Re: SWIG runtime libs/Python distutils combo on Mac

I'm pretty sure I cannot compile swigrun_wrap into every extension or 
make it a static library, since each extension will get its own copy 
and that will defeat the purpose of the runtime libraries.  Sounds like 
I need to create a dylib, that python distutils can't help me, and that 
I'll have to learn libtool if I want to make it portable.  Does that 
sound about right?

On Sep 27, 2004, at 10:19 AM, Bob Ippolito wrote:

> On Sep 27, 2004, at 12:03 PM, Bill Spotz wrote:
>
> > To get around the portability problem, I have decided to use python's 
> > distutils module to handle the compilation issues.  In my setup.py 
> > script, I define
> >
> >   SwigRun = Extension("PyTrilinos.libswigrun", ["src/swigrun_wrap.c"])
> >
> > and this works, as build/lib.blahblahblah/PyTrilinos/libswigrun.so 
> > gets created properly.  When I define real extensions in setup.py, 
> > they are created with keyword arguments
> >
> >     library_dirs    = [..., "build/lib.blahblahblah/PyTrilinos", ...],
> >     libraries       = [..., "swigrun", ...],
> >
> > which gives me the link command arguments I want: 
> > -Lbuild/lib.blahblahblah/PyTrilinons -lswigrun.  However, on my Mac, 
> > when the link command is invoked, I get
> >
> >     ld: can't locate file for: -lswigrun
> >
> > I strongly suspect that the Mac's ld command does not search for 
> > libswigrun.so when -lswigrun is given as a command line argument (the 
> > old system libraries have .la and .dylib extensions).  But I cannot 
> > figure out how to get setup.py to compile to a different suffix.
>
> You can't do this on OS X.  You can link to two types of files in OS 
> X, static libraries and dylibs.  Python extension modules are bundles 
> (runtime loadable code) and can not be linked to at compile time.  You 
> should either compile swigrun_wrap into every extension, or make it a 
> static library (which is more or less the same thing).
>
> -bob

** Bill Spotz                                              **
** Sandia National Laboratories  Voice: (505)845-0170      **
** P.O. Box 5800                 Fax:   (505)284-5451      **
** Albuquerque, NM 87185-0316    Email: wfspotz@xxxxxxxxxx **


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