mon Sep 17 00:00:00 2001
> +From: =?UTF-8?q?Andreas=20M=C3=BCller?= <schnitzeltony at gmail.com>
> +Date: Wed, 29 Jan 2020 16:25:11 +0100
> +Subject: [PATCH] Port build to python3
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +* first tool of choice was 2to3
> +* some parts were taken from [1] but during work it was found that this patch
> +  introduces interesting effects - see hash functions. Working more on this
> +  makes me guess that one has never worked...
> +* Few parts were taken from upstream mirror [2]. Since they use six for porting
> +  to python3 it adds us a new dependency.
> +* To get a better overview what is going on or failing some additional messages
> +  were added. The most verbose one is left disabled - see
> +  python/mozbuild/mozbuild/configure/__init__.py / Line 310 onwards
> +* major changes upstream on build are not to expect so upgrading should cause
> +  little trouble and changes can be tracked by [3]
> +* some solutions are workarounds/hacks so this patch will not be accepeted
> +  upstream. This should not be a probelme for us: once mozjs >= 68 will arrive
> +  we have to go to rust/cargo based build anyway.
> +
> +[1] https://code.foxkit.us/adelie/packages/blob/f2b5773da19ab397fbe64fd32dacc383cfe4cd77/user/mozjs/python3.patch
> +[2] https://github.com/mozilla/gecko-dev
> +[3] https://github.com/mozilla/gecko-dev/tree/esr60
> +
> +Upstream-Status: Inaproppriate [Some Hacks]
> +
> +Signed-off-by: Andreas Müller <schnitzeltony at gmail.com>
> +---
> + build/autoconf/config.status.m4               |   2 +-
> + build/moz.configure/android-ndk.configure     |   4 +-
> + build/moz.configure/checks.configure          |   4 +-
> + build/moz.configure/init.configure            |  31 +-
> + build/moz.configure/keyfiles.configure        |   4 +-
> + build/moz.configure/old.configure             |  32 +-
> + build/moz.configure/toolchain.configure       |  16 +-
> + build/moz.configure/util.configure            |   9 +-
> + build/moz.configure/windows.configure         |  10 +-
> + build/templates.mozbuild                      |   2 +-
> + config/MozZipFile.py                          |  12 +-
> + config/expandlibs.py                          |   6 +-
> + config/expandlibs_exec.py                     |  14 +-
> + config/expandlibs_gen.py                      |   4 +-
> + configure.py                                  |  42 +-
> + js/src/build/moz.build                        |   8 +-
> + js/src/builtin/embedjs.py                     |  10 +-
> + js/src/configure                              |   2 +-
> + js/src/frontend/GenerateReservedWords.py      |   6 +-
> + js/src/gc/GenerateStatsPhases.py              |   4 +-
> + js/src/old-configure.in                       |   2 +
> + memory/build/moz.build                        |   8 +-
> + mozglue/build/moz.build                       |  22 +-
> + .../mozbuild/mozbuild/action/check_binary.py  |   2 +
> + .../mozbuild/action/process_define_files.py   |   4 +-
> + python/mozbuild/mozbuild/backend/base.py      |   8 +-
> + python/mozbuild/mozbuild/backend/common.py    |   8 +-
> + .../mozbuild/backend/configenvironment.py     |  14 +-
> + .../mozbuild/mozbuild/backend/fastermake.py   |  10 +-
> + .../mozbuild/backend/recursivemake.py         | 181 +++----
> + python/mozbuild/mozbuild/config_status.py     |   7 +-
> + .../mozbuild/mozbuild/configure/__init__.py   |  83 +++-
> + .../mozbuild/configure/check_debug_ranges.py  |   6 +-
> + python/mozbuild/mozbuild/configure/options.py |  24 +-
> + python/mozbuild/mozbuild/configure/util.py    |  12 +-
> + .../mozbuild/mozbuild/controller/building.py  |  16 +-
> + python/mozbuild/mozbuild/frontend/context.py  |  89 ++--
> + python/mozbuild/mozbuild/frontend/data.py     |   8 +-
> + python/mozbuild/mozbuild/frontend/emitter.py  |  50 +-
> + python/mozbuild/mozbuild/frontend/reader.py   |  49 +-
> + python/mozbuild/mozbuild/frontend/sandbox.py  |   3 +-
> + python/mozbuild/mozbuild/jar.py               |  12 +-
> + python/mozbuild/mozbuild/makeutil.py          |  24 +-
> + python/mozbuild/mozbuild/mozinfo.py           |   8 +-
> + python/mozbuild/mozbuild/preprocessor.py      |  27 +-
> + python/mozbuild/mozbuild/shellutil.py         |   6 +-
> + .../test/backend/test_recursivemake.py        |  18 +-
> + .../mozbuild/test/configure/common.py         |   8 +-
> + .../mozbuild/mozbuild/test/configure/lint.py  |   8 +-
> + .../test/configure/test_checks_configure.py   |   8 +-
> + .../test/configure/test_compile_checks.py     |   4 +-
> + .../mozbuild/test/configure/test_configure.py | 244 +++++-----
> + .../mozbuild/test/configure/test_lint.py      |  24 +-
> + .../test/configure/test_moz_configure.py      |  32 +-
> + .../mozbuild/test/configure/test_options.py   | 450 +++++++++---------
> + .../configure/test_toolchain_configure.py     |  22 +-
> + .../test/configure/test_toolchain_helpers.py  |  62 +--
> + .../configure/test_toolkit_moz_configure.py   |   2 +-
> + .../mozbuild/test/configure/test_util.py      |   8 +-
> + python/mozbuild/mozbuild/testing.py           |  10 +-
> + python/mozbuild/mozbuild/util.py              |  79 ++-
> + python/mozbuild/mozbuild/virtualenv.py        |   6 +-
> + python/mozbuild/mozpack/chrome/manifest.py    |   6 +-
> + python/mozbuild/mozpack/copier.py             |  12 +-
> + python/mozbuild/mozpack/files.py              |  22 +-
> + python/mozbuild/mozpack/manifests.py          |  16 +-
> + python/mozbuild/mozpack/mozjar.py             |  37 +-
> + .../manifestparser/manifestparser/ini.py      |  13 +-
> + .../manifestparser/manifestparser.py          |  24 +-
> + testing/mozbase/mozinfo/mozinfo/mozinfo.py    |  26 +-
> + .../mozprocess/mozprocess/processhandler.py   |  10 +-
> + third_party/python/which/which.py             |  18 +-
> + 72 files changed, 1081 insertions(+), 993 deletions(-)
> +
> +diff --git a/build/autoconf/config.status.m4 b/build/autoconf/config.status.m4
> +index c75575386..543c2d682 100644
> +--- a/build/autoconf/config.status.m4
> ++++ b/build/autoconf/config.status.m4
> +@@ -122,7 +122,7 @@ trap 'rm -f $CONFIG_STATUS conftest*; exit 1' 1 2 15
> +
> + dnl We're going to need [ ] for python syntax.
> + changequote(<<<, >>>)dnl
> +-echo creating $CONFIG_STATUS
> ++echo creating $CONFIG_STATUS in `pwd`
> +
> + cat > $CONFIG_STATUS <<EOF
> +
> +diff --git a/build/moz.configure/android-ndk.configure b/build/moz.configure/android-ndk.configure
> +index 1067b8619..3b592a237 100644
> +--- a/build/moz.configure/android-ndk.configure
> ++++ b/build/moz.configure/android-ndk.configure
> +@@ -30,7 +30,7 @@ js_option('--with-android-version',
> +
> +
> + @depends('--with-android-version', min_android_version, '--help')
> +- at imports(_from='__builtin__', _import='ValueError')
> ++ at imports(_from='builtins', _import='ValueError')
> + def android_version(value, min_version, _):
> +     if not value:
> +         # Someone has passed --without-android-version.
> +@@ -68,7 +68,7 @@ add_old_configure_assignment('android_ndk', ndk)
> +
> + @depends(ndk)
> + @checking('for android ndk version')
> +- at imports(_from='__builtin__', _import='open')
> ++ at imports(_from='builtins', _import='open')
> + def ndk_version(ndk):
> +     if not ndk:
> +         # Building 'js/src' for non-Android.
> +diff --git a/build/moz.configure/checks.configure b/build/moz.configure/checks.configure
> +index 516652da9..11e1091c6 100644
> +--- a/build/moz.configure/checks.configure
> ++++ b/build/moz.configure/checks.configure
> +@@ -14,7 +14,7 @@
> +
> +
> + @template
> +- at imports(_from='__builtin__', _import='Exception')
> ++ at imports(_from='builtins', _import='Exception')
> + def _declare_exceptions():
> +     class FatalCheckError(Exception):
> +         '''An exception to throw from a function decorated with @checking.
> +@@ -57,7 +57,7 @@ def checking(what, callback=None):
> +                 try:
> +                     ret = func(*args, **kwargs)
> +                 except FatalCheckError as e:
> +-                    error = e.message
> ++                    error = str(e)
> +                 display_ret = callback(ret) if callback else ret
> +                 if display_ret is True:
> +                     log.info('yes')
> +diff --git a/build/moz.configure/init.configure b/build/moz.configure/init.configure
> +index 648ac2ded..4d74547d8 100644
> +--- a/build/moz.configure/init.configure
> ++++ b/build/moz.configure/init.configure
> +@@ -14,7 +14,7 @@ option(env='DIST', nargs=1, help='DIST directory')
> +
> +
> + @depends('--help', 'DIST')
> +- at imports(_from='__builtin__', _import='open')
> ++ at imports(_from='builtins', _import='open')
> + @imports(_from='os.path', _import='exists')
> + def check_build_environment(help, dist):
> +     topobjdir = os.path.realpath(os.path.abspath('.'))
> +@@ -65,7 +65,7 @@ def check_build_environment(help, dist):
> +     # Check for CRLF line endings.
> +     with open(os.path.join(topsrcdir, 'configure.py'), 'rb') as fh:
> +         data = fh.read()
> +-        if '\r' in data:
> ++        if b'\r' in data:
> +             die('\n ***\n'
> +                 ' * The source tree appears to have Windows-style line endings.\n'
> +                 ' *\n'
> +@@ -269,7 +269,7 @@ def early_options():
> +     def early_options():
> +         return set(
> +             option.env
> +-            for option in __sandbox__._options.itervalues()
> ++            for option in __sandbox__._options.values()
> +             if option.env
> +         )
> +     return early_options
> +@@ -307,15 +307,15 @@ def mozconfig_options(mozconfig, automation, help):
> +                 log.info('  %s' % arg)
> +                 helper.add(arg, origin='mozconfig', args=helper._args)
> +
> +-        for key, value in mozconfig['env']['added'].iteritems():
> ++        for key, value in mozconfig['env']['added'].items():
> +             add(key, value)
> +             os.environ[key] = value
> +-        for key, (_, value) in mozconfig['env']['modified'].iteritems():
> ++        for key, (_, value) in mozconfig['env']['modified'].items():
> +             add(key, value)
> +             os.environ[key] = value
> +-        for key, value in mozconfig['vars']['added'].iteritems():
> ++        for key, value in mozconfig['vars']['added'].items():
> +             add(key, value)
> +-        for key, (_, value) in mozconfig['vars']['modified'].iteritems():
> ++        for key, (_, value) in mozconfig['vars']['modified'].items():
> +             add(key, value)
> +
> +
> +@@ -353,7 +353,7 @@ option(env='PYTHON3', nargs=1, help='Python 3 interpreter (3.5 or later)')
> + @depends('PYTHON3')
> + @checking('for Python 3',
> +           callback=lambda x: '%s (%s)' % (x.path, x.str_version) if x else 'no')
> +- at imports(_from='__builtin__', _import='Exception')
> ++ at imports(_from='builtins', _import='Exception')
> + @imports(_from='mozbuild.pythonutil', _import='find_python3_executable')
> + @imports(_from='mozbuild.pythonutil', _import='python_executable_version')
> + def python3(env_python):
> +@@ -377,9 +377,6 @@ def python3(env_python):
> +         if not python:
> +             return None
> +
> +-        # The API returns a bytes whereas everything in configure is unicode.
> +-        python = python.decode('utf-8')
> +-
> +     return namespace(
> +         path=python,
> +         version=version,
> +@@ -481,6 +478,8 @@ def hg_config(build_env, hg, version):
> + @imports('re')
> + def git_version(git):
> +     out = check_cmd_output(git, '--version').rstrip()
> ++    if isinstance(out, bytes):
> ++        out = out.decode('utf-8')
> +
> +     match = re.search('git version (.*)$', out)
> +
> +@@ -551,8 +550,8 @@ option('--target', nargs=1,
> + @imports(_from='mozbuild.configure.constants', _import='Endianness')
> + @imports(_from='mozbuild.configure.constants', _import='Kernel')
> + @imports(_from='mozbuild.configure.constants', _import='OS')
> +- at imports(_from='__builtin__', _import='KeyError')
> +- at imports(_from='__builtin__', _import='ValueError')
> ++ at imports(_from='builtins', _import='KeyError')
> ++ at imports(_from='builtins', _import='ValueError')
> + def split_triplet(triplet, allow_unknown=False):
> +     # The standard triplet is defined as
> +     #   CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
> +@@ -562,6 +561,8 @@ def split_triplet(triplet, allow_unknown=False):
> +     # Additionally, some may omit "unknown" when the manufacturer
> +     # is not specified and emit
> +     #   CPU_TYPE-OPERATING_SYSTEM
> ++    if isinstance(triplet, bytes):
> ++        triplet = triplet.decode('utf-8')
> +     parts = triplet.split('-', 2)
> +     if len(parts) == 3:
> +         cpu, _, os = parts
> +@@ -987,7 +988,7 @@ add_old_configure_assignment('MOZ_BUILD_APP', build_project)
> + # - otherwise, if we have "a" in GRE_MILESTONE, we're building Nightly or Aurora
> + # - otherwise, we're building Release/Beta (define RELEASE_OR_BETA)
> + @depends(check_build_environment, '--help')
> +- at imports(_from='__builtin__', _import='open')
> ++ at imports(_from='builtins', _import='open')
> + @imports('re')
> + def milestone(build_env, _):
> +     milestone_path = os.path.join(build_env.topsrcdir,
> +@@ -1105,7 +1106,7 @@ def enabled_in_nightly(milestone, _):
> + def all_configure_options():
> +     result = []
> +     previous = None
> +-    for option in __sandbox__._options.itervalues():
> ++    for option in __sandbox__._options.values():
> +         # __sandbox__._options contains items for both option.name and
> +         # option.env. But it's also an OrderedDict, meaning both are
> +         # consecutive.
> +diff --git a/build/moz.configure/keyfiles.configure b/build/moz.configure/keyfiles.configure
> +index 5d51cccea..14a35a3c6 100644
> +--- a/build/moz.configure/keyfiles.configure
> ++++ b/build/moz.configure/keyfiles.configure
> +@@ -16,8 +16,8 @@ def keyfile(desc, default=None, help=None, callback=lambda x: x):
> +
> +     @depends('--with-%s-keyfile' % name)
> +     @checking('for the %s key' % desc, lambda x: x and x is not no_key)
> +-    @imports(_from='__builtin__', _import='open')
> +-    @imports(_from='__builtin__', _import='IOError')
> ++    @imports(_from='builtins', _import='open')
> ++    @imports(_from='builtins', _import='IOError')
> +     def keyfile(value):
> +         if value:
> +             try:
> +diff --git a/build/moz.configure/old.configure b/build/moz.configure/old.configure
> +index 81c10b91f..29b496bae 100644
> +--- a/build/moz.configure/old.configure
> ++++ b/build/moz.configure/old.configure
> +@@ -64,9 +64,9 @@ set_config('AUTOCONF', autoconf)
> +
> + @depends('OLD_CONFIGURE', mozconfig, autoconf, check_build_environment, shell,
> +          old_configure_assignments, build_project)
> +- at imports(_from='__builtin__', _import='open')
> +- at imports(_from='__builtin__', _import='print')
> +- at imports(_from='__builtin__', _import='sorted')
> ++ at imports(_from='builtins', _import='open')
> ++ at imports(_from='builtins', _import='print')
> ++ at imports(_from='builtins', _import='sorted')
> + @imports('glob')
> + @imports('itertools')
> + @imports('subprocess')
> +@@ -113,7 +113,7 @@ def prepare_configure(old_configure, mozconfig, autoconf, build_env, shell,
> +
> +         # Make old-configure append to config.log, where we put our own log.
> +         # This could be done with a m4 macro, but it's way easier this way
> +-        script = script.replace('>./config.log', '>>./config.log')
> ++        script = script.replace(b'>./config.log', b'>>./config.log')
> +
> +         with open(old_configure, 'wb') as fh:
> +             fh.write(script)
> +@@ -282,8 +282,8 @@ def old_configure_options(*options):
> +     '--x-includes',
> +     '--x-libraries',
> + )
> +- at imports(_from='__builtin__', _import='compile')
> +- at imports(_from='__builtin__', _import='open')
> ++ at imports(_from='builtins', _import='compile')
> ++ at imports(_from='builtins', _import='open')
> + @imports('logging')
> + @imports('os')
> + @imports('subprocess')
> +@@ -326,7 +326,7 @@ def old_configure(prepare_configure, extra_old_configure_args, all_options,
> +     log.debug('Running %s', quote(*cmd))
> +     if extra_env:
> +         log.debug('with extra environment: %s',
> +-                  ' '.join('%s=%s' % pair for pair in extra_env.iteritems()))
> ++                  ' '.join('%s=%s' % pair for pair in extra_env.items()))
> +
> +     # Our logging goes to config.log, the same file old.configure uses.
> +     # We can't share the handle on the file, so close it. We assume nothing
> +@@ -359,7 +359,7 @@ def old_configure(prepare_configure, extra_old_configure_args, all_options,
> +         # Every variation of the exec() function I tried led to:
> +         # SyntaxError: unqualified exec is not allowed in function 'main' it
> +         # contains a nested function with free variables
> +-        exec code in raw_config # noqa
> ++        exec(code, raw_config) # noqa
> +
> +     # Ensure all the flags known to old-configure appear in the
> +     # @old_configure_options above.
> +@@ -393,16 +393,24 @@ def set_old_configure_define(name, value):
> + @depends(old_configure)
> + @imports('types')
> + def post_old_configure(raw_config):
> ++    log.info('post_old_configure started')
> ++
> +     for k, v in raw_config['substs']:
> +         set_old_configure_config(
> +-            k[1:-1], v[1:-1] if isinstance(v, types.StringTypes) else v)
> ++            k[1:-1], v[1:-1] if isinstance(v, str) else v)
> ++
> ++    log.info('post_old_configure 1 finished')
> +
> +-    for k, v in dict(raw_config['defines']).iteritems():
> ++    for k, v in dict(raw_config['defines']).items():
> +         set_old_configure_define(k[1:-1], v[1:-1])
> +
> ++    log.info('post_old_configure 2 finished')
> ++
> +     set_old_configure_config('non_global_defines',
> +                              raw_config['non_global_defines'])
> +
> ++    log.info('post_old_configure 3 finished')
> ++
> +
> + # Assuming no other option is declared after this function, handle the
> + # env options that were injected by mozconfig_options by creating dummy
> +@@ -414,6 +422,7 @@ def post_old_configure(raw_config):
> + @imports('__sandbox__')
> + @imports(_from='mozbuild.configure.options', _import='Option')
> + def remaining_mozconfig_options(_):
> ++    log.info('remaining_mozconfig_options started')
> +     helper = __sandbox__._helper
> +     for arg in helper:
> +         if helper._origins[arg] != 'mozconfig':
> +@@ -422,5 +431,6 @@ def remaining_mozconfig_options(_):
> +         if name.isupper() and name not in __sandbox__._options:
> +             option = Option(env=name, nargs='*', help=name)
> +             helper.handle(option)
> ++    log.info('remaining_mozconfig_options finished')
> +
> + # Please do not add anything after remaining_mozconfig_options()
> +diff --git a/build/moz.configure/toolchain.configure b/build/moz.configure/toolchain.configure
> +index fc640c75e..c5508dfb7 100755
> +--- a/build/moz.configure/toolchain.configure
> ++++ b/build/moz.configure/toolchain.configure
> +@@ -391,7 +391,7 @@ def get_compiler_info(compiler, language):
> +         ('CPU', CPU_preprocessor_checks),
> +         ('KERNEL', kernel_preprocessor_checks),
> +     ):
> +-        for n, (value, condition) in enumerate(preprocessor_checks.iteritems()):
> ++        for n, (value, condition) in enumerate(preprocessor_checks.items()):
> +             check += dedent('''\
> +                 #%(if)s %(condition)s
> +                 %%%(name)s "%(value)s"
> +@@ -425,9 +425,9 @@ def get_compiler_info(compiler, language):
> +     data = {}
> +     for line in result.splitlines():
> +         if line.startswith(b'%'):
> +-            k, _, v = line.partition(' ')
> +-            k = k.lstrip('%')
> +-            data[k] = v.replace(' ', '').lstrip('"').rstrip('"')
> ++            k, _, v = line.partition(b' ')
> ++            k = k.lstrip(b'%').decode('utf-8')
> ++            data[k] = v.replace(b' ', b'').lstrip(b'"').rstrip(b'"').decode('utf-8')
> +             log.debug('%s = %s', k, data[k])
> +
> +     try:
> +@@ -551,7 +551,7 @@ def check_compiler(compiler, language, target):
> +     )
> +
> +
> +- at imports(_from='__builtin__', _import='open')
> ++ at imports(_from='builtins', _import='open')
> + @imports('json')
> + @imports('subprocess')
> + @imports('sys')
> +@@ -606,7 +606,7 @@ def vs_major_version(value):
> +
> +
> + @depends(host, target, vs_major_version, check_build_environment, '--with-visual-studio-version')
> +- at imports(_from='__builtin__', _import='sorted')
> ++ at imports(_from='builtins', _import='sorted')
> + @imports(_from='operator', _import='itemgetter')
> + @imports('platform')
> + def vc_compiler_path(host, target, vs_major_version, env, vs_release_name):
> +@@ -807,7 +807,7 @@ def compiler(language, host_or_target, c_compiler=None, other_compiler=None,
> +                     target.os != 'Android':
> +                 return namespace(**{
> +                     k: [] if k == 'flags' else v
> +-                    for k, v in other_compiler.__dict__.iteritems()
> ++                    for k, v in other_compiler.__dict__.items()
> +                 })
> +
> +     # Normally, we'd use `var` instead of `_var`, but the interaction with
> +@@ -1238,7 +1238,7 @@ set_config('VISIBILITY_FLAGS', visibility_flags)
> +
> + @depends(c_compiler)
> + @imports('multiprocessing')
> +- at imports(_from='__builtin__', _import='min')
> ++ at imports(_from='builtins', _import='min')
> + def pgo_flags(compiler):
> +     if compiler.type in ('gcc', 'clang'):
> +         return namespace(
> +diff --git a/build/moz.configure/util.configure b/build/moz.configure/util.configure
> +index 3284fd8b5..218813e2d 100644
> +--- a/build/moz.configure/util.configure
> ++++ b/build/moz.configure/util.configure
> +@@ -25,7 +25,6 @@ def configure_error(message):
> + # does not.
> +
> +
> +- at imports(_from='__builtin__', _import='unicode')
> + @imports('subprocess')
> + @imports('sys')
> + @imports(_from='mozbuild.configure.util', _import='LineIO')
> +@@ -39,10 +38,10 @@ def check_cmd_output(*args, **kwargs):
> +     if 'env' in kwargs:
> +         normalized_env = {}
> +         for k, v in kwargs['env'].items():
> +-            if isinstance(k, unicode):
> ++            if isinstance(k, str):
> +                 k = k.encode('utf-8', 'strict')
> +
> +-            if isinstance(v, unicode):
> ++            if isinstance(v, str):
> +                 v = v.encode('utf-8', 'strict')
> +
> +             normalized_env[k] = v
> +@@ -285,7 +284,7 @@ def unique_list(l):
> + #     ('19.0', 'x64', r'C:\...\amd64\cl.exe')
> + #     ('19.0', 'x86', r'C:\...\amd64_x86\cl.exe')
> + @imports(_import='_winreg', _as='winreg')
> +- at imports(_from='__builtin__', _import='WindowsError')
> ++ at imports(_from='builtins', _import='WindowsError')
> + @imports(_from='fnmatch', _import='fnmatch')
> + def get_registry_values(pattern, get_32_and_64_bit=False):
> +     def enum_helper(func, key):
> +@@ -360,6 +359,8 @@ def get_registry_values(pattern, get_32_and_64_bit=False):
> + @imports(_from='mozbuild.configure.util', _import='Version', _as='_Version')
> + def Version(v):
> +     'A version number that can be compared usefully.'
> ++    if isinstance(v, bytes):
> ++        v = v.decode('utf-8')
> +     return _Version(v)
> +
> + # Denotes a deprecated option. Combines option() and @depends:
> +diff --git a/build/moz.configure/windows.configure b/build/moz.configure/windows.configure
> +index a5b790e3b..2b88fc447 100644
> +--- a/build/moz.configure/windows.configure
> ++++ b/build/moz.configure/windows.configure
> +@@ -10,7 +10,7 @@ option('--with-windows-version', nargs=1, default='603',
> +
> +
> + @depends('--with-windows-version')
> +- at imports(_from='__builtin__', _import='ValueError')
> ++ at imports(_from='builtins', _import='ValueError')
> + def valid_windows_version(value):
> +     if not value:
> +         die('Cannot build with --without-windows-version')
> +@@ -50,8 +50,8 @@ def windows_sdk_dir(value, host):
> +
> + @imports('os')
> + @imports('re')
> +- at imports(_from='__builtin__', _import='sorted')
> +- at imports(_from='__builtin__', _import='WindowsError')
> ++ at imports(_from='builtins', _import='sorted')
> ++ at imports(_from='builtins', _import='WindowsError')
> + def get_sdk_dirs(sdk, subdir):
> +     def get_dirs_containing(sdk, stem, subdir):
> +         base = os.path.join(sdk, stem)
> +@@ -96,7 +96,7 @@ def valid_windows_sdk_dir_result(value):
> +
> + @depends(c_compiler, windows_sdk_dir, valid_windows_version, 'WINDOWSSDKDIR')
> + @checking('for Windows SDK', valid_windows_sdk_dir_result)
> +- at imports(_from='__builtin__', _import='sorted')
> ++ at imports(_from='builtins', _import='sorted')
> + @imports(_from='textwrap', _import='dedent')
> + def valid_windows_sdk_dir(compiler, windows_sdk_dir, target_version,
> +                           windows_sdk_dir_env):
> +@@ -174,7 +174,7 @@ def valid_ucrt_sdk_dir_result(value):
> + @depends(windows_sdk_dir, 'WINDOWSSDKDIR', c_compiler)
> + @checking('for Universal CRT SDK', valid_ucrt_sdk_dir_result)
> + @imports('os')
> +- at imports(_from='__builtin__', _import='sorted')
> ++ at imports(_from='builtins', _import='sorted')
> + @imports(_import='mozpack.path', _as='mozpath')
> + def valid_ucrt_sdk_dir(windows_sdk_dir, windows_sdk_dir_env, c_compiler):
> +     if windows_sdk_dir_env:
> +diff --git a/build/templates.mozbuild b/build/templates.mozbuild
> +index 3da850ce5..ae5e410fe 100644
> +--- a/build/templates.mozbuild
> ++++ b/build/templates.mozbuild
> +@@ -10,7 +10,7 @@ def Binary():
> +     templates.'''
> +
> +     # Add -llog by default, since we use it all over the place.
> +-    if CONFIG['OS_TARGET'] == 'Android':
> ++    if str(CONFIG['OS_TARGET']) == 'Android':
> +         OS_LIBS += ['log']
> +
> +
> +diff --git a/config/MozZipFile.py b/config/MozZipFile.py
> +index 337fe0521..dc7add4c3 100644
> +--- a/config/MozZipFile.py
> ++++ b/config/MozZipFile.py
> +@@ -18,7 +18,7 @@ class ZipFile(zipfile.ZipFile):
> +   def __init__(self, file, mode="r", compression=zipfile.ZIP_STORED,
> +                lock = False):
> +     if lock:
> +-      assert isinstance(file, basestring)
> ++      assert isinstance(file, str)
> +       self.lockfile = lock_file(file + '.lck')
> +     else:
> +       self.lockfile = None
> +@@ -46,7 +46,7 @@ class ZipFile(zipfile.ZipFile):
> +                               date_time=time.localtime(time.time()))
> +       zinfo.compress_type = self.compression
> +       # Add some standard UNIX file access permissions (-rw-r--r--).
> +-      zinfo.external_attr = (0x81a4 & 0xFFFF) << 16L
> ++      zinfo.external_attr = (0x81a4 & 0xFFFF) << 16
> +     else:
> +       zinfo = zinfo_or_arcname
> +
> +@@ -58,7 +58,7 @@ class ZipFile(zipfile.ZipFile):
> +     # as the old, reuse the existing entry.
> +
> +     doSeek = False # store if we need to seek to the eof after overwriting
> +-    if self.NameToInfo.has_key(zinfo.filename):
> ++    if zinfo.filename in self.NameToInfo:
> +       # Find the last ZipInfo with our name.
> +       # Last, because that's catching multiple overwrites
> +       i = len(self.filelist)
> +@@ -109,14 +109,14 @@ class ZipFile(zipfile.ZipFile):
> +       # adjust file mode if we originally just wrote, now we rewrite
> +       self.fp.close()
> +       self.fp = open(self.filename, 'r+b')
> +-    all = map(lambda zi: (zi, True), self.filelist) + \
> +-        map(lambda zi: (zi, False), self._remove)
> ++    all = [(zi, True) for zi in self.filelist] + \
> ++        [(zi, False) for zi in self._remove]
> +     all.sort(lambda l, r: cmp(l[0].header_offset, r[0].header_offset))
> +     # empty _remove for multiple closes
> +     self._remove = []
> +
> +     lengths = [all[i+1][0].header_offset - all[i][0].header_offset
> +-               for i in xrange(len(all)-1)]
> ++               for i in range(len(all)-1)]
> +     lengths.append(self.end - all[-1][0].header_offset)
> +     to_pos = 0
> +     for (zi, keep), length in zip(all, lengths):
> +diff --git a/config/expandlibs.py b/config/expandlibs.py
> +index ac06c432f..df1fed15d 100644
> +--- a/config/expandlibs.py
> ++++ b/config/expandlibs.py
> +@@ -26,7 +26,7 @@ ${LIB_PREFIX}${ROOT}.${LIB_SUFFIX} following these rules:
> +   descriptor contains. And for each of these LIBS, also apply the same
> +   rules.
> + '''
> +-from __future__ import with_statement
> ++
> + import sys, os, errno
> + import expandlibs_config as conf
> +
> +@@ -36,7 +36,7 @@ def ensureParentDir(file):
> +     if dir and not os.path.exists(dir):
> +         try:
> +             os.makedirs(dir)
> +-        except OSError, error:
> ++        except OSError as error:
> +             if error.errno != errno.EEXIST:
> +                 raise
> +
> +@@ -140,4 +140,4 @@ class ExpandArgs(list):
> +         return [relativize(arg)]
> +
> + if __name__ == '__main__':
> +-    print " ".join(ExpandArgs(sys.argv[1:]))
> ++    print(" ".join(ExpandArgs(sys.argv[1:])))
> +diff --git a/config/expandlibs_exec.py b/config/expandlibs_exec.py
> +index df656016c..fb786a6a8 100644
> +--- a/config/expandlibs_exec.py
> ++++ b/config/expandlibs_exec.py
> +@@ -20,7 +20,7 @@ With the --symbol-order argument, followed by a file name, it will add the
> + relevant linker options to change the order in which the linker puts the
> + symbols appear in the resulting binary. Only works for ELF targets.
> + '''
> +-from __future__ import with_statement
> ++
> + import sys
> + import os
> + from expandlibs import (
> +@@ -304,11 +304,11 @@ class SectionFinder(object):
> +         return syms
> +
> + def print_command(out, args):
> +-    print >>out, "Executing: " + " ".join(args)
> ++    print("Executing: " + " ".join(args), file=out)
> +     for tmp in [f for f in args.tmp if os.path.isfile(f)]:
> +-        print >>out, tmp + ":"
> ++        print(tmp + ":", file=out)
> +         with open(tmp) as file:
> +-            print >>out, "".join(["    " + l for l in file.readlines()])
> ++            print("".join(["    " + l for l in file.readlines()]), file=out)
> +     out.flush()
> +
> + def main(args, proc_callback=None):
> +@@ -338,13 +338,13 @@ def main(args, proc_callback=None):
> +             proc = subprocess.Popen(args, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
> +             if proc_callback:
> +                 proc_callback(proc)
> +-        except Exception, e:
> +-            print >>sys.stderr, 'error: Launching', args, ':', e
> ++        except Exception as e:
> ++            print('error: Launching', args, ':', e, file=sys.stderr)
> +             raise e
> +         (stdout, stderr) = proc.communicate()
> +         if proc.returncode and not options.verbose:
> +             print_command(sys.stderr, args)
> +-        sys.stderr.write(stdout)
> ++        sys.stderr.write(stdout.decode("utf-8"))
> +         sys.stderr.flush()
> +         if proc.returncode:
> +             return proc.returncode
> +diff --git a/config/expandlibs_gen.py b/config/expandlibs_gen.py
> +index b1de63cd0..dc62bd184 100644
> +--- a/config/expandlibs_gen.py
> ++++ b/config/expandlibs_gen.py
> +@@ -5,7 +5,7 @@
> + '''Given a list of object files and library names, prints a library
> + descriptor to standard output'''
> +
> +-from __future__ import with_statement
> ++
> + import sys
> + import os
> + import expandlibs_config as conf
> +@@ -38,4 +38,4 @@ if __name__ == '__main__':
> +
> +     ensureParentDir(options.output)
> +     with open(options.output, 'w') as outfile:
> +-        print >>outfile, generate(args)
> ++        print(generate(args), file=outfile)
> +diff --git a/configure.py b/configure.py
> +index 771e34e38..bee329d7c 100644
> +--- a/configure.py
> ++++ b/configure.py
> +@@ -2,10 +2,11 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import print_function, unicode_literals
> ++
> +
> + import codecs
> + import itertools
> ++import logging
> + import os
> + import sys
> + import textwrap
> +@@ -34,7 +35,9 @@ from mozbuild.util import (
> + def main(argv):
> +     config = {}
> +     sandbox = ConfigureSandbox(config, os.environ, argv)
> ++    print('sandbox.run started')
> +     sandbox.run(os.path.join(os.path.dirname(__file__), 'moz.configure'))
> ++    print('sandbox.run finished')
> +
> +     if sandbox._help:
> +         return 0
> +@@ -56,12 +59,21 @@ def config_status(config):
> +
> +     sanitized_config = {}
> +     sanitized_config['substs'] = {
> +-        k: sanitized_bools(v) for k, v in config.iteritems()
> ++        k: sanitized_bools(v) for k, v in config.items()
> +         if k not in ('DEFINES', 'non_global_defines', 'TOPSRCDIR', 'TOPOBJDIR',
> +                      'ALL_CONFIGURE_PATHS')
> +     }
> ++
> ++    # Hack around OptionValue entries unknown during compile
> ++    for opt in ('BUILD_BACKENDS', 'MOZ_UI_LOCALE', 'RUSTFLAGS' ):
> ++        old = sanitized_config['substs'][opt]
> ++        new = []
> ++        for setting in old:
> ++            new.append(setting)
> ++        sanitized_config['substs'][opt] = new
> ++
> +     sanitized_config['defines'] = {
> +-        k: sanitized_bools(v) for k, v in config['DEFINES'].iteritems()
> ++        k: sanitized_bools(v) for k, v in config['DEFINES'].items()
> +     }
> +     sanitized_config['non_global_defines'] = config['non_global_defines']
> +     sanitized_config['topsrcdir'] = config['TOPSRCDIR']
> +@@ -71,20 +83,17 @@ def config_status(config):
> +     # Create config.status. Eventually, we'll want to just do the work it does
> +     # here, when we're able to skip configure tests/use cached results/not rely
> +     # on autoconf.
> +-    print("Creating config.status", file=sys.stderr)
> +-    encoding = 'mbcs' if sys.platform == 'win32' else 'utf-8'
> +-    with codecs.open('config.status', 'w', encoding) as fh:
> ++    logging.getLogger('moz.configure').info('Creating config.status')
> ++    with codecs.open('config.status', 'w', 'utf-8') as fh:
> +         fh.write(textwrap.dedent('''\
> +             #!%(python)s
> +-            # coding=%(encoding)s
> +-            from __future__ import unicode_literals
> +-            from mozbuild.util import encode
> +-            encoding = '%(encoding)s'
> +-        ''') % {'python': config['PYTHON'], 'encoding': encoding})
> ++            # coding=utf-8
> ++            print("config.status started")
> ++        ''') % {'python': config['PYTHON']})
> +         # A lot of the build backend code is currently expecting byte
> +         # strings and breaks in subtle ways with unicode strings. (bug 1296508)
> +-        for k, v in sanitized_config.iteritems():
> +-            fh.write('%s = encode(%s, encoding)\n' % (k, indented_repr(v)))
> ++        for k, v in sanitized_config.items():
> ++            fh.write('%s = %s\n' % (k, indented_repr(v)))
> +         fh.write("__all__ = ['topobjdir', 'topsrcdir', 'defines', "
> +                  "'non_global_defines', 'substs', 'mozconfig']")
> +
> +@@ -97,6 +106,9 @@ def config_status(config):
> +                     args = dict([(name, globals()[name]) for name in __all__])
> +                     config_status(**args)
> +             '''))
> ++        fh.write(textwrap.dedent('''
> ++            print("config.status finished")
> ++        '''))
> +
> +     partial_config = PartialConfigEnvironment(config['TOPOBJDIR'])
> +     partial_config.write_vars(sanitized_config)
> +@@ -116,7 +128,7 @@ def config_status(config):
> +     # executable permissions.
> +     os.chmod('config.status', 0o755)
> +     if config.get('MOZ_BUILD_APP') != 'js' or config.get('JS_STANDALONE'):
> +-        os.environ[b'WRITE_MOZINFO'] = b'1'
> ++        os.environ['WRITE_MOZINFO'] = '1'
> +         from mozbuild.config_status import config_status
> +
> +         # Some values in sanitized_config also have more complex types, such as
> +@@ -127,7 +139,7 @@ def config_status(config):
> +
> +         # A lot of the build backend code is currently expecting byte strings
> +         # and breaks in subtle ways with unicode strings.
> +-        return config_status(args=[], **encode(sanitized_config, encoding))
> ++        return config_status(args=[], **sanitized_config)
> +     return 0
> +
> +
> +diff --git a/js/src/build/moz.build b/js/src/build/moz.build
> +index a7f5fa4ce..856cae32d 100644
> +--- a/js/src/build/moz.build
> ++++ b/js/src/build/moz.build
> +@@ -47,22 +47,22 @@ USE_LIBS += [
> +     'zlib',
> + ]
> +
> +-if CONFIG['OS_ARCH'] not in ('WINNT', 'HP-UX'):
> ++if str(CONFIG['OS_ARCH']) not in ('WINNT', 'HP-UX'):
> +     OS_LIBS += [
> +         'm',
> +     ]
> +
> +-if CONFIG['OS_ARCH'] == 'FreeBSD':
> ++if str(CONFIG['OS_ARCH']) == 'FreeBSD':
> +     OS_LIBS += [
> +         '-pthread',
> +     ]
> +
> +-if CONFIG['OS_ARCH'] == 'Linux':
> ++if str(CONFIG['OS_ARCH']) == 'Linux':
> +     OS_LIBS += [
> +         'dl',
> +     ]
> +
> +-if CONFIG['OS_ARCH'] == 'SunOS':
> ++if str(CONFIG['OS_ARCH']) == 'SunOS':
> +     OS_LIBS += [
> +         'posix4',
> +         'dl',
> +diff --git a/js/src/builtin/embedjs.py b/js/src/builtin/embedjs.py
> +index ba25e71c1..d4f2de122 100644
> +--- a/js/src/builtin/embedjs.py
> ++++ b/js/src/builtin/embedjs.py
> +@@ -36,7 +36,7 @@
> + #
> + # It uses the C preprocessor to process its inputs.
> +
> +-from __future__ import with_statement
> ++
> + import re, sys, os, subprocess
> + import shlex
> + import which
> +@@ -52,8 +52,8 @@ def ToCAsciiArray(lines):
> +
> + def ToCArray(lines):
> +   result = []
> +-  for chr in lines:
> +-    result.append(str(ord(chr)))
> ++  for char in lines:
> ++    result.append("0x%0.2X" % char)
> +   return ", ".join(result)
> +
> + HEADER_TEMPLATE = """\
> +@@ -87,7 +87,7 @@ def embed(cxx, preprocessorOption, cppflags, msgs, sources, c_out, js_out, names
> +
> +   js_out.write(processed)
> +   import zlib
> +-  compressed = zlib.compress(processed)
> ++  compressed = zlib.compress(processed.encode('utf-8'))
> +   data = ToCArray(compressed)
> +   c_out.write(HEADER_TEMPLATE % {
> +     'sources_type': 'unsigned char',
> +@@ -107,7 +107,7 @@ def preprocess(cxx, preprocessorOption, source, args = []):
> +   tmpOut = 'self-hosting-preprocessed.pp';
> +   outputArg = shlex.split(preprocessorOption + tmpOut)
> +
> +-  with open(tmpIn, 'wb') as input:
> ++  with open(tmpIn, 'w') as input:
> +     input.write(source)
> +   print(' '.join(cxx + outputArg + args + [tmpIn]))
> +   result = subprocess.Popen(cxx + outputArg + args + [tmpIn]).wait()
> +diff --git a/js/src/configure b/js/src/configure
> +index 3b3a39af3..8f5ea41d0 100755
> +--- a/js/src/configure
> ++++ b/js/src/configure
> +@@ -24,4 +24,4 @@ export OLD_CONFIGURE="$SRCDIR"/old-configure
> +
> + set -- "$@" --enable-project=js
> +
> +-which python2.7 > /dev/null && exec python2.7 "$TOPSRCDIR/configure.py" "$@" || exec python "$TOPSRCDIR/configure.py" "$@"
> ++which python3 > /dev/null && exec python3 "$TOPSRCDIR/configure.py" "$@" || exec python "$TOPSRCDIR/configure.py" "$@"
> +diff --git a/js/src/frontend/GenerateReservedWords.py b/js/src/frontend/GenerateReservedWords.py
> +index 3aa2307b9..381c8e2b4 100644
> +--- a/js/src/frontend/GenerateReservedWords.py
> ++++ b/js/src/frontend/GenerateReservedWords.py
> +@@ -80,14 +80,14 @@ def split_list_per_column(reserved_word_list, column):
> +         per_column = column_dict.setdefault(word[column], [])
> +         per_column.append(item)
> +
> +-    return sorted(column_dict.items(), key=lambda (char, word): ord(char))
> ++    return sorted(list(column_dict.items()), key=lambda char_word: ord(char_word[0]))
> +
> + def generate_letter_switch(opt, unprocessed_columns, reserved_word_list,
> +                            columns=None):
> +     assert(len(reserved_word_list) != 0);
> +
> +     if not columns:
> +-        columns = range(0, unprocessed_columns)
> ++        columns = list(range(0, unprocessed_columns))
> +
> +     if len(reserved_word_list) == 1:
> +         index, word = reserved_word_list[0]
> +@@ -161,7 +161,7 @@ def split_list_per_length(reserved_word_list):
> +         per_length = length_dict.setdefault(len(word), [])
> +         per_length.append(item)
> +
> +-    return sorted(length_dict.items(), key=lambda (length, word): length)
> ++    return sorted(list(length_dict.items()), key=lambda length_word: length_word[0])
> +
> + def generate_switch(opt, reserved_word_list):
> +     assert(len(reserved_word_list) != 0);
> +diff --git a/js/src/gc/GenerateStatsPhases.py b/js/src/gc/GenerateStatsPhases.py
> +index 2daf83555..e39a26a4b 100644
> +--- a/js/src/gc/GenerateStatsPhases.py
> ++++ b/js/src/gc/GenerateStatsPhases.py
> +@@ -267,7 +267,7 @@ def generateHeader(out):
> +     #
> +     # Generate PhaseKind enum.
> +     #
> +-    phaseKindNames = map(lambda phaseKind: phaseKind.name, AllPhaseKinds)
> ++    phaseKindNames = [phaseKind.name for phaseKind in AllPhaseKinds]
> +     extraPhaseKinds = [
> +         "NONE = LIMIT",
> +         "EXPLICIT_SUSPENSION = LIMIT",
> +@@ -279,7 +279,7 @@ def generateHeader(out):
> +     #
> +     # Generate Phase enum.
> +     #
> +-    phaseNames = map(lambda phase: phase.name, AllPhases)
> ++    phaseNames = [phase.name for phase in AllPhases]
> +     extraPhases = [
> +         "NONE = LIMIT",
> +         "EXPLICIT_SUSPENSION = LIMIT",
> +diff --git a/js/src/old-configure.in b/js/src/old-configure.in
> +index 11c3d5a2e..389265404 100644
> +--- a/js/src/old-configure.in
> ++++ b/js/src/old-configure.in
> +@@ -1884,3 +1884,5 @@ if test "$JS_STANDALONE"; then
> + fi
> +
> + rm -fr confdefs* $ac_clean_files
> ++echo confdefs* $ac_clean_files removed
> ++echo "old-configure done"
> +diff --git a/memory/build/moz.build b/memory/build/moz.build
> +index e2c715271..f09ce7935 100644
> +--- a/memory/build/moz.build
> ++++ b/memory/build/moz.build
> +@@ -30,7 +30,7 @@ else:
> +         'fallback.cpp',
> +     ]
> +
> +-if CONFIG['OS_TARGET'] == 'Darwin' and (CONFIG['MOZ_REPLACE_MALLOC'] or
> ++if str(CONFIG['OS_TARGET']) == 'Darwin' and (CONFIG['MOZ_REPLACE_MALLOC'] or
> +         CONFIG['MOZ_MEMORY']):
> +     SOURCES += [
> +         'zone.c',
> +@@ -38,15 +38,15 @@ if CONFIG['OS_TARGET'] == 'Darwin' and (CONFIG['MOZ_REPLACE_MALLOC'] or
> +
> + Library('memory')
> +
> +-if CONFIG['OS_TARGET'] == 'Android' and CONFIG['CC_TYPE'] == 'clang':
> ++if str(CONFIG['OS_TARGET']) == 'Android' and str(CONFIG['CC_TYPE']) == 'clang':
> +     CXXFLAGS += [
> +         '-Wno-tautological-pointer-compare',
> +     ]
> +
> +-if CONFIG['MOZ_BUILD_APP'] != 'memory':
> ++if str(CONFIG['MOZ_BUILD_APP']) != 'memory':
> +     FINAL_LIBRARY = 'mozglue'
> +
> +-if CONFIG['CC_TYPE'] in ('msvc', 'clang-cl'):
> ++if str(CONFIG['CC_TYPE']) in ('msvc', 'clang-cl'):
> +     CXXFLAGS += ['-wd4273'] # inconsistent dll linkage (bug 558163)
> +
> + if CONFIG['MOZ_REPLACE_MALLOC_STATIC']:
> +diff --git a/mozglue/build/moz.build b/mozglue/build/moz.build
> +index 53758485a..5e9308802 100644
> +--- a/mozglue/build/moz.build
> ++++ b/mozglue/build/moz.build
> +@@ -9,12 +9,12 @@
> + # If this is ever changed, update MOZ_SHARED_MOZGLUE in browser/installer/Makefile.in
> + if CONFIG['JS_STANDALONE'] and not CONFIG['MOZ_MEMORY']:
> +     Library('mozglue')
> +-elif CONFIG['OS_TARGET'] in ('WINNT', 'Darwin', 'Android'):
> ++elif str(CONFIG['OS_TARGET']) in ('WINNT', 'Darwin', 'Android'):
> +     SharedLibrary('mozglue')
> + else:
> +     Library('mozglue')
> +
> +-if CONFIG['OS_TARGET'] == 'Android':
> ++if str(CONFIG['OS_TARGET']) == 'Android':
> +     SOURCES += [
> +         'BionicGlue.cpp',
> +     ]
> +@@ -24,14 +24,14 @@ if CONFIG['MOZ_ASAN']:
> +         'AsanOptions.cpp',
> +     ]
> +
> +-if CONFIG['OS_TARGET'] == 'WINNT':
> ++if str(CONFIG['OS_TARGET']) == 'WINNT':
> +     DEFFILE = 'mozglue.def'
> +     # We'll break the DLL blocklist if we immediately load user32.dll
> +     DELAYLOAD_DLLS += [
> +         'user32.dll',
> +     ]
> +
> +-    if CONFIG['CC_TYPE'] == "msvc":
> ++    if str(CONFIG['CC_TYPE']) == "msvc":
> +         CFLAGS += ['-guard:cf']
> +         CXXFLAGS += ['-guard:cf']
> +         LDFLAGS += ['-guard:cf']
> +@@ -48,12 +48,12 @@ if CONFIG['MOZ_WIDGET_TOOLKIT']:
> +             'dummy.cpp',
> +         ]
> +
> +-    if CONFIG['OS_TARGET'] == 'WINNT':
> ++    if str(CONFIG['OS_TARGET']) == 'WINNT':
> +         LOCAL_INCLUDES += [
> +             '/memory/build',
> +         ]
> +
> +-        if CONFIG['CC_TYPE'] == "msvc":
> ++        if str(CONFIG['CC_TYPE']) == "msvc":
> +             SOURCES += ['WindowsCFGStatus.cpp']
> +         SOURCES += [
> +             'Authenticode.cpp',
> +@@ -85,17 +85,17 @@ if CONFIG['MOZ_WIDGET_TOOLKIT']:
> +         'WindowsDllBlocklist.h',
> +     ]
> +
> +-    if CONFIG['CPU_ARCH'].startswith('x86'):
> ++    if str(CONFIG['CPU_ARCH']).startswith('x86'):
> +         SOURCES += [
> +             'SSE.cpp',
> +         ]
> +
> +-    if CONFIG['CPU_ARCH'] == 'arm':
> ++    if str(CONFIG['CPU_ARCH']) == 'arm':
> +         SOURCES += [
> +             'arm.cpp',
> +         ]
> +
> +-    if CONFIG['CPU_ARCH'].startswith('mips'):
> ++    if str(CONFIG['CPU_ARCH']).startswith('mips'):
> +         SOURCES += [
> +             'mips.cpp',
> +         ]
> +@@ -114,7 +114,7 @@ LIBRARY_DEFINES['MOZ_HAS_MOZGLUE'] = True
> +
> + LDFLAGS += CONFIG['MOZ_GLUE_WRAP_LDFLAGS']
> +
> +-if CONFIG['OS_TARGET'] == 'Darwin':
> ++if str(CONFIG['OS_TARGET']) == 'Darwin':
> +     # On OSX 10.10.3, a dead lock happens in some cases involving dynamic
> +     # symbol resolution for symbols that jemalloc itself uses. While it
> +     # might be possible to find a way to avoid all such symbol resolutions,
> +@@ -124,7 +124,7 @@ if CONFIG['OS_TARGET'] == 'Darwin':
> +     # for TLS.
> +     LDFLAGS += ['-Wl,-bind_at_load']
> +
> +-if CONFIG['MOZ_LINKER'] and CONFIG['TARGET_CPU'] == 'arm':
> ++if CONFIG['MOZ_LINKER'] and str(CONFIG['TARGET_CPU']) == 'arm':
> +     LDFLAGS += ['-Wl,-version-script,%s/arm-eabi-filter' % SRCDIR]
> +
> + DIST_INSTALL = True
> +diff --git a/python/mozbuild/mozbuild/action/check_binary.py b/python/mozbuild/mozbuild/action/check_binary.py
> +index 5665ef053..b696f73d6 100644
> +--- a/python/mozbuild/mozbuild/action/check_binary.py
> ++++ b/python/mozbuild/mozbuild/action/check_binary.py
> +@@ -104,6 +104,8 @@ def iter_readelf_symbols(target, binary):
> +
> + def iter_readelf_dynamic(target, binary):
> +     for line in get_output(target['readelf'], '-d', binary):
> ++        if isinstance(line, bytes):
> ++            line=line.decode('utf-8')
> +         data = line.split(None, 2)
> +         if data and len(data) == 3 and data[0].startswith('0x'):
> +             yield data[1].rstrip(')').lstrip('('), data[2]
> +diff --git a/python/mozbuild/mozbuild/action/process_define_files.py b/python/mozbuild/mozbuild/action/process_define_files.py
> +index 563fbb8fa..c3df2869b 100644
> +--- a/python/mozbuild/mozbuild/action/process_define_files.py
> ++++ b/python/mozbuild/mozbuild/action/process_define_files.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import argparse
> + import os
> +@@ -53,7 +53,7 @@ def process_define_file(output, input):
> +                                 'CONFIGURE_DEFINE_FILE')
> +                         defines = '\n'.join(sorted(
> +                             '#define %s %s' % (name, val)
> +-                            for name, val in config.defines['ALLDEFINES'].iteritems()))
> ++                            for name, val in config.defines['ALLDEFINES'].items()))
> +                         l = l[:m.start('cmd') - 1] \
> +                             + defines + l[m.end('name'):]
> +                     elif cmd == 'define':
> +diff --git a/python/mozbuild/mozbuild/backend/base.py b/python/mozbuild/mozbuild/backend/base.py
> +index a8d5c94e0..7cda63475 100644
> +--- a/python/mozbuild/mozbuild/backend/base.py
> ++++ b/python/mozbuild/mozbuild/backend/base.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + from abc import (
> +     ABCMeta,
> +@@ -31,7 +31,7 @@ from .configenvironment import ConfigEnvironment
> + from mozbuild.base import ExecutionSummary
> +
> +
> +-class BuildBackend(LoggingMixin):
> ++class BuildBackend(LoggingMixin, metaclass=ABCMeta):
> +     """Abstract base class for build backends.
> +
> +     A build backend is merely a consumer of the build configuration (the output
> +@@ -39,8 +39,6 @@ class BuildBackend(LoggingMixin):
> +     is the discretion of the specific implementation.
> +     """
> +
> +-    __metaclass__ = ABCMeta
> +-
> +     def __init__(self, environment):
> +         assert isinstance(environment, (ConfigEnvironment, EmptyConfig))
> +         self.populate_logger()
> +@@ -311,7 +309,7 @@ class BuildBackend(LoggingMixin):
> +         srcdir = mozpath.dirname(obj.input_path)
> +         pp.context.update({
> +             k: ' '.join(v) if isinstance(v, list) else v
> +-            for k, v in obj.config.substs.iteritems()
> ++            for k, v in obj.config.substs.items()
> +         })
> +         pp.context.update(
> +             top_srcdir=obj.topsrcdir,
> +diff --git a/python/mozbuild/mozbuild/backend/common.py b/python/mozbuild/mozbuild/backend/common.py
> +index d00cbbcaf..f747df446 100644
> +--- a/python/mozbuild/mozbuild/backend/common.py
> ++++ b/python/mozbuild/mozbuild/backend/common.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import json
> + import os
> +@@ -174,7 +174,7 @@ class CommonBackend(BuildBackend):
> +         if len(self._idl_manager.idls):
> +             self._write_rust_xpidl_summary(self._idl_manager)
> +             self._handle_idl_manager(self._idl_manager)
> +-            self._handle_generated_sources(mozpath.join(self.environment.topobjdir, 'dist/include/%s.h' % idl['root']) for idl in self._idl_manager.idls.values())
> ++            self._handle_generated_sources(mozpath.join(self.environment.topobjdir, 'dist/include/%s.h' % idl['root']) for idl in list(self._idl_manager.idls.values()))
> +
> +
> +         for config in self._configs:
> +@@ -372,14 +372,14 @@ class CommonBackend(BuildBackend):
> +
> +         with self._write_file(mozpath.join(topobjdir, 'dist', 'xpcrs', 'rt', 'all.rs')) as fh:
> +             fh.write("// THIS FILE IS GENERATED - DO NOT EDIT\n\n")
> +-            for idl in manager.idls.values():
> ++            for idl in list(manager.idls.values()):
> +                 fh.write(include_tmpl % ("rt", idl['root']))
> +                 fh.write(";\n")
> +
> +         with self._write_file(mozpath.join(topobjdir, 'dist', 'xpcrs', 'bt', 'all.rs')) as fh:
> +             fh.write("// THIS FILE IS GENERATED - DO NOT EDIT\n\n")
> +             fh.write("&[\n")
> +-            for idl in manager.idls.values():
> ++            for idl in list(manager.idls.values()):
> +                 fh.write(include_tmpl % ("bt", idl['root']))
> +                 fh.write(",\n")
> +             fh.write("]\n")
> +diff --git a/python/mozbuild/mozbuild/backend/configenvironment.py b/python/mozbuild/mozbuild/backend/configenvironment.py
> +index 3676a7d18..f0896cea4 100644
> +--- a/python/mozbuild/mozbuild/backend/configenvironment.py
> ++++ b/python/mozbuild/mozbuild/backend/configenvironment.py
> +@@ -2,14 +2,14 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import os
> + import sys
> + import json
> +
> + from collections import Iterable, OrderedDict
> +-from types import StringTypes, ModuleType
> ++from types import ModuleType
> +
> + import mozpack.path as mozpath
> +
> +@@ -22,7 +22,7 @@ from mozbuild.shellutil import quote as shell_quote
> +
> +
> + if sys.version_info.major == 2:
> +-    text_type = unicode
> ++    text_type = str
> + else:
> +     text_type = str
> +
> +@@ -151,7 +151,7 @@ class ConfigEnvironment(object):
> +             shell_quote(self.defines[name]).replace('$', '$$'))
> +             for name in sorted(global_defines)])
> +         def serialize(name, obj):
> +-            if isinstance(obj, StringTypes):
> ++            if isinstance(obj, str):
> +                 return obj
> +             if isinstance(obj, Iterable):
> +                 return ' '.join(obj)
> +@@ -185,8 +185,8 @@ class ConfigEnvironment(object):
> +                 except UnicodeDecodeError:
> +                     return v.decode('utf-8', 'replace')
> +
> +-        for k, v in self.substs.items():
> +-            if not isinstance(v, StringTypes):
> ++        for k, v in list(self.substs.items()):
> ++            if not isinstance(v, str):
> +                 if isinstance(v, Iterable):
> +                     type(v)(decode(i) for i in v)
> +             elif not isinstance(v, text_type):
> +@@ -255,7 +255,7 @@ class PartialConfigDict(object):
> +         existing_files = self._load_config_track()
> +
> +         new_files = set()
> +-        for k, v in values.iteritems():
> ++        for k, v in values.items():
> +             new_files.add(self._write_file(k, v))
> +
> +         for filename in existing_files - new_files:
> +diff --git a/python/mozbuild/mozbuild/backend/fastermake.py b/python/mozbuild/mozbuild/backend/fastermake.py
> +index b029aa10f..b66ade64f 100644
> +--- a/python/mozbuild/mozbuild/backend/fastermake.py
> ++++ b/python/mozbuild/mozbuild/backend/fastermake.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals, print_function
> ++
> +
> + from mozbuild.backend.base import PartialBackend
> + from mozbuild.backend.common import CommonBackend
> +@@ -140,7 +140,7 @@ class FasterMakeBackend(CommonBackend, PartialBackend):
> +         # Add information for chrome manifest generation
> +         manifest_targets = []
> +
> +-        for target, entries in self._manifest_entries.iteritems():
> ++        for target, entries in self._manifest_entries.items():
> +             manifest_targets.append(target)
> +             install_target = mozpath.basedir(target, install_manifests_bases)
> +             self._install_manifests[install_target].add_content(
> +@@ -152,13 +152,13 @@ class FasterMakeBackend(CommonBackend, PartialBackend):
> +                          % ' '.join(self._install_manifests.keys()))
> +
> +         # Add dependencies we infered:
> +-        for target, deps in self._dependencies.iteritems():
> ++        for target, deps in self._dependencies.items():
> +             mk.create_rule([target]).add_dependencies(
> +                 '$(TOPOBJDIR)/%s' % d for d in deps)
> +
> +         mk.add_statement('include $(TOPSRCDIR)/config/faster/rules.mk')
> +
> +-        for base, install_manifest in self._install_manifests.iteritems():
> ++        for base, install_manifest in self._install_manifests.items():
> +             with self._write_file(
> +                     mozpath.join(self.environment.topobjdir, 'faster',
> +                                  'install_%s' % base.replace('/', '_'))) as fh:
> +@@ -167,7 +167,7 @@ class FasterMakeBackend(CommonBackend, PartialBackend):
> +         # For artifact builds only, write a single unified manifest for consumption by |mach watch|.
> +         if self.environment.is_artifact_build:
> +             unified_manifest = InstallManifest()
> +-            for base, install_manifest in self._install_manifests.iteritems():
> ++            for base, install_manifest in self._install_manifests.items():
> +                 # Expect 'dist/bin/**', which includes 'dist/bin' with no trailing slash.
> +                 assert base.startswith('dist/bin')
> +                 base = base[len('dist/bin'):]
> +diff --git a/python/mozbuild/mozbuild/backend/recursivemake.py b/python/mozbuild/mozbuild/backend/recursivemake.py
> +index dd9020d62..aa89cc297 100644
> +--- a/python/mozbuild/mozbuild/backend/recursivemake.py
> ++++ b/python/mozbuild/mozbuild/backend/recursivemake.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import logging
> + import os
> +@@ -12,7 +12,7 @@ from collections import (
> +     defaultdict,
> +     namedtuple,
> + )
> +-from StringIO import StringIO
> ++from io import StringIO
> + from itertools import chain
> +
> + from mozpack.manifests import (
> +@@ -80,75 +80,76 @@ from ..util import (
> + )
> + from ..makeutil import Makefile
> + from mozbuild.shellutil import quote as shell_quote
> ++from functools import reduce
> +
> + MOZBUILD_VARIABLES = [
> +-    b'ASFLAGS',
> +-    b'CMSRCS',
> +-    b'CMMSRCS',
> +-    b'CPP_UNIT_TESTS',
> +-    b'DIRS',
> +-    b'DIST_INSTALL',
> +-    b'EXTRA_DSO_LDOPTS',
> +-    b'EXTRA_JS_MODULES',
> +-    b'EXTRA_PP_COMPONENTS',
> +-    b'EXTRA_PP_JS_MODULES',
> +-    b'FORCE_SHARED_LIB',
> +-    b'FORCE_STATIC_LIB',
> +-    b'FINAL_LIBRARY',
> +-    b'HOST_CFLAGS',
> +-    b'HOST_CSRCS',
> +-    b'HOST_CMMSRCS',
> +-    b'HOST_CXXFLAGS',
> +-    b'HOST_EXTRA_LIBS',
> +-    b'HOST_LIBRARY_NAME',
> +-    b'HOST_PROGRAM',
> +-    b'HOST_SIMPLE_PROGRAMS',
> +-    b'JAR_MANIFEST',
> +-    b'JAVA_JAR_TARGETS',
> +-    b'LIBRARY_NAME',
> +-    b'LIBS',
> +-    b'MAKE_FRAMEWORK',
> +-    b'MODULE',
> +-    b'NO_DIST_INSTALL',
> +-    b'NO_EXPAND_LIBS',
> +-    b'NO_INTERFACES_MANIFEST',
> +-    b'NO_JS_MANIFEST',
> +-    b'OS_LIBS',
> +-    b'PARALLEL_DIRS',
> +-    b'PREF_JS_EXPORTS',
> +-    b'PROGRAM',
> +-    b'RESOURCE_FILES',
> +-    b'SHARED_LIBRARY_LIBS',
> +-    b'SHARED_LIBRARY_NAME',
> +-    b'SIMPLE_PROGRAMS',
> +-    b'SONAME',
> +-    b'STATIC_LIBRARY_NAME',
> +-    b'TEST_DIRS',
> +-    b'TOOL_DIRS',
> ++    'ASFLAGS',
> ++    'CMSRCS',
> ++    'CMMSRCS',
> ++    'CPP_UNIT_TESTS',
> ++    'DIRS',
> ++    'DIST_INSTALL',
> ++    'EXTRA_DSO_LDOPTS',
> ++    'EXTRA_JS_MODULES',
> ++    'EXTRA_PP_COMPONENTS',
> ++    'EXTRA_PP_JS_MODULES',
> ++    'FORCE_SHARED_LIB',
> ++    'FORCE_STATIC_LIB',
> ++    'FINAL_LIBRARY',
> ++    'HOST_CFLAGS',
> ++    'HOST_CSRCS',
> ++    'HOST_CMMSRCS',
> ++    'HOST_CXXFLAGS',
> ++    'HOST_EXTRA_LIBS',
> ++    'HOST_LIBRARY_NAME',
> ++    'HOST_PROGRAM',
> ++    'HOST_SIMPLE_PROGRAMS',
> ++    'JAR_MANIFEST',
> ++    'JAVA_JAR_TARGETS',
> ++    'LIBRARY_NAME',
> ++    'LIBS',
> ++    'MAKE_FRAMEWORK',
> ++    'MODULE',
> ++    'NO_DIST_INSTALL',
> ++    'NO_EXPAND_LIBS',
> ++    'NO_INTERFACES_MANIFEST',
> ++    'NO_JS_MANIFEST',
> ++    'OS_LIBS',
> ++    'PARALLEL_DIRS',
> ++    'PREF_JS_EXPORTS',
> ++    'PROGRAM',
> ++    'RESOURCE_FILES',
> ++    'SHARED_LIBRARY_LIBS',
> ++    'SHARED_LIBRARY_NAME',
> ++    'SIMPLE_PROGRAMS',
> ++    'SONAME',
> ++    'STATIC_LIBRARY_NAME',
> ++    'TEST_DIRS',
> ++    'TOOL_DIRS',
> +     # XXX config/Makefile.in specifies this in a make invocation
> +     #'USE_EXTENSION_MANIFEST',
> +-    b'XPCSHELL_TESTS',
> +-    b'XPIDL_MODULE',
> ++    'XPCSHELL_TESTS',
> ++    'XPIDL_MODULE',
> + ]
> +
> + DEPRECATED_VARIABLES = [
> +-    b'EXPORT_LIBRARY',
> +-    b'EXTRA_LIBS',
> +-    b'HOST_LIBS',
> +-    b'LIBXUL_LIBRARY',
> +-    b'MOCHITEST_A11Y_FILES',
> +-    b'MOCHITEST_BROWSER_FILES',
> +-    b'MOCHITEST_BROWSER_FILES_PARTS',
> +-    b'MOCHITEST_CHROME_FILES',
> +-    b'MOCHITEST_FILES',
> +-    b'MOCHITEST_FILES_PARTS',
> +-    b'MOCHITEST_METRO_FILES',
> +-    b'MOCHITEST_ROBOCOP_FILES',
> +-    b'MODULE_OPTIMIZE_FLAGS',
> +-    b'MOZ_CHROME_FILE_FORMAT',
> +-    b'SHORT_LIBNAME',
> +-    b'TESTING_JS_MODULES',
> +-    b'TESTING_JS_MODULE_DIR',
> ++    'EXPORT_LIBRARY',
> ++    'EXTRA_LIBS',
> ++    'HOST_LIBS',
> ++    'LIBXUL_LIBRARY',
> ++    'MOCHITEST_A11Y_FILES',
> ++    'MOCHITEST_BROWSER_FILES',
> ++    'MOCHITEST_BROWSER_FILES_PARTS',
> ++    'MOCHITEST_CHROME_FILES',
> ++    'MOCHITEST_FILES',
> ++    'MOCHITEST_FILES_PARTS',
> ++    'MOCHITEST_METRO_FILES',
> ++    'MOCHITEST_ROBOCOP_FILES',
> ++    'MODULE_OPTIMIZE_FLAGS',
> ++    'MOZ_CHROME_FILE_FORMAT',
> ++    'SHORT_LIBNAME',
> ++    'TESTING_JS_MODULES',
> ++    'TESTING_JS_MODULE_DIR',
> + ]
> +
> + MOZBUILD_VARIABLES_MESSAGE = 'It should only be defined in moz.build files.'
> +@@ -207,7 +208,7 @@ class BackendMakeFile(object):
> +         self.fh.write(buf)
> +
> +     def write_once(self, buf):
> +-        if isinstance(buf, unicode):
> ++        if isinstance(buf, str):
> +             buf = buf.encode('utf-8')
> +         if b'\n' + buf not in self.fh.getvalue():
> +             self.write(buf)
> +@@ -280,7 +281,7 @@ class RecursiveMakeTraversal(object):
> +         Helper function to call a filter from compute_dependencies and
> +         traverse.
> +         """
> +-        return filter(current, self.get_subdirs(current))
> ++        return list(filter(current, self.get_subdirs(current)))
> +
> +     def compute_dependencies(self, filter=None):
> +         """
> +@@ -710,7 +711,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         convenience variables, and the other dependency definitions for a
> +         hopefully proper directory traversal.
> +         """
> +-        for tier, no_skip in self._no_skip.items():
> ++        for tier, no_skip in list(self._no_skip.items()):
> +             self.log(logging.DEBUG, 'fill_root_mk', {
> +                 'number': len(no_skip), 'tier': tier
> +                 }, 'Using {number} directories during {tier}')
> +@@ -757,7 +758,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         for tier, filter in filters:
> +             main, all_deps = \
> +                 self._traversal.compute_dependencies(filter)
> +-            for dir, deps in all_deps.items():
> ++            for dir, deps in list(all_deps.items()):
> +                 if deps is not None or (dir in self._idl_dirs \
> +                                         and tier == 'export'):
> +                     rule = root_deps_mk.create_rule(['%s/%s' % (dir, tier)])
> +@@ -770,7 +771,7 @@ class RecursiveMakeBackend(CommonBackend):
> +                 rule.add_dependencies('%s/%s' % (d, tier) for d in main)
> +
> +         all_compile_deps = reduce(lambda x,y: x|y,
> +-            self._compile_graph.values()) if self._compile_graph else set()
> ++            list(self._compile_graph.values())) if self._compile_graph else set()
> +         # Include the following as dependencies of the top recursion target for
> +         # compilation:
> +         # - nodes that are not dependended upon by anything. Typically, this
> +@@ -783,7 +784,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         #   as direct dependencies of the top recursion target, to somehow
> +         #   prioritize them.
