[OE-core] [PATCH] python3: python3: Fix build error x86->x86

[Ricardo Ribalda Delgado]

When building x86->x86 the system will try to execute .so and related items
from the default PYTHONPATH.  This will fail if the target CPU contains
instructions that the host CPU does not have, add CROSSPYTHONPATH
into PYTHONPATH so we can prepend the list to find correct libs.

Fixes:

Illegal instruction (core dumped)
Makefile:625: recipe for target 'sharedmods' failed
make: *** [sharedmods] Error 132
make: *** Waiting for unfinished jobs....

Signed-off-by: Ricardo Ribalda Delgado <ricardo at ribalda.com>
---
 .../python/python3/crosspythonpath.patch      | 25 +++++++++++++++++++
 meta/recipes-devtools/python/python3_3.7.3.bb |  2 ++
 2 files changed, 27 insertions(+)
 create mode 100644 meta/recipes-devtools/python/python3/crosspythonpath.patch

diff --git a/meta/recipes-devtools/python/python3/crosspythonpath.patch b/meta/recipes-devtools/python/python3/crosspythonpath.patch
new file mode 100644
index 0000000000..d789ab57d4
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/crosspythonpath.patch
@@ -0,0 +1,25 @@
+configure.ac: add CROSSPYTHONPATH into PYTHONPATH for PYTHON_FOR_BUILD
+
+When building x86->x86 the system will try to execute .so and related items
+from the default PYTHONPATH.  This will fail if the target CPU contains
+instructions that the host CPU does not have, add CROSSPYTHONPATH
+into PYTHONPATH so we can prepend the list to find correct libs.
+
+Upstream-Status: Inappropriate [OE-Core integration specific]
+
+Credits-to: Mark Hatle <mark.hatle at windriver.com>
+Credits-to: Jackie Huang <jackie.huang at windriver.com>
+Signed-off-by: Ricardo Ribalda <ricardo at ribalda.com>
+diff --git a/configure.ac b/configure.ac
+index 4ab19a6..7036a53 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -76,7 +76,7 @@ if test "$cross_compiling" = yes; then
+ 	    AC_MSG_ERROR([python$PACKAGE_VERSION interpreter not found])
+ 	fi
+         AC_MSG_RESULT($interp)
+-	PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(abs_builddir) _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(shell test -f pybuilddir.txt && echo $(abs_builddir)/`cat pybuilddir.txt`:)$(srcdir)/Lib _PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH) '$interp
++	PYTHON_FOR_BUILD='_PYTHON_PROJECT_BASE=$(abs_builddir) _PYTHON_HOST_PLATFORM=$(_PYTHON_HOST_PLATFORM) PYTHONPATH=$(CROSSPYTHONPATH):$(shell test -f pybuilddir.txt && echo $(abs_builddir)/`cat pybuilddir.txt`:)$(srcdir)/Lib _PYTHON_SYSCONFIGDATA_NAME=_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH) '$interp
+     fi
+ elif test "$cross_compiling" = maybe; then
+     AC_MSG_ERROR([Cross compiling required --host=HOST-TUPLE and --build=ARCH])
diff --git a/meta/recipes-devtools/python/python3_3.7.3.bb b/meta/recipes-devtools/python/python3_3.7.3.bb
index 832ef1b3c3..2444296142 100644
--- a/meta/recipes-devtools/python/python3_3.7.3.bb
+++ b/meta/recipes-devtools/python/python3_3.7.3.bb
@@ -24,6 +24,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
            file://0001-Lib-sysconfig.py-fix-another-place-where-lib-is-hard.patch \
            file://0001-Makefile-fix-Issue36464-parallel-build-race-problem.patch \
 	   file://0001-bpo-36852-proper-detection-of-mips-architecture-for-.patch \
+	   file://crosspythonpath.patch \
            "
 
 SRC_URI_append_class-native = " \
@@ -65,6 +66,7 @@ DEPENDS_append_class-nativesdk = " python3-native"
 EXTRA_OECONF = " --without-ensurepip --enable-shared"
 EXTRA_OECONF_append_class-native = " --bindir=${bindir}/${PN}"
 
+export CROSSPYTHONPATH="${STAGING_LIBDIR_NATIVE}/python${PYTHON_MAJMIN}/lib-dynload/"
 
 EXTRANATIVEPATH += "python3-native"
 
-- 
2.20.1