PL/Python: Make build on OS X more flexible

The PL/Python build on OS X was previously hardcoded to use the system
installation of Python, ignoring whatever was specified to configure.
Except that it would use the header files from configure, which could
lead to mismatches.  It was not possible to build against a custom
Python installation.

Now, we check in configure how the specified Python installation was
built and use that, supporting framework and non-framework builds.

Author: petere

config/python.m4

@@ -48,7 +48,6 @@ AC_MSG_RESULT([$python_includespec])
 
 AC_SUBST(python_majorversion)[]dnl
 AC_SUBST(python_version)[]dnl
-AC_SUBST(python_configdir)[]dnl
 AC_SUBST(python_includespec)[]dnl
 ])# _PGAC_CHECK_PYTHON_DIRS
 
@@ -69,8 +68,14 @@ python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(N
 python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
 python_so=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('SO'))))"`
 ldlibrary=`echo "${python_ldlibrary}" | sed "s/${python_so}$//"`
+python_framework=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('PYTHONFRAMEWORK'))))"`
+python_enable_shared=`${PYTHON} -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars().get('Py_ENABLE_SHARED',0))"`
 
-if test x"${python_libdir}" != x"" -a x"${python_ldlibrary}" != x"" -a x"${python_ldlibrary}" != x"${ldlibrary}"
+if test -n "$python_framework"; then
+	python_frameworkprefix=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('PYTHONFRAMEWORKPREFIX'))))"`
+	python_libspec="-F $python_frameworkprefix -framework $python_framework"
+	python_enable_shared=1
+elif test x"${python_libdir}" != x"" -a x"${python_ldlibrary}" != x"" -a x"${python_ldlibrary}" != x"${ldlibrary}"
 then
 	# New way: use the official shared library
 	ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"`
@@ -86,13 +91,16 @@ else
 	python_libspec="-L${python_libdir} -lpython${python_ldversion}"
 fi
 
-python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+if test -z "$python_framework"; then
+	python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+fi
 
 AC_MSG_RESULT([${python_libspec} ${python_additional_libs}])
 
 AC_SUBST(python_libdir)[]dnl
 AC_SUBST(python_libspec)[]dnl
 AC_SUBST(python_additional_libs)[]dnl
+AC_SUBST(python_enable_shared)[]dnl
 
 # threaded python is not supported on OpenBSD
 AC_MSG_CHECKING(whether Python is compiled with thread support)

configure

@@ -672,11 +672,11 @@ HAVE_IPV6
 LIBOBJS
 OSSP_UUID_LIBS
 ZIC
+python_enable_shared
 python_additional_libs
 python_libspec
 python_libdir
 python_includespec
-python_configdir
 python_version
 python_majorversion
 PYTHON
@@ -7446,8 +7446,14 @@ python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(N
 python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
 python_so=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('SO'))))"`
 ldlibrary=`echo "${python_ldlibrary}" | sed "s/${python_so}$//"`
-
-if test x"${python_libdir}" != x"" -a x"${python_ldlibrary}" != x"" -a x"${python_ldlibrary}" != x"${ldlibrary}"
+python_framework=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('PYTHONFRAMEWORK'))))"`
+python_enable_shared=`${PYTHON} -c "import distutils.sysconfig; print(distutils.sysconfig.get_config_vars().get('Py_ENABLE_SHARED',0))"`
+
+if test -n "$python_framework"; then
+	python_frameworkprefix=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('PYTHONFRAMEWORKPREFIX'))))"`
+	python_libspec="-F $python_frameworkprefix -framework $python_framework"
+	python_enable_shared=1
+elif test x"${python_libdir}" != x"" -a x"${python_ldlibrary}" != x"" -a x"${python_ldlibrary}" != x"${ldlibrary}"
 then
 	# New way: use the official shared library
 	ldlibrary=`echo "${ldlibrary}" | sed "s/^lib//"`
@@ -7463,7 +7469,9 @@ else
 	python_libspec="-L${python_libdir} -lpython${python_ldversion}"
 fi
 
-python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+if test -z "$python_framework"; then
+	python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+fi
 
 { $as_echo "$as_me:$LINENO: result: ${python_libspec} ${python_additional_libs}" >&5
 $as_echo "${python_libspec} ${python_additional_libs}" >&6; }

src/Makefile.global.in

@@ -175,11 +175,11 @@ enable_dtrace	= @enable_dtrace@
 enable_coverage	= @enable_coverage@
 enable_thread_safety	= @enable_thread_safety@
 
+python_enable_shared	= @python_enable_shared@
 python_includespec	= @python_includespec@
 python_libdir		= @python_libdir@
 python_libspec		= @python_libspec@
 python_additional_libs	= @python_additional_libs@
-python_configdir	= @python_configdir@
 python_majorversion	= @python_majorversion@
 python_version		= @python_version@
 

src/pl/plpython/Makefile

@@ -5,13 +5,20 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 
-# On some platforms we can only build PL/Python if libpython is a
-# shared library.  Since there is no official way to determine this
-# (at least not in pre-2.3 Python), we see if there is a file that is
-# named like a shared library.
+# We need libpython as a shared library.  In Python >=2.5, configure
+# asks Python directly.  But because this has been broken in Debian
+# for a long time (http://bugs.debian.org/695979), and to support
+# older Python versions, we see if there is a file that is named like
+# a shared library as a fallback.  (Note that this is wrong on OS X,
+# where DLSUFFIX is .so, but libpython is a .dylib.  Python <2.5 is
+# therefore not supported on OS X.)
+ifeq (1,$(python_enable_shared))
+shared_libpython = yes
+else
 ifneq (,$(wildcard $(python_libdir)/libpython*$(DLSUFFIX)*))
 shared_libpython = yes
 endif
+endif
 
 # Windows needs to convert backslashed paths to normal slashes,
 # and we have to remove -lpython from the link since we are building our own
@@ -21,13 +28,6 @@ python_includespec := $(subst \,/,$(python_includespec))
 override python_libspec =
 endif
 
-# Darwin (OS X) has its own ideas about how to do this.
-ifeq ($(PORTNAME), darwin)
-shared_libpython = yes
-override python_libspec = -framework Python
-override python_additional_libs =
-endif
-
 # If we don't have a shared library, we have to skip it.
 ifeq ($(shared_libpython),yes)