> +         #   1. See bug 1262241 comment 5.
> +-        compile_roots = [t for t, deps in self._compile_graph.iteritems()
> ++        compile_roots = [t for t, deps in list(self._compile_graph.items())
> +                          if not deps or t not in all_compile_deps]
> +
> +         rule = root_deps_mk.create_rule(['recurse_compile'])
> +@@ -845,14 +846,14 @@ class RecursiveMakeBackend(CommonBackend):
> +             rule.add_dependencies(['$(CURDIR)/%: %'])
> +
> +     def _check_blacklisted_variables(self, makefile_in, makefile_content):
> +-        if b'EXTERNALLY_MANAGED_MAKE_FILE' in makefile_content:
> ++        if 'EXTERNALLY_MANAGED_MAKE_FILE' in makefile_content:
> +             # Bypass the variable restrictions for externally managed makefiles.
> +             return
> +
> +         for l in makefile_content.splitlines():
> +             l = l.strip()
> +             # Don't check comments
> +-            if l.startswith(b'#'):
> ++            if l.startswith('#'):
> +                 continue
> +             for x in chain(MOZBUILD_VARIABLES, DEPRECATED_VARIABLES):
> +                 if x not in l:
> +@@ -909,11 +910,11 @@ class RecursiveMakeBackend(CommonBackend):
> +                     # Directories with a Makefile containing a tools target, or
> +                     # XPI_PKGNAME or INSTALL_EXTENSION_ID can't be skipped and
> +                     # must run during the 'tools' tier.
> +-                    for t in (b'XPI_PKGNAME', b'INSTALL_EXTENSION_ID',
> +-                            b'tools'):
> ++                    for t in ('XPI_PKGNAME', 'INSTALL_EXTENSION_ID',
> ++                            'tools'):
> +                         if t not in content:
> +                             continue
> +-                        if t == b'tools' and not re.search('(?:^|\s)tools.*::', content, re.M):
> ++                        if t == 'tools' and not re.search('(?:^|\s)tools.*::', content, re.M):
> +                             continue
> +                         if objdir == self.environment.topobjdir:
> +                             continue
> +@@ -933,7 +934,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         self._fill_root_mk()
> +
> +         # Make the master test manifest files.
> +-        for flavor, t in self._test_manifests.items():
> ++        for flavor, t in list(self._test_manifests.items()):
> +             install_prefix, manifests = t
> +             manifest_stem = mozpath.join(install_prefix, '%s.ini' % flavor)
> +             self._write_master_test_manifest(mozpath.join(
> +@@ -1039,7 +1040,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         for p in ('Makefile', 'backend.mk', '.deps/.mkdir.done'):
> +             build_files.add_optional_exists(p)
> +
> +-        for idl in manager.idls.values():
> ++        for idl in list(manager.idls.values()):
> +             self._install_manifests['dist_idl'].add_link(idl['source'],
> +                 idl['basename'])
> +             self._install_manifests['dist_include'].add_optional_exists('%s.h'
> +@@ -1086,7 +1087,7 @@ class RecursiveMakeBackend(CommonBackend):
> +
> +         interfaces_manifests = []
> +         dist_dir = mozpath.join(self.environment.topobjdir, 'dist')
> +-        for manifest, entries in manager.interface_manifests.items():
> ++        for manifest, entries in list(manager.interface_manifests.items()):
> +             interfaces_manifests.append(mozpath.join('$(DEPTH)', manifest))
> +             for xpt in sorted(entries):
> +                 registered_xpt_files.add(mozpath.join(
> +@@ -1194,7 +1195,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         # Don't allow files to be defined multiple times unless it is allowed.
> +         # We currently allow duplicates for non-test files or test files if
> +         # the manifest is listed as a duplicate.
> +-        for source, (dest, is_test) in obj.installs.items():
> ++        for source, (dest, is_test) in list(obj.installs.items()):
> +             try:
> +                 self._install_manifests['_test_files'].add_link(source, dest)
> +             except ValueError:
> +@@ -1558,7 +1559,7 @@ class RecursiveMakeBackend(CommonBackend):
> +         man_dir = mozpath.join(self.environment.topobjdir, '_build_manifests',
> +             dest)
> +
> +-        for k, manifest in manifests.items():
> ++        for k, manifest in list(manifests.items()):
> +             with self._write_file(mozpath.join(man_dir, k)) as fh:
> +                 manifest.write(fileobj=fh)
> +
> +@@ -1593,20 +1594,20 @@ class RecursiveMakeBackend(CommonBackend):
> +                 pp.context.update(extra)
> +             if not pp.context.get('autoconfmk', ''):
> +                 pp.context['autoconfmk'] = 'autoconf.mk'
> +-            pp.handleLine(b'# THIS FILE WAS AUTOMATICALLY GENERATED. DO NOT MODIFY BY HAND.\n');
> +-            pp.handleLine(b'DEPTH := @DEPTH@\n')
> +-            pp.handleLine(b'topobjdir := @topobjdir@\n')
> +-            pp.handleLine(b'topsrcdir := @top_srcdir@\n')
> +-            pp.handleLine(b'srcdir := @srcdir@\n')
> +-            pp.handleLine(b'VPATH := @srcdir@\n')
> +-            pp.handleLine(b'relativesrcdir := @relativesrcdir@\n')
> +-            pp.handleLine(b'include $(DEPTH)/config/@autoconfmk@\n')
> ++            pp.handleLine('# THIS FILE WAS AUTOMATICALLY GENERATED. DO NOT MODIFY BY HAND.\n');
> ++            pp.handleLine('DEPTH := @DEPTH@\n')
> ++            pp.handleLine('topobjdir := @topobjdir@\n')
> ++            pp.handleLine('topsrcdir := @top_srcdir@\n')
> ++            pp.handleLine('srcdir := @srcdir@\n')
> ++            pp.handleLine('VPATH := @srcdir@\n')
> ++            pp.handleLine('relativesrcdir := @relativesrcdir@\n')
> ++            pp.handleLine('include $(DEPTH)/config/@autoconfmk@\n')
> +             if not stub:
> +                 pp.do_include(obj.input_path)
> +             # Empty line to avoid failures when last line in Makefile.in ends
> +             # with a backslash.
> +-            pp.handleLine(b'\n')
> +-            pp.handleLine(b'include $(topsrcdir)/config/recurse.mk\n')
> ++            pp.handleLine('\n')
> ++            pp.handleLine('include $(topsrcdir)/config/recurse.mk\n')
> +         if not stub:
> +             # Adding the Makefile.in here has the desired side-effect
> +             # that if the Makefile.in disappears, this will force
> +diff --git a/python/mozbuild/mozbuild/config_status.py b/python/mozbuild/mozbuild/config_status.py
> +index d46f1332d..a9a27a699 100644
> +--- a/python/mozbuild/mozbuild/config_status.py
> ++++ b/python/mozbuild/mozbuild/config_status.py
> +@@ -77,6 +77,7 @@ def config_status(topobjdir='.', topsrcdir='.', defines=None,
> +     See build/autoconf/config.status.m4.
> +     '''
> +
> ++    print("config_status started")
> +     if 'CONFIG_FILES' in os.environ:
> +         raise Exception('Using the CONFIG_FILES environment variable is not '
> +             'supported.')
> +@@ -119,7 +120,7 @@ def config_status(topobjdir='.', topsrcdir='.', defines=None,
> +     if 'WRITE_MOZINFO' in os.environ:
> +         write_mozinfo(os.path.join(topobjdir, 'mozinfo.json'), env, os.environ)
> +
> +-    cpu_start = time.clock()
> ++    cpu_start = time.perf_counter()
> +     time_start = time.time()
> +
> +     # Make appropriate backend instances, defaulting to RecursiveMakeBackend,
> +@@ -155,7 +156,7 @@ def config_status(topobjdir='.', topsrcdir='.', defines=None,
> +             summary = obj.gyp_summary()
> +             print(summary, file=sys.stderr)
> +
> +-    cpu_time = time.clock() - cpu_start
> ++    cpu_time = time.perf_counter() - cpu_start
> +     wall_time = time.time() - time_start
> +     efficiency = cpu_time / wall_time if wall_time else 100
> +     untracked = wall_time - execution_time
> +@@ -179,3 +180,5 @@ def config_status(topobjdir='.', topsrcdir='.', defines=None,
> +     # Advertise Android Studio if it is appropriate.
> +     if MachCommandConditions.is_android(env):
> +         print(ANDROID_IDE_ADVERTISEMENT)
> ++
> ++    print("config_status finished")
> +diff --git a/python/mozbuild/mozbuild/configure/__init__.py b/python/mozbuild/mozbuild/configure/__init__.py
> +index d03615707..13d623d4f 100644
> +--- a/python/mozbuild/mozbuild/configure/__init__.py
> ++++ b/python/mozbuild/mozbuild/configure/__init__.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> +
> +-import __builtin__
> ++
> ++import builtins
> + import inspect
> + import logging
> + import os
> +@@ -38,6 +38,8 @@ from mozbuild.util import (
> +
> + import mozpack.path as mozpath
> +
> ++import traceback
> ++
> +
> + class ConfigureError(Exception):
> +     pass
> +@@ -69,7 +71,7 @@ class SandboxDependsFunction(object):
> +     def __getattr__(self, key):
> +         return self._getattr(key).sandboxed
> +
> +-    def __nonzero__(self):
> ++    def __bool__(self):
> +         raise ConfigureError(
> +             'Cannot do boolean operations on @depends functions.')
> +
> +@@ -96,6 +98,7 @@ class DependsFunction(object):
> +             sandbox._value_for(self)
> +         elif not sandbox._help:
> +             sandbox._execution_queue.append((sandbox._value_for, (self,)))
> ++            sandbox.tasks_debug_out("DependsFunction.__init %s" % func.__name__)
> +
> +     @property
> +     def name(self):
> +@@ -206,6 +209,15 @@ class CombinedDependsFunction(DependsFunction):
> +     def __ne__(self, other):
> +         return not self == other
> +
> ++    def __hash__(self):
> ++        # This was one was taken from [1] initially. Should not have done that:
> ++        # it causes explosion of ConfigureSandbox._execution_queue with 100%
> ++        # CPU load and eating all avaliable memory...
> ++        #
> ++        # [1] https://code.foxkit.us/adelie/packages/blob/f2b5773da19ab397fbe64fd32dacc383cfe4cd77/user/mozjs/python3.patch#L8068
> ++        return hash((self._name, tuple(self.dependencies)))
> ++
> ++
> + class SandboxedGlobal(dict):
> +     '''Identifiable dict type for use as function global'''
> +
> +@@ -253,11 +265,12 @@ class ConfigureSandbox(dict):
> +     # The default set of builtins. We expose unicode as str to make sandboxed
> +     # files more python3-ready.
> +     BUILTINS = ReadOnlyDict({
> +-        b: getattr(__builtin__, b)
> ++        b: getattr(builtins, b)
> +         for b in ('None', 'False', 'True', 'int', 'bool', 'any', 'all', 'len',
> +                   'list', 'tuple', 'set', 'dict', 'isinstance', 'getattr',
> +-                  'hasattr', 'enumerate', 'range', 'zip')
> +-    }, __import__=forbidden_import, str=unicode)
> ++                  'hasattr', 'enumerate', 'range', 'zip', '__build_class__',
> ++                  'bytes', 'exec')
> ++    }, __import__=forbidden_import, str=str)
> +
> +     # Expose a limited set of functions from os.path
> +     OS = ReadOnlyNamespace(path=ReadOnlyNamespace(**{
> +@@ -294,6 +307,11 @@ class ConfigureSandbox(dict):
> +         # Queue of functions to execute, with their arguments
> +         self._execution_queue = []
> +
> ++        # For debugging: Show number of tasks started in run() / added elsewhere
> ++        # and some additional info
> ++        self.task_debug = False # set True to enable
> ++        self.tasks_started = 0
> ++
> +         # Store the `when`s associated to some options.
> +         self._conditions = {}
> +
> +@@ -331,7 +349,7 @@ class ConfigureSandbox(dict):
> +                 return method
> +             def wrapped(*args, **kwargs):
> +                 out_args = [
> +-                    arg.decode(encoding) if isinstance(arg, str) else arg
> ++                    arg.decode(encoding) if isinstance(arg, bytes) else arg
> +                     for arg in args
> +                 ]
> +                 return method(*out_args, **kwargs)
> +@@ -360,6 +378,14 @@ class ConfigureSandbox(dict):
> +             handler.setFormatter(formatter)
> +             logger.addHandler(handler)
> +
> ++    def tasks_debug_out(self, text):
> ++        if self.task_debug:
> ++            print("%s / queued %i / done %i" %(text, len(self._execution_queue), self.tasks_started))
> ++            #if len(self._execution_queue) > 5000:
> ++            #    traceback.print_stack(file=sys.stdout)
> ++            #if len(self._execution_queue) > 5010:
> ++            #    raise Exception("Too many tasks")
> ++
> +     def include_file(self, path):
> +         '''Include one file in the sandbox. Users of this class probably want
> +         to use `run` instead.
> +@@ -380,6 +406,9 @@ class ConfigureSandbox(dict):
> +         if path in self._all_paths:
> +             raise ConfigureError(
> +                 'Cannot include `%s` because it was included already.' % path)
> ++
> ++        if self.task_debug:
> ++            print("include_file", path)
> +         self._paths.append(path)
> +         self._all_paths.add(path)
> +
> +@@ -398,7 +427,7 @@ class ConfigureSandbox(dict):
> +         if path:
> +             self.include_file(path)
> +
> +-        for option in self._options.itervalues():
> ++        for option in self._options.values():
> +             # All options must be referenced by some @depends function
> +             if option not in self._seen:
> +                 raise ConfigureError(
> +@@ -425,6 +454,8 @@ class ConfigureSandbox(dict):
> +
> +         # Run the execution queue
> +         for func, args in self._execution_queue:
> ++            self.tasks_started += 1
> ++            self.tasks_debug_out("ConfigureSandbox.run(%s)" % func.__name__)
> +             func(*args)
> +
> +         if self._help:
> +@@ -504,7 +535,7 @@ class ConfigureSandbox(dict):
> +                     value = PositiveOptionValue()
> +                 elif value is False or value == ():
> +                     value = NegativeOptionValue()
> +-                elif isinstance(value, types.StringTypes):
> ++                elif isinstance(value, (str,)):
> +                     value = PositiveOptionValue((value,))
> +                 elif isinstance(value, tuple):
> +                     value = PositiveOptionValue(value)
> +@@ -544,7 +575,7 @@ class ConfigureSandbox(dict):
> +         return value
> +
> +     def _dependency(self, arg, callee_name, arg_name=None):
> +-        if isinstance(arg, types.StringTypes):
> ++        if isinstance(arg, (str,)):
> +             prefix, name, values = Option.split_option(arg)
> +             if values != ():
> +                 raise ConfigureError("Option must not contain an '='")
> +@@ -608,7 +639,7 @@ class ConfigureSandbox(dict):
> +         '''
> +         when = self._normalize_when(kwargs.get('when'), 'option')
> +         args = [self._resolve(arg) for arg in args]
> +-        kwargs = {k: self._resolve(v) for k, v in kwargs.iteritems()
> ++        kwargs = {k: self._resolve(v) for k, v in kwargs.items()
> +                                       if k != 'when'}
> +         option = Option(*args, **kwargs)
> +         if when:
> +@@ -689,7 +720,7 @@ class ConfigureSandbox(dict):
> +         with self.only_when_impl(when):
> +             what = self._resolve(what)
> +             if what:
> +-                if not isinstance(what, types.StringTypes):
> ++                if not isinstance(what, (str,)):
> +                     raise TypeError("Unexpected type: '%s'" % type(what).__name__)
> +                 self.include_file(what)
> +
> +@@ -707,7 +738,7 @@ class ConfigureSandbox(dict):
> +             (k[:-len('_impl')], getattr(self, k))
> +             for k in dir(self) if k.endswith('_impl') and k != 'template_impl'
> +         )
> +-        glob.update((k, v) for k, v in self.iteritems() if k not in glob)
> ++        glob.update((k, v) for k, v in self.items() if k not in glob)
> +
> +         # Any function argument to the template must be prepared to be sandboxed.
> +         # If the template itself returns a function (in which case, it's very
> +@@ -731,7 +762,7 @@ class ConfigureSandbox(dict):
> +             def wrapper(*args, **kwargs):
> +                 args = [maybe_prepare_function(arg) for arg in args]
> +                 kwargs = {k: maybe_prepare_function(v)
> +-                          for k, v in kwargs.iteritems()}
> ++                          for k, v in kwargs.items()}
> +                 ret = template(*args, **kwargs)
> +                 if isfunction(ret):
> +                     # We can't expect the sandboxed code to think about all the
> +@@ -766,7 +797,7 @@ class ConfigureSandbox(dict):
> +         for value, required in (
> +                 (_import, True), (_from, False), (_as, False)):
> +
> +-            if not isinstance(value, types.StringTypes) and (
> ++            if not isinstance(value, (str,)) and (
> +                     required or value is not None):
> +                 raise TypeError("Unexpected type: '%s'" % type(value).__name__)
> +             if value is not None and not self.RE_MODULE.match(value):
> +@@ -807,7 +838,7 @@ class ConfigureSandbox(dict):
> +         # Special case for the open() builtin, because otherwise, using it
> +         # fails with "IOError: file() constructor not accessible in
> +         # restricted mode"
> +-        if what == '__builtin__.open':
> ++        if what == 'builtins.open':
> +             return lambda *args, **kwargs: open(*args, **kwargs)
> +         # Until this proves to be a performance problem, just construct an
> +         # import statement and execute it.
> +@@ -829,7 +860,7 @@ class ConfigureSandbox(dict):
> +         name = self._resolve(name, need_help_dependency=False)
> +         if name is None:
> +             return
> +-        if not isinstance(name, types.StringTypes):
> ++        if not isinstance(name, (str,)):
> +             raise TypeError("Unexpected type: '%s'" % type(name).__name__)
> +         if name in data:
> +             raise ConfigureError(
> +@@ -850,6 +881,7 @@ class ConfigureSandbox(dict):
> +
> +         self._execution_queue.append((
> +             self._resolve_and_set, (self._config, name, value, when)))
> ++        self.tasks_debug_out("ConfigureSandbox.set_config_impl / %s(%s" % (name, value))
> +
> +     def set_define_impl(self, name, value, when=None):
> +         '''Implementation of set_define().
> +@@ -864,6 +896,7 @@ class ConfigureSandbox(dict):
> +         defines = self._config.setdefault('DEFINES', {})
> +         self._execution_queue.append((
> +             self._resolve_and_set, (defines, name, value, when)))
> ++        self.tasks_debug_out("ConfigureSandbox.set_define_impl / %s(%s)" % (name, value))
> +
> +     def imply_option_impl(self, option, value, reason=None, when=None):
> +         '''Implementation of imply_option().
> +@@ -922,7 +955,7 @@ class ConfigureSandbox(dict):
> +                 if isinstance(possible_reasons[0], Option):
> +                     reason = possible_reasons[0]
> +         if not reason and (isinstance(value, (bool, tuple)) or
> +-                           isinstance(value, types.StringTypes)):
> ++                           isinstance(value, (str,))):
> +             # A reason can be provided automatically when imply_option
> +             # is called with an immediate value.
> +             _, filename, line, _, _, _ = inspect.stack()[1]
> +@@ -955,10 +988,10 @@ class ConfigureSandbox(dict):
> +         if not inspect.isfunction(func):
> +             raise TypeError("Unexpected type: '%s'" % type(func).__name__)
> +         if func in self._prepared_functions:
> +-            return func, func.func_globals
> ++            return func, func.__globals__
> +
> +         glob = SandboxedGlobal(
> +-            (k, v) for k, v in func.func_globals.iteritems()
> ++            (k, v) for k, v in func.__globals__.items()
> +             if (inspect.isfunction(v) and v not in self._templates) or (
> +                 inspect.isclass(v) and issubclass(v, Exception))
> +         )
> +@@ -979,20 +1012,20 @@ class ConfigureSandbox(dict):
> +         # Note this is not entirely bullet proof (if the value is e.g. a list,
> +         # the list contents could have changed), but covers the bases.
> +         closure = None
> +-        if func.func_closure:
> ++        if func.__closure__:
> +             def makecell(content):
> +                 def f():
> +                     content
> +-                return f.func_closure[0]
> ++                return f.__closure__[0]
> +
> +             closure = tuple(makecell(cell.cell_contents)
> +-                            for cell in func.func_closure)
> ++                            for cell in func.__closure__)
> +
> +         new_func = self.wraps(func)(types.FunctionType(
> +-            func.func_code,
> ++            func.__code__,
> +             glob,
> +             func.__name__,
> +-            func.func_defaults,
> ++            func.__defaults__,
> +             closure
> +         ))
> +         @self.wraps(new_func)
> +diff --git a/python/mozbuild/mozbuild/configure/check_debug_ranges.py b/python/mozbuild/mozbuild/configure/check_debug_ranges.py
> +index c0caa9cc5..a3e1f37e1 100644
> +--- a/python/mozbuild/mozbuild/configure/check_debug_ranges.py
> ++++ b/python/mozbuild/mozbuild/configure/check_debug_ranges.py
> +@@ -6,7 +6,7 @@
> + # to a given compilation unit. This is used as a helper to find a bug in some
> + # versions of GNU ld.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import subprocess
> + import sys
> +@@ -45,6 +45,8 @@ def get_range_length(range, debug_ranges):
> + def main(bin, compilation_unit):
> +     p = subprocess.Popen(['objdump', '-W', bin], stdout = subprocess.PIPE, stderr = subprocess.PIPE)
> +     (out, err) = p.communicate()
> ++    if isinstance(out, bytes):
> ++        out = out.decode('utf-8')
> +     sections = re.split('\n(Contents of the|The section) ', out)
> +     debug_info = [s for s in sections if s.startswith('.debug_info')]
> +     debug_ranges = [s for s in sections if s.startswith('.debug_ranges')]
> +@@ -59,4 +61,4 @@ def main(bin, compilation_unit):
> +
> +
> + if __name__ == '__main__':
> +-    print(main(*sys.argv[1:]))
> ++    print((main(*sys.argv[1:])))
> +diff --git a/python/mozbuild/mozbuild/configure/options.py b/python/mozbuild/mozbuild/configure/options.py
> +index 53ae2ae6d..4d80cad86 100644
> +--- a/python/mozbuild/mozbuild/configure/options.py
> ++++ b/python/mozbuild/mozbuild/configure/options.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import os
> + import sys
> +@@ -12,7 +12,7 @@ from collections import OrderedDict
> +
> + def istupleofstrings(obj):
> +     return isinstance(obj, tuple) and len(obj) and all(
> +-        isinstance(o, types.StringTypes) for o in obj)
> ++        isinstance(o, (str,)) for o in obj)
> +
> +
> + class OptionValue(tuple):
> +@@ -88,7 +88,7 @@ class PositiveOptionValue(OptionValue):
> +     in the form of a tuple for when values are given to the option (in the form
> +     --option=value[,value2...].
> +     '''
> +-    def __nonzero__(self):
> ++    def __bool__(self):
> +         return True
> +
> +
> +@@ -113,7 +113,7 @@ class ConflictingOptionError(InvalidOptionError):
> +         if format_data:
> +             message = message.format(**format_data)
> +         super(ConflictingOptionError, self).__init__(message)
> +-        for k, v in format_data.iteritems():
> ++        for k, v in format_data.items():
> +             setattr(self, k, v)
> +
> +
> +@@ -149,7 +149,7 @@ class Option(object):
> +                 'At least an option name or an environment variable name must '
> +                 'be given')
> +         if name:
> +-            if not isinstance(name, types.StringTypes):
> ++            if not isinstance(name, (str,)):
> +                 raise InvalidOptionError('Option must be a string')
> +             if not name.startswith('--'):
> +                 raise InvalidOptionError('Option must start with `--`')
> +@@ -158,7 +158,7 @@ class Option(object):
> +             if not name.islower():
> +                 raise InvalidOptionError('Option must be all lowercase')
> +         if env:
> +-            if not isinstance(env, types.StringTypes):
> ++            if not isinstance(env, (str,)):
> +                 raise InvalidOptionError(
> +                     'Environment variable name must be a string')
> +             if not env.isupper():
> +@@ -168,8 +168,8 @@ class Option(object):
> +                 isinstance(nargs, int) and nargs >= 0):
> +             raise InvalidOptionError(
> +                 "nargs must be a positive integer, '?', '*' or '+'")
> +-        if (not isinstance(default, types.StringTypes) and
> +-                not isinstance(default, (bool, types.NoneType)) and
> ++        if (not isinstance(default, (str,)) and
> ++                not isinstance(default, (bool, type(None))) and
> +                 not istupleofstrings(default)):
> +             raise InvalidOptionError(
> +                 'default must be a bool, a string or a tuple of strings')
> +@@ -241,7 +241,7 @@ class Option(object):
> +                     ', '.join("'%s'" % c for c in choices))
> +         elif has_choices:
> +             maxargs = self.maxargs
> +-            if len(choices) < maxargs and maxargs != sys.maxint:
> ++            if len(choices) < maxargs and maxargs != sys.maxsize:
> +                 raise InvalidOptionError('Not enough `choices` for `nargs`')
> +         self.choices = choices
> +         self.help = help
> +@@ -255,7 +255,7 @@ class Option(object):
> +         where prefix is one of 'with', 'without', 'enable' or 'disable'.
> +         The '=values' part is optional. Values are separated with commas.
> +         '''
> +-        if not isinstance(option, types.StringTypes):
> ++        if not isinstance(option, (str,)):
> +             raise InvalidOptionError('Option must be a string')
> +
> +         elements = option.split('=', 1)
> +@@ -308,7 +308,7 @@ class Option(object):
> +     def maxargs(self):
> +         if isinstance(self.nargs, int):
> +             return self.nargs
> +-        return 1 if self.nargs == '?' else sys.maxint
> ++        return 1 if self.nargs == '?' else sys.maxsize
> +
> +     def _validate_nargs(self, num):
> +         minargs, maxargs = self.minargs, self.maxargs
> +@@ -499,5 +499,5 @@ class CommandLineHelper(object):
> +
> +     def __iter__(self):
> +         for d in (self._args, self._extra_args):
> +-            for arg, pos in d.itervalues():
> ++            for arg, pos in d.values():
> +                 yield arg
> +diff --git a/python/mozbuild/mozbuild/configure/util.py b/python/mozbuild/mozbuild/configure/util.py
> +index 9d8b2eb0e..a12986e48 100644
> +--- a/python/mozbuild/mozbuild/configure/util.py
> ++++ b/python/mozbuild/mozbuild/configure/util.py
> +@@ -77,15 +77,7 @@ class ConfigureOutputHandler(logging.Handler):
> +         # Python has this feature where it sets the encoding of pipes to
> +         # ascii, which blatantly fails when trying to print out non-ascii.
> +         def fix_encoding(fh):
> +-            try:
> +-                isatty = fh.isatty()
> +-            except AttributeError:
> +-                isatty = True
> +-
> +-            if not isatty:
> +-                encoding = getpreferredencoding()
> +-                if encoding:
> +-                    return codecs.getwriter(encoding)(fh)
> ++            # no magic on oe / python3
> +             return fh
> +
> +         self._stdout = fix_encoding(stdout)
> +@@ -200,7 +192,7 @@ class LineIO(object):
> +         self._errors = errors
> +
> +     def write(self, buf):
> +-        if self._encoding and isinstance(buf, str):
> ++        if self._encoding and isinstance(buf, bytes):
> +             buf = buf.decode(self._encoding, self._errors)
> +         lines = buf.splitlines()
> +         if not lines:
> +diff --git a/python/mozbuild/mozbuild/controller/building.py b/python/mozbuild/mozbuild/controller/building.py
> +index d5af532f7..e9810fe58 100644
> +--- a/python/mozbuild/mozbuild/controller/building.py
> ++++ b/python/mozbuild/mozbuild/controller/building.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import errno
> + import getpass
> +@@ -146,7 +146,7 @@ class TierStatus(object):
> +         """
> +         o = []
> +
> +-        for tier, state in self.tiers.items():
> ++        for tier, state in list(self.tiers.items()):
> +             t_entry = dict(
> +                 name=tier,
> +                 start=state['begin_time'],
> +@@ -574,7 +574,7 @@ class BuildProgressFooter(Footer):
> +
> +     def __init__(self, terminal, monitor):
> +         Footer.__init__(self, terminal)
> +-        self.tiers = monitor.tiers.tier_status.viewitems()
> ++        self.tiers = monitor.tiers.tier_status.items()
> +
> +     def draw(self):
> +         """Draws this footer in the terminal."""
> +@@ -911,8 +911,8 @@ class CCacheStats(object):
> +
> +         return '\n'.join(lines)
> +
> +-    def __nonzero__(self):
> +-        relative_values = [v for k, v in self._values.items()
> ++    def __bool__(self):
> ++        relative_values = [v for k, v in list(self._values.items())
> +                            if k not in self.ABSOLUTE_KEYS]
> +         return (all(v >= 0 for v in relative_values) and
> +                 any(v > 0 for v in relative_values))
> +@@ -1156,7 +1156,7 @@ class BuildDriver(MozbuildObject):
> +
> +         high_finder, finder_percent = monitor.have_high_finder_usage()
> +         if high_finder:
> +-            print(FINDER_SLOW_MESSAGE % finder_percent)
> ++            print((FINDER_SLOW_MESSAGE % finder_percent))
> +
> +         ccache_end = monitor.ccache_stats()
> +
> +@@ -1276,8 +1276,8 @@ class BuildDriver(MozbuildObject):
> +         """Install test files."""
> +
> +         if self.is_clobber_needed():
> +-            print(INSTALL_TESTS_CLOBBER.format(
> +-                  clobber_file=os.path.join(self.topobjdir, 'CLOBBER')))
> ++            print((INSTALL_TESTS_CLOBBER.format(
> ++                  clobber_file=os.path.join(self.topobjdir, 'CLOBBER'))))
> +             sys.exit(1)
> +
> +         if not test_objs:
> +diff --git a/python/mozbuild/mozbuild/frontend/context.py b/python/mozbuild/mozbuild/frontend/context.py
> +index fbdbefc1d..1aef6a65a 100644
> +--- a/python/mozbuild/mozbuild/frontend/context.py
> ++++ b/python/mozbuild/mozbuild/frontend/context.py
> +@@ -14,7 +14,7 @@ If you are looking for the absolute authority on what moz.build files can
> + contain, you've come to the right place.
> + """
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import os
> +
> +@@ -237,15 +237,15 @@ class Context(KeyedDefaultDict):
> +         This function is transactional: if setitem fails for one of the values,
> +         the context is not updated at all."""
> +         if isinstance(iterable, dict):
> +-            iterable = iterable.items()
> ++            iterable = list(iterable.items())
> +
> +         update = {}
> +-        for key, value in itertools.chain(iterable, kwargs.items()):
> ++        for key, value in itertools.chain(iterable, list(kwargs.items())):
> +             stored_type = self._validate(key, value)
> +             # Don't create an instance of stored_type if coercion is needed,
> +             # until all values are validated.
> +             update[key] = (value, stored_type)
> +-        for key, (value, stored_type) in update.items():
> ++        for key, (value, stored_type) in list(update.items()):
> +             if not isinstance(value, stored_type):
> +                 update[key] = stored_type(value)
> +             else:
> +@@ -311,7 +311,7 @@ class BaseCompileFlags(ContextDerivedValue, dict):
> +         # a template were set and which were provided as defaults.
> +         template_name = getattr(context, 'template', None)
> +         if template_name in (None, 'Gyp'):
> +-            dict.__init__(self, ((k, v if v is None else TypedList(unicode)(v))
> ++            dict.__init__(self, ((k, v if v is None else TypedList(str)(v))
> +                                  for k, v, _ in self.flag_variables))
> +         else:
> +             dict.__init__(self)
> +@@ -520,13 +520,13 @@ class CompileFlags(BaseCompileFlags):
> +         if key in self and self[key] is None:
> +             raise ValueError('`%s` may not be set in COMPILE_FLAGS from moz.build, this '
> +                              'value is resolved from the emitter.' % key)
> +-        if not (isinstance(value, list) and all(isinstance(v, basestring) for v in value)):
> ++        if not (isinstance(value, list) and all(isinstance(v, str) for v in value)):
> +             raise ValueError('A list of strings must be provided as a value for a '
> +                              'compile flags category.')
> +         dict.__setitem__(self, key, value)
> +
> +
> +-class FinalTargetValue(ContextDerivedValue, unicode):
> ++class FinalTargetValue(ContextDerivedValue, str):
> +     def __new__(cls, context, value=""):
> +         if not value:
> +             value = 'dist/'
> +@@ -536,7 +536,7 @@ class FinalTargetValue(ContextDerivedValue, unicode):
> +                 value += 'bin'
> +             if context['DIST_SUBDIR']:
> +                 value += '/' + context['DIST_SUBDIR']
> +-        return unicode.__new__(cls, value)
> ++        return str.__new__(cls, value)
> +
> +
> + def Enum(*values):
> +@@ -584,7 +584,7 @@ class PathMeta(type):
> +                 cls = SourcePath
> +         return super(PathMeta, cls).__call__(context, value)
> +
> +-class Path(ContextDerivedValue, unicode):
> ++class Path(ContextDerivedValue, str, metaclass=PathMeta):
> +     """Stores and resolves a source path relative to a given context
> +
> +     This class is used as a backing type for some of the sandbox variables.
> +@@ -595,7 +595,6 @@ class Path(ContextDerivedValue, unicode):
> +       - '!objdir/relative/paths'
> +       - '%/filesystem/absolute/paths'
> +     """
> +-    __metaclass__ = PathMeta
> +
> +     def __new__(cls, context, value=None):
> +         return super(Path, cls).__new__(cls, value)
> +@@ -612,10 +611,14 @@ class Path(ContextDerivedValue, unicode):
> +         """
> +         return Path(self.context, mozpath.join(self, *p))
> +
> ++    @staticmethod
> ++    def cmp(a, b):
> ++        return (a > b) - (a < b)
> ++
> +     def __cmp__(self, other):
> +         if isinstance(other, Path) and self.srcdir != other.srcdir:
> +-            return cmp(self.full_path, other.full_path)
> +-        return cmp(unicode(self), other)
> ++            return self.cmp(self.full_path, other.full_path)
> ++        return self.cmp(str(self), other)
> +
> +     # __cmp__ is not enough because unicode has __eq__, __ne__, etc. defined
> +     # and __cmp__ is only used for those when they don't exist.
