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@cardoe.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

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])
 CPPFLAGS=$ac_previous_cppflags
 LDFLAGS=$ac_previous_ldflags
 ])

tools/configure

@@ -7285,9 +7285,9 @@ if test x"$pyconfig" = x"no"; then :
         print "-I" + distutils.sysconfig.get_config_var("INCLUDEPY")'`"
     CPPFLAGS="$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,\
@@ -7301,6 +7301,7 @@ else
 
         CPPFLAGS="$CFLAGS `$PYTHON-config --cflags`"
     LDFLAGS="$LDFLAGS `$PYTHON-config --ldflags`"
+    PYTHON_LIBS="$LIBS `$PYTHON-config --libs`"
 
 fi
 
@@ -7319,7 +7320,7 @@ if eval \${$as_ac_Lib+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
-LIBS="-lpython$ac_python_version  $LIBS"
+LIBS="-lpython$ac_python_version $PYTHON_LIBS $LIBS"
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */