embedded python on mac - linking problem

Krzysztof Kobus kk720801 at yahoo.com
Wed Jan 6 12:59:50 CET 2010


Hi,

 
> > Well, it seems that one of your files is a different architecture than
> > the others. Based on the location, I'd say it's i386 while the rest of
> > it would be PowerPC. You can cross-compile but you can't link an i386
> > library to a PowerPC library.

Thank you for the hint. I have checked with "file" command the format of the 
libraries on mac and got following result:

one of my application's libraries:
libkkbase.dylib: Mach-O dynamically linked shared library i386

my python module that has been built using standard python distutils:
j3k.so: Mach-O bundle i386

I am not actually sure what's the difference between "bundle" and "dynamically 
linked shared library" on mac and if they can be linked together? Perhaps I 
should configure distutils on mac somehow specially to make the module ready for 
embedding?

Thanks,

KK


> On Tue, Jan 5, 2010 at 7:33 AM, Krzysztof Kobus wrote:
> > Hi,
> >
> >
> I have a problem with linking python module with my application on mac
> in order to make the module available in "embedded python".
> >
> > My python module is contained in  j3kmodule.cxx file and module initialization 
> function is exported in j3kmodule.h
> >
> > j3kmodule.h:
> > ------------
> > PyMODINIT_FUNC PyInit_j3k(void);
> >
> >
> > j3kmodule.cxx:
> > --------------
> > PyMODINIT_FUNC
> > PyInit_j3k(void)
> >  {
> >  PyObject *m = NULL;
> >
> >  if ((m = PyModule_Create(&j3k_module)) == NULL)
> >    return NULL;
> >
> >  return m;
> >  }
> >
> >
> > Then in my application in KkPython.cxx file I have:
> >
> > KkPython.cxx:
> > -------------
> >
> > #include "j3kmodule.h"
> >
> > /* Add a builtin module, before Py_Initialize */
> > PyImport_AppendInittab("j3k", PyInit_j3k);
> >
> >
> >
> I link my application with the module and get following linking error
> on mac although on open suse linux exactly the same procedure works
> fine:
> >
> > g++ -headerpad_max_install_names -o
> ../../bin/render.app/Contents/MacOS/render main.o KkPython.o -lkkbase
> -L/Users/kk/dev/J3K/trunk/j3ksrc/examples/render/../../lib/
> -lQtSolutions_PropertyBrowser-2.5 -lpython3.1
> /Users/kk/dev/J3K/trunk/j3ksrc/python/modules/build/lib.macosx-10.3-i386-3.1/j3k.so
> -framework OpenGL -framework AGL
> > ld: warning in
> /Users/kk/dev/J3K/trunk/j3ksrc/python/modules/build/lib.macosx-10.3-i386-3.1/j3k.so,
> file is not of required architecture
> > Undefined symbols:
> >  "_PyInit_j3k", referenced from:
> >      _PyInit_j3k$non_lazy_ptr in KkPython.o
> > ld: symbol(s) not found
> > collect2: ld returned 1 exit status
> > make: *** [../../bin/render.app/Contents/MacOS/render] Error 1
> >
> >
> > I appreciate any hints,
> >
> > best greetings,
> >
> > Krzysztof Kobus
> >



      



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