> +@@ -773,7 +776,7 @@ def ContextDerivedTypedRecord(*fields):
> +         __slots__ = tuple([name for name, _ in fields])
> +
> +         def __init__(self, context):
> +-            for fname, ftype in self._fields.items():
> ++            for fname, ftype in list(self._fields.items()):
> +                 if issubclass(ftype, ContextDerivedValue):
> +                     setattr(self, fname, self._fields[fname](context))
> +                 else:
> +@@ -909,8 +912,8 @@ def TypedListWithAction(typ, action):
> +     return _TypedListWithAction
> +
> + WebPlatformTestManifest = TypedNamedTuple("WebPlatformTestManifest",
> +-                                          [("manifest_path", unicode),
> +-                                           ("test_root", unicode)])
> ++                                          [("manifest_path", str),
> ++                                           ("test_root", str)])
> + ManifestparserManifestList = OrderedPathListWithAction(read_manifestparser_manifest)
> + ReftestManifestList = OrderedPathListWithAction(read_reftest_manifest)
> + WptManifestList = TypedListWithAction(WebPlatformTestManifest, read_wpt_manifest)
> +@@ -918,18 +921,18 @@ WptManifestList = TypedListWithAction(WebPlatformTestManifest, read_wpt_manifest
> + OrderedSourceList = ContextDerivedTypedList(SourcePath, StrictOrderingOnAppendList)
> + OrderedTestFlavorList = TypedList(Enum(*all_test_flavors()),
> +                                   StrictOrderingOnAppendList)
> +-OrderedStringList = TypedList(unicode, StrictOrderingOnAppendList)
> ++OrderedStringList = TypedList(str, StrictOrderingOnAppendList)
> + DependentTestsEntry = ContextDerivedTypedRecord(('files', OrderedSourceList),
> +                                                 ('tags', OrderedStringList),
> +                                                 ('flavors', OrderedTestFlavorList))
> + BugzillaComponent = TypedNamedTuple('BugzillaComponent',
> +-                        [('product', unicode), ('component', unicode)])
> ++                        [('product', str), ('component', str)])
> + SchedulingComponents = ContextDerivedTypedRecord(
> +-        ('inclusive', TypedList(unicode, StrictOrderingOnAppendList)),
> +-        ('exclusive', TypedList(unicode, StrictOrderingOnAppendList)))
> ++        ('inclusive', TypedList(str, StrictOrderingOnAppendList)),
> ++        ('exclusive', TypedList(str, StrictOrderingOnAppendList)))
> +
> + GeneratedFilesList = StrictOrderingOnAppendListWithFlagsFactory({
> +-    'script': unicode,
> ++    'script': str,
> +     'inputs': list,
> +     'flags': list, })
> +
> +@@ -1096,7 +1099,7 @@ class Files(SubContext):
> +         self.test_tags |= other.test_tags
> +         self.test_flavors |= other.test_flavors
> +
> +-        for k, v in other.items():
> ++        for k, v in list(other.items()):
> +             if k == 'IMPACTED_TESTS':
> +                 self.test_files |= set(mozpath.relpath(e.full_path, e.context.config.topsrcdir)
> +                                        for e in v.files)
> +@@ -1154,7 +1157,7 @@ class Files(SubContext):
> +
> +         bug_components = Counter()
> +
> +-        for f in files.values():
> ++        for f in list(files.values()):
> +             bug_component = f.get('BUG_COMPONENT')
> +             if bug_component:
> +                 bug_components[bug_component] += 1
> +@@ -1232,7 +1235,7 @@ VARIABLES = {
> +         RustLibrary template instead.
> +         """),
> +
> +-    'RUST_LIBRARY_TARGET_DIR': (unicode, unicode,
> ++    'RUST_LIBRARY_TARGET_DIR': (str, str,
> +         """Where CARGO_TARGET_DIR should point when compiling this library.  If
> +         not set, it defaults to the current objdir.  It should be a relative path
> +         to the current objdir; absolute paths should not be used.
> +@@ -1248,7 +1251,7 @@ VARIABLES = {
> +         HostRustLibrary template instead.
> +         """),
> +
> +-    'RUST_TEST': (unicode, unicode,
> ++    'RUST_TEST': (str, str,
> +         """Name of a Rust test to build and run via `cargo test`.
> +
> +         This variable should not be used directly; you should be using the
> +@@ -1487,7 +1490,7 @@ VARIABLES = {
> +         """Like ``OBJDIR_FILES``, with preprocessing. Use sparingly.
> +         """),
> +
> +-    'FINAL_LIBRARY': (unicode, unicode,
> ++    'FINAL_LIBRARY': (str, str,
> +         """Library in which the objects of the current directory will be linked.
> +
> +         This variable contains the name of a library, defined elsewhere with
> +@@ -1528,7 +1531,7 @@ VARIABLES = {
> +         with the host compiler.
> +         """),
> +
> +-    'HOST_LIBRARY_NAME': (unicode, unicode,
> ++    'HOST_LIBRARY_NAME': (str, str,
> +         """Name of target library generated when cross compiling.
> +         """),
> +
> +@@ -1546,7 +1549,7 @@ VARIABLES = {
> +         libraries that link into this library via FINAL_LIBRARY.
> +         """),
> +
> +-    'LIBRARY_NAME': (unicode, unicode,
> ++    'LIBRARY_NAME': (str, str,
> +         """The code name of the library generated for a directory.
> +
> +         By default STATIC_LIBRARY_NAME and SHARED_LIBRARY_NAME take this name.
> +@@ -1558,7 +1561,7 @@ VARIABLES = {
> +         ``example/components/xpcomsample.lib`` on Windows.
> +         """),
> +
> +-    'SHARED_LIBRARY_NAME': (unicode, unicode,
> ++    'SHARED_LIBRARY_NAME': (str, str,
> +         """The name of the static library generated for a directory, if it needs to
> +         differ from the library code name.
> +
> +@@ -1572,7 +1575,7 @@ VARIABLES = {
> +         Implies FORCE_SHARED_LIB.
> +         """),
> +
> +-    'STATIC_LIBRARY_NAME': (unicode, unicode,
> ++    'STATIC_LIBRARY_NAME': (str, str,
> +         """The name of the static library generated for a directory, if it needs to
> +         differ from the library code name.
> +
> +@@ -1604,31 +1607,31 @@ VARIABLES = {
> +
> +         This variable contains a list of system libaries to link against.
> +         """),
> +-    'RCFILE': (unicode, unicode,
> ++    'RCFILE': (str, str,
> +         """The program .rc file.
> +
> +         This variable can only be used on Windows.
> +         """),
> +
> +-    'RESFILE': (unicode, unicode,
> ++    'RESFILE': (str, str,
> +         """The program .res file.
> +
> +         This variable can only be used on Windows.
> +         """),
> +
> +-    'RCINCLUDE': (unicode, unicode,
> ++    'RCINCLUDE': (str, str,
> +         """The resource script file to be included in the default .res file.
> +
> +         This variable can only be used on Windows.
> +         """),
> +
> +-    'DEFFILE': (unicode, unicode,
> ++    'DEFFILE': (str, str,
> +         """The program .def (module definition) file.
> +
> +         This variable can only be used on Windows.
> +         """),
> +
> +-    'SYMBOLS_FILE': (Path, unicode,
> ++    'SYMBOLS_FILE': (Path, str,
> +         """A file containing a list of symbols to export from a shared library.
> +
> +         The given file contains a list of symbols to be exported, and is
> +@@ -1649,7 +1652,7 @@ VARIABLES = {
> +         ``BIN_SUFFIX``, the name will remain unchanged.
> +         """),
> +
> +-    'SONAME': (unicode, unicode,
> ++    'SONAME': (str, str,
> +         """The soname of the shared object currently being linked
> +
> +         soname is the "logical name" of a shared object, often used to provide
> +@@ -1719,7 +1722,7 @@ VARIABLES = {
> +         ``GENERATED_FILES``.
> +         """),
> +
> +-    'PROGRAM' : (unicode, unicode,
> ++    'PROGRAM' : (str, str,
> +         """Compiled executable name.
> +
> +         If the configuration token ``BIN_SUFFIX`` is set, its value will be
> +@@ -1727,7 +1730,7 @@ VARIABLES = {
> +         ``BIN_SUFFIX``, ``PROGRAM`` will remain unchanged.
> +         """),
> +
> +-    'HOST_PROGRAM' : (unicode, unicode,
> ++    'HOST_PROGRAM' : (str, str,
> +         """Compiled host executable name.
> +
> +         If the configuration token ``HOST_BIN_SUFFIX`` is set, its value will be
> +@@ -1765,7 +1768,7 @@ VARIABLES = {
> +         files.
> +         """),
> +
> +-    'XPIDL_MODULE': (unicode, unicode,
> ++    'XPIDL_MODULE': (str, str,
> +         """XPCOM Interface Definition Module Name.
> +
> +         This is the name of the ``.xpt`` file that is created by linking
> +@@ -1924,14 +1927,14 @@ VARIABLES = {
> +
> +
> +     # The following variables are used to control the target of installed files.
> +-    'XPI_NAME': (unicode, unicode,
> ++    'XPI_NAME': (str, str,
> +         """The name of an extension XPI to generate.
> +
> +         When this variable is present, the results of this directory will end up
> +         being packaged into an extension instead of the main dist/bin results.
> +         """),
> +
> +-    'DIST_SUBDIR': (unicode, unicode,
> ++    'DIST_SUBDIR': (str, str,
> +         """The name of an alternate directory to install files to.
> +
> +         When this variable is present, the results of this directory will end up
> +@@ -1939,7 +1942,7 @@ VARIABLES = {
> +         otherwise be placed.
> +         """),
> +
> +-    'FINAL_TARGET': (FinalTargetValue, unicode,
> ++    'FINAL_TARGET': (FinalTargetValue, str,
> +         """The name of the directory to install targets to.
> +
> +         The directory is relative to the top of the object directory. The
> +@@ -1970,7 +1973,7 @@ VARIABLES = {
> +
> +     'GYP_DIRS': (StrictOrderingOnAppendListWithFlagsFactory({
> +             'variables': dict,
> +-            'input': unicode,
> ++            'input': str,
> +             'sandbox_vars': dict,
> +             'no_chromium': bool,
> +             'no_unified': bool,
> +@@ -2194,7 +2197,7 @@ VARIABLES = {
> + }
> +
> + # Sanity check: we don't want any variable above to have a list as storage type.
> +-for name, (storage_type, input_types, docs) in VARIABLES.items():
> ++for name, (storage_type, input_types, docs) in list(VARIABLES.items()):
> +     if storage_type == list:
> +         raise RuntimeError('%s has a "list" storage type. Use "List" instead.'
> +             % name)
> +diff --git a/python/mozbuild/mozbuild/frontend/data.py b/python/mozbuild/mozbuild/frontend/data.py
> +index 442fc9e0a..837453a9f 100644
> +--- a/python/mozbuild/mozbuild/frontend/data.py
> ++++ b/python/mozbuild/mozbuild/frontend/data.py
> +@@ -15,7 +15,7 @@ contains the code for converting executed mozbuild files into these data
> + structures.
> + """
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + from mozbuild.util import StrictOrderingOnAppendList
> + from mozpack.chrome.manifest import ManifestEntry
> +@@ -182,7 +182,7 @@ class ComputedFlags(ContextDerived):
> +             if value:
> +                 for dest_var in dest_vars:
> +                     flags[dest_var].extend(value)
> +-        return flags.items()
> ++        return list(flags.items())
> +
> + class XPIDLFile(ContextDerived):
> +     """Describes an XPIDL file to be compiled."""
> +@@ -213,7 +213,7 @@ class BaseDefines(ContextDerived):
> +         self.defines = defines
> +
> +     def get_defines(self):
> +-        for define, value in self.defines.iteritems():
> ++        for define, value in self.defines.items():
> +             if value is True:
> +                 yield('-D%s' % define)
> +             elif value is False:
> +@@ -494,7 +494,7 @@ class SimpleProgram(BaseProgram):
> +     KIND = 'target'
> +
> +     def source_files(self):
> +-        for srcs in self.sources.values():
> ++        for srcs in list(self.sources.values()):
> +             for f in srcs:
> +                 if mozpath.basename(mozpath.splitext(f)[0]) == mozpath.splitext(self.program)[0]:
> +                     return [f]
> +diff --git a/python/mozbuild/mozbuild/frontend/emitter.py b/python/mozbuild/mozbuild/frontend/emitter.py
> +index 642b381c0..c28344a75 100644
> +--- a/python/mozbuild/mozbuild/frontend/emitter.py
> ++++ b/python/mozbuild/mozbuild/frontend/emitter.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import itertools
> + import logging
> +@@ -116,8 +116,8 @@ class TreeMetadataEmitter(LoggingMixin):
> +         # arguments. This gross hack works around the problem until we
> +         # rid ourselves of 2.6.
> +         self.info = {}
> +-        for k, v in mozinfo.info.items():
> +-            if isinstance(k, unicode):
> ++        for k, v in list(mozinfo.info.items()):
> ++            if isinstance(k, str):
> +                 k = k.encode('ascii')
> +             self.info[k] = v
> +
> +@@ -234,7 +234,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +
> +
> +         # Next do FINAL_LIBRARY linkage.
> +-        for lib in (l for libs in self._libs.values() for l in libs):
> ++        for lib in (l for libs in list(self._libs.values()) for l in libs):
> +             if not isinstance(lib, (StaticLibrary, RustLibrary)) or not lib.link_into:
> +                 continue
> +             if lib.link_into not in self._libs:
> +@@ -294,13 +294,13 @@ class TreeMetadataEmitter(LoggingMixin):
> +                         lib.link_into == outerlib.basename):
> +                     propagate_defines(lib, defines)
> +
> +-        for lib in (l for libs in self._libs.values() for l in libs):
> ++        for lib in (l for libs in list(self._libs.values()) for l in libs):
> +             if isinstance(lib, Library):
> +                 propagate_defines(lib, lib.lib_defines)
> +             yield lib
> +
> +
> +-        for lib in (l for libs in self._libs.values() for l in libs):
> ++        for lib in (l for libs in list(self._libs.values()) for l in libs):
> +             lib_defines = list(lib.lib_defines.get_defines())
> +             if lib_defines:
> +                 objdir_flags = self._compile_flags[lib.objdir]
> +@@ -310,13 +310,13 @@ class TreeMetadataEmitter(LoggingMixin):
> +                 if objdir_flags:
> +                     objdir_flags.resolve_flags('LIBRARY_DEFINES', lib_defines)
> +
> +-        for flags_obj in self._compile_flags.values():
> ++        for flags_obj in list(self._compile_flags.values()):
> +             yield flags_obj
> +
> +-        for flags_obj in self._compile_as_flags.values():
> ++        for flags_obj in list(self._compile_as_flags.values()):
> +             yield flags_obj
> +
> +-        for obj in self._binaries.values():
> ++        for obj in list(self._binaries.values()):
> +             yield obj
> +
> +
> +@@ -409,7 +409,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +                         libs[key] = l
> +                     if key not in libs:
> +                         libs[key] = l
> +-            candidates = libs.values()
> ++            candidates = list(libs.values())
> +             if force_static and not candidates:
> +                 if dir:
> +                     raise SandboxValidationError(
> +@@ -473,9 +473,9 @@ class TreeMetadataEmitter(LoggingMixin):
> +
> +     def _verify_deps(self, context, crate_dir, crate_name, dependencies, description='Dependency'):
> +         """Verify that a crate's dependencies all specify local paths."""
> +-        for dep_crate_name, values in dependencies.iteritems():
> ++        for dep_crate_name, values in dependencies.items():
> +             # A simple version number.
> +-            if isinstance(values, (str, unicode)):
> ++            if isinstance(values, str):
> +                 raise SandboxValidationError(
> +                     '%s %s of crate %s does not list a path' % (description, dep_crate_name, crate_name),
> +                     context)
> +@@ -529,7 +529,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +
> +         cargo_target_dir = context.get('RUST_LIBRARY_TARGET_DIR', '.')
> +
> +-        dependencies = set(config.get('dependencies', {}).iterkeys())
> ++        dependencies = set(config.get('dependencies', {}).keys())
> +
> +         features = context.get(cls.FEATURES_VAR, [])
> +         unique_features = set(features)
> +@@ -863,7 +863,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +         assert not gen_sources['UNIFIED_SOURCES']
> +
> +         no_pgo = context.get('NO_PGO')
> +-        no_pgo_sources = [f for f, flags in all_flags.iteritems()
> ++        no_pgo_sources = [f for f, flags in all_flags.items()
> +                           if flags.no_pgo]
> +         if no_pgo:
> +             if no_pgo_sources:
> +@@ -890,7 +890,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +
> +         # The inverse of the above, mapping suffixes to their canonical suffix.
> +         canonicalized_suffix_map = {}
> +-        for suffix, alternatives in suffix_map.iteritems():
> ++        for suffix, alternatives in suffix_map.items():
> +             alternatives.add(suffix)
> +             for a in alternatives:
> +                 canonicalized_suffix_map[a] = suffix
> +@@ -914,7 +914,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +         # Source files to track for linkables associated with this context.
> +         ctxt_sources = defaultdict(lambda: defaultdict(list))
> +
> +-        for variable, (klass, gen_klass, suffixes) in varmap.items():
> ++        for variable, (klass, gen_klass, suffixes) in list(varmap.items()):
> +             allowed_suffixes = set().union(*[suffix_map[s] for s in suffixes])
> +
> +             # First ensure that we haven't been given filetypes that we don't
> +@@ -941,20 +941,20 @@ class TreeMetadataEmitter(LoggingMixin):
> +                     obj = cls(*arglist)
> +                     srcs = obj.files
> +                     if isinstance(obj, UnifiedSources) and obj.have_unified_mapping:
> +-                        srcs = dict(obj.unified_source_mapping).keys()
> ++                        srcs = list(dict(obj.unified_source_mapping).keys())
> +                     ctxt_sources[variable][canonical_suffix] += sorted(srcs)
> +                     yield obj
> +
> +         if ctxt_sources:
> +             for linkable in linkables:
> +                 for target_var in ('SOURCES', 'UNIFIED_SOURCES'):
> +-                    for suffix, srcs in ctxt_sources[target_var].items():
> ++                    for suffix, srcs in list(ctxt_sources[target_var].items()):
> +                         linkable.sources[suffix] += srcs
> +             for host_linkable in host_linkables:
> +-                for suffix, srcs in ctxt_sources['HOST_SOURCES'].items():
> ++                for suffix, srcs in list(ctxt_sources['HOST_SOURCES'].items()):
> +                     host_linkable.sources[suffix] += srcs
> +
> +-        for f, flags in all_flags.iteritems():
> ++        for f, flags in all_flags.items():
> +             if flags.flags:
> +                 ext = mozpath.splitext(f)[1]
> +                 yield PerSourceFlag(context, f, flags.flags)
> +@@ -1143,7 +1143,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +         for obj in self._handle_linkables(context, passthru, generated_files):
> +             yield obj
> +
> +-        generated_files.update(['%s%s' % (k, self.config.substs.get('BIN_SUFFIX', '')) for k in self._binaries.keys()])
> ++        generated_files.update(['%s%s' % (k, self.config.substs.get('BIN_SUFFIX', '')) for k in list(self._binaries.keys())])
> +
> +         components = []
> +         for var, cls in (
> +@@ -1277,7 +1277,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +         for obj in self._process_jar_manifests(context):
> +             yield obj
> +
> +-        for name, jar in context.get('JAVA_JAR_TARGETS', {}).items():
> ++        for name, jar in list(context.get('JAVA_JAR_TARGETS', {}).items()):
> +             yield ContextWrapped(context, jar)
> +
> +         computed_as_flags.resolve_flags('MOZBUILD',
> +@@ -1346,7 +1346,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +             script = mozpath.join(mozpath.dirname(mozpath.dirname(__file__)),
> +                                   'action', 'process_define_files.py')
> +             yield GeneratedFile(context, script, 'process_define_file',
> +-                                unicode(path),
> ++                                str(path),
> +                                 [Path(context, path + '.in')])
> +
> +         generated_files = context.get('GENERATED_FILES') or []
> +@@ -1393,7 +1393,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +                                     flags.flags, localized=localized)
> +
> +     def _process_test_manifests(self, context):
> +-        for prefix, info in TEST_MANIFESTS.items():
> ++        for prefix, info in list(TEST_MANIFESTS.items()):
> +             for path, manifest in context.get('%s_MANIFESTS' % prefix, []):
> +                 for obj in self._process_test_manifest(context, info, path, manifest):
> +                     yield obj
> +@@ -1479,7 +1479,7 @@ class TreeMetadataEmitter(LoggingMixin):
> +
> +                 process_support_files(test)
> +
> +-            for path, m_defaults in mpmanifest.manifest_defaults.items():
> ++            for path, m_defaults in list(mpmanifest.manifest_defaults.items()):
> +                 process_support_files(m_defaults)
> +
> +             # We also copy manifests into the output directory,
> +diff --git a/python/mozbuild/mozbuild/frontend/reader.py b/python/mozbuild/mozbuild/frontend/reader.py
> +index c1efc1c3d..0cdf8b8db 100644
> +--- a/python/mozbuild/mozbuild/frontend/reader.py
> ++++ b/python/mozbuild/mozbuild/frontend/reader.py
> +@@ -16,7 +16,7 @@ The BuildReader contains basic logic for traversing a tree of mozbuild files.
> + It does this by examining specific variables populated during execution.
> + """
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import ast
> + import inspect
> +@@ -81,12 +81,13 @@ from .context import (
> +
> + from mozbuild.base import ExecutionSummary
> + from concurrent.futures.process import ProcessPoolExecutor
> ++from functools import reduce
> +
> +
> +
> + if sys.version_info.major == 2:
> +-    text_type = unicode
> +-    type_type = types.TypeType
> ++    text_type = str
> ++    type_type = type
> + else:
> +     text_type = str
> +     type_type = type
> +@@ -127,7 +128,7 @@ class EmptyConfig(object):
> +
> +         self.substs = self.PopulateOnGetDict(EmptyValue, substs or self.default_substs)
> +         udict = {}
> +-        for k, v in self.substs.items():
> ++        for k, v in list(self.substs.items()):
> +             if isinstance(v, str):
> +                 udict[k.decode('utf-8')] = v.decode('utf-8')
> +             else:
> +@@ -311,7 +312,7 @@ class MozbuildSandbox(Sandbox):
> +             raise Exception('`template` is a function decorator. You must '
> +                 'use it as `@template` preceding a function declaration.')
> +
> +-        name = func.func_name
> ++        name = func.__name__
> +
> +         if name in self.templates:
> +             raise KeyError(
> +@@ -390,7 +391,7 @@ class MozbuildSandbox(Sandbox):
> +             klass = self._context.__class__
> +             self._context.__class__ = TemplateContext
> +             # The sandbox will do all the necessary checks for these merges.
> +-            for key, value in context.items():
> ++            for key, value in list(context.items()):
> +                 if isinstance(value, dict):
> +                     self[key].update(value)
> +                 elif isinstance(value, (list, HierarchicalStringList)):
> +@@ -407,12 +408,14 @@ class MozbuildSandbox(Sandbox):
> +
> + class TemplateFunction(object):
> +     def __init__(self, func, sandbox):
> +-        self.path = func.func_code.co_filename
> +-        self.name = func.func_name
> ++        self.path = func.__code__.co_filename
> ++        self.name = func.__name__
> +
> +-        code = func.func_code
> ++        code = func.__code__
> +         firstlineno = code.co_firstlineno
> +         lines = sandbox._current_source.splitlines(True)
> ++        if len(lines) and isinstance(lines[0], bytes):
> ++            lines = [l.decode('utf-8') for l in lines]
> +         lines = inspect.getblock(lines[firstlineno - 1:])
> +
> +         # The code lines we get out of inspect.getsourcelines look like
> +@@ -430,7 +433,7 @@ class TemplateFunction(object):
> +         # actually never calls __getitem__ and __setitem__, so we need to
> +         # modify the AST so that accesses to globals are properly directed
> +         # to a dict.
> +-        self._global_name = b'_data' # AST wants str for this, not unicode
> ++        self._global_name = '_data'
> +         # In case '_data' is a name used for a variable in the function code,
> +         # prepend more underscores until we find an unused name.
> +         while (self._global_name in code.co_names or
> +@@ -449,8 +452,8 @@ class TemplateFunction(object):
> +             compile(func_ast, self.path, 'exec'),
> +             glob,
> +             self.name,
> +-            func.func_defaults,
> +-            func.func_closure,
> ++            func.__defaults__,
> ++            func.__closure__,
> +         )
> +         func()
> +
> +@@ -464,11 +467,11 @@ class TemplateFunction(object):
> +             '__builtins__': sandbox._builtins
> +         }
> +         func = types.FunctionType(
> +-            self._func.func_code,
> ++            self._func.__code__,
> +             glob,
> +             self.name,
> +-            self._func.func_defaults,
> +-            self._func.func_closure
> ++            self._func.__defaults__,
> ++            self._func.__closure__
> +         )
> +         sandbox.exec_function(func, args, kwargs, self.path,
> +                               becomes_current_path=False)
> +@@ -484,7 +487,7 @@ class TemplateFunction(object):
> +         def visit_Str(self, node):
> +             # String nodes we got from the AST parser are str, but we want
> +             # unicode literals everywhere, so transform them.
> +-            node.s = unicode(node.s)
> ++            node.s = str(node.s)
> +             return node
> +
> +         def visit_Name(self, node):
> +@@ -617,7 +620,7 @@ class BuildReaderError(Exception):
> +
> +             for l in traceback.format_exception(type(self.other), self.other,
> +                 self.trace):
> +-                s.write(unicode(l))
> ++                s.write(str(l))
> +
> +         return s.getvalue()
> +
> +@@ -767,7 +770,7 @@ class BuildReaderError(Exception):
> +             s.write('    %s\n' % inner.args[2])
> +             s.write('\n')
> +             close_matches = difflib.get_close_matches(inner.args[2],
> +-                                                      VARIABLES.keys(), 2)
> ++                                                      list(VARIABLES.keys()), 2)
> +             if close_matches:
> +                 s.write('Maybe you meant %s?\n' % ' or '.join(close_matches))
> +                 s.write('\n')
> +@@ -1152,7 +1155,7 @@ class BuildReader(object):
> +                         context)
> +                 non_unified_sources.add(source)
> +             action_overrides = {}
> +-            for action, script in gyp_dir.action_overrides.iteritems():
> ++            for action, script in gyp_dir.action_overrides.items():
> +                 action_overrides[action] = SourcePath(context, script)
> +
> +             gyp_processor = GypProcessor(context.config,
> +@@ -1188,7 +1191,7 @@ class BuildReader(object):
> +
> +                 recurse_info[d][key] = dict(sandbox.metadata[key])
> +
> +-        for path, child_metadata in recurse_info.items():
> ++        for path, child_metadata in list(recurse_info.items()):
> +             child_path = path.join('moz.build').full_path
> +
> +             # Ensure we don't break out of the topsrcdir. We don't do realpath
> +@@ -1279,7 +1282,7 @@ class BuildReader(object):
> +         # There is room to improve this code (and the code in
> +         # _find_relevant_mozbuilds) to better handle multiple files in the same
> +         # directory. Bug 1136966 tracks.
> +-        for path, mbpaths in relevants.items():
> ++        for path, mbpaths in list(relevants.items()):
> +             path_mozbuilds[path] = [mozpath.join(topsrcdir, p) for p in mbpaths]
> +
> +             for i, mbpath in enumerate(mbpaths[0:-1]):
> +@@ -1316,7 +1319,7 @@ class BuildReader(object):
> +             all_contexts.append(context)
> +
> +         result = {}
> +-        for path, paths in path_mozbuilds.items():
> ++        for path, paths in list(path_mozbuilds.items()):
> +             result[path] = reduce(lambda x, y: x + y, (contexts[p] for p in paths), [])
> +
> +         return result, all_contexts
> +@@ -1356,7 +1359,7 @@ class BuildReader(object):
> +
> +         r = {}
> +
> +-        for path, ctxs in paths.items():
> ++        for path, ctxs in list(paths.items()):
> +             # Should be normalized by read_relevant_mozbuilds.
> +             assert '\\' not in path
> +
> +diff --git a/python/mozbuild/mozbuild/frontend/sandbox.py b/python/mozbuild/mozbuild/frontend/sandbox.py
> +index b2090802e..6d94291ea 100644
> +--- a/python/mozbuild/mozbuild/frontend/sandbox.py
> ++++ b/python/mozbuild/mozbuild/frontend/sandbox.py
> +@@ -17,7 +17,7 @@ KeyError are machine parseable. This machine-friendly data is used to present
> + user-friendly error messages in the case of errors.
> + """
> +
> +-from __future__ import absolute_import, unicode_literals
> ++
> +
> + import os
> + import sys
> +@@ -112,6 +112,7 @@ class Sandbox(dict):
> +         'int': int,
> +         'set': set,
> +         'tuple': tuple,
> ++        'str': str,
> +     })
> +
> +     def __init__(self, context, finder=default_finder):
> +diff --git a/python/mozbuild/mozbuild/jar.py b/python/mozbuild/mozbuild/jar.py
> +index 47a2eff63..96aea63ce 100644
> +--- a/python/mozbuild/mozbuild/jar.py
> ++++ b/python/mozbuild/mozbuild/jar.py
> +@@ -8,7 +8,7 @@ processing jar.mn files.
> + See the documentation for jar.mn on MDC for further details on the format.
> + '''
> +
> +-from __future__ import absolute_import
> ++
> +
> + import sys
> + import os
> +@@ -17,7 +17,7 @@ import re
> + import logging
> + from time import localtime
> + from MozZipFile import ZipFile
> +-from cStringIO import StringIO
> ++from io import StringIO
> + from collections import defaultdict
> +
> + from mozbuild.preprocessor import Preprocessor
> +@@ -302,9 +302,9 @@ class JarMaker(object):
> +         '''updateManifest replaces the % in the chrome registration entries
> +         with the given chrome base path, and updates the given manifest file.
> +         '''
> +-        myregister = dict.fromkeys(map(lambda s: s.replace('%',
> +-            chromebasepath), register))
> +-        addEntriesToListFile(manifestPath, myregister.iterkeys())
> ++        myregister = dict.fromkeys([s.replace('%',
> ++            chromebasepath) for s in register])
> ++        addEntriesToListFile(manifestPath, iter(myregister.keys()))
> +
> +     def makeJar(self, infile, jardir):
> +         '''makeJar is the main entry point to JarMaker.
> +@@ -322,7 +322,7 @@ class JarMaker(object):
> +         elif self.relativesrcdir:
> +             self.localedirs = \
> +                 self.generateLocaleDirs(self.relativesrcdir)
> +-        if isinstance(infile, basestring):
> ++        if isinstance(infile, str):
> +             logging.info('processing ' + infile)
> +             self.sourcedirs.append(_normpath(os.path.dirname(infile)))
> +         pp = self.pp.clone()
> +diff --git a/python/mozbuild/mozbuild/makeutil.py b/python/mozbuild/mozbuild/makeutil.py
> +index fcd45bed2..f77c5d2c3 100644
> +--- a/python/mozbuild/mozbuild/makeutil.py
> ++++ b/python/mozbuild/mozbuild/makeutil.py
> +@@ -2,11 +2,10 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import os
> + import re
> +-from types import StringTypes
> + from collections import Iterable
> +
> +
> +@@ -66,7 +65,7 @@ class _SimpleOrderedSet(object):
> +         self._list = []
> +         self._set = set()
> +
> +-    def __nonzero__(self):
> ++    def __bool__(self):
> +         return bool(self._set)
> +
> +     def __iter__(self):
> +@@ -103,19 +102,19 @@ class Rule(object):
> +
> +     def add_targets(self, targets):
> +         '''Add additional targets to the rule.'''
> +-        assert isinstance(targets, Iterable) and not isinstance(targets, StringTypes)
> ++        assert isinstance(targets, Iterable) and not isinstance(targets, str)
> +         self._targets.update(targets)
> +         return self
> +
> +     def add_dependencies(self, deps):
> +         '''Add dependencies to the rule.'''
> +-        assert isinstance(deps, Iterable) and not isinstance(deps, StringTypes)
> ++        assert isinstance(deps, Iterable) and not isinstance(deps, str)
> +         self._dependencies.update(deps)
> +         return self
> +
> +     def add_commands(self, commands):
> +         '''Add commands to the rule.'''
> +-        assert isinstance(commands, Iterable) and not isinstance(commands, StringTypes)
> ++        assert isinstance(commands, Iterable) and not isinstance(commands, str)
> +         self._commands.extend(commands)
> +         return self
> +
> +@@ -139,13 +138,16 @@ class Rule(object):
> +         '''
> +         if not self._targets:
> +             return
> +-        fh.write('%s:' % ' '.join(self._targets))
> ++        wstring = '%s:' % ' '.join(self._targets)
> +         if self._dependencies:
> +-            fh.write(' %s' % ' '.join(self.dependencies()))
> +-        fh.write('\n')
> ++            wstring += ' %s' % ' '.join(self.dependencies())
> ++        wstring += '\n'
> +         for cmd in self._commands:
> +-            fh.write('\t%s\n' % cmd)
> +-
> ++            wstring += '\t%s\n' % cmd
> ++        try:
> ++            fh.write(wstring.encode('utf-8'))
> ++        except TypeError:
> ++            fh.write(wstring)
> +
> + # colon followed by anything except a slash (Windows path detection)
> + _depfilesplitter = re.compile(r':(?![\\/])')
> +diff --git a/python/mozbuild/mozbuild/mozinfo.py b/python/mozbuild/mozbuild/mozinfo.py
> +index 7e7ad1b2a..f03f20ba3 100755
> +--- a/python/mozbuild/mozbuild/mozinfo.py
> ++++ b/python/mozbuild/mozbuild/mozinfo.py
> +@@ -5,7 +5,7 @@
> + # This module produces a JSON file that provides basic build info and
> + # configuration metadata.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import os
> + import re
> +@@ -33,7 +33,7 @@ def build_dict(config, env=os.environ):
> +         d['mozconfig'] = config.mozconfig
> +
> +     # os
> +-    o = substs["OS_TARGET"]
> ++    o = str(substs["OS_TARGET"])
> +     known_os = {"Linux": "linux",
> +                 "WINNT": "win",
> +                 "Darwin": "mac",
> +@@ -148,7 +148,7 @@ def write_mozinfo(file, config, env=os.environ):
> +     and what keys are produced.
> +     """
> +     build_conf = build_dict(config, env)
> +-    if isinstance(file, basestring):
> +-        file = open(file, 'wb')
> ++    if isinstance(file, str):
> ++        file = open(file, 'w')
> +
> +     json.dump(build_conf, file, sort_keys=True, indent=4)
> +diff --git a/python/mozbuild/mozbuild/preprocessor.py b/python/mozbuild/mozbuild/preprocessor.py
> +index 6780b8b72..19e59884e 100644
> +--- a/python/mozbuild/mozbuild/preprocessor.py
> ++++ b/python/mozbuild/mozbuild/preprocessor.py
> +@@ -27,7 +27,8 @@ import os
> + import re
> + from optparse import OptionParser
> + import errno
> +-from makeutil import Makefile
> ++from .makeutil import Makefile
> ++from functools import reduce
> +
> + # hack around win32 mangling our line endings
> + # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65443
> +@@ -230,7 +231,7 @@ class Expression:
> +         def __repr__(self):
> +             return self.value.__repr__()
> +
> +-    class ParseError(StandardError):
> ++    class ParseError(Exception):
> +         """
> +         Error raised when parsing fails.
