[oe] [meta-oe][PATCH] libmxml: Use autotools bbclass and cleanup the recipe a bit.

[Piotr Tworek]

The package does use autotools based build systemd but it comes with a
bit of a twist. It explicitly disallows running autoheader on the source
tree. Unfortunately this is what autoreconf invoked by autotools bbclass
does. Still, there is an easy fix for this. When AUTOHEADER env variable
is defined this is what autoreconf will invoke instead of autoheader
binary found in PATH. If we set it to /bin/true we'll esentially satisfy
mxml requirements without having to patch autotools bbclass.

This patch also adds PACKAGECONFIG option allowing the user to toggle
threading support in the library. Not sure how useful it is, but upstream
does offer such option, it works, and its not a lot of work to expose it
via PACKAGECONFIG.

Another improvement is related to package optimization handling.
mxml has a nasty habit of disregarding optimization flags passed by the
user. It always appends -Os -g to CFLAGS in its configure script. Its
a bit suprising to find out DEBUG_BUILD=1 in local.conf has no impact on
libraries produced by mxml recipe. This can be fixed with a simple sed
script.

Sed is also used to enable verbose compilation output. Having full
compiler invocations visible in the logs is generally useful, but
more importantly it allows some of the QA checks to their work.

While doing this cleanup I've also renamed the recipe from libxml_git.bb
to libxml_3.0.bb. The git keyword suggests this recipe is for some
random git snapshot, while in reality its for latest stable upstream
release of the package. Fortunately for us upstream also tags releases
in git so we can use those tags to fetch correct version of the sources.

Last but not least this patch removes the bin package. Current versions of
mxml no longer provide any tools. The package was empty.

Signed-off-by: Piotr Tworek <tworaz at tworaz.net>
---
 .../recipes-support/libmxml/libmxml_3.0.bb    | 35 +++++++++++++++
 .../recipes-support/libmxml/libmxml_git.bb    | 44 -------------------
 2 files changed, 35 insertions(+), 44 deletions(-)
 create mode 100644 meta-oe/recipes-support/libmxml/libmxml_3.0.bb
 delete mode 100644 meta-oe/recipes-support/libmxml/libmxml_git.bb

diff --git a/meta-oe/recipes-support/libmxml/libmxml_3.0.bb b/meta-oe/recipes-support/libmxml/libmxml_3.0.bb
new file mode 100644
index 000000000..cc83e19c9
--- /dev/null
+++ b/meta-oe/recipes-support/libmxml/libmxml_3.0.bb
@@ -0,0 +1,35 @@
+DESCRIPTION = "Tiny XML Library"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=86d3f3a95c324c9479bd8986968f4327"
+HOMEPAGE = "https://www.msweet.org/mxml/"
+BUGTRACKER = "https://github.com/michaelrsweet/mxml/issues"
+
+SRC_URI = "git://github.com/michaelrsweet/mxml.git"
+SRCREV = "v${PV}"
+S = "${WORKDIR}/git"
+
+inherit autotools
+
+PACKAGECONFIG ??= "threads"
+PACKAGECONFIG[threads] = "--enable-threads,--disable-threads"
+
+# Package does not support out of tree builds.
+B = "${S}"
+
+do_configure_prepend() {
+    # Respect optimization CFLAGS specified by OE.
+    sed -e 's/-Os -g//' -i ${S}/configure.ac
+
+    # Enable verbose compilation output. This is required for extra QA checks to work.
+    sed -e '/.SILENT:/d' -i ${S}/Makefile.in
+
+    # The package uses autotools but it explicitly states it does not
+    # support running autoheader. The following export should make sure
+    # autoreconf used by autotools.bbclass invokes /bin/true instead
+    export AUTOHEADER=$(which true)
+}
+
+do_install() {
+    # Package uses DSTROOT instread of standard DESTDIR to specify install location.
+    oe_runmake install DSTROOT=${D}
+}
diff --git a/meta-oe/recipes-support/libmxml/libmxml_git.bb b/meta-oe/recipes-support/libmxml/libmxml_git.bb
deleted file mode 100644
index b17fc67e0..000000000
--- a/meta-oe/recipes-support/libmxml/libmxml_git.bb
+++ /dev/null
@@ -1,44 +0,0 @@
-DESCRIPTION = "Tiny XML Library"
-LICENSE = "Apache-2.0"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=86d3f3a95c324c9479bd8986968f4327"
-HOMEPAGE = "https://www.msweet.org/mxml/"
-BUGTRACKER = "https://github.com/michaelrsweet/mxml/issues"
-
-SRC_URI = "git://github.com/michaelrsweet/mxml.git"
-SRCREV = "c7755b6992a2afdd34dde47fc9be97f1237cfded"
-S = "${WORKDIR}/git"
-# v3.0
-PV = "3.0"
-
-CONFIGUREOPTS = " --prefix=${prefix} \
-                  --bindir=${bindir} \
-                  --sbindir=${sbindir} \
-                  --libexecdir=${libexecdir} \
-                  --datadir=${datadir} \
-                  --sysconfdir=${sysconfdir} \
-                  --sharedstatedir=${sharedstatedir} \
-                  --localstatedir=${localstatedir} \
-                  --libdir=${libdir} \
-                  --includedir=${includedir} \
-                  --oldincludedir=${oldincludedir} \
-                  --infodir=${infodir} \
-                  --mandir=${mandir} \
-                  --host=${TARGET_SYS} \
-                  --build=${BUILD_SYS} \
-                  ${PACKAGECONFIG_CONFARGS} \
-                "
-
-do_configure() {
-    install -m 0755 ${STAGING_DATADIR_NATIVE}/gnu-config/config.guess ${S}
-    install -m 0755 ${STAGING_DATADIR_NATIVE}/gnu-config/config.sub ${S}
-    ./configure ${CONFIGUREOPTS} --enable-shared
-}
-
-do_install () {
-    export DSTROOT=${D}
-    oe_runmake install
-}
-
-PACKAGES += " ${PN}-bin "
-FILES_${PN} = "${libdir}/*"
-FILES_${PN}-bin = "${bindir}/*"
-- 
2.21.0