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Date: Mon, 12 Mar 2007 14:40:15 +0100
From: Samuel Thibault <samuel DOT thibault AT ens-lyon DOT org>
To: cygwin AT cygwin DOT com
Subject: Re: python & development
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Hi,

Jason Tishler, le Mon 12 Mar 2007 08:19:32 -0500, a écrit :
> On Mon, Mar 12, 2007 at 01:54:46AM +0100, Samuel Thibault wrote:
> > I'd need to use pyrexc for building python bindings, is there any
> > plans for including it in the cygwin distribution?  (the upstream tgz
> > currently installs just fine).
> 
> Would you like to contribute this package?

Why not, but maybe it's easier to have the same person manage related
packages?

> > And about python, there's something odd with libpython2.4.dll.a: it is
> > located in /usr/lib/python2.4/config/,
> 
> When I added shared extension support to Cygwin Python, I put
> libpython2.4.dll.a in /usr/lib/python2.4/config because that was the
> same directory that contains libpython2.4.a (and the other files needed
> for extending/embedding) on Unix.
> 
> > unlike Linux where it is located in /usr/lib/python2.4/
> 
> Which file are you referring to on Linux?  libpython2.4.so?  If so, it
> is located in /usr/lib.

Uh, indeed, and in /usr/lib/python2.4/config/ too, but _not_ in
/usr/lib/python2.4.  I wonder how it is that I thought it was in
/usr/lib/python2.4.  But at least I understand why it was working for me
in Linux, and -L/usr/lib/python2.4 wasn't needed at all actually.

> > That poses problem with linking with it.  The ac_python_devel.m4 file
> > shipped with autotools uses get_python_lib(0,1) from the
> > distutils.sysconfig package for determining which path to give to
> > gcc's -L so that gcc's -lpython2.4 can work, and that returns
> > /usr/lib/python2.4 (just like in Linux).

So maybe the ac_python_devel.m4 file is just buggy actually:

		PYTHON_LDFLAGS=`$PYTHON -c "from distutils.sysconfig import *; \
			from string import join; \
			print '-L' + get_python_lib(0,1), \
		      	'-lpython';"`$py_version

Maybe it should append config/ to get_python_lib(0,1) ?

> AFAICT, Distutils sets gcc's -L correctly under Cygwin.

Mmm, how?  This didn't work for me.

> > Could this somehow be fixed?
> 
> But, where should this be fixed?  Cygwin Python's shared extension
> support hasn't changed in a long time.  I'm afraid I'll break someone's
> build, if I move libpython2.4.dll.a to another directory.

Maybe not moving it, but doing like in Linux: providing it in /usr/lib
too?

Samuel

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