> +         It has two members, offset and content, which give the offset of the
> +@@ -278,7 +279,7 @@ class Preprocessor:
> +         self.context = Context()
> +         for k,v in {'FILE': '',
> +                     'LINE': 0,
> +-                    'DIRECTORY': os.path.abspath('.')}.iteritems():
> ++                    'DIRECTORY': os.path.abspath('.')}.items():
> +             self.context[k] = v
> +         self.actionLevel = 0
> +         self.disableLevel = 0
> +@@ -292,21 +293,21 @@ class Preprocessor:
> +         self.cmds = {}
> +         for cmd, level in {'define': 0,
> +                            'undef': 0,
> +-                           'if': sys.maxint,
> +-                           'ifdef': sys.maxint,
> +-                           'ifndef': sys.maxint,
> ++                           'if': sys.maxsize,
> ++                           'ifdef': sys.maxsize,
> ++                           'ifndef': sys.maxsize,
> +                            'else': 1,
> +                            'elif': 1,
> +                            'elifdef': 1,
> +                            'elifndef': 1,
> +-                           'endif': sys.maxint,
> ++                           'endif': sys.maxsize,
> +                            'expand': 0,
> +                            'literal': 0,
> +                            'filter': 0,
> +                            'unfilter': 0,
> +                            'include': 0,
> +                            'includesubst': 0,
> +-                           'error': 0}.iteritems():
> ++                           'error': 0}.items():
> +             self.cmds[cmd] = (level, getattr(self, 'do_' + cmd))
> +         self.out = sys.stdout
> +         self.setMarker(marker)
> +@@ -434,7 +435,7 @@ class Preprocessor:
> +         filteredLine = self.applyFilters(aLine)
> +         if filteredLine != aLine:
> +             self.actionLevel = 2
> +-        self.out.write(filteredLine)
> ++        self.out.write(filteredLine.encode('utf-8'))
> +
> +     def handleCommandLine(self, args, defaultToStdin = False):
> +         """
> +@@ -468,7 +469,7 @@ class Preprocessor:
> +                 raise Preprocessor.Error(self, "--depend doesn't work with stdout",
> +                                          None)
> +             try:
> +-                from makeutil import Makefile
> ++                from .makeutil import Makefile
> +             except:
> +                 raise Preprocessor.Error(self, "--depend requires the "
> +                                                "mozbuild.makeutil module", None)
> +@@ -683,7 +684,7 @@ class Preprocessor:
> +         current = dict(self.filters)
> +         for f in filters:
> +             current[f] = getattr(self, 'filter_' + f)
> +-        filterNames = current.keys()
> ++        filterNames = list(current.keys())
> +         filterNames.sort()
> +         self.filters = [(fn, current[fn]) for fn in filterNames]
> +         return
> +@@ -693,7 +694,7 @@ class Preprocessor:
> +         for f in filters:
> +             if f in current:
> +                 del current[f]
> +-        filterNames = current.keys()
> ++        filterNames = list(current.keys())
> +         filterNames.sort()
> +         self.filters = [(fn, current[fn]) for fn in filterNames]
> +         return
> +@@ -738,7 +739,7 @@ class Preprocessor:
> +         args can either be a file name, or a file-like object.
> +         Files should be opened, and will be closed after processing.
> +         """
> +-        isName = type(args) == str or type(args) == unicode
> ++        isName = type(args) == str or type(args) == str
> +         oldCheckLineNumbers = self.checkLineNumbers
> +         self.checkLineNumbers = False
> +         if isName:
> +diff --git a/python/mozbuild/mozbuild/shellutil.py b/python/mozbuild/mozbuild/shellutil.py
> +index 185a970ee..c0c15f8f2 100644
> +--- a/python/mozbuild/mozbuild/shellutil.py
> ++++ b/python/mozbuild/mozbuild/shellutil.py
> +@@ -15,7 +15,7 @@ def _tokens2re(**tokens):
> +     # which matches the pattern and captures it in a named match group.
> +     # The group names and patterns are given as arguments.
> +     all_tokens = '|'.join('(?P<%s>%s)' % (name, value)
> +-                          for name, value in tokens.iteritems())
> ++                          for name, value in tokens.items())
> +     nonescaped = r'(?<!\\)(?:%s)' % all_tokens
> +
> +     # The final pattern matches either the above pattern, or an escaped
> +@@ -96,7 +96,7 @@ class _ClineSplitter(object):
> +             self.cline = self.cline[m.end():]
> +
> +             match = {name: value
> +-                     for name, value in m.groupdict().items() if value}
> ++                     for name, value in list(m.groupdict().items()) if value}
> +             if 'quote' in match:
> +                 # " or ' start a quoted string
> +                 if match['quote'] == '"':
> +@@ -144,7 +144,7 @@ class _ClineSplitter(object):
> +             self._push(self.cline[:m.start()])
> +             self.cline = self.cline[m.end():]
> +             match = {name: value
> +-                     for name, value in m.groupdict().items() if value}
> ++                     for name, value in list(m.groupdict().items()) if value}
> +             if 'quote' in match:
> +                 # a double quote ends the quoted string, so go back to
> +                 # unquoted parsing
> +diff --git a/python/mozbuild/mozbuild/test/backend/test_recursivemake.py b/python/mozbuild/mozbuild/test/backend/test_recursivemake.py
> +index a05059f8a..355a96165 100644
> +--- a/python/mozbuild/mozbuild/test/backend/test_recursivemake.py
> ++++ b/python/mozbuild/mozbuild/test/backend/test_recursivemake.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import unicode_literals
> +
> +-import cPickle as pickle
> ++
> ++import pickle as pickle
> + import json
> + import os
> + import unittest
> +@@ -333,7 +333,7 @@ class TestRecursiveMakeBackend(BackendTester):
> +             ],
> +         }
> +
> +-        for var, val in expected.items():
> ++        for var, val in list(expected.items()):
> +             # print("test_variable_passthru[%s]" % (var))
> +             found = [str for str in lines if str.startswith(var)]
> +             self.assertEqual(found, val)
> +@@ -372,7 +372,7 @@ class TestRecursiveMakeBackend(BackendTester):
> +             ],
> +         }
> +
> +-        for var, val in expected.items():
> ++        for var, val in list(expected.items()):
> +             found = [str for str in lines if str.startswith(var)]
> +             self.assertEqual(found, val)
> +
> +@@ -563,7 +563,7 @@ class TestRecursiveMakeBackend(BackendTester):
> +
> +         # This is not the most robust test in the world, but it gets the job
> +         # done.
> +-        entries = [e for e in m._dests.keys() if '**' in e]
> ++        entries = [e for e in list(m._dests.keys()) if '**' in e]
> +         self.assertEqual(len(entries), 1)
> +         self.assertIn('support/**', entries[0])
> +
> +@@ -590,11 +590,11 @@ class TestRecursiveMakeBackend(BackendTester):
> +                          set(['child/test_sub.js',
> +                               'child/data/**',
> +                               'child/another-file.sjs']))
> +-        for key in test_installs.keys():
> ++        for key in list(test_installs.keys()):
> +             self.assertIn(key, test_installs)
> +
> +         synthesized_manifest = InstallManifest()
> +-        for item, installs in test_installs.items():
> ++        for item, installs in list(test_installs.items()):
> +             for install_info in installs:
> +                 if len(install_info) == 3:
> +                     synthesized_manifest.add_pattern_link(*install_info)
> +@@ -602,7 +602,7 @@ class TestRecursiveMakeBackend(BackendTester):
> +                     synthesized_manifest.add_link(*install_info)
> +
> +         self.assertEqual(len(synthesized_manifest), 3)
> +-        for item, info in synthesized_manifest._dests.items():
> ++        for item, info in list(synthesized_manifest._dests.items()):
> +             self.assertIn(item, m)
> +             self.assertEqual(info, m._dests[item])
> +
> +@@ -864,7 +864,7 @@ class TestRecursiveMakeBackend(BackendTester):
> +         expected[mozpath.join(env.topobjdir, 'final-target')] = [
> +             'FINAL_TARGET = $(DEPTH)/random-final-target'
> +         ]
> +-        for key, expected_rules in expected.iteritems():
> ++        for key, expected_rules in expected.items():
> +             backend_path = mozpath.join(key, 'backend.mk')
> +             lines = [l.strip() for l in open(backend_path, 'rt').readlines()[2:]]
> +             found = [str for str in lines if
> +diff --git a/python/mozbuild/mozbuild/test/configure/common.py b/python/mozbuild/mozbuild/test/configure/common.py
> +index 150c6e393..5e2c2afaa 100644
> +--- a/python/mozbuild/mozbuild/test/configure/common.py
> ++++ b/python/mozbuild/mozbuild/test/configure/common.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import copy
> + import errno
> +@@ -16,7 +16,7 @@ from mozbuild.configure import ConfigureSandbox
> + from mozbuild.util import ReadOnlyNamespace
> + from mozpack import path as mozpath
> +
> +-from StringIO import StringIO
> ++from io import StringIO
> + from which import WhichError
> +
> + from buildconfig import (
> +@@ -77,10 +77,10 @@ class ConfigureTestSandbox(ConfigureSandbox):
> +         self._search_path = environ.get('PATH', '').split(os.pathsep)
> +
> +         self._subprocess_paths = {
> +-            mozpath.abspath(k): v for k, v in paths.iteritems() if v
> ++            mozpath.abspath(k): v for k, v in paths.items() if v
> +         }
> +
> +-        paths = paths.keys()
> ++        paths = list(paths.keys())
> +
> +         environ = dict(environ)
> +         if 'CONFIG_SHELL' not in environ:
> +diff --git a/python/mozbuild/mozbuild/test/configure/lint.py b/python/mozbuild/mozbuild/test/configure/lint.py
> +index 98f5f4fe7..a549b4bcf 100644
> +--- a/python/mozbuild/mozbuild/test/configure/lint.py
> ++++ b/python/mozbuild/mozbuild/test/configure/lint.py
> +@@ -2,11 +2,11 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import os
> + import unittest
> +-from StringIO import StringIO
> ++from io import StringIO
> + from mozunit import main
> + from buildconfig import (
> +     topobjdir,
> +@@ -40,9 +40,7 @@ class LintMeta(type):
> +         return type.__new__(mcs, name, bases, attrs)
> +
> +
> +-class Lint(unittest.TestCase):
> +-    __metaclass__ = LintMeta
> +-
> ++class Lint(unittest.TestCase, metaclass=LintMeta):
> +     def setUp(self):
> +         self._curdir = os.getcwd()
> +         os.chdir(topobjdir)
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_checks_configure.py b/python/mozbuild/mozbuild/test/configure/test_checks_configure.py
> +index c60000bb2..07091c077 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_checks_configure.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_checks_configure.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> +
> +-from StringIO import StringIO
> ++
> ++from io import StringIO
> + import os
> + import sys
> + import textwrap
> +@@ -447,7 +447,7 @@ class TestChecksConfigure(unittest.TestCase):
> +             checking for a... %s
> +         ''' % self.OTHER_A))
> +
> +-        dirs = map(mozpath.dirname, (self.OTHER_A, self.KNOWN_A))
> ++        dirs = list(map(mozpath.dirname, (self.OTHER_A, self.KNOWN_A)))
> +         config, out, status = self.get_result(textwrap.dedent('''\
> +             check_prog("A", ("known-a",), paths=["%s"])
> +         ''' % os.pathsep.join(dirs)))
> +@@ -457,7 +457,7 @@ class TestChecksConfigure(unittest.TestCase):
> +             checking for a... %s
> +         ''' % self.OTHER_A))
> +
> +-        dirs = map(mozpath.dirname, (self.KNOWN_A, self.KNOWN_B))
> ++        dirs = list(map(mozpath.dirname, (self.KNOWN_A, self.KNOWN_B)))
> +         config, out, status = self.get_result(textwrap.dedent('''\
> +             check_prog("A", ("known-a",), paths=["%s", "%s"])
> +         ''' % (os.pathsep.join(dirs), self.OTHER_A)))
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_compile_checks.py b/python/mozbuild/mozbuild/test/configure/test_compile_checks.py
> +index b5be3bf2e..282000bb2 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_compile_checks.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_compile_checks.py
> +@@ -2,14 +2,14 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import os
> + import textwrap
> + import unittest
> + import mozpack.path as mozpath
> +
> +-from StringIO import StringIO
> ++from io import StringIO
> +
> + from buildconfig import topsrcdir
> + from common import ConfigureTestSandbox
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_configure.py b/python/mozbuild/mozbuild/test/configure/test_configure.py
> +index f37e2701f..eb0ca84fb 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_configure.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_configure.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> +
> +-from StringIO import StringIO
> ++
> ++from io import StringIO
> + import os
> + import sys
> + import textwrap
> +@@ -43,7 +43,7 @@ class TestConfigure(unittest.TestCase):
> +
> +         if '--help' in options:
> +             return out.getvalue(), config
> +-        self.assertEquals('', out.getvalue())
> ++        self.assertEqual('', out.getvalue())
> +         return config
> +
> +     def moz_configure(self, source):
> +@@ -55,7 +55,7 @@ class TestConfigure(unittest.TestCase):
> +     def test_defaults(self):
> +         config = self.get_config()
> +         self.maxDiff = None
> +-        self.assertEquals({
> ++        self.assertEqual({
> +             'CHOICES': NegativeOptionValue(),
> +             'DEFAULTED': PositiveOptionValue(('not-simple',)),
> +             'IS_GCC': NegativeOptionValue(),
> +@@ -71,9 +71,9 @@ class TestConfigure(unittest.TestCase):
> +     def test_help(self):
> +         help, config = self.get_config(['--help'], prog='configure')
> +
> +-        self.assertEquals({}, config)
> ++        self.assertEqual({}, config)
> +         self.maxDiff = None
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             'Usage: configure [options]\n'
> +             '\n'
> +             'Options: [defaults in brackets after descriptions]\n'
> +@@ -109,7 +109,7 @@ class TestConfigure(unittest.TestCase):
> +         ):
> +             self.assertNotIn('ENABLED_SIMPLE', config)
> +             self.assertIn('SIMPLE', config)
> +-            self.assertEquals(NegativeOptionValue(), config['SIMPLE'])
> ++            self.assertEqual(NegativeOptionValue(), config['SIMPLE'])
> +
> +         for config in (
> +                 self.get_config(['--enable-simple']),
> +@@ -117,7 +117,7 @@ class TestConfigure(unittest.TestCase):
> +         ):
> +             self.assertIn('ENABLED_SIMPLE', config)
> +             self.assertIn('SIMPLE', config)
> +-            self.assertEquals(PositiveOptionValue(), config['SIMPLE'])
> ++            self.assertEqual(PositiveOptionValue(), config['SIMPLE'])
> +             self.assertIs(config['SIMPLE'], config['ENABLED_SIMPLE'])
> +
> +         # --enable-simple doesn't take values.
> +@@ -135,7 +135,7 @@ class TestConfigure(unittest.TestCase):
> +                                 env={'MOZ_WITH_ENV': '1'}),
> +         ):
> +             self.assertIn('WITH_ENV', config)
> +-            self.assertEquals(NegativeOptionValue(), config['WITH_ENV'])
> ++            self.assertEqual(NegativeOptionValue(), config['WITH_ENV'])
> +
> +         for config in (
> +                 self.get_config(['--enable-with-env']),
> +@@ -145,7 +145,7 @@ class TestConfigure(unittest.TestCase):
> +                                 env={'MOZ_WITH_ENV': ''}),
> +         ):
> +             self.assertIn('WITH_ENV', config)
> +-            self.assertEquals(PositiveOptionValue(), config['WITH_ENV'])
> ++            self.assertEqual(PositiveOptionValue(), config['WITH_ENV'])
> +
> +         with self.assertRaises(InvalidOptionError):
> +             self.get_config(['--enable-with-env=value'])
> +@@ -160,23 +160,23 @@ class TestConfigure(unittest.TestCase):
> +             self.get_config(['--enable-values', '--disable-values']),
> +         ):
> +             self.assertIn(name, config)
> +-            self.assertEquals(NegativeOptionValue(), config[name])
> ++            self.assertEqual(NegativeOptionValue(), config[name])
> +
> +         for config in (
> +             self.get_config(['--enable-values']),
> +             self.get_config(['--disable-values', '--enable-values']),
> +         ):
> +             self.assertIn(name, config)
> +-            self.assertEquals(PositiveOptionValue(), config[name])
> ++            self.assertEqual(PositiveOptionValue(), config[name])
> +
> +         config = self.get_config(['--enable-values=foo'])
> +         self.assertIn(name, config)
> +-        self.assertEquals(PositiveOptionValue(('foo',)), config[name])
> ++        self.assertEqual(PositiveOptionValue(('foo',)), config[name])
> +
> +         config = self.get_config(['--enable-values=foo,bar'])
> +         self.assertIn(name, config)
> +         self.assertTrue(config[name])
> +-        self.assertEquals(PositiveOptionValue(('foo', 'bar')), config[name])
> ++        self.assertEqual(PositiveOptionValue(('foo', 'bar')), config[name])
> +
> +     def test_values2(self):
> +         self.test_values('VALUES2')
> +@@ -187,12 +187,12 @@ class TestConfigure(unittest.TestCase):
> +     def test_returned_default(self):
> +         config = self.get_config(['--enable-simple'])
> +         self.assertIn('DEFAULTED', config)
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             PositiveOptionValue(('simple',)), config['DEFAULTED'])
> +
> +         config = self.get_config(['--disable-simple'])
> +         self.assertIn('DEFAULTED', config)
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             PositiveOptionValue(('not-simple',)), config['DEFAULTED'])
> +
> +     def test_returned_choices(self):
> +@@ -200,13 +200,13 @@ class TestConfigure(unittest.TestCase):
> +             config = self.get_config(
> +                 ['--enable-values=alpha', '--returned-choices=%s' % val])
> +             self.assertIn('CHOICES', config)
> +-            self.assertEquals(PositiveOptionValue((val,)), config['CHOICES'])
> ++            self.assertEqual(PositiveOptionValue((val,)), config['CHOICES'])
> +
> +         for val in ('0', '1', '2'):
> +             config = self.get_config(
> +                 ['--enable-values=numeric', '--returned-choices=%s' % val])
> +             self.assertIn('CHOICES', config)
> +-            self.assertEquals(PositiveOptionValue((val,)), config['CHOICES'])
> ++            self.assertEqual(PositiveOptionValue((val,)), config['CHOICES'])
> +
> +         with self.assertRaises(InvalidOptionError):
> +             self.get_config(['--enable-values=numeric',
> +@@ -218,12 +218,12 @@ class TestConfigure(unittest.TestCase):
> +     def test_included(self):
> +         config = self.get_config(env={'CC': 'gcc'})
> +         self.assertIn('IS_GCC', config)
> +-        self.assertEquals(config['IS_GCC'], True)
> ++        self.assertEqual(config['IS_GCC'], True)
> +
> +         config = self.get_config(
> +             ['--enable-include=extra.configure', '--extra'])
> +         self.assertIn('EXTRA', config)
> +-        self.assertEquals(PositiveOptionValue(), config['EXTRA'])
> ++        self.assertEqual(PositiveOptionValue(), config['EXTRA'])
> +
> +         with self.assertRaises(InvalidOptionError):
> +             self.get_config(['--extra'])
> +@@ -231,7 +231,7 @@ class TestConfigure(unittest.TestCase):
> +     def test_template(self):
> +         config = self.get_config(env={'CC': 'gcc'})
> +         self.assertIn('CFLAGS', config)
> +-        self.assertEquals(config['CFLAGS'], ['-Werror=foobar'])
> ++        self.assertEqual(config['CFLAGS'], ['-Werror=foobar'])
> +
> +         config = self.get_config(env={'CC': 'clang'})
> +         self.assertNotIn('CFLAGS', config)
> +@@ -288,7 +288,7 @@ class TestConfigure(unittest.TestCase):
> +             sandbox
> +         )
> +
> +-        import __builtin__
> ++        import builtins
> +         self.assertIs(sandbox['foo'](), __builtin__)
> +
> +         exec_(textwrap.dedent('''
> +@@ -300,7 +300,7 @@ class TestConfigure(unittest.TestCase):
> +         )
> +
> +         f = sandbox['foo']()
> +-        self.assertEquals(f.name, os.devnull)
> ++        self.assertEqual(f.name, os.devnull)
> +         f.close()
> +
> +         # This unlocks the sandbox
> +@@ -336,8 +336,8 @@ class TestConfigure(unittest.TestCase):
> +         self.assertIs(sandbox['foo'](), sandbox)
> +
> +         # Nothing leaked from the function being executed
> +-        self.assertEquals(sandbox.keys(), ['__builtins__', 'foo'])
> +-        self.assertEquals(sandbox['__builtins__'], ConfigureSandbox.BUILTINS)
> ++        self.assertEqual(list(sandbox.keys()), ['__builtins__', 'foo'])
> ++        self.assertEqual(sandbox['__builtins__'], ConfigureSandbox.BUILTINS)
> +
> +         exec_(textwrap.dedent('''
> +             @template
> +@@ -354,7 +354,7 @@ class TestConfigure(unittest.TestCase):
> +         with self.assertRaises(NameError) as e:
> +             sandbox._depends[sandbox['bar']].result()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "global name 'sys' is not defined")
> +
> +     def test_apply_imports(self):
> +@@ -380,28 +380,28 @@ class TestConfigure(unittest.TestCase):
> +             sandbox
> +         )
> +
> +-        self.assertEquals(len(imports), 1)
> ++        self.assertEqual(len(imports), 1)
> +
> +     def test_os_path(self):
> +         config = self.get_config(['--with-imports=%s' % __file__])
> +         self.assertIn('HAS_ABSPATH', config)
> +-        self.assertEquals(config['HAS_ABSPATH'], True)
> ++        self.assertEqual(config['HAS_ABSPATH'], True)
> +         self.assertIn('HAS_GETATIME', config)
> +-        self.assertEquals(config['HAS_GETATIME'], True)
> ++        self.assertEqual(config['HAS_GETATIME'], True)
> +         self.assertIn('HAS_GETATIME2', config)
> +-        self.assertEquals(config['HAS_GETATIME2'], False)
> ++        self.assertEqual(config['HAS_GETATIME2'], False)
> +
> +     def test_template_call(self):
> +         config = self.get_config(env={'CC': 'gcc'})
> +         self.assertIn('TEMPLATE_VALUE', config)
> +-        self.assertEquals(config['TEMPLATE_VALUE'], 42)
> ++        self.assertEqual(config['TEMPLATE_VALUE'], 42)
> +         self.assertIn('TEMPLATE_VALUE_2', config)
> +-        self.assertEquals(config['TEMPLATE_VALUE_2'], 21)
> ++        self.assertEqual(config['TEMPLATE_VALUE_2'], 21)
> +
> +     def test_template_imports(self):
> +         config = self.get_config(['--enable-imports-in-template'])
> +         self.assertIn('PLATFORM', config)
> +-        self.assertEquals(config['PLATFORM'], sys.platform)
> ++        self.assertEqual(config['PLATFORM'], sys.platform)
> +
> +     def test_decorators(self):
> +         config = {}
> +@@ -419,27 +419,27 @@ class TestConfigure(unittest.TestCase):
> +             return self.get_config(*args, configure='set_config.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config(['--set-foo'])
> +         self.assertIn('FOO', config)
> +-        self.assertEquals(config['FOO'], True)
> ++        self.assertEqual(config['FOO'], True)
> +
> +         config = get_config(['--set-bar'])
> +         self.assertNotIn('FOO', config)
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], True)
> ++        self.assertEqual(config['BAR'], True)
> +
> +         config = get_config(['--set-value=qux'])
> +         self.assertIn('VALUE', config)
> +-        self.assertEquals(config['VALUE'], 'qux')
> ++        self.assertEqual(config['VALUE'], 'qux')
> +
> +         config = get_config(['--set-name=hoge'])
> +         self.assertIn('hoge', config)
> +-        self.assertEquals(config['hoge'], True)
> ++        self.assertEqual(config['hoge'], True)
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {'BAR': False})
> ++        self.assertEqual(config, {'BAR': False})
> +
> +         with self.assertRaises(ConfigureError):
> +             # Both --set-foo and --set-name=FOO are going to try to
> +@@ -454,11 +454,11 @@ class TestConfigure(unittest.TestCase):
> +             set_config('QUX', 'qux', when='--with-qux')
> +         '''):
> +             config = self.get_config()
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': 'foo',
> +             })
> +             config = self.get_config(['--with-qux'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': 'foo',
> +                 'QUX': 'qux',
> +             })
> +@@ -468,27 +468,27 @@ class TestConfigure(unittest.TestCase):
> +             return self.get_config(*args, configure='set_define.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {'DEFINES': {}})
> ++        self.assertEqual(config, {'DEFINES': {}})
> +
> +         config = get_config(['--set-foo'])
> +         self.assertIn('FOO', config['DEFINES'])
> +-        self.assertEquals(config['DEFINES']['FOO'], True)
> ++        self.assertEqual(config['DEFINES']['FOO'], True)
> +
> +         config = get_config(['--set-bar'])
> +         self.assertNotIn('FOO', config['DEFINES'])
> +         self.assertIn('BAR', config['DEFINES'])
> +-        self.assertEquals(config['DEFINES']['BAR'], True)
> ++        self.assertEqual(config['DEFINES']['BAR'], True)
> +
> +         config = get_config(['--set-value=qux'])
> +         self.assertIn('VALUE', config['DEFINES'])
> +-        self.assertEquals(config['DEFINES']['VALUE'], 'qux')
> ++        self.assertEqual(config['DEFINES']['VALUE'], 'qux')
> +
> +         config = get_config(['--set-name=hoge'])
> +         self.assertIn('hoge', config['DEFINES'])
> +-        self.assertEquals(config['DEFINES']['hoge'], True)
> ++        self.assertEqual(config['DEFINES']['hoge'], True)
> +
> +         config = get_config([])
> +-        self.assertEquals(config['DEFINES'], {'BAR': False})
> ++        self.assertEqual(config['DEFINES'], {'BAR': False})
> +
> +         with self.assertRaises(ConfigureError):
> +             # Both --set-foo and --set-name=FOO are going to try to
> +@@ -503,11 +503,11 @@ class TestConfigure(unittest.TestCase):
> +             set_define('QUX', 'qux', when='--with-qux')
> +         '''):
> +             config = self.get_config()
> +-            self.assertEquals(config['DEFINES'], {
> ++            self.assertEqual(config['DEFINES'], {
> +                 'FOO': 'foo',
> +             })
> +             config = self.get_config(['--with-qux'])
> +-            self.assertEquals(config['DEFINES'], {
> ++            self.assertEqual(config['DEFINES'], {
> +                 'FOO': 'foo',
> +                 'QUX': 'qux',
> +             })
> +@@ -518,19 +518,19 @@ class TestConfigure(unittest.TestCase):
> +                 *args, configure='imply_option/simple.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config(['--enable-foo'])
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], PositiveOptionValue())
> ++        self.assertEqual(config['BAR'], PositiveOptionValue())
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             get_config(['--enable-foo', '--disable-bar'])
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "'--enable-bar' implied by '--enable-foo' conflicts with "
> +             "'--disable-bar' from the command-line")
> +@@ -541,31 +541,31 @@ class TestConfigure(unittest.TestCase):
> +                 *args, configure='imply_option/negative.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config(['--enable-foo'])
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], NegativeOptionValue())
> ++        self.assertEqual(config['BAR'], NegativeOptionValue())
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             get_config(['--enable-foo', '--enable-bar'])
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "'--disable-bar' implied by '--enable-foo' conflicts with "
> +             "'--enable-bar' from the command-line")
> +
> +         config = get_config(['--disable-hoge'])
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], NegativeOptionValue())
> ++        self.assertEqual(config['BAR'], NegativeOptionValue())
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             get_config(['--disable-hoge', '--enable-bar'])
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "'--disable-bar' implied by '--disable-hoge' conflicts with "
> +             "'--enable-bar' from the command-line")
> +@@ -576,23 +576,23 @@ class TestConfigure(unittest.TestCase):
> +                 *args, configure='imply_option/values.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config(['--enable-foo=a'])
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], PositiveOptionValue(('a',)))
> ++        self.assertEqual(config['BAR'], PositiveOptionValue(('a',)))
> +
> +         config = get_config(['--enable-foo=a,b'])
> +         self.assertIn('BAR', config)
> +-        self.assertEquals(config['BAR'], PositiveOptionValue(('a','b')))
> ++        self.assertEqual(config['BAR'], PositiveOptionValue(('a','b')))
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             get_config(['--enable-foo=a,b', '--disable-bar'])
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "'--enable-bar=a,b' implied by '--enable-foo' conflicts with "
> +             "'--disable-bar' from the command-line")
> +@@ -603,15 +603,15 @@ class TestConfigure(unittest.TestCase):
> +                 *args, configure='imply_option/infer.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             get_config(['--enable-foo', '--disable-bar'])
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "'--enable-bar' implied by '--enable-foo' conflicts with "
> +             "'--disable-bar' from the command-line")
> +@@ -619,7 +619,7 @@ class TestConfigure(unittest.TestCase):
> +         with self.assertRaises(ConfigureError) as e:
> +             self.get_config([], configure='imply_option/infer_ko.configure')
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             "Cannot infer what implies '--enable-bar'. Please add a `reason` "
> +             "to the `imply_option` call.")
> +@@ -630,25 +630,25 @@ class TestConfigure(unittest.TestCase):
> +                 *args, configure='imply_option/imm.configure')
> +
> +         help, config = get_config(['--help'])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config = get_config([])
> +-        self.assertEquals(config, {})
> ++        self.assertEqual(config, {})
> +
> +         config_path = mozpath.abspath(
> +             mozpath.join(test_data_path, 'imply_option', 'imm.configure'))
> +
> +-        with self.assertRaisesRegexp(InvalidOptionError,
> ++        with self.assertRaisesRegex(InvalidOptionError,
> +             "--enable-foo' implied by 'imply_option at %s:7' conflicts with "
> +             "'--disable-foo' from the command-line" % config_path):
> +             get_config(['--disable-foo'])
> +
> +-        with self.assertRaisesRegexp(InvalidOptionError,
> ++        with self.assertRaisesRegex(InvalidOptionError,
> +             "--enable-bar=foo,bar' implied by 'imply_option at %s:16' conflicts"
> +             " with '--enable-bar=a,b,c' from the command-line" % config_path):
> +             get_config(['--enable-bar=a,b,c'])
> +
> +-        with self.assertRaisesRegexp(InvalidOptionError,
> ++        with self.assertRaisesRegex(InvalidOptionError,
> +             "--enable-baz=BAZ' implied by 'imply_option at %s:25' conflicts"
> +             " with '--enable-baz=QUUX' from the command-line" % config_path):
> +             get_config(['--enable-baz=QUUX'])
> +@@ -660,7 +660,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "`--with-foo`, emitted from `%s` line 2, is unknown."
> +                           % mozpath.join(test_data_path, 'moz.configure'))
> +
> +@@ -675,7 +675,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Unexpected type: 'int'")
> +
> +     def test_imply_option_when(self):
> +@@ -686,12 +686,12 @@ class TestConfigure(unittest.TestCase):
> +             set_config('QUX', depends('--with-qux')(lambda x: x))
> +         '''):
> +             config = self.get_config()
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'QUX': NegativeOptionValue(),
> +             })
> +
> +             config = self.get_config(['--with-foo'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'QUX': PositiveOptionValue(),
> +             })
> +
> +@@ -700,7 +700,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.moz_configure('option("--with-foo", help="foo")'):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `--with-foo` is not handled ; reference it with a @depends'
> +         )
> +@@ -712,7 +712,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `--with-foo` already defined'
> +         )
> +@@ -724,7 +724,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `MOZ_FOO` already defined'
> +         )
> +@@ -736,7 +736,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `MOZ_FOO` already defined'
> +         )
> +@@ -748,7 +748,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `MOZ_FOO` already defined'
> +         )
> +@@ -760,7 +760,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Option `--with-foo` already defined'
> +         )
> +@@ -776,18 +776,18 @@ class TestConfigure(unittest.TestCase):
> +             set_config('QUX', depends('--with-qux', when='--with-foo')(lambda x: x))
> +         '''):
> +             config = self.get_config()
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': NegativeOptionValue(),
> +             })
> +
> +             config = self.get_config(['--with-foo'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': PositiveOptionValue(),
> +                 'QUX': NegativeOptionValue(),
> +             })
> +
> +             config = self.get_config(['--with-foo', '--with-qux'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': PositiveOptionValue(),
> +                 'QUX': PositiveOptionValue(),
> +             })
> +@@ -795,7 +795,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config(['--with-bar'])
> +
> +-            self.assertEquals(
> ++            self.assertEqual(
> +                 e.exception.message,
> +                 '--with-bar is not available in this configuration'
> +             )
> +@@ -803,7 +803,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config(['--with-qux'])
> +
> +-            self.assertEquals(
> ++            self.assertEqual(
> +                 e.exception.message,
> +                 '--with-qux is not available in this configuration'
> +             )
> +@@ -811,18 +811,18 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config(['QUX=1'])
> +
> +-            self.assertEquals(
> ++            self.assertEqual(
> +                 e.exception.message,
> +                 'QUX is not available in this configuration'
> +             )
> +
> +             config = self.get_config(env={'QUX': '1'})
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': NegativeOptionValue(),
> +             })
> +
> +             help, config = self.get_config(['--help'])
> +-            self.assertEquals(help, textwrap.dedent('''\
> ++            self.assertEqual(help, textwrap.dedent('''\
> +                 Usage: configure [options]
> +
> +                 Options: [defaults in brackets after descriptions]
> +@@ -833,7 +833,7 @@ class TestConfigure(unittest.TestCase):
> +             '''))
> +
> +             help, config = self.get_config(['--help', '--with-foo'])
> +-            self.assertEquals(help, textwrap.dedent('''\
> ++            self.assertEqual(help, textwrap.dedent('''\
> +                 Usage: configure [options]
> +
> +                 Options: [defaults in brackets after descriptions]
> +@@ -851,7 +851,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(ConfigureError) as e:
> +                 self.get_config()
> +
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               '@depends function needs the same `when` as '
> +                               'options it depends on')
> +
> +@@ -868,7 +868,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(ConfigureError) as e:
> +                 self.get_config()
> +
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               '@depends function needs the same `when` as '
> +                               'options it depends on')
> +
> +@@ -896,7 +896,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.moz_configure('include("../foo.configure")'):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Cannot include `%s` because it is not in a subdirectory of `%s`'
> +             % (mozpath.normpath(mozpath.join(test_data_path, '..',
> +@@ -911,7 +911,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'Cannot include `%s` because it was included already.'
> +             % mozpath.normpath(mozpath.join(test_data_path,
> +@@ -924,7 +924,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message, "Unexpected type: 'int'")
> ++        self.assertEqual(e.exception.message, "Unexpected type: 'int'")
> +
> +     def test_include_when(self):
> +         with MockedOpen({
> +@@ -967,26 +967,26 @@ class TestConfigure(unittest.TestCase):
> +             '''),
> +         }):
> +             config = self.get_config()
> +-            self.assertEquals(config, {})
> ++            self.assertEqual(config, {})
> +
> +             config = self.get_config(['--with-foo'])
> +-            self.assertEquals(config, {})
> ++            self.assertEqual(config, {})
> +
> +             config = self.get_config(['--with-bar'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'BAR': 'bar',
> +             })
> +
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config(['--with-qux'])
> +
> +-            self.assertEquals(
> ++            self.assertEqual(
> +                 e.exception.message,
> +                 '--with-qux is not available in this configuration'
> +             )
> +
> +             config = self.get_config(['--with-foo', '--with-foo-really'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': 'foo',
> +                 'FOO2': True,
> +             })
> +@@ -998,7 +998,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message, 'Cannot reassign builtins')
> ++        self.assertEqual(e.exception.message, 'Cannot reassign builtins')
> +
> +         with self.assertRaises(KeyError) as e:
> +             with self.moz_configure('''
> +@@ -1006,7 +1006,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           'Cannot assign `foo` because it is neither a '
> +                           '@depends nor a @template')
> +
> +@@ -1019,7 +1019,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "@depends needs at least one argument")
> +
> +         with self.assertRaises(ConfigureError) as e:
> +@@ -1030,7 +1030,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "'--with-foo' is not a known option. Maybe it's "
> +                           "declared too late?")
