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[Xen-devel] [PATCH v2 3/4] m4/python: fix checks for Python library support

AC_CHECK_LIB() was running gcc -Llib -lm -lutils conftest.c which on
platforms that do as needed operations by default will result in
underlinking. Instead AC_CHECK_LIB() suggests supplying the extra
libraries necessary in a 5th argument.

Signed-off-by: Doug Goldstein <cardoe@xxxxxxxxxx>
CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
CC: Ian Campbell <ian.campbell@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>

change since v1:
- don't screw up the white space
 m4/python_devel.m4 | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/m4/python_devel.m4 b/m4/python_devel.m4
index deff19e..05ea4ef 100644
--- a/m4/python_devel.m4
+++ b/m4/python_devel.m4
@@ -10,9 +10,9 @@ AS_IF([test x"$pyconfig" = x"no"], [
         print "-I" + distutils.sysconfig.get_config_var("INCLUDEPY")'`"
     CPPFLAGS="$CPPFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print distutils.sysconfig.get_config_var("CFLAGS")'`"
-    LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
+    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print distutils.sysconfig.get_config_var("LIBS")'`"
-    LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
+    PYTHON_LIBS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print distutils.sysconfig.get_config_var("SYSLIBS")'`"
     LDFLAGS="$LDFLAGS `$PYTHON -c 'import distutils.sysconfig; \
         print "-L" + distutils.sysconfig.get_python_lib(plat_specific=1,\
@@ -25,12 +25,14 @@ AS_IF([test x"$pyconfig" = x"no"], [
     dnl If python-config is found use it
     CPPFLAGS="$CFLAGS `$PYTHON-config --cflags`"
     LDFLAGS="$LDFLAGS `$PYTHON-config --ldflags`"
+    PYTHON_LIBS="$LIBS `$PYTHON-config --libs`"
 AC_CHECK_HEADER([Python.h], [],
     [AC_MSG_ERROR([Unable to find Python development headers])],)
 AC_CHECK_LIB(python$ac_python_version, PyArg_ParseTuple, [],
-    [AC_MSG_ERROR([Unable to find a suitable python development library])])
+    [AC_MSG_ERROR([Unable to find a suitable python development library])],
+    [$PYTHON_LIBS])

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