embedded python on mac - linking problem

[Krzysztof Kobus]

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

 

[Diez B. Roggisch]

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,

The missing symbol looks like a C++-symbol - but Python is C. Do you
maybe miss the

extern "C"

declaration.

Diez