> +
> +@@ -1042,7 +1042,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Option must not contain an '='")
> +
> +         with self.assertRaises(TypeError) as e:
> +@@ -1053,7 +1053,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Cannot use object of type 'int' as argument "
> +                           "to @depends")
> +
> +@@ -1065,7 +1065,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Cannot decorate generator functions with @depends")
> +
> +         with self.assertRaises(TypeError) as e:
> +@@ -1074,7 +1074,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Unexpected type: 'int'")
> +
> +         with self.assertRaises(ConfigureError) as e:
> +@@ -1088,7 +1088,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The `foo` function may not be called")
> +
> +         with self.assertRaises(TypeError) as e:
> +@@ -1099,7 +1099,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "depends_impl() got an unexpected keyword argument 'foo'")
> +
> +     def test_depends_when(self):
> +@@ -1124,12 +1124,12 @@ class TestConfigure(unittest.TestCase):
> +             set_config('QUX', qux)
> +         '''):
> +             config = self.get_config()
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': 'foo',
> +             })
> +
> +             config = self.get_config(['--with-qux'])
> +-            self.assertEquals(config, {
> ++            self.assertEqual(config, {
> +                 'FOO': 'foo',
> +                 'QUX': 'qux',
> +             })
> +@@ -1144,7 +1144,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           '@imports must appear after @template')
> +
> +         with self.assertRaises(ConfigureError) as e:
> +@@ -1157,7 +1157,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           '@imports must appear after @depends')
> +
> +         for import_ in (
> +@@ -1174,7 +1174,7 @@ class TestConfigure(unittest.TestCase):
> +                 ''' % import_):
> +                     self.get_config()
> +
> +-            self.assertEquals(e.exception.message, "Unexpected type: 'int'")
> ++            self.assertEqual(e.exception.message, "Unexpected type: 'int'")
> +
> +         with self.assertRaises(TypeError) as e:
> +             with self.moz_configure('''
> +@@ -1185,7 +1185,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message, "Unexpected type: 'int'")
> ++        self.assertEqual(e.exception.message, "Unexpected type: 'int'")
> +
> +         with self.assertRaises(ValueError) as e:
> +             with self.moz_configure('''
> +@@ -1195,7 +1195,7 @@ class TestConfigure(unittest.TestCase):
> +             '''):
> +                 self.get_config()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Invalid argument to @imports: 'os*'")
> +
> +     def test_only_when(self):
> +@@ -1250,7 +1250,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config(['--foo'])
> +
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               '--foo is not available in this configuration')
> +
> +         # Cannot depend on an option defined in a only_when block, because we
> +@@ -1261,7 +1261,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(ConfigureError) as e:
> +                 self.get_config()
> +
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               '@depends function needs the same `when` as '
> +                               'options it depends on')
> +
> +@@ -1278,7 +1278,7 @@ class TestConfigure(unittest.TestCase):
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 self.get_config()
> +
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               '--foo is not available in this configuration')
> +
> +         # And similarly doesn't fail when the condition is true.
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_lint.py b/python/mozbuild/mozbuild/test/configure/test_lint.py
> +index 6d8d4c49f..6ad897839 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_lint.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_lint.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> +
> +-from StringIO import StringIO
> ++
> ++from io import StringIO
> + import os
> + import textwrap
> + import unittest
> +@@ -62,7 +62,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "`bar` depends on '--help' and `foo`. "
> +                           "`foo` must depend on '--help'")
> +
> +@@ -85,7 +85,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "`bar` depends on '--help' and `foo`. "
> +                           "`foo` must depend on '--help'")
> +
> +@@ -111,7 +111,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Missing @depends for `foo`: '--help'")
> +
> +         with self.assertRaises(ConfigureError) as e:
> +@@ -130,7 +130,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Missing @depends for `foo`: '--help'")
> +
> +         with self.assertRaises(ConfigureError) as e:
> +@@ -145,7 +145,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Missing @depends for `foo`: '--help'")
> +
> +         # This would have failed with "Missing @depends for `foo`: '--help'"
> +@@ -178,7 +178,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "Missing @depends for `foo`: '--help'")
> +
> +         # There is a default restricted `os` module when there is no explicit
> +@@ -205,7 +205,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "%s:3: The dependency on `--foo` is unused."
> +                           % mozpath.join(test_data_path, 'moz.configure'))
> +
> +@@ -222,7 +222,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "%s:5: The dependency on `bar` is unused."
> +                           % mozpath.join(test_data_path, 'moz.configure'))
> +
> +@@ -236,7 +236,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "%s:2: The dependency on `<lambda>` is unused."
> +                           % mozpath.join(test_data_path, 'moz.configure'))
> +
> +@@ -257,7 +257,7 @@ class TestLint(unittest.TestCase):
> +             '''):
> +                 self.lint_test()
> +
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "%s:9: The dependency on `qux` is unused."
> +                           % mozpath.join(test_data_path, 'moz.configure'))
> +
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_moz_configure.py b/python/mozbuild/mozbuild/test/configure/test_moz_configure.py
> +index b3342e268..7a26e9e09 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_moz_configure.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_moz_configure.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + from mozunit import main
> + from mozpack import path as mozpath
> +@@ -27,10 +27,10 @@ class TestMozConfigure(BaseConfigureTest):
> +             shell = mozpath.abspath('/bin/sh')
> +             return result.replace('CONFIG_SHELL=%s ' % shell, '')
> +
> +-        self.assertEquals('--enable-application=browser',
> ++        self.assertEqual('--enable-application=browser',
> +                           get_value_for(['--enable-application=browser']))
> +
> +-        self.assertEquals('--enable-application=browser '
> ++        self.assertEqual('--enable-application=browser '
> +                           'MOZ_VTUNE=1',
> +                           get_value_for(['--enable-application=browser',
> +                                          'MOZ_VTUNE=1']))
> +@@ -39,25 +39,25 @@ class TestMozConfigure(BaseConfigureTest):
> +             environ={'MOZ_VTUNE': '1'},
> +             mozconfig='ac_add_options --enable-project=js')
> +
> +-        self.assertEquals('--enable-project=js MOZ_VTUNE=1',
> ++        self.assertEqual('--enable-project=js MOZ_VTUNE=1',
> +                           value)
> +
> +         # --disable-js-shell is the default, so it's filtered out.
> +-        self.assertEquals('--enable-application=browser',
> ++        self.assertEqual('--enable-application=browser',
> +                           get_value_for(['--enable-application=browser',
> +                                          '--disable-js-shell']))
> +
> +         # Normally, --without-foo would be filtered out because that's the
> +         # default, but since it is a (fake) old-configure option, it always
> +         # appears.
> +-        self.assertEquals('--enable-application=browser --without-foo',
> ++        self.assertEqual('--enable-application=browser --without-foo',
> +                           get_value_for(['--enable-application=browser',
> +                                          '--without-foo']))
> +-        self.assertEquals('--enable-application=browser --with-foo',
> ++        self.assertEqual('--enable-application=browser --with-foo',
> +                           get_value_for(['--enable-application=browser',
> +                                          '--with-foo']))
> +
> +-        self.assertEquals("--enable-application=browser '--with-foo=foo bar'",
> ++        self.assertEqual("--enable-application=browser '--with-foo=foo bar'",
> +                           get_value_for(['--enable-application=browser',
> +                                          '--with-foo=foo bar']))
> +
> +@@ -69,7 +69,7 @@ class TestMozConfigure(BaseConfigureTest):
> +                 self.version = version
> +
> +             def __call__(self, stdin, args):
> +-                this.assertEquals(args, ('-version',))
> ++                this.assertEqual(args, ('-version',))
> +                 return 0, self.version, ''
> +
> +         def check_nsis_version(version):
> +@@ -84,13 +84,13 @@ class TestMozConfigure(BaseConfigureTest):
> +         with self.assertRaises(SystemExit) as e:
> +             check_nsis_version('v3.0a2')
> +
> +-        self.assertEquals(check_nsis_version('v3.0b1'), '3.0b1')
> +-        self.assertEquals(check_nsis_version('v3.0b2'), '3.0b2')
> +-        self.assertEquals(check_nsis_version('v3.0rc1'), '3.0rc1')
> +-        self.assertEquals(check_nsis_version('v3.0'), '3.0')
> +-        self.assertEquals(check_nsis_version('v3.0-2'), '3.0')
> +-        self.assertEquals(check_nsis_version('v3.0.1'), '3.0')
> +-        self.assertEquals(check_nsis_version('v3.1'), '3.1')
> ++        self.assertEqual(check_nsis_version('v3.0b1'), '3.0b1')
> ++        self.assertEqual(check_nsis_version('v3.0b2'), '3.0b2')
> ++        self.assertEqual(check_nsis_version('v3.0rc1'), '3.0rc1')
> ++        self.assertEqual(check_nsis_version('v3.0'), '3.0')
> ++        self.assertEqual(check_nsis_version('v3.0-2'), '3.0')
> ++        self.assertEqual(check_nsis_version('v3.0.1'), '3.0')
> ++        self.assertEqual(check_nsis_version('v3.1'), '3.1')
> +
> +
> + if __name__ == '__main__':
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_options.py b/python/mozbuild/mozbuild/test/configure/test_options.py
> +index 9defccb2c..330ce3b1f 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_options.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_options.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import unittest
> +
> +@@ -28,139 +28,139 @@ class Option(Option):
> + class TestOption(unittest.TestCase):
> +     def test_option(self):
> +         option = Option('--option')
> +-        self.assertEquals(option.prefix, '')
> +-        self.assertEquals(option.name, 'option')
> +-        self.assertEquals(option.env, None)
> ++        self.assertEqual(option.prefix, '')
> ++        self.assertEqual(option.name, 'option')
> ++        self.assertEqual(option.env, None)
> +         self.assertFalse(option.default)
> +
> +         option = Option('--enable-option')
> +-        self.assertEquals(option.prefix, 'enable')
> +-        self.assertEquals(option.name, 'option')
> +-        self.assertEquals(option.env, None)
> ++        self.assertEqual(option.prefix, 'enable')
> ++        self.assertEqual(option.name, 'option')
> ++        self.assertEqual(option.env, None)
> +         self.assertFalse(option.default)
> +
> +         option = Option('--disable-option')
> +-        self.assertEquals(option.prefix, 'disable')
> +-        self.assertEquals(option.name, 'option')
> +-        self.assertEquals(option.env, None)
> ++        self.assertEqual(option.prefix, 'disable')
> ++        self.assertEqual(option.name, 'option')
> ++        self.assertEqual(option.env, None)
> +         self.assertTrue(option.default)
> +
> +         option = Option('--with-option')
> +-        self.assertEquals(option.prefix, 'with')
> +-        self.assertEquals(option.name, 'option')
> +-        self.assertEquals(option.env, None)
> ++        self.assertEqual(option.prefix, 'with')
> ++        self.assertEqual(option.name, 'option')
> ++        self.assertEqual(option.env, None)
> +         self.assertFalse(option.default)
> +
> +         option = Option('--without-option')
> +-        self.assertEquals(option.prefix, 'without')
> +-        self.assertEquals(option.name, 'option')
> +-        self.assertEquals(option.env, None)
> ++        self.assertEqual(option.prefix, 'without')
> ++        self.assertEqual(option.name, 'option')
> ++        self.assertEqual(option.env, None)
> +         self.assertTrue(option.default)
> +
> +         option = Option('--without-option-foo', env='MOZ_OPTION')
> +-        self.assertEquals(option.env, 'MOZ_OPTION')
> ++        self.assertEqual(option.env, 'MOZ_OPTION')
> +
> +         option = Option(env='MOZ_OPTION')
> +-        self.assertEquals(option.prefix, '')
> +-        self.assertEquals(option.name, None)
> +-        self.assertEquals(option.env, 'MOZ_OPTION')
> ++        self.assertEqual(option.prefix, '')
> ++        self.assertEqual(option.name, None)
> ++        self.assertEqual(option.env, 'MOZ_OPTION')
> +         self.assertFalse(option.default)
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=0, default=('a',))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=1, default=())
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'default must be a bool, a string or a tuple of strings')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=1, default=True)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=1, default=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=2, default=())
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'default must be a bool, a string or a tuple of strings')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=2, default=True)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=2, default=('a',))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs='?', default=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs='+', default=())
> +-        self.assertEquals(
> ++        self.assertEqual(
> +             e.exception.message,
> +             'default must be a bool, a string or a tuple of strings')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs='+', default=True)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         # --disable options with a nargs value that requires at least one
> +         # argument need to be given a default.
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--disable-option', nargs=1)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--disable-option', nargs='+')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +         # Test nargs inference from default value
> +         option = Option('--with-foo', default=True)
> +-        self.assertEquals(option.nargs, 0)
> ++        self.assertEqual(option.nargs, 0)
> +
> +         option = Option('--with-foo', default=False)
> +-        self.assertEquals(option.nargs, 0)
> ++        self.assertEqual(option.nargs, 0)
> +
> +         option = Option('--with-foo', default='a')
> +-        self.assertEquals(option.nargs, '?')
> ++        self.assertEqual(option.nargs, '?')
> +
> +         option = Option('--with-foo', default=('a',))
> +-        self.assertEquals(option.nargs, '?')
> ++        self.assertEqual(option.nargs, '?')
> +
> +         option = Option('--with-foo', default=('a', 'b'))
> +-        self.assertEquals(option.nargs, '*')
> ++        self.assertEqual(option.nargs, '*')
> +
> +         option = Option(env='FOO', default=True)
> +-        self.assertEquals(option.nargs, 0)
> ++        self.assertEqual(option.nargs, 0)
> +
> +         option = Option(env='FOO', default=False)
> +-        self.assertEquals(option.nargs, 0)
> ++        self.assertEqual(option.nargs, 0)
> +
> +         option = Option(env='FOO', default='a')
> +-        self.assertEquals(option.nargs, '?')
> ++        self.assertEqual(option.nargs, '?')
> +
> +         option = Option(env='FOO', default=('a',))
> +-        self.assertEquals(option.nargs, '?')
> ++        self.assertEqual(option.nargs, '?')
> +
> +         option = Option(env='FOO', default=('a', 'b'))
> +-        self.assertEquals(option.nargs, '*')
> ++        self.assertEqual(option.nargs, '*')
> +
> +     def test_option_option(self):
> +         for option in (
> +@@ -170,70 +170,70 @@ class TestOption(unittest.TestCase):
> +             '--with-option',
> +             '--without-option',
> +         ):
> +-            self.assertEquals(Option(option).option, option)
> +-            self.assertEquals(Option(option, env='FOO').option, option)
> ++            self.assertEqual(Option(option).option, option)
> ++            self.assertEqual(Option(option, env='FOO').option, option)
> +
> +             opt = Option(option, default=False)
> +-            self.assertEquals(opt.option,
> ++            self.assertEqual(opt.option,
> +                               option.replace('-disable-', '-enable-')
> +                                     .replace('-without-', '-with-'))
> +
> +             opt = Option(option, default=True)
> +-            self.assertEquals(opt.option,
> ++            self.assertEqual(opt.option,
> +                               option.replace('-enable-', '-disable-')
> +                                     .replace('-with-', '-without-'))
> +
> +-        self.assertEquals(Option(env='FOO').option, 'FOO')
> ++        self.assertEqual(Option(env='FOO').option, 'FOO')
> +
> +     def test_option_choices(self):
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=3, choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           'Not enough `choices` for `nargs`')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--without-option', nargs=1, choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           'A `default` must be given along with `choices`')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--without-option', nargs='+', choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           'A `default` must be given along with `choices`')
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--without-option', default='c', choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The `default` value must be one of 'a', 'b'")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--without-option', default=('a', 'c',), choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The `default` value must be one of 'a', 'b'")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--without-option', default=('c',), choices=('a', 'b'))
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The `default` value must be one of 'a', 'b'")
> +
> +         option = Option('--with-option', nargs='+', choices=('a', 'b'))
> +         with self.assertRaises(InvalidOptionError) as e:
> +             option.get_value('--with-option=c')
> +-        self.assertEquals(e.exception.message, "'c' is not one of 'a', 'b'")
> ++        self.assertEqual(e.exception.message, "'c' is not one of 'a', 'b'")
> +
> +         value = option.get_value('--with-option=b,a')
> +         self.assertTrue(value)
> +-        self.assertEquals(PositiveOptionValue(('b', 'a')), value)
> ++        self.assertEqual(PositiveOptionValue(('b', 'a')), value)
> +
> +         option = Option('--without-option', nargs='*', default='a',
> +                         choices=('a', 'b'))
> +         with self.assertRaises(InvalidOptionError) as e:
> +             option.get_value('--with-option=c')
> +-        self.assertEquals(e.exception.message, "'c' is not one of 'a', 'b'")
> ++        self.assertEqual(e.exception.message, "'c' is not one of 'a', 'b'")
> +
> +         value = option.get_value('--with-option=b,a')
> +         self.assertTrue(value)
> +-        self.assertEquals(PositiveOptionValue(('b', 'a')), value)
> ++        self.assertEqual(PositiveOptionValue(('b', 'a')), value)
> +
> +         # Test nargs inference from choices
> +         option = Option('--with-option', choices=('a', 'b'))
> +@@ -244,37 +244,37 @@ class TestOption(unittest.TestCase):
> +                         choices=('a', 'b', 'c', 'd'))
> +
> +         value = option.get_value('--with-option=+d')
> +-        self.assertEquals(PositiveOptionValue(('b', 'c', 'd')), value)
> ++        self.assertEqual(PositiveOptionValue(('b', 'c', 'd')), value)
> +
> +         value = option.get_value('--with-option=-b')
> +-        self.assertEquals(PositiveOptionValue(('c',)), value)
> ++        self.assertEqual(PositiveOptionValue(('c',)), value)
> +
> +         value = option.get_value('--with-option=-b,+d')
> +-        self.assertEquals(PositiveOptionValue(('c','d')), value)
> ++        self.assertEqual(PositiveOptionValue(('c','d')), value)
> +
> +         # Adding something that is in the default is fine
> +         value = option.get_value('--with-option=+b')
> +-        self.assertEquals(PositiveOptionValue(('b', 'c')), value)
> ++        self.assertEqual(PositiveOptionValue(('b', 'c')), value)
> +
> +         # Removing something that is not in the default is fine, as long as it
> +         # is one of the choices
> +         value = option.get_value('--with-option=-a')
> +-        self.assertEquals(PositiveOptionValue(('b', 'c')), value)
> ++        self.assertEqual(PositiveOptionValue(('b', 'c')), value)
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             option.get_value('--with-option=-e')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "'e' is not one of 'a', 'b', 'c', 'd'")
> +
> +         # Other "not a choice" errors.
> +         with self.assertRaises(InvalidOptionError) as e:
> +             option.get_value('--with-option=+e')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "'e' is not one of 'a', 'b', 'c', 'd'")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             option.get_value('--with-option=e')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "'e' is not one of 'a', 'b', 'c', 'd'")
> +
> +     def test_option_value_compare(self):
> +@@ -294,7 +294,7 @@ class TestOption(unittest.TestCase):
> +
> +         # For usability reasons, we raise TypeError when attempting to compare
> +         # against a non-tuple.
> +-        with self.assertRaisesRegexp(TypeError, 'cannot compare a'):
> ++        with self.assertRaisesRegex(TypeError, 'cannot compare a'):
> +             val == 'foo'
> +
> +         # But we allow empty option values to compare otherwise we can't
> +@@ -313,36 +313,36 @@ class TestOption(unittest.TestCase):
> +
> +     def test_option_value_format(self):
> +         val = PositiveOptionValue()
> +-        self.assertEquals('--with-value', val.format('--with-value'))
> +-        self.assertEquals('--with-value', val.format('--without-value'))
> +-        self.assertEquals('--enable-value', val.format('--enable-value'))
> +-        self.assertEquals('--enable-value', val.format('--disable-value'))
> +-        self.assertEquals('--value', val.format('--value'))
> +-        self.assertEquals('VALUE=1', val.format('VALUE'))
> ++        self.assertEqual('--with-value', val.format('--with-value'))
> ++        self.assertEqual('--with-value', val.format('--without-value'))
> ++        self.assertEqual('--enable-value', val.format('--enable-value'))
> ++        self.assertEqual('--enable-value', val.format('--disable-value'))
> ++        self.assertEqual('--value', val.format('--value'))
> ++        self.assertEqual('VALUE=1', val.format('VALUE'))
> +
> +         val = PositiveOptionValue(('a',))
> +-        self.assertEquals('--with-value=a', val.format('--with-value'))
> +-        self.assertEquals('--with-value=a', val.format('--without-value'))
> +-        self.assertEquals('--enable-value=a', val.format('--enable-value'))
> +-        self.assertEquals('--enable-value=a', val.format('--disable-value'))
> +-        self.assertEquals('--value=a', val.format('--value'))
> +-        self.assertEquals('VALUE=a', val.format('VALUE'))
> ++        self.assertEqual('--with-value=a', val.format('--with-value'))
> ++        self.assertEqual('--with-value=a', val.format('--without-value'))
> ++        self.assertEqual('--enable-value=a', val.format('--enable-value'))
> ++        self.assertEqual('--enable-value=a', val.format('--disable-value'))
> ++        self.assertEqual('--value=a', val.format('--value'))
> ++        self.assertEqual('VALUE=a', val.format('VALUE'))
> +
> +         val = PositiveOptionValue(('a', 'b'))
> +-        self.assertEquals('--with-value=a,b', val.format('--with-value'))
> +-        self.assertEquals('--with-value=a,b', val.format('--without-value'))
> +-        self.assertEquals('--enable-value=a,b', val.format('--enable-value'))
> +-        self.assertEquals('--enable-value=a,b', val.format('--disable-value'))
> +-        self.assertEquals('--value=a,b', val.format('--value'))
> +-        self.assertEquals('VALUE=a,b', val.format('VALUE'))
> ++        self.assertEqual('--with-value=a,b', val.format('--with-value'))
> ++        self.assertEqual('--with-value=a,b', val.format('--without-value'))
> ++        self.assertEqual('--enable-value=a,b', val.format('--enable-value'))
> ++        self.assertEqual('--enable-value=a,b', val.format('--disable-value'))
> ++        self.assertEqual('--value=a,b', val.format('--value'))
> ++        self.assertEqual('VALUE=a,b', val.format('VALUE'))
> +
> +         val = NegativeOptionValue()
> +-        self.assertEquals('--without-value', val.format('--with-value'))
> +-        self.assertEquals('--without-value', val.format('--without-value'))
> +-        self.assertEquals('--disable-value', val.format('--enable-value'))
> +-        self.assertEquals('--disable-value', val.format('--disable-value'))
> +-        self.assertEquals('', val.format('--value'))
> +-        self.assertEquals('VALUE=', val.format('VALUE'))
> ++        self.assertEqual('--without-value', val.format('--with-value'))
> ++        self.assertEqual('--without-value', val.format('--without-value'))
> ++        self.assertEqual('--disable-value', val.format('--enable-value'))
> ++        self.assertEqual('--disable-value', val.format('--disable-value'))
> ++        self.assertEqual('', val.format('--value'))
> ++        self.assertEqual('VALUE=', val.format('VALUE'))
> +
> +     def test_option_value(self, name='option', nargs=0, default=None):
> +         disabled = name.startswith(('disable-', 'without-'))
> +@@ -359,28 +359,28 @@ class TestOption(unittest.TestCase):
> +
> +         if nargs in (0, '?', '*') or disabled:
> +             value = option.get_value('--%s' % name, 'option')
> +-            self.assertEquals(value, posOptionValue())
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, posOptionValue())
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s' % name)
> +             if nargs == 1:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes 1 value' % name)
> +             elif nargs == '+':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes 1 or more values' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes 2 values' % name)
> +
> +         value = option.get_value('')
> +-        self.assertEquals(value, defaultValue)
> +-        self.assertEquals(value.origin, 'default')
> ++        self.assertEqual(value, defaultValue)
> ++        self.assertEqual(value.origin, 'default')
> +
> +         value = option.get_value(None)
> +-        self.assertEquals(value, defaultValue)
> +-        self.assertEquals(value.origin, 'default')
> ++        self.assertEqual(value, defaultValue)
> ++        self.assertEqual(value.origin, 'default')
> +
> +         with self.assertRaises(AssertionError):
> +             value = option.get_value('MOZ_OPTION=', 'environment')
> +@@ -393,47 +393,47 @@ class TestOption(unittest.TestCase):
> +
> +         if nargs in (1, '?', '*', '+') and not disabled:
> +             value = option.get_value('--%s=' % name, 'option')
> +-            self.assertEquals(value, PositiveOptionValue(('',)))
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, PositiveOptionValue(('',)))
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s=' % name)
> +             if disabled:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'Cannot pass a value to --%s' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes %d values' % (name, nargs))
> +
> +         if nargs in (1, '?', '*', '+') and not disabled:
> +             value = option.get_value('--%s=foo' % name, 'option')
> +-            self.assertEquals(value, PositiveOptionValue(('foo',)))
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, PositiveOptionValue(('foo',)))
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s=foo' % name)
> +             if disabled:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'Cannot pass a value to --%s' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes %d values' % (name, nargs))
> +
> +         if nargs in (2, '*', '+') and not disabled:
> +             value = option.get_value('--%s=foo,bar' % name, 'option')
> +-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s=foo,bar' % name, 'option')
> +             if disabled:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'Cannot pass a value to --%s' % name)
> +             elif nargs == '?':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes 0 or 1 values' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes %d value%s'
> +                                   % (name, nargs, 's' if nargs != 1 else ''))
> +
> +@@ -441,59 +441,59 @@ class TestOption(unittest.TestCase):
> +                         default=default)
> +         if nargs in (0, '?', '*') or disabled:
> +             value = option.get_value('--%s' % name, 'option')
> +-            self.assertEquals(value, posOptionValue())
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, posOptionValue())
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s' % name)
> +             if disabled:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'Cannot pass a value to --%s' % name)
> +             elif nargs == '+':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes 1 or more values' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes %d value%s'
> +                                   % (name, nargs, 's' if nargs != 1 else ''))
> +
> +         value = option.get_value('')
> +-        self.assertEquals(value, defaultValue)
> +-        self.assertEquals(value.origin, 'default')
> ++        self.assertEqual(value, defaultValue)
> ++        self.assertEqual(value.origin, 'default')
> +
> +         value = option.get_value(None)
> +-        self.assertEquals(value, defaultValue)
> +-        self.assertEquals(value.origin, 'default')
> ++        self.assertEqual(value, defaultValue)
> ++        self.assertEqual(value.origin, 'default')
> +
> +         value = option.get_value('MOZ_OPTION=', 'environment')
> +-        self.assertEquals(value, NegativeOptionValue())
> +-        self.assertEquals(value.origin, 'environment')
> ++        self.assertEqual(value, NegativeOptionValue())
> ++        self.assertEqual(value.origin, 'environment')
> +
> +         if nargs in (0, '?', '*'):
> +             value = option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue())
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue())
> ++            self.assertEqual(value.origin, 'environment')
> +         elif nargs in (1, '+'):
> +             value = option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('1',)))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('1',)))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(e.exception.message, 'MOZ_OPTION takes 2 values')
> ++            self.assertEqual(e.exception.message, 'MOZ_OPTION takes 2 values')
> +
> +         if nargs in (1, '?', '*', '+') and not disabled:
> +             value = option.get_value('--%s=' % name, 'option')
> +-            self.assertEquals(value, PositiveOptionValue(('',)))
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, PositiveOptionValue(('',)))
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s=' % name, 'option')
> +             if disabled:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'Cannot pass a value to --%s' % name)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s takes %d values' % (name, nargs))
> +
> +         with self.assertRaises(AssertionError):
> +@@ -501,26 +501,26 @@ class TestOption(unittest.TestCase):
> +
> +         if nargs in (1, '?', '*', '+'):
> +             value = option.get_value('MOZ_OPTION=foo', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('foo',)))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('foo',)))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('MOZ_OPTION=foo', 'environment')
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               'MOZ_OPTION takes %d values' % nargs)
> +
> +         if nargs in (2, '*', '+'):
> +             value = option.get_value('MOZ_OPTION=foo,bar', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('MOZ_OPTION=foo,bar', 'environment')
> +             if nargs == '?':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'MOZ_OPTION takes 0 or 1 values')
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'MOZ_OPTION takes %d value%s'
> +                                   % (nargs, 's' if nargs != 1 else ''))
> +
> +@@ -532,26 +532,26 @@ class TestOption(unittest.TestCase):
> +             env_option.get_value('--%s' % name)
> +
> +         value = env_option.get_value('')
> +-        self.assertEquals(value, defaultValue)
> +-        self.assertEquals(value.origin, 'default')
> ++        self.assertEqual(value, defaultValue)
> ++        self.assertEqual(value.origin, 'default')
> +
> +         value = env_option.get_value('MOZ_OPTION=', 'environment')
> +-        self.assertEquals(value, negOptionValue())
> +-        self.assertEquals(value.origin, 'environment')
> ++        self.assertEqual(value, negOptionValue())
> ++        self.assertEqual(value.origin, 'environment')
> +
> +         if nargs in (0, '?', '*'):
> +             value = env_option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(value, posOptionValue())
> ++            self.assertEqual(value, posOptionValue())
> +             self.assertTrue(value)
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value.origin, 'environment')
> +         elif nargs in (1, '+'):
> +             value = env_option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('1',)))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('1',)))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 env_option.get_value('MOZ_OPTION=1', 'environment')
> +-            self.assertEquals(e.exception.message, 'MOZ_OPTION takes 2 values')
> ++            self.assertEqual(e.exception.message, 'MOZ_OPTION takes 2 values')
> +
> +         with self.assertRaises(AssertionError) as e:
> +             env_option.get_value('--%s' % name)
> +@@ -561,26 +561,26 @@ class TestOption(unittest.TestCase):
> +
> +         if nargs in (1, '?', '*', '+'):
> +             value = env_option.get_value('MOZ_OPTION=foo', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('foo',)))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('foo',)))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 env_option.get_value('MOZ_OPTION=foo', 'environment')
> +-            self.assertEquals(e.exception.message,
> ++            self.assertEqual(e.exception.message,
> +                               'MOZ_OPTION takes %d values' % nargs)
> +
> +         if nargs in (2, '*', '+'):
> +             value = env_option.get_value('MOZ_OPTION=foo,bar', 'environment')
> +-            self.assertEquals(value, PositiveOptionValue(('foo', 'bar')))
> +-            self.assertEquals(value.origin, 'environment')
> ++            self.assertEqual(value, PositiveOptionValue(('foo', 'bar')))
> ++            self.assertEqual(value.origin, 'environment')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 env_option.get_value('MOZ_OPTION=foo,bar', 'environment')
> +             if nargs == '?':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'MOZ_OPTION takes 0 or 1 values')
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   'MOZ_OPTION takes %d value%s'
> +                                   % (nargs, 's' if nargs != 1 else ''))
> +
> +@@ -592,28 +592,28 @@ class TestOption(unittest.TestCase):
> +                                         default=default)
> +
> +         value = option.get_value('--%s-option' % disable, 'option')
> +-        self.assertEquals(value, NegativeOptionValue())
> +-        self.assertEquals(value.origin, 'option')
> ++        self.assertEqual(value, NegativeOptionValue())
> ++        self.assertEqual(value.origin, 'option')
> +
> +         option = self.test_option_value('%s-option' % disable, nargs=nargs,
> +                                         default=default)
> +
> +         if nargs in (0, '?', '*'):
> +             value = option.get_value('--%s-option' % enable, 'option')
> +-            self.assertEquals(value, PositiveOptionValue())
> +-            self.assertEquals(value.origin, 'option')
> ++            self.assertEqual(value, PositiveOptionValue())
> ++            self.assertEqual(value.origin, 'option')
> +         else:
> +             with self.assertRaises(InvalidOptionError) as e:
> +                 option.get_value('--%s-option' % enable, 'option')
> +             if nargs == 1:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s-option takes 1 value' % enable)
> +             elif nargs == '+':
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s-option takes 1 or more values'
> +                                   % enable)
> +             else:
> +-                self.assertEquals(e.exception.message,
> ++                self.assertEqual(e.exception.message,
> +                                   '--%s-option takes 2 values' % enable)
> +
> +     def test_option_value_with(self):
> +@@ -622,12 +622,12 @@ class TestOption(unittest.TestCase):
> +     def test_option_value_invalid_nargs(self):
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs='foo')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "nargs must be a positive integer, '?', '*' or '+'")
> +
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--option', nargs=-2)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "nargs must be a positive integer, '?', '*' or '+'")
> +
> +     def test_option_value_nargs_1(self):
> +@@ -638,7 +638,7 @@ class TestOption(unittest.TestCase):
> +         # A default is required
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--disable-option', nargs=1)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +     def test_option_value_nargs_2(self):
> +@@ -649,7 +649,7 @@ class TestOption(unittest.TestCase):
> +         # A default is required
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--disable-option', nargs=2)
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +     def test_option_value_nargs_0_or_1(self):
> +@@ -676,7 +676,7 @@ class TestOption(unittest.TestCase):
> +         # A default is required
> +         with self.assertRaises(InvalidOptionError) as e:
> +             Option('--disable-option', nargs='+')
> +-        self.assertEquals(e.exception.message,
> ++        self.assertEqual(e.exception.message,
> +                           "The given `default` doesn't satisfy `nargs`")
> +
> +
> +@@ -684,21 +684,21 @@ class TestCommandLineHelper(unittest.TestCase):
> +     def test_basic(self):
> +         helper = CommandLineHelper({}, ['cmd', '--foo', '--bar'])
> +
> +-        self.assertEquals(['--foo', '--bar'], list(helper))
> ++        self.assertEqual(['--foo', '--bar'], list(helper))
> +
> +         helper.add('--enable-qux')
> +
> +-        self.assertEquals(['--foo', '--bar', '--enable-qux'], list(helper))
> ++        self.assertEqual(['--foo', '--bar', '--enable-qux'], list(helper))
> +
> +         value, option = helper.handle(Option('--bar'))
> +-        self.assertEquals(['--foo', '--enable-qux'], list(helper))
> +-        self.assertEquals(PositiveOptionValue(), value)
> +-        self.assertEquals('--bar', option)
> ++        self.assertEqual(['--foo', '--enable-qux'], list(helper))
> ++        self.assertEqual(PositiveOptionValue(), value)
> ++        self.assertEqual('--bar', option)
> +
> +         value, option = helper.handle(Option('--baz'))
> +-        self.assertEquals(['--foo', '--enable-qux'], list(helper))
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals(None, option)
> ++        self.assertEqual(['--foo', '--enable-qux'], list(helper))
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual(None, option)
> +
> +         with self.assertRaises(AssertionError):
> +             CommandLineHelper({}, ['--foo', '--bar'])
> +@@ -707,89 +707,89 @@ class TestCommandLineHelper(unittest.TestCase):
> +         foo = Option('--with-foo', nargs='*')
> +         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--with-foo=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--with-foo=a,b', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b',
> +                                         '--without-foo'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--without-foo', option)
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--without-foo', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', '--without-foo',
> +                                         '--with-foo=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--with-foo=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--with-foo=a,b', option)
> +
> +         foo = Option('--with-foo', env='FOO', nargs='*')
> +         helper = CommandLineHelper({'FOO': ''}, ['cmd', '--with-foo=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--with-foo=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--with-foo=a,b', option)
> +
> +         helper = CommandLineHelper({'FOO': 'a,b'}, ['cmd', '--without-foo'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--without-foo', option)
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--without-foo', option)
> +
> +         helper = CommandLineHelper({'FOO': ''}, ['cmd', '--with-bar=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals('environment', value.origin)
> +-        self.assertEquals('FOO=', option)
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual('environment', value.origin)
> ++        self.assertEqual('FOO=', option)
> +
> +         helper = CommandLineHelper({'FOO': 'a,b'}, ['cmd', '--without-bar'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('environment', value.origin)
> +-        self.assertEquals('FOO=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('environment', value.origin)
> ++        self.assertEqual('FOO=a,b', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', '--with-foo=a,b', 'FOO='])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('FOO=', option)
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('FOO=', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', '--without-foo', 'FOO=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('FOO=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('FOO=a,b', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', 'FOO=', '--with-foo=a,b'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b')), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--with-foo=a,b', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b')), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--with-foo=a,b', option)
> +
> +         helper = CommandLineHelper({}, ['cmd', 'FOO=a,b', '--without-foo'])
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(NegativeOptionValue(), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--without-foo', option)
> ++        self.assertEqual(NegativeOptionValue(), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--without-foo', option)
> +
> +     def test_extra_args(self):
> +         foo = Option('--with-foo', env='FOO', nargs='*')
> +         helper = CommandLineHelper({}, ['cmd'])
> +         helper.add('FOO=a,b,c', 'other-origin')
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
> +-        self.assertEquals('other-origin', value.origin)
> +-        self.assertEquals('FOO=a,b,c', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
> ++        self.assertEqual('other-origin', value.origin)
> ++        self.assertEqual('FOO=a,b,c', option)
> +
> +         helper = CommandLineHelper({}, ['cmd'])
> +         helper.add('FOO=a,b,c', 'other-origin')
> +         helper.add('--with-foo=a,b,c', 'other-origin')
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
> +-        self.assertEquals('other-origin', value.origin)
> +-        self.assertEquals('--with-foo=a,b,c', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
> ++        self.assertEqual('other-origin', value.origin)
> ++        self.assertEqual('--with-foo=a,b,c', option)
> +
> +         # Adding conflicting options is not allowed.
