Re: SWIG runtime libs/Python distutils combo on Mac

On Sep 29, 2004, at 4:43 PM, Bill Spotz wrote:

> 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).
> 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?

I don't think your assessment of swigrun_wrap is correct.

-bob
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