[Distutils] Building extension on FreeBSD with Py_ENABLE_SHARED

[Floris Bruynooghe]

Hi Nicholas

On Thu, Jan 07, 2010 at 10:19:12PM -0500, Nicholas Bastin wrote:
> (This comes from trying to build python with --enable-shared, but I
> think the problem is not in the Python build process, but rather in
> distutils itself)
> 
> When building python standard extensions as part of the build process
> from ./configure --enable-shared in 2.7 trunk on freebsd5, all the
> modules fail because they can't find libpython2.7.so:

Searching throug the tracker I found this:
http://bugs.python.org/issue4366, which looks the same issue.


> This is because libpython2.7.so is in '.' (pre-install), and -L. isn't
> on the compile command.  This problem doesn't happen on linux or
> solaris, but it turns out that's because it's special-cased in
> distutils.command.build_ext.finalize_options:278:
> 
>         # for extensions under Linux or Solaris with a shared Python library,
>         # Python's library directory must be appended to library_dirs
>         sysconfig.get_config_var('Py_ENABLE_SHARED')
>         if ((sys.platform.startswith('linux') or sys.platform.startswith('gnu')
>              or sys.platform.startswith('sunos'))
>             and sysconfig.get_config_var('Py_ENABLE_SHARED')):
>             if sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")):
>                 # building third party extensions
>                 self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
>             else:
>                 # building python standard extensions
>                 self.library_dirs.append('.')
> 
> Adding freebsd to the list of platforms in question solves my
> particular problem, although I don't know enough about distutils to
> know if this would cause some other problem.  Is there any particular
> reason we should not add '.' to the list of library_dirs on freebsd?

Your solution is better tough, If you don't I'll try to create and
test a patch for it by the end of the weekend.

Regards
Floris

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