> +         helper = CommandLineHelper({}, ['cmd'])
> +@@ -809,9 +809,9 @@ class TestCommandLineHelper(unittest.TestCase):
> +         # But adding the same is allowed.
> +         helper.add('FOO=a,b,c', 'other-origin')
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
> +-        self.assertEquals('other-origin', value.origin)
> +-        self.assertEquals('FOO=a,b,c', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
> ++        self.assertEqual('other-origin', value.origin)
> ++        self.assertEqual('FOO=a,b,c', option)
> +
> +         # The same rule as above applies when using the option form vs. the
> +         # variable form. But we can't detect it when .add is called.
> +@@ -837,9 +837,9 @@ class TestCommandLineHelper(unittest.TestCase):
> +         helper.add('FOO=a,b,c', 'other-origin')
> +         helper.add('--with-foo=a,b,c', 'other-origin')
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(('a', 'b', 'c')), value)
> +-        self.assertEquals('other-origin', value.origin)
> +-        self.assertEquals('--with-foo=a,b,c', option)
> ++        self.assertEqual(PositiveOptionValue(('a', 'b', 'c')), value)
> ++        self.assertEqual('other-origin', value.origin)
> ++        self.assertEqual('--with-foo=a,b,c', option)
> +
> +         # Conflicts are also not allowed against what is in the
> +         # environment/on the command line.
> +@@ -869,19 +869,19 @@ class TestCommandLineHelper(unittest.TestCase):
> +         foo = Option('--foo',
> +                      possible_origins=('command-line',))
> +         value, option = helper.handle(foo)
> +-        self.assertEquals(PositiveOptionValue(), value)
> +-        self.assertEquals('command-line', value.origin)
> +-        self.assertEquals('--foo', option)
> ++        self.assertEqual(PositiveOptionValue(), value)
> ++        self.assertEqual('command-line', value.origin)
> ++        self.assertEqual('--foo', option)
> +
> +         bar = Option('--bar',
> +                      possible_origins=('mozconfig',))
> +-        with self.assertRaisesRegexp(InvalidOptionError,
> ++        with self.assertRaisesRegex(InvalidOptionError,
> +             "--bar can not be set by command-line. Values are accepted from: mozconfig"):
> +             helper.handle(bar)
> +
> +         baz = Option(env='BAZ',
> +                      possible_origins=('implied',))
> +-        with self.assertRaisesRegexp(InvalidOptionError,
> ++        with self.assertRaisesRegex(InvalidOptionError,
> +             "BAZ=1 can not be set by environment. Values are accepted from: implied"):
> +             helper.handle(baz)
> +
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py b/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
> +index cb7ff709e..c339a32bf 100755
> +--- a/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_toolchain_configure.py
> +@@ -2,12 +2,12 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import logging
> + import os
> +
> +-from StringIO import StringIO
> ++from io import StringIO
> +
> + from mozunit import main
> +
> +@@ -366,9 +366,9 @@ class BaseToolchainTest(BaseConfigureTest):
> +                 compiler = sandbox._value_for(sandbox[var])
> +                 # Add var on both ends to make it clear which of the
> +                 # variables is failing the test when that happens.
> +-                self.assertEquals((var, compiler), (var, result))
> ++                self.assertEqual((var, compiler), (var, result))
> +             except SystemExit:
> +-                self.assertEquals((var, result),
> ++                self.assertEqual((var, result),
> +                                   (var, self.out.getvalue().strip()))
> +                 return
> +
> +@@ -407,7 +407,7 @@ class BaseToolchainTest(BaseConfigureTest):
> +             'RUST_LIB_SUFFIX',
> +             'OBJ_SUFFIX',
> +         ):
> +-            self.assertEquals('%s=%s' % (k, sandbox.get_config(k)),
> ++            self.assertEqual('%s=%s' % (k, sandbox.get_config(k)),
> +                               '%s=%s' % (k, library_name_info[k]))
> +
> +
> +@@ -584,7 +584,7 @@ class LinuxToolchainTest(BaseToolchainTest):
> +         # We'll try gcc and clang, but since there is no gcc (gcc-x.y doesn't
> +         # count), find clang.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) not in ('gcc', 'g++')
> +         }
> +         self.do_toolchain_test(paths, {
> +@@ -619,7 +619,7 @@ class LinuxToolchainTest(BaseToolchainTest):
> +         # Even if there are gcc-x.y or clang-x.y compilers available, we
> +         # don't try them. This could be considered something to improve.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) not in ('gcc', 'g++', 'clang', 'clang++')
> +         }
> +         self.do_toolchain_test(paths, {
> +@@ -800,7 +800,7 @@ class OSXToolchainTest(BaseToolchainTest):
> +     def test_not_gcc(self):
> +         # We won't pick GCC if it's the only thing available.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) not in ('clang', 'clang++')
> +         }
> +         self.do_toolchain_test(paths, {
> +@@ -976,7 +976,7 @@ class WindowsToolchainTest(BaseToolchainTest):
> +     def test_clang_cl(self):
> +         # We'll pick clang-cl if msvc can't be found.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) != 'cl'
> +         }
> +         self.do_toolchain_test(paths, {
> +@@ -987,7 +987,7 @@ class WindowsToolchainTest(BaseToolchainTest):
> +     def test_gcc(self):
> +         # We'll pick GCC if msvc and clang-cl can't be found.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) not in ('cl', 'clang-cl')
> +         }
> +         self.do_toolchain_test(paths, {
> +@@ -1006,7 +1006,7 @@ class WindowsToolchainTest(BaseToolchainTest):
> +     def test_clang(self):
> +         # We'll pick clang if nothing else is found.
> +         paths = {
> +-            k: v for k, v in self.PATHS.iteritems()
> ++            k: v for k, v in self.PATHS.items()
> +             if os.path.basename(k) not in ('cl', 'clang-cl', 'gcc')
> +         }
> +         self.do_toolchain_test(paths, {
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py b/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py
> +index 8ec33a8b7..ba046ed12 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import copy
> + import re
> +@@ -10,7 +10,7 @@ import types
> + import unittest
> +
> + from fnmatch import fnmatch
> +-from StringIO import StringIO
> ++from io import StringIO
> + from textwrap import dedent
> +
> + from mozunit import (
> +@@ -43,7 +43,7 @@ class CompilerPreprocessor(Preprocessor):
> +         # Hack around it enough that the configure tests work properly.
> +         context = self.context
> +         def normalize_numbers(value):
> +-            if isinstance(value, types.StringTypes):
> ++            if isinstance(value, (str,)):
> +                 if value[-1:] == 'L' and value[:-1].isdigit():
> +                     value = int(value[:-1])
> +             return value
> +@@ -53,7 +53,7 @@ class CompilerPreprocessor(Preprocessor):
> +             return self.HAS_FEATURE.sub(r'\1\2', expr)
> +         self.context = self.Context(
> +             (normalize_has_feature(k), normalize_numbers(v))
> +-            for k, v in context.iteritems()
> ++            for k, v in context.items()
> +         )
> +         try:
> +             return Preprocessor.do_if(self, normalize_has_feature(expression),
> +@@ -95,7 +95,7 @@ class TestCompilerPreprocessor(unittest.TestCase):
> +         input.name = 'foo'
> +         pp.do_include(input)
> +
> +-        self.assertEquals(pp.out.getvalue(), '1 . 2 . c "D"')
> ++        self.assertEqual(pp.out.getvalue(), '1 . 2 . c "D"')
> +
> +     def test_condition(self):
> +         pp = CompilerPreprocessor({
> +@@ -125,7 +125,7 @@ class TestCompilerPreprocessor(unittest.TestCase):
> +         input.name = 'foo'
> +         pp.do_include(input)
> +
> +-        self.assertEquals('IFDEF_A\nIF_A\nIF_B\nIF_NOT_C\n', pp.out.getvalue())
> ++        self.assertEqual('IFDEF_A\nIF_A\nIF_B\nIF_NOT_C\n', pp.out.getvalue())
> +
> +
> + class FakeCompiler(dict):
> +@@ -164,9 +164,9 @@ class FakeCompiler(dict):
> +     '''
> +     def __init__(self, *definitions):
> +         for definition in definitions:
> +-            if all(not isinstance(d, dict) for d in definition.itervalues()):
> ++            if all(not isinstance(d, dict) for d in definition.values()):
> +                 definition = {None: definition}
> +-            for key, value in definition.iteritems():
> ++            for key, value in definition.items():
> +                 self.setdefault(key, {}).update(value)
> +
> +     def __call__(self, stdin, args):
> +@@ -178,14 +178,14 @@ class FakeCompiler(dict):
> +             pp = CompilerPreprocessor(self[None])
> +
> +             def apply_defn(defn):
> +-                for k, v in defn.iteritems():
> ++                for k, v in defn.items():
> +                     if v is False:
> +                         if k in pp.context:
> +                             del pp.context[k]
> +                     else:
> +                         pp.context[k] = v
> +
> +-            for glob, defn in self.iteritems():
> ++            for glob, defn in self.items():
> +                 if glob and not glob.startswith('-') and fnmatch(file, glob):
> +                     apply_defn(defn)
> +
> +@@ -216,7 +216,7 @@ class TestFakeCompiler(unittest.TestCase):
> +                 'A': '1',
> +                 'B': '2',
> +             })
> +-            self.assertEquals(compiler(None, ['-E', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', 'file']),
> +                               (0, '1 2 C', ''))
> +
> +             compiler = FakeCompiler({
> +@@ -238,25 +238,25 @@ class TestFakeCompiler(unittest.TestCase):
> +                     'B': '42',
> +                 },
> +             })
> +-            self.assertEquals(compiler(None, ['-E', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', 'file']),
> +                               (0, '1 2 C', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-foo', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-foo', 'file']),
> +                               (0, '1 2 foo', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-bar', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-bar', 'file']),
> +                               (0, '1 bar bar', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-qux', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-qux', 'file']),
> +                               (0, '1 B C', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-foo', '-bar', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-foo', '-bar', 'file']),
> +                               (0, '1 bar bar', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-bar', '-foo', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-bar', '-foo', 'file']),
> +                               (0, '1 bar foo', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-bar', '-qux', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-bar', '-qux', 'file']),
> +                               (0, '1 B bar', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-qux', '-bar', 'file']),
> ++            self.assertEqual(compiler(None, ['-E', '-qux', '-bar', 'file']),
> +                               (0, '1 bar bar', ''))
> +-            self.assertEquals(compiler(None, ['-E', 'file.c']),
> ++            self.assertEqual(compiler(None, ['-E', 'file.c']),
> +                               (0, '1 42 C', ''))
> +-            self.assertEquals(compiler(None, ['-E', '-bar', 'file.c']),
> ++            self.assertEqual(compiler(None, ['-E', '-bar', 'file.c']),
> +                               (0, '1 bar bar', ''))
> +
> +     def test_multiple_definitions(self):
> +@@ -267,7 +267,7 @@ class TestFakeCompiler(unittest.TestCase):
> +             'C': 3,
> +         })
> +
> +-        self.assertEquals(compiler, {
> ++        self.assertEqual(compiler, {
> +             None: {
> +                 'A': 1,
> +                 'B': 2,
> +@@ -282,7 +282,7 @@ class TestFakeCompiler(unittest.TestCase):
> +             'C': 3,
> +         })
> +
> +-        self.assertEquals(compiler, {
> ++        self.assertEqual(compiler, {
> +             None: {
> +                 'A': 1,
> +                 'B': 4,
> +@@ -302,7 +302,7 @@ class TestFakeCompiler(unittest.TestCase):
> +             },
> +         })
> +
> +-        self.assertEquals(compiler, {
> ++        self.assertEqual(compiler, {
> +             None: {
> +                 'A': 1,
> +                 'B': 4,
> +@@ -330,7 +330,7 @@ class TestFakeCompiler(unittest.TestCase):
> +             },
> +         })
> +
> +-        self.assertEquals(compiler, {
> ++        self.assertEqual(compiler, {
> +             None: {
> +                 'A': 1,
> +                 'B': 2,
> +@@ -370,7 +370,7 @@ class CompilerResult(ReadOnlyNamespace):
> +     def __add__(self, other):
> +         assert isinstance(other, dict)
> +         result = copy.deepcopy(self.__dict__)
> +-        for k, v in other.iteritems():
> ++        for k, v in other.items():
> +             if k == 'flags':
> +                 result.setdefault(k, []).extend(v)
> +             else:
> +@@ -381,7 +381,7 @@ class CompilerResult(ReadOnlyNamespace):
> + class TestCompilerResult(unittest.TestCase):
> +     def test_compiler_result(self):
> +         result = CompilerResult()
> +-        self.assertEquals(result.__dict__, {
> ++        self.assertEqual(result.__dict__, {
> +             'wrapper': [],
> +             'compiler': mozpath.abspath(''),
> +             'version': '',
> +@@ -397,7 +397,7 @@ class TestCompilerResult(unittest.TestCase):
> +             language='C',
> +             flags=['-std=gnu99'],
> +         )
> +-        self.assertEquals(result.__dict__, {
> ++        self.assertEqual(result.__dict__, {
> +             'wrapper': [],
> +             'compiler': mozpath.abspath('/usr/bin/gcc'),
> +             'version': '4.2.1',
> +@@ -407,7 +407,7 @@ class TestCompilerResult(unittest.TestCase):
> +         })
> +
> +         result2 = result + {'flags': ['-m32']}
> +-        self.assertEquals(result2.__dict__, {
> ++        self.assertEqual(result2.__dict__, {
> +             'wrapper': [],
> +             'compiler': mozpath.abspath('/usr/bin/gcc'),
> +             'version': '4.2.1',
> +@@ -416,14 +416,14 @@ class TestCompilerResult(unittest.TestCase):
> +             'flags': ['-std=gnu99', '-m32'],
> +         })
> +         # Original flags are untouched.
> +-        self.assertEquals(result.flags, ['-std=gnu99'])
> ++        self.assertEqual(result.flags, ['-std=gnu99'])
> +
> +         result3 = result + {
> +             'compiler': '/usr/bin/gcc-4.7',
> +             'version': '4.7.3',
> +             'flags': ['-m32'],
> +         }
> +-        self.assertEquals(result3.__dict__, {
> ++        self.assertEqual(result3.__dict__, {
> +             'wrapper': [],
> +             'compiler': mozpath.abspath('/usr/bin/gcc-4.7'),
> +             'version': '4.7.3',
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py b/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py
> +index ac35d745f..cdd8ece1b 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_toolkit_moz_configure.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import os
> +
> +diff --git a/python/mozbuild/mozbuild/test/configure/test_util.py b/python/mozbuild/mozbuild/test/configure/test_util.py
> +index 9f9575fd0..c2db1a628 100644
> +--- a/python/mozbuild/mozbuild/test/configure/test_util.py
> ++++ b/python/mozbuild/mozbuild/test/configure/test_util.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function, unicode_literals
> ++
> +
> + import logging
> + import os
> +@@ -11,7 +11,7 @@ import textwrap
> + import unittest
> + import sys
> +
> +-from StringIO import StringIO
> ++from io import StringIO
> +
> + from mozunit import main
> + from mozpack import path as mozpath
> +@@ -434,11 +434,11 @@ class TestLogSubprocessOutput(unittest.TestCase):
> +         except SystemExit as e:
> +             status = e.code
> +
> +-        self.assertEquals(status, 0)
> ++        self.assertEqual(status, 0)
> +         quote_char = "'"
> +         if getpreferredencoding().lower() == 'utf-8':
> +             quote_char = '\u00B4'.encode('utf-8')
> +-        self.assertEquals(out.getvalue().strip(), quote_char)
> ++        self.assertEqual(out.getvalue().strip(), quote_char)
> +
> +
> + class TestVersion(unittest.TestCase):
> +diff --git a/python/mozbuild/mozbuild/testing.py b/python/mozbuild/mozbuild/testing.py
> +index 3229c3f77..82d250fab 100644
> +--- a/python/mozbuild/mozbuild/testing.py
> ++++ b/python/mozbuild/mozbuild/testing.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> +
> +-import cPickle as pickle
> ++
> ++import pickle as pickle
> + import os
> + import sys
> +
> +@@ -70,7 +70,7 @@ REFTEST_FLAVORS = ('crashtest', 'reftest')
> + WEB_PLATFORM_TESTS_FLAVORS = ('web-platform-tests',)
> +
> + def all_test_flavors():
> +-    return ([v[0] for v in TEST_MANIFESTS.values()] +
> ++    return ([v[0] for v in list(TEST_MANIFESTS.values())] +
> +             list(REFTEST_FLAVORS) +
> +             list(WEB_PLATFORM_TESTS_FLAVORS))
> +
> +@@ -210,7 +210,7 @@ def install_test_files(topsrcdir, topobjdir, tests_root, test_objs):
> +     only a few tests need to be run.
> +     """
> +     flavor_info = {flavor: (root, prefix, install)
> +-                   for (flavor, root, prefix, install) in TEST_MANIFESTS.values()}
> ++                   for (flavor, root, prefix, install) in list(TEST_MANIFESTS.values())}
> +     objdir_dest = mozpath.join(topobjdir, tests_root)
> +
> +     converter = SupportFilesConverter()
> +@@ -292,7 +292,7 @@ def read_wpt_manifest(context, paths):
> +         paths_file = os.path.join(context.config.topsrcdir, "testing",
> +                                   "web-platform", "tests", "tools", "localpaths.py")
> +         _globals = {"__file__": paths_file}
> +-        execfile(paths_file, _globals)
> ++        exec(compile(open(paths_file, "rb").read(), paths_file, 'exec'), _globals)
> +         import manifest as wptmanifest
> +     finally:
> +         sys.path = old_path
> +diff --git a/python/mozbuild/mozbuild/util.py b/python/mozbuild/mozbuild/util.py
> +index 4ea227dc0..79cb15713 100644
> +--- a/python/mozbuild/mozbuild/util.py
> ++++ b/python/mozbuild/mozbuild/util.py
> +@@ -5,7 +5,7 @@
> + # This file contains miscellaneous utility functions that don't belong anywhere
> + # in particular.
> +
> +-from __future__ import absolute_import, unicode_literals, print_function
> ++
> +
> + import argparse
> + import collections
> +@@ -21,6 +21,9 @@ import stat
> + import sys
> + import time
> + import types
> ++import pprint
> ++import six
> ++import subprocess
> +
> + from collections import (
> +     defaultdict,
> +@@ -36,7 +39,7 @@ from io import (
> + if sys.version_info[0] == 3:
> +     str_type = str
> + else:
> +-    str_type = basestring
> ++    str_type = str
> +
> + if sys.platform == 'win32':
> +     _kernel32 = ctypes.windll.kernel32
> +@@ -78,7 +81,7 @@ def hash_file(path, hasher=None):
> +     return h.hexdigest()
> +
> +
> +-class EmptyValue(unicode):
> ++class EmptyValue(str):
> +     """A dummy type that behaves like an empty string and sequence.
> +
> +     This type exists in order to support
> +@@ -92,7 +95,7 @@ class EmptyValue(unicode):
> + class ReadOnlyNamespace(object):
> +     """A class for objects with immutable attributes set at initialization."""
> +     def __init__(self, **kwargs):
> +-        for k, v in kwargs.iteritems():
> ++        for k, v in kwargs.items():
> +             super(ReadOnlyNamespace, self).__setattr__(k, v)
> +
> +     def __delattr__(self, key):
> +@@ -224,7 +227,7 @@ class FileAvoidWrite(BytesIO):
> +         self.mode = mode
> +
> +     def write(self, buf):
> +-        if isinstance(buf, unicode):
> ++        if isinstance(buf, str):
> +             buf = buf.encode('utf-8')
> +         BytesIO.write(self, buf)
> +
> +@@ -267,6 +270,10 @@ class FileAvoidWrite(BytesIO):
> +             if 'b' in self.mode:
> +                 writemode += 'b'
> +             with open(self.name, writemode) as file:
> ++                if 'b' in self.mode and isinstance(buf, str):
> ++                    buf = buf.encode('utf-8')
> ++                elif 'b' not in self.mode and isinstance(buf, bytes):
> ++                    buf = buf.decode('utf-8')
> +                 file.write(buf)
> +
> +         if self._capture_diff:
> +@@ -381,7 +388,7 @@ class ListMixin(object):
> +     def __add__(self, other):
> +         # Allow None and EmptyValue is a special case because it makes undefined
> +         # variable references in moz.build behave better.
> +-        other = [] if isinstance(other, (types.NoneType, EmptyValue)) else other
> ++        other = [] if isinstance(other, (type(None), EmptyValue)) else other
> +         if not isinstance(other, list):
> +             raise ValueError('Only lists can be appended to lists.')
> +
> +@@ -390,7 +397,7 @@ class ListMixin(object):
> +         return new_list
> +
> +     def __iadd__(self, other):
> +-        other = [] if isinstance(other, (types.NoneType, EmptyValue)) else other
> ++        other = [] if isinstance(other, (type(None), EmptyValue)) else other
> +         if not isinstance(other, list):
> +             raise ValueError('Only lists can be appended to lists.')
> +
> +@@ -561,14 +568,14 @@ def FlagsFactory(flags):
> +     functions below.
> +     """
> +     assert isinstance(flags, dict)
> +-    assert all(isinstance(v, type) for v in flags.values())
> ++    assert all(isinstance(v, type) for v in list(flags.values()))
> +
> +     class Flags(object):
> +-        __slots__ = flags.keys()
> ++        __slots__ = list(flags.keys())
> +         _flags = flags
> +
> +         def update(self, **kwargs):
> +-            for k, v in kwargs.iteritems():
> ++            for k, v in kwargs.items():
> +                 setattr(self, k, v)
> +
> +         def __getattr__(self, name):
> +@@ -1006,8 +1013,6 @@ def TypedNamedTuple(name, fields):
> +                                     'got %s, expected %s' % (fname,
> +                                     type(value), ftype))
> +
> +-            super(TypedTuple, self).__init__(*args, **kwargs)
> +-
> +     TypedTuple._fields = fields
> +
> +     return TypedTuple
> +@@ -1099,14 +1104,14 @@ def group_unified_files(files, unified_prefix, unified_suffix,
> +     # issue.  So we do a little dance to filter it out ourselves.
> +     dummy_fill_value = ("dummy",)
> +     def filter_out_dummy(iterable):
> +-        return itertools.ifilter(lambda x: x != dummy_fill_value,
> ++        return filter(lambda x: x != dummy_fill_value,
> +                                  iterable)
> +
> +     # From the itertools documentation, slightly modified:
> +     def grouper(n, iterable):
> +         "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
> +         args = [iter(iterable)] * n
> +-        return itertools.izip_longest(fillvalue=dummy_fill_value, *args)
> ++        return itertools.zip_longest(fillvalue=dummy_fill_value, *args)
> +
> +     for i, unified_group in enumerate(grouper(files_per_unified_file,
> +                                               files)):
> +@@ -1123,7 +1128,7 @@ def pair(iterable):
> +         [(1,2), (3,4), (5,6)]
> +     '''
> +     i = iter(iterable)
> +-    return itertools.izip_longest(i, i)
> ++    return itertools.zip_longest(i, i)
> +
> +
> + VARIABLES_RE = re.compile('\$\((\w+)\)')
> +@@ -1141,7 +1146,7 @@ def expand_variables(s, variables):
> +         value = variables.get(name)
> +         if not value:
> +             continue
> +-        if not isinstance(value, types.StringTypes):
> ++        if not isinstance(value, (str,)):
> +             value = ' '.join(value)
> +         result += value
> +     return result
> +@@ -1168,7 +1173,7 @@ class EnumStringComparisonError(Exception):
> +     pass
> +
> +
> +-class EnumString(unicode):
> ++class EnumString(str):
> +     '''A string type that only can have a limited set of values, similarly to
> +     an Enum, and can only be compared against that set of values.
> +
> +@@ -1185,8 +1190,8 @@ class EnumString(unicode):
> +     def __eq__(self, other):
> +         if other not in self.POSSIBLE_VALUES:
> +             raise EnumStringComparisonError(
> +-                'Can only compare with %s'
> +-                % ', '.join("'%s'" % v for v in self.POSSIBLE_VALUES))
> ++                '%s is not in %s'
> ++                % (other, ', '.join("'%s'" % v for v in self.POSSIBLE_VALUES)))
> +         return super(EnumString, self).__eq__(other)
> +
> +     def __ne__(self, other):
> +@@ -1204,14 +1209,14 @@ def _escape_char(c):
> +     # quoting could be done with either ' or ".
> +     if c == "'":
> +         return "\\'"
> +-    return unicode(c.encode('unicode_escape'))
> ++    return str(c.encode('unicode_escape'))
> +
> + # Mapping table between raw characters below \x80 and their escaped
> + # counterpart, when they differ
> + _INDENTED_REPR_TABLE = {
> +     c: e
> +     for c, e in map(lambda x: (x, _escape_char(x)),
> +-                    map(unichr, range(128)))
> ++                    map(chr, range(128)))
> +     if c != e
> + }
> + # Regexp matching all characters to escape.
> +@@ -1219,7 +1224,33 @@ _INDENTED_REPR_RE = re.compile(
> +     '([' + ''.join(_INDENTED_REPR_TABLE.values()) + ']+)')
> +
> +
> ++# Stolen from gecko master [1]
> ++# [1] https://github.com/mozilla/gecko-dev/blob/4165a2e843c494bfb3e35d8a1fbf9c61209e3675/python/mozbuild/mozbuild/util.py#L1286
> ++
> ++# The default PrettyPrinter has some issues with UTF-8, so we need to override
> ++# some stuff here.
> ++class _PrettyPrinter(pprint.PrettyPrinter):
> ++    def format(self, object, context, maxlevels, level):
> ++        if not (isinstance(object, six.text_type) or
> ++                isinstance(object, six.binary_type)):
> ++            return super(_PrettyPrinter, self).format(
> ++                object, context, maxlevels, level)
> ++        # This is super hacky and weird, but the output of 'repr' actually
> ++        # varies based on the default I/O encoding of the process, which isn't
> ++        # necessarily utf-8. Instead we open a new shell and ask what the repr
> ++        # WOULD be assuming the default encoding is utf-8. If you can come up
> ++        # with a better way of doing this without simply re-implementing the
> ++        # logic of "repr", please replace this.
> ++        env = dict(os.environ)
> ++        env['PYTHONIOENCODING'] = 'utf-8'
> ++        ret = six.ensure_text(subprocess.check_output(
> ++            [sys.executable], input='print(repr(%s))' % repr(object),
> ++            universal_newlines=True, env=env, encoding='utf-8')).strip()
> ++        return (ret, True, False)
> ++
> + def indented_repr(o, indent=4):
> ++    return _PrettyPrinter(indent=indent).pformat(o)
> ++
> +     '''Similar to repr(), but returns an indented representation of the object
> +
> +     One notable difference with repr is that the returned representation
> +@@ -1242,7 +1273,7 @@ def indented_repr(o, indent=4):
> +         elif isinstance(o, bytes):
> +             yield 'b'
> +             yield repr(o)
> +-        elif isinstance(o, unicode):
> ++        elif isinstance(o, str):
> +             yield "'"
> +             # We want a readable string (non escaped unicode), but some
> +             # special characters need escaping (e.g. \n, \t, etc.)
> +@@ -1272,11 +1303,11 @@ def encode(obj, encoding='utf-8'):
> +     if isinstance(obj, dict):
> +         return {
> +             encode(k, encoding): encode(v, encoding)
> +-            for k, v in obj.iteritems()
> ++            for k, v in obj.items()
> +         }
> +     if isinstance(obj, bytes):
> +         return obj
> +-    if isinstance(obj, unicode):
> ++    if isinstance(obj, str):
> +         return obj.encode(encoding)
> +     if isinstance(obj, Iterable):
> +         return [encode(i, encoding) for i in obj]
> +diff --git a/python/mozbuild/mozbuild/virtualenv.py b/python/mozbuild/mozbuild/virtualenv.py
> +index 38d06d71d..c67c046f3 100644
> +--- a/python/mozbuild/mozbuild/virtualenv.py
> ++++ b/python/mozbuild/mozbuild/virtualenv.py
> +@@ -531,9 +531,9 @@ def verify_python_version(log_handle):
> +
> +     our = LooseVersion('%d.%d.%d' % (major, minor, micro))
> +
> +-    if major != MINIMUM_PYTHON_MAJOR or our < MINIMUM_PYTHON_VERSION:
> +-        log_handle.write('Python %s or greater (but not Python 3) is '
> +-            'required to build. ' % MINIMUM_PYTHON_VERSION)
> ++    if our < MINIMUM_PYTHON_VERSION:
> ++        log_handle.write('Python %s or greater is required to build. '
> ++            % MINIMUM_PYTHON_VERSION)
> +         log_handle.write('You are running Python %s.\n' % our)
> +
> +         if os.name in ('nt', 'ce'):
> +diff --git a/python/mozbuild/mozpack/chrome/manifest.py b/python/mozbuild/mozpack/chrome/manifest.py
> +index c91b99cf1..02eac0dbb 100644
> +--- a/python/mozbuild/mozpack/chrome/manifest.py
> ++++ b/python/mozbuild/mozpack/chrome/manifest.py
> +@@ -2,11 +2,11 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import re
> + import os
> +-from urlparse import urlparse
> ++from urllib.parse import urlparse
> + import mozpack.path as mozpath
> + from mozpack.chrome.flags import Flags
> + from mozpack.errors import errors
> +@@ -316,7 +316,7 @@ class ManifestContract(ManifestEntry):
> +         return self.serialize(self.contractID, self.cid)
> +
> + # All manifest classes by their type name.
> +-MANIFESTS_TYPES = dict([(c.type, c) for c in globals().values()
> ++MANIFESTS_TYPES = dict([(c.type, c) for c in list(globals().values())
> +                        if type(c) == type and issubclass(c, ManifestEntry)
> +                        and hasattr(c, 'type') and c.type])
> +
> +diff --git a/python/mozbuild/mozpack/copier.py b/python/mozbuild/mozpack/copier.py
> +index 1e521e52b..43ed9be4a 100644
> +--- a/python/mozbuild/mozpack/copier.py
> ++++ b/python/mozbuild/mozpack/copier.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import os
> + import stat
> +@@ -113,7 +113,7 @@ class FileRegistry(object):
> +         '''
> +         Return all paths stored in the container, in the order they were added.
> +         '''
> +-        return self._files.keys()
> ++        return list(self._files.keys())
> +
> +     def __len__(self):
> +         '''
> +@@ -146,7 +146,7 @@ class FileRegistry(object):
> +             for path, file in registry:
> +                 (...)
> +         '''
> +-        return self._files.iteritems()
> ++        return iter(self._files.items())
> +
> +     def required_directories(self):
> +         '''
> +@@ -155,7 +155,7 @@ class FileRegistry(object):
> +         unspecified (virtual) root directory (and do not include said root
> +         directory).
> +         '''
> +-        return set(k for k, v in self._required_directories.items() if v > 0)
> ++        return set(k for k, v in list(self._required_directories.items()) if v > 0)
> +
> +     def output_to_inputs_tree(self):
> +         '''
> +@@ -295,7 +295,7 @@ class FileCopier(FileRegistry):
> +
> +         Returns a FileCopyResult that details what changed.
> +         '''
> +-        assert isinstance(destination, basestring)
> ++        assert isinstance(destination, str)
> +         assert not os.path.exists(destination) or os.path.isdir(destination)
> +
> +         result = FileCopyResult()
> +@@ -563,7 +563,7 @@ class Jarrer(FileRegistry, BaseFile):
> +             def exists(self):
> +                 return self.deflater is not None
> +
> +-        if isinstance(dest, basestring):
> ++        if isinstance(dest, str):
> +             dest = Dest(dest)
> +         assert isinstance(dest, Dest)
> +
> +diff --git a/python/mozbuild/mozpack/files.py b/python/mozbuild/mozpack/files.py
> +index 8ce353375..bf35e39b8 100644
> +--- a/python/mozbuild/mozpack/files.py
> ++++ b/python/mozbuild/mozpack/files.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import errno
> + import os
> +@@ -57,7 +57,7 @@ else:
> +
> +     def _copyfile(src, dest):
> +         # False indicates `dest` should be overwritten if it exists already.
> +-        if isinstance(src, unicode) and isinstance(dest, unicode):
> ++        if isinstance(src, str) and isinstance(dest, str):
> +             _CopyFileW(src, dest, False)
> +         elif isinstance(src, str) and isinstance(dest, str):
> +             _CopyFileA(src, dest, False)
> +@@ -164,7 +164,7 @@ class BaseFile(object):
> +         disabled when skip_if_older is False.
> +         Returns whether a copy was actually performed (True) or not (False).
> +         '''
> +-        if isinstance(dest, basestring):
> ++        if isinstance(dest, str):
> +             dest = Dest(dest)
> +         else:
> +             assert isinstance(dest, Dest)
> +@@ -278,11 +278,11 @@ class ExecutableFile(File):
> +     '''
> +     def copy(self, dest, skip_if_older=True):
> +         real_dest = dest
> +-        if not isinstance(dest, basestring):
> ++        if not isinstance(dest, str):
> +             fd, dest = mkstemp()
> +             os.close(fd)
> +             os.remove(dest)
> +-        assert isinstance(dest, basestring)
> ++        assert isinstance(dest, str)
> +         # If File.copy didn't actually copy because dest is newer, check the
> +         # file sizes. If dest is smaller, it means it is already stripped and
> +         # elfhacked, so we can skip.
> +@@ -319,7 +319,7 @@ class AbsoluteSymlinkFile(File):
> +         File.__init__(self, path)
> +
> +     def copy(self, dest, skip_if_older=True):
> +-        assert isinstance(dest, basestring)
> ++        assert isinstance(dest, str)
> +
> +         # The logic in this function is complicated by the fact that symlinks
> +         # aren't universally supported. So, where symlinks aren't supported, we
> +@@ -410,7 +410,7 @@ class HardlinkFile(File):
> +     '''
> +
> +     def copy(self, dest, skip_if_older=True):
> +-        assert isinstance(dest, basestring)
> ++        assert isinstance(dest, str)
> +
> +         if not hasattr(os, 'link'):
> +             return super(HardlinkFile, self).copy(
> +@@ -471,7 +471,7 @@ class ExistingFile(BaseFile):
> +         self.required = required
> +
> +     def copy(self, dest, skip_if_older=True):
> +-        if isinstance(dest, basestring):
> ++        if isinstance(dest, str):
> +             dest = Dest(dest)
> +         else:
> +             assert isinstance(dest, Dest)
> +@@ -517,7 +517,7 @@ class PreprocessedFile(BaseFile):
> +         '''
> +         Invokes the preprocessor to create the destination file.
> +         '''
> +-        if isinstance(dest, basestring):
> ++        if isinstance(dest, str):
> +             dest = Dest(dest)
> +         else:
> +             assert isinstance(dest, Dest)
> +@@ -657,7 +657,7 @@ class XPTFile(GeneratedFile):
> +         the individual XPTs to link.
> +         skip_if_older is ignored.
> +         '''
> +-        if isinstance(dest, basestring):
> ++        if isinstance(dest, str):
> +             dest = Dest(dest)
> +         assert isinstance(dest, Dest)
> +
> +@@ -1108,7 +1108,7 @@ class ComposedFinder(BaseFinder):
> +         from mozpack.copier import FileRegistry
> +         self.files = FileRegistry()
> +
> +-        for base, finder in sorted(finders.iteritems()):
> ++        for base, finder in sorted(finders.items()):
> +             if self.files.contains(base):
> +                 self.files.remove(base)
> +             for p, f in finder.find(''):
> +diff --git a/python/mozbuild/mozpack/manifests.py b/python/mozbuild/mozpack/manifests.py
> +index 27c66634b..f79b40086 100644
> +--- a/python/mozbuild/mozpack/manifests.py
> ++++ b/python/mozbuild/mozpack/manifests.py
> +@@ -2,8 +2,6 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, unicode_literals
> +-
> + from contextlib import contextmanager
> + import json
> +
> +@@ -116,7 +114,7 @@ class InstallManifest(object):
> +         self._source_files = set()
> +
> +         if path or fileobj:
> +-            with _auto_fileobj(path, fileobj, 'rb') as fh:
> ++            with _auto_fileobj(path, fileobj, 'r') as fh:
> +                 self._source_files.add(fh.name)
> +                 self._load_from_fileobj(fh)
> +
> +@@ -175,7 +173,7 @@ class InstallManifest(object):
> +                 dest, content = fields[1:]
> +
> +                 self.add_content(
> +-                    self._decode_field_entry(content).encode('utf-8'), dest)
> ++                    self._decode_field_entry(content), dest)
> +                 continue
> +
> +             # Don't fail for non-actionable items, allowing
> +@@ -228,7 +226,7 @@ class InstallManifest(object):
> +
> +         It is an error if both are specified.
> +         """
> +-        with _auto_fileobj(path, fileobj, 'wb') as fh:
> ++        with _auto_fileobj(path, fileobj, 'w') as fh:
> +             fh.write('%d\n' % self.CURRENT_VERSION)
> +
> +             for dest in sorted(self._dests):
> +@@ -242,13 +240,11 @@ class InstallManifest(object):
> +                     for path in paths:
> +                         source = mozpath.join(base, path)
> +                         parts = ['%d' % type, mozpath.join(dest, path), source]
> +-                        fh.write('%s\n' % self.FIELD_SEPARATOR.join(
> +-                            p.encode('utf-8') for p in parts))
> ++                        fh.write('%s\n' % self.FIELD_SEPARATOR.join(parts))
> +                 else:
> +                     parts = ['%d' % entry[0], dest]
> +                     parts.extend(entry[1:])
> +-                    fh.write('%s\n' % self.FIELD_SEPARATOR.join(
> +-                        p.encode('utf-8') for p in parts))
> ++                    fh.write('%s\n' % self.FIELD_SEPARATOR.join(parts))
> +
> +     def add_link(self, source, dest):
> +         """Add a link to this manifest.
> +@@ -439,7 +435,7 @@ class InstallManifest(object):
> +             if install_type == self.CONTENT:
> +                 # GeneratedFile expect the buffer interface, which the unicode
> +                 # type doesn't have, so encode to a str.
> +-                content = self._decode_field_entry(entry[1]).encode('utf-8')
> ++                content = self._decode_field_entry(entry[1])
> +                 registry.add(dest, GeneratedFile(content))
> +                 continue
> +
> +diff --git a/python/mozbuild/mozpack/mozjar.py b/python/mozbuild/mozpack/mozjar.py
> +index a723fd2c0..0b04d233c 100644
> +--- a/python/mozbuild/mozpack/mozjar.py
> ++++ b/python/mozbuild/mozpack/mozjar.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this
> + # file, You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + from io import BytesIO
> + import struct
> +@@ -14,9 +14,10 @@ from zipfile import (
> +     ZIP_DEFLATED,
> + )
> + from collections import OrderedDict
> +-from urlparse import urlparse, ParseResult
> ++from urllib.parse import urlparse, ParseResult
> + import mozpack.path as mozpath
> + from mozbuild.util import memoize
> ++from functools import reduce
> +
> +
> + JAR_STORED = ZIP_STORED
> +@@ -72,7 +73,7 @@ class JarStruct(object):
> +         an instance with empty fields.
> +         '''
> +         assert self.MAGIC and isinstance(self.STRUCT, OrderedDict)
> +-        self.size_fields = set(t for t in self.STRUCT.itervalues()
> ++        self.size_fields = set(t for t in self.STRUCT.values()
> +                                if not t in JarStruct.TYPE_MAPPING)
> +         self._values = {}
> +         if data:
> +@@ -94,7 +95,7 @@ class JarStruct(object):
> +         # For all fields used as other fields sizes, keep track of their value
> +         # separately.
> +         sizes = dict((t, 0) for t in self.size_fields)
> +-        for name, t in self.STRUCT.iteritems():
> ++        for name, t in self.STRUCT.items():
> +             if t in JarStruct.TYPE_MAPPING:
> +                 value, size = JarStruct.get_data(t, data[offset:])
> +             else:
> +@@ -113,7 +114,7 @@ class JarStruct(object):
> +         Initialize an instance with empty fields.
> +         '''
> +         self.signature = self.MAGIC
> +-        for name, t in self.STRUCT.iteritems():
> ++        for name, t in self.STRUCT.items():
> +             if name in self.size_fields:
> +                 continue
> +             self._values[name] = 0 if t in JarStruct.TYPE_MAPPING else ''
> +@@ -138,9 +139,9 @@ class JarStruct(object):
> +         from self.STRUCT.
> +         '''
> +         serialized = struct.pack('<I', self.signature)
> +-        sizes = dict((t, name) for name, t in self.STRUCT.iteritems()
> ++        sizes = dict((t, name) for name, t in self.STRUCT.items()
> +                      if not t in JarStruct.TYPE_MAPPING)
> +-        for name, t in self.STRUCT.iteritems():
> ++        for name, t in self.STRUCT.items():
> +             if t in JarStruct.TYPE_MAPPING:
> +                 format, size = JarStruct.TYPE_MAPPING[t]
> +                 if name in sizes:
> +@@ -159,7 +160,7 @@ class JarStruct(object):
> +         variable length fields.
> +         '''
> +         size = JarStruct.TYPE_MAPPING['uint32'][1]
> +-        for name, type in self.STRUCT.iteritems():
> ++        for name, type in self.STRUCT.items():
> +             if type in JarStruct.TYPE_MAPPING:
> +                 size += JarStruct.TYPE_MAPPING[type][1]
> +             else:
> +@@ -180,7 +181,7 @@ class JarStruct(object):
> +         return key in self._values
> +
> +     def __iter__(self):
> +-        return self._values.iteritems()
> ++        return iter(self._values.items())
> +
> +     def __repr__(self):
> +         return "<%s %s>" % (self.__class__.__name__,
> +@@ -374,7 +375,7 @@ class JarReader(object):
> +         entries = self.entries
> +         if not entries:
> +             return JAR_STORED
> +-        return max(f['compression'] for f in entries.itervalues())
> ++        return max(f['compression'] for f in entries.values())
> +
> +     @property
> +     def entries(self):
> +@@ -390,7 +391,7 @@ class JarReader(object):
> +             preload = JarStruct.get_data('uint32', self._data)[0]
> +         entries = OrderedDict()
> +         offset = self._cdir_end['cdir_offset']
> +-        for e in xrange(self._cdir_end['cdir_entries']):
> ++        for e in range(self._cdir_end['cdir_entries']):
> +             entry = JarCdirEntry(self._data[offset:])
> +             offset += entry.size
> +             # Creator host system. 0 is MSDOS, 3 is Unix
> +@@ -452,7 +453,7 @@ class JarReader(object):
> +             for file in jarReader:
> +                 ...
> +         '''
> +-        for entry in self.entries.itervalues():
> ++        for entry in self.entries.values():
> +             yield self._getreader(entry)
> +
> +     def __getitem__(self, name):
> +@@ -547,7 +548,7 @@ class JarWriter(object):
> +         headers = {}
> +         preload_size = 0
> +         # Prepare central directory entries
> +-        for entry, content in self._contents.itervalues():
> ++        for entry, content in self._contents.values():
> +             header = JarLocalFileHeader()
> +             for name in entry.STRUCT:
> +                 if name in header:
> +@@ -562,7 +563,7 @@ class JarWriter(object):
> +         end['disk_entries'] = len(self._contents)
> +         end['cdir_entries'] = end['disk_entries']
> +         end['cdir_size'] = reduce(lambda x, y: x + y[0].size,
> +-                                  self._contents.values(), 0)
> ++                                  list(self._contents.values()), 0)
> +         # On optimized archives, store the preloaded size and the central
> +         # directory entries, followed by the first end of central directory.
> +         if self._optimize:
> +@@ -571,18 +572,18 @@ class JarWriter(object):
> +             if preload_size:
> +                 preload_size += offset
> +             self._data.write(struct.pack('<I', preload_size))
> +-            for entry, _ in self._contents.itervalues():
> ++            for entry, _ in self._contents.values():
> +                 entry['offset'] += offset
> +                 self._data.write(entry.serialize())
> +             self._data.write(end.serialize())
> +         # Store local file entries followed by compressed data
> +-        for entry, content in self._contents.itervalues():
> ++        for entry, content in self._contents.values():
> +             self._data.write(headers[entry].serialize())
> +             self._data.write(content)
> +         # On non optimized archives, store the central directory entries.
> +         if not self._optimize:
> +             end['cdir_offset'] = offset
> +-            for entry, _ in self._contents.itervalues():
> ++            for entry, _ in self._contents.values():
> +                 self._data.write(entry.serialize())
> +         # Store the end of central directory.
> +         self._data.write(end.serialize())
> +@@ -622,7 +623,7 @@ class JarWriter(object):
> +             deflater = data
> +         else:
> +             deflater = Deflater(compress, compress_level=self._compress_level)
> +-            if isinstance(data, basestring):
> ++            if isinstance(data, str):
> +                 deflater.write(data)
> +             elif hasattr(data, 'read'):
> +                 if hasattr(data, 'seek'):
> +diff --git a/testing/mozbase/manifestparser/manifestparser/ini.py b/testing/mozbase/manifestparser/manifestparser/ini.py
> +index e5ba249c1..c141a18b7 100644
> +--- a/testing/mozbase/manifestparser/manifestparser/ini.py
> ++++ b/testing/mozbase/manifestparser/manifestparser/ini.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this file,
> + # You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import
> ++
> +
> + import os
> + import sys
> +@@ -12,7 +12,7 @@ __all__ = ['read_ini', 'combine_fields']
> +
> + class IniParseError(Exception):
> +     def __init__(self, fp, linenum, msg):
> +-        if isinstance(fp, basestring):
> ++        if isinstance(fp, str):
> +             path = fp
> +         elif hasattr(fp, 'name'):
> +             path = fp.name
> +@@ -43,12 +43,15 @@ def read_ini(fp, variables=None, default='DEFAULT', defaults_only=False,
> +     sections = []
> +     key = value = None
> +     section_names = set()
> +-    if isinstance(fp, basestring):
> ++    if isinstance(fp, str):
> +         fp = file(fp)
> +
> +     # read the lines
> +     for (linenum, line) in enumerate(fp.read().splitlines(), start=1):
> +
> ++        if isinstance(line, bytes):
> ++           line = line.decode('utf-8')
> ++
> +         stripped = line.strip()
> +
> +         # ignore blank lines
> +@@ -66,7 +69,7 @@ def read_ini(fp, variables=None, default='DEFAULT', defaults_only=False,
> +         inline_prefixes = {p: -1 for p in comments}
> +         while comment_start == sys.maxsize and inline_prefixes:
> +             next_prefixes = {}
> +-            for prefix, index in inline_prefixes.items():
> ++            for prefix, index in list(inline_prefixes.items()):
> +                 index = line.find(prefix, index+1)
> +                 if index == -1:
> +                     continue
> +@@ -163,7 +166,7 @@ def combine_fields(global_vars, local_vars):
> +         'support-files': '%s %s',
> +     }
> +     final_mapping = global_vars.copy()
> +-    for field_name, value in local_vars.items():
> ++    for field_name, value in list(local_vars.items()):
> +         if field_name not in field_patterns or field_name not in global_vars:
> +             final_mapping[field_name] = value
> +             continue
> +diff --git a/testing/mozbase/manifestparser/manifestparser/manifestparser.py b/testing/mozbase/manifestparser/manifestparser/manifestparser.py
> +index 921369fd2..5b2f4c453 100755
> +--- a/testing/mozbase/manifestparser/manifestparser/manifestparser.py
> ++++ b/testing/mozbase/manifestparser/manifestparser/manifestparser.py
> +@@ -2,9 +2,9 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this file,
> + # You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function
> +
> +-from StringIO import StringIO
> ++
> ++from io import StringIO
> + import json
> + import fnmatch
> + import os
> +@@ -23,7 +23,7 @@ from .filters import (
> + __all__ = ['ManifestParser', 'TestManifest', 'convert']
> +
> + relpath = os.path.relpath
> +-string = (basestring,)
> ++string = (str,)
> +
> +
> + # path normalization
> +@@ -195,7 +195,7 @@ class ManifestParser(object):
> +
> +             # otherwise an item
> +             # apply ancestor defaults, while maintaining current file priority
> +-            data = dict(self._ancestor_defaults.items() + data.items())
> ++            data = dict(list(self._ancestor_defaults.items()) + list(data.items()))
> +
> +             test = data
> +             test['name'] = section
> +@@ -323,19 +323,19 @@ class ManifestParser(object):
> +         # make some check functions
> +         if inverse:
> +             def has_tags(test):
> +-                return not tags.intersection(test.keys())
> ++                return not tags.intersection(list(test.keys()))
> +
> +             def dict_query(test):
> +-                for key, value in kwargs.items():
> ++                for key, value in list(kwargs.items()):
> +                     if test.get(key) == value:
> +                         return False
> +                 return True
> +         else:
> +             def has_tags(test):
> +-                return tags.issubset(test.keys())
> ++                return tags.issubset(list(test.keys()))
> +
> +             def dict_query(test):
> +-                for key, value in kwargs.items():
> ++                for key, value in list(kwargs.items()):
> +                     if test.get(key) != value:
> +                         return False
> +                 return True
> +@@ -359,7 +359,7 @@ class ManifestParser(object):
> +         if tests is None:
> +             manifests = []
> +             # Make sure to return all the manifests, even ones without tests.
> +-            for manifest in self.manifest_defaults.keys():
> ++            for manifest in list(self.manifest_defaults.keys()):
> +                 if isinstance(manifest, tuple):
> +                     parentmanifest, manifest = manifest
> +                 if manifest not in manifests:
> +@@ -409,7 +409,7 @@ class ManifestParser(object):
> +         """
> +
> +         files = set([])
> +-        if isinstance(directories, basestring):
> ++        if isinstance(directories, str):
> +             directories = [directories]
> +
> +         # get files in directories
> +@@ -476,7 +476,7 @@ class ManifestParser(object):
> +             print('[DEFAULT]', file=fp)
> +             for tag in global_tags:
> +                 print('%s =' % tag, file=fp)
> +-            for key, value in global_kwargs.items():
> ++            for key, value in list(global_kwargs.items()):
> +                 print('%s = %s' % (key, value), file=fp)
> +             print(file=fp)
> +
> +@@ -602,7 +602,7 @@ class ManifestParser(object):
> +         internal function to import directories
> +         """
> +
> +-        if isinstance(pattern, basestring):
> ++        if isinstance(pattern, str):
> +             patterns = [pattern]
> +         else:
> +             patterns = pattern
> +diff --git a/testing/mozbase/mozinfo/mozinfo/mozinfo.py b/testing/mozbase/mozinfo/mozinfo/mozinfo.py
> +index 90c187568..6c5a1f322 100755
> +--- a/testing/mozbase/mozinfo/mozinfo/mozinfo.py
> ++++ b/testing/mozbase/mozinfo/mozinfo/mozinfo.py
> +@@ -8,7 +8,7 @@
> + # linux) to the information; I certainly wouldn't want anyone parsing this
> + # information and having behaviour depend on it
> +
> +-from __future__ import absolute_import, print_function
> ++
> +
> + import os
> + import platform
> +@@ -24,7 +24,7 @@ _os = os
> + class unknown(object):
> +     """marker class for unknown information"""
> +
> +-    def __nonzero__(self):
> ++    def __bool__(self):
> +         return False
> +
> +     def __str__(self):
> +@@ -96,20 +96,17 @@ elif system.startswith(('MINGW', 'MSYS_NT')):
> +     info['os'] = 'win'
> +     os_version = version = unknown
> + elif system == "Linux":
> +-    if hasattr(platform, "linux_distribution"):
> +-        (distro, os_version, codename) = platform.linux_distribution()
> +-    else:
> +-        (distro, os_version, codename) = platform.dist()
> +     if not processor:
> +         processor = machine
> +-    version = "%s %s" % (distro, os_version)
> ++
> ++    distro = 'OE/Yocto'
> ++    os_version = version = unknown
> +
> +     # Bug in Python 2's `platform` library:
> +     # It will return a triple of empty strings if the distribution is not supported.
> +     # It works on Python 3. If we don't have an OS version,
> +     # the unit tests fail to run.
> +     if not distro and not os_version and not codename:
> +-        distro = 'lfs'
> +         version = release
> +         os_version = release
> +
> +@@ -131,7 +128,7 @@ else:
> +     os_version = version = unknown
> +
> + info['version'] = version
> +-info['os_version'] = StringVersion(os_version)
> ++info['os_version'] = version
> +
> + # processor type and bits
> + if processor in ["i386", "i686"]:
> +@@ -188,12 +185,7 @@ def update(new_info):
> +                      to a json file containing the new info.
> +     """
> +
> +-    PY3 = sys.version_info[0] == 3
> +-    if PY3:
> +-        string_types = str,
> +-    else:
> +-        string_types = basestring,
> +-    if isinstance(new_info, string_types):
> ++    if isinstance(new_info, str):
> +         # lazy import
> +         import mozfile
> +         import json
> +@@ -295,7 +287,7 @@ def main(args=None):
> +
> +     # print out choices if requested
> +     flag = False
> +-    for key, value in options.__dict__.items():
> ++    for key, value in list(options.__dict__.items()):
> +         if value is True:
> +             print('%s choices: %s' % (key, ' '.join([str(choice)
> +                                                      for choice in choices[key]])))
> +@@ -304,7 +296,7 @@ def main(args=None):
> +         return
> +
> +     # otherwise, print out all info
> +-    for key, value in info.items():
> ++    for key, value in list(info.items()):
> +         print('%s: %s' % (key, value))
> +
> +
> +diff --git a/testing/mozbase/mozprocess/mozprocess/processhandler.py b/testing/mozbase/mozprocess/mozprocess/processhandler.py
> +index 3efb650b7..2575a4702 100644
> +--- a/testing/mozbase/mozprocess/mozprocess/processhandler.py
> ++++ b/testing/mozbase/mozprocess/mozprocess/processhandler.py
> +@@ -2,7 +2,7 @@
> + # License, v. 2.0. If a copy of the MPL was not distributed with this file,
> + # You can obtain one at http://mozilla.org/MPL/2.0/.
> +
> +-from __future__ import absolute_import, print_function
> ++
> +
> + import errno
> + import os
> +@@ -13,7 +13,7 @@ import threading
> + import time
> + import traceback
> +
> +-from Queue import Queue, Empty
> ++from queue import Queue, Empty
> + from datetime import datetime
> +
> +
> +@@ -124,14 +124,14 @@ class ProcessHandlerMixin(object):
> +             thread = threading.current_thread().name
> +             print("DBG::MOZPROC PID:{} ({}) | {}".format(self.pid, thread, msg))
> +
> +-        def __del__(self, _maxint=sys.maxint):
> ++        def __del__(self, _maxint=sys.maxsize):
> +             if isWin:
> +                 handle = getattr(self, '_handle', None)
> +                 if handle:
> +                     if hasattr(self, '_internal_poll'):
> +                         self._internal_poll(_deadstate=_maxint)
> +                     else:
> +-                        self.poll(_deadstate=sys.maxint)
> ++                        self.poll(_deadstate=sys.maxsize)
> +                 if handle or self._job or self._io_port:
> +                     self._cleanup()
> +             else:
> +@@ -243,7 +243,7 @@ class ProcessHandlerMixin(object):
> +                      p2cread, p2cwrite,
> +                      c2pread, c2pwrite,
> +                      errread, errwrite) = args_tuple
> +-                if not isinstance(args, basestring):
> ++                if not isinstance(args, str):
> +                     args = subprocess.list2cmdline(args)
> +
> +                 # Always or in the create new process group
> +diff --git a/third_party/python/which/which.py b/third_party/python/which/which.py
> +index 9c7d10835..f02b2616e 100644
> +--- a/third_party/python/which/which.py
> ++++ b/third_party/python/which/which.py
> +@@ -90,13 +90,13 @@ def _getRegisteredExecutable(exeName):
> +     if sys.platform.startswith('win'):
> +         if os.path.splitext(exeName)[1].lower() != '.exe':
> +             exeName += '.exe'
> +-        import _winreg
> ++        import winreg
> +         try:
> +             key = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths\\" +\
> +                   exeName
> +-            value = _winreg.QueryValue(_winreg.HKEY_LOCAL_MACHINE, key)
> ++            value = winreg.QueryValue(winreg.HKEY_LOCAL_MACHINE, key)
> +             registered = (value, "from HKLM\\"+key)
> +-        except _winreg.error:
> ++        except winreg.error:
> +             pass
> +         if registered and not os.path.exists(registered[0]):
> +             registered = None
> +@@ -244,7 +244,7 @@ def which(command, path=None, verbose=0, exts=None):
> +     If no match is found for the command, a WhichError is raised.
> +     """
> +     try:
> +-        match = whichgen(command, path, verbose, exts).next()
> ++        match = next(whichgen(command, path, verbose, exts))
> +     except StopIteration:
> +         raise WhichError("Could not find '%s' on the path." % command)
> +     return match
> +@@ -281,17 +281,17 @@ def main(argv):
> +     try:
> +         optlist, args = getopt.getopt(argv[1:], 'haVvqp:e:',
> +             ['help', 'all', 'version', 'verbose', 'quiet', 'path=', 'exts='])
> +-    except getopt.GetoptError, msg:
> ++    except getopt.GetoptError as msg:
> +         sys.stderr.write("which: error: %s. Your invocation was: %s\n"\
> +                          % (msg, argv))
> +         sys.stderr.write("Try 'which --help'.\n")
> +         return 1
> +     for opt, optarg in optlist:
> +         if opt in ('-h', '--help'):
> +-            print _cmdlnUsage
> ++            print(_cmdlnUsage)
> +             return 0
> +         elif opt in ('-V', '--version'):
> +-            print "which %s" % __version__
> ++            print("which %s" % __version__)
> +             return 0
> +         elif opt in ('-a', '--all'):
> +             all = 1
> +@@ -319,9 +319,9 @@ def main(argv):
> +         nmatches = 0
> +         for match in whichgen(arg, path=altpath, verbose=verbose, exts=exts):
> +             if verbose:
> +-                print "%s (%s)" % match
> ++                print("%s (%s)" % match)
> +             else:
> +-                print match
> ++                print(match)
> +             nmatches += 1
> +             if not all:
> +                 break
> +--
> +2.21.0
> +
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch b/meta-oe/recipes-extended/mozjs/mozjs/0002-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0002-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0010-fix-cross-compilation-on-i586-targets.patch b/meta-oe/recipes-extended/mozjs/mozjs/0003-fix-cross-compilation-on-i586-targets.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0010-fix-cross-compilation-on-i586-targets.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0003-fix-cross-compilation-on-i586-targets.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-do-not-create-python-environment.patch b/meta-oe/recipes-extended/mozjs/mozjs/0004-do-not-create-python-environment.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-do-not-create-python-environment.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0004-do-not-create-python-environment.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0002-fix-cannot-find-link.patch b/meta-oe/recipes-extended/mozjs/mozjs/0005-fix-cannot-find-link.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0002-fix-cannot-find-link.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0005-fix-cannot-find-link.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0003-workaround-autoconf-2.13-detection-failed.patch b/meta-oe/recipes-extended/mozjs/mozjs/0006-workaround-autoconf-2.13-detection-failed.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0003-workaround-autoconf-2.13-detection-failed.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0006-workaround-autoconf-2.13-detection-failed.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0005-fix-do_compile-failed-on-mips.patch b/meta-oe/recipes-extended/mozjs/mozjs/0007-fix-do_compile-failed-on-mips.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0005-fix-do_compile-failed-on-mips.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0007-fix-do_compile-failed-on-mips.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/add-riscv-support.patch b/meta-oe/recipes-extended/mozjs/mozjs/0008-add-riscv-support.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/add-riscv-support.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0008-add-riscv-support.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-mozjs-fix-coredump-caused-by-getenv.patch b/meta-oe/recipes-extended/mozjs/mozjs/0009-mozjs-fix-coredump-caused-by-getenv.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-mozjs-fix-coredump-caused-by-getenv.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0009-mozjs-fix-coredump-caused-by-getenv.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/format-overflow.patch b/meta-oe/recipes-extended/mozjs/mozjs/0010-format-overflow.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/format-overflow.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0010-format-overflow.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-To-fix-build-error-on-arm32BE.patch b/meta-oe/recipes-extended/mozjs/mozjs/0011-To-fix-build-error-on-arm32BE.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-To-fix-build-error-on-arm32BE.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0011-To-fix-build-error-on-arm32BE.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/JS_PUBLIC_API.patch b/meta-oe/recipes-extended/mozjs/mozjs/0012-JS_PUBLIC_API.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/JS_PUBLIC_API.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0012-JS_PUBLIC_API.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-riscv-Disable-atomic-operations.patch b/meta-oe/recipes-extended/mozjs/mozjs/0013-riscv-Disable-atomic-operations.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-riscv-Disable-atomic-operations.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0013-riscv-Disable-atomic-operations.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/fallback-to-2011-C++-standard.patch b/meta-oe/recipes-extended/mozjs/mozjs/0014-fallback-to-2011-C++-standard.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/fallback-to-2011-C++-standard.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/0014-fallback-to-2011-C++-standard.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-fix-compiling-failure-on-mips64-n32-bsp.patch b/meta-oe/recipes-extended/mozjs/mozjs/mipsarchn32/0001-fix-compiling-failure-on-mips64-n32-bsp.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-fix-compiling-failure-on-mips64-n32-bsp.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/mipsarchn32/0001-fix-compiling-failure-on-mips64-n32-bsp.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0006-support-musl.patch b/meta-oe/recipes-extended/mozjs/mozjs/musl/0001-support-musl.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0006-support-musl.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/musl/0001-support-musl.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs/0001-js-Fix-build-with-musl.patch b/meta-oe/recipes-extended/mozjs/mozjs/musl/0002-js-Fix-build-with-musl.patch
> similarity index 100%
> rename from meta-oe/recipes-extended/mozjs/mozjs/0001-js-Fix-build-with-musl.patch
> rename to meta-oe/recipes-extended/mozjs/mozjs/musl/0002-js-Fix-build-with-musl.patch
> diff --git a/meta-oe/recipes-extended/mozjs/mozjs_60.9.0.bb b/meta-oe/recipes-extended/mozjs/mozjs_60.9.0.bb
> index 4f2da492f..9466c62aa 100644
> --- a/meta-oe/recipes-extended/mozjs/mozjs_60.9.0.bb
> +++ b/meta-oe/recipes-extended/mozjs/mozjs_60.9.0.bb
> @@ -3,42 +3,45 @@ HOMEPAGE = "https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonk
>   LICENSE = "MPL-2.0"
>   LIC_FILES_CHKSUM = "file://LICENSE;md5=dc9b6ecd19a14a54a628edaaf23733bf"
>   
> -SRC_URI = "https://archive.mozilla.org/pub/firefox/releases/${PV}esr/source/firefox-${PV}esr.source.tar.xz \
> -           file://0001-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch \
> -           file://0010-fix-cross-compilation-on-i586-targets.patch \
> -           file://0001-do-not-create-python-environment.patch \
> -           file://0002-fix-cannot-find-link.patch \
> -           file://0003-workaround-autoconf-2.13-detection-failed.patch \
> -           file://0005-fix-do_compile-failed-on-mips.patch \
> -           file://add-riscv-support.patch \
> -           file://0001-mozjs-fix-coredump-caused-by-getenv.patch \
> -           file://format-overflow.patch \
> -           file://0001-To-fix-build-error-on-arm32BE.patch \
> -           file://JS_PUBLIC_API.patch \
> -           file://0001-riscv-Disable-atomic-operations.patch \
> -           file://fallback-to-2011-C++-standard.patch \
> -           "
> +SRC_URI = " \
> +    https://archive.mozilla.org/pub/firefox/releases/${PV}esr/source/firefox-${PV}esr.source.tar.xz \
> +    file://0001-Port-build-to-python3.patch \
> +    file://0002-js.pc.in-do-not-include-RequiredDefines.h-for-depend.patch \
> +    file://0003-fix-cross-compilation-on-i586-targets.patch \
> +    file://0004-do-not-create-python-environment.patch \
> +    file://0005-fix-cannot-find-link.patch \
> +    file://0006-workaround-autoconf-2.13-detection-failed.patch \
> +    file://0007-fix-do_compile-failed-on-mips.patch \
> +    file://0008-add-riscv-support.patch \
> +    file://0009-mozjs-fix-coredump-caused-by-getenv.patch \
> +    file://0010-format-overflow.patch \
> +    file://0011-To-fix-build-error-on-arm32BE.patch \
> +    file://0012-JS_PUBLIC_API.patch \
> +    file://0013-riscv-Disable-atomic-operations.patch \
> +    file://0014-fallback-to-2011-C++-standard.patch \
> +"
>   SRC_URI_append_libc-musl = " \
> -           file://0006-support-musl.patch \
> -           file://0001-js-Fix-build-with-musl.patch \
> -           "
> +    file://musl/0001-support-musl.patch \
> +    file://musl/0002-js-Fix-build-with-musl.patch \
> +"
>   SRC_URI_append_mipsarchn32 = " \
> -           file://0001-fix-compiling-failure-on-mips64-n32-bsp.patch \
> -           "
> +    file://mipsarchn32/0001-fix-compiling-failure-on-mips64-n32-bsp.patch \
> +"
>   SRC_URI[md5sum] = "69a0be9ce695e5dc4941ed0c78ef00c2"
>   SRC_URI[sha256sum] = "9f453c8cc5669e46e38f977764d49a36295bf0d023619d9aac782e6bb3e8c53f"
>   
>   S = "${WORKDIR}/firefox-${@d.getVar("PV").replace("esr", "")}"
>   
> -inherit autotools pkgconfig perlnative ${@bb.utils.contains("BBFILE_COLLECTIONS", "meta-python2", "pythonnative", "", d)}
> +inherit autotools pkgconfig perlnative python3native
>   
>   inherit features_check
>   CONFLICT_DISTRO_FEATURES_mipsarchn32 = "ld-is-gold"
>   
> -DEPENDS += "nspr zlib autoconf-2.13-native \
> -            python-six-native python-pytoml-native \
> -            python-jsmin-native python-futures-native \
> -            python-which-native"
> +DEPENDS += " \
> +    nspr zlib autoconf-2.13-native \
> +    python3-six-native python3-pytoml-native \
> +    python3-jsmin-native python3-six \
> +"
>   
>   # Disable null pointer optimization in gcc >= 6
>   # https://bugzilla.redhat.com/show_bug.cgi?id=1328045
> @@ -82,7 +85,7 @@ do_configure() {
>       export SHELL="/bin/sh"
>       cd ${S}
>       # Add mozjs python-modules necessary
> -    PYTHONPATH="$PYTHONPATH:${S}/config:${S}/build"
> +    PYTHONPATH="${S}/third_party/python/which:${S}/config:${S}/build"
>       for sub_dir in python testing/mozbase; do
>           for module_dir in `ls $sub_dir -1`;do
>               [ $module_dir = "virtualenv" ] && continue
> @@ -96,7 +99,6 @@ do_configure() {
>   
>       cd ${S}/js/src
>       autoconf213 --macrodir=${STAGING_DATADIR_NATIVE}/autoconf213 old-configure.in > old-configure
> -    sed -i 's:refresh = True:refresh = False:g' ${S}/build/moz.configure/old.configure
>   
>       cd ${B}
>       ${S}/js/src/configure ${EXTRA_OECONF}
> 



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