lang/python{27,32,33}: Fix missing shlib path in python-config

In Python 3.4+, upstream added and switched to using a shell
implementation of the python-config script [1]. The Python
implementation  (python-config.py) remained used by all versions < 3.4.

While the shell implementation returns the path to the Python
shared library when using the --ldflags script argument, the Python
implementation of the script does not. The bug has been reported, but
has not yet been merged [2].

The Python ports currently default to including ${LOCALBASE}/lib
in LIBS when the NLS option is enabled (which it is by default).

When built *with* NLS (gettext) support, the flags added to LIBS
are returned in `pythonX.Y-config --ldflags` output, which happens
to match the path to the Python shared library.

If the NLS option is disabled, ${LOCALBASE}/lib is not added to LIBS,
and are therefore not returned in --ldflags output.

This results in potential linking errors for software that uses
python-config to obtain the correct library path, when the NLS option is
disabled:

$ make WITH=PYTHON -C audio/alsa-lib
[...]
--- smixer-python.la ---
CCLD     smixer-python.la
/usr/bin/ld: cannot find -lpython2.7

This change modifies the python-config.in script to match the shell
implementation, outputting the library path in --ldflags output.

While I'm here:

for Python 3.2 and Python 3.3 ports, backport a library order
change [3]. This could affect linking with static libraries.

Use standard length lines and reduce diffs in pkg-message

[1] https://bugs.python.org/issue16235
[2] https://bugs.python.org/issue7352
[2] https://bugs.python.org/issue18096

PR:		197757
Submitted by:	jbeich
MFH:		2015Q4

1 files changed, 32 insertions, 0 deletions

diff --git a/lang/python32/files/patch-Misc_python-config.in b/lang/python32/files/patch-Misc_python-config.in
new file mode 100644
index 000000000000..c71439d4df66
--- /dev/null
+++ b/lang/python32/files/patch-Misc_python-config.in
@@ -0,0 +1,32 @@
+# pythonx.y-config --ldflags out of /usr and missing -L<install_lib_dir>
+# https://bugs.python.org/issue7352
+
+# Fix library order returned by python-config. [#18096]
+# bugs.python.org/18096
+
+--- Misc/python-config.in.orig	2013-05-15 16:33:52 UTC
++++ Misc/python-config.in
+@@ -22,6 +22,7 @@ except getopt.error:
+ if not opts:
+     exit_with_usage()
+ 
++libdir = sysconfig.get_config_var('exec_prefix') + '/lib'
+ pyver = sysconfig.get_config_var('VERSION')
+ getvar = sysconfig.get_config_var
+ 
+@@ -45,11 +46,13 @@ for opt in opt_flags:
+         print(' '.join(flags))
+ 
+     elif opt in ('--libs', '--ldflags'):
+-        libs = getvar('LIBS').split() + getvar('SYSLIBS').split()
+-        libs.append('-lpython' + pyver + sys.abiflags)
++        libs = ['-lpython' + pyver + sys.abiflags]
++        libs += getvar('LIBS').split()
++        libs += getvar('SYSLIBS').split()
+         # add the prefix/lib/pythonX.Y/config dir, but only if there is no
+         # shared library in prefix/lib/.
+         if opt == '--ldflags':
++            libs.insert(0, '-L' + libdir)
+             if not getvar('Py_ENABLE_SHARED'):
+                 libs.insert(0, '-L' + getvar('LIBPL'))
+             if not getvar('PYTHONFRAMEWORK'):