Improve detection of Python 3.2 installations

Because of ABI tagging, the library version number might no longer be
exactly the Python version number, so do extra lookups.  This affects
installations without a shared library, such as ActiveState's
installer.

Also update the way to detect the location of the 'config' directory,
which can also be versioned.

Ashesh Vashi

config/python.m4

@@ -32,7 +32,7 @@ fi
 AC_MSG_CHECKING([Python configuration directory])
 python_majorversion=`${PYTHON} -c "import sys; print(sys.version[[0]])"`
 python_version=`${PYTHON} -c "import sys; print(sys.version[[:3]])"`
-python_configdir=`${PYTHON} -c "from distutils.sysconfig import get_python_lib as f; import os; print(os.path.join(f(plat_specific=1,standard_lib=1),'config'))"`
+python_configdir=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
 python_includespec=`${PYTHON} -c "import distutils.sysconfig; print('-I'+distutils.sysconfig.get_python_inc())"`
 
 AC_SUBST(python_majorversion)[]dnl
@@ -69,7 +69,12 @@ then
 else
 	# Old way: use libpython from python_configdir
 	python_libdir="${python_configdir}"
-	python_libspec="-L${python_libdir} -lpython${python_version}"
+	# LDVERSION was introduced in Python 3.2.
+	python_ldversion=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
+	if test x"${python_ldversion}" = x""; then
+		python_ldversion=$python_version
+	fi
+	python_libspec="-L${python_libdir} -lpython${python_ldversion}"
 fi
 
 python_additional_libs=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`

configure

@@ -7242,7 +7242,7 @@ fi
 $as_echo_n "checking Python configuration directory... " >&6; }
 python_majorversion=`${PYTHON} -c "import sys; print(sys.version[0])"`
 python_version=`${PYTHON} -c "import sys; print(sys.version[:3])"`
-python_configdir=`${PYTHON} -c "from distutils.sysconfig import get_python_lib as f; import os; print(os.path.join(f(plat_specific=1,standard_lib=1),'config'))"`
+python_configdir=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
 python_includespec=`${PYTHON} -c "import distutils.sysconfig; print('-I'+distutils.sysconfig.get_python_inc())"`
 
 # This should be enough of a message.
@@ -7266,7 +7266,12 @@ then
 else
 	# Old way: use libpython from python_configdir
 	python_libdir="${python_configdir}"
-	python_libspec="-L${python_libdir} -lpython${python_version}"
+	# LDVERSION was introduced in Python 3.2.
+	python_ldversion=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
+	if test x"${python_ldversion}" = x""; then
+		python_ldversion=$python_version
+	fi
+	python_libspec="-L${python_libdir} -lpython${python_ldversion}"
 fi
 
 python_additional_libs=`${PYTHON} -c "import distutils.sysconfig,string; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`