Undefined symbol when importing a cython module making use of another cython module

Question

I\'m working on wrapping a set of C functions using Cython into a module. I would like to be able to cimport this first module into subsequent Cython-based projects, but I a

Answer 1

I was able to get this to work by doing the following:

First, specify the exModA library for linking in your exModB/setup.py file as follows:

from distutils.core import setup, Extension
from Cython.Build import cythonize

ext = Extension('exModB/exModB',
                sources=['exModB/exModB.pyx'],
                libraries=['exModA'],
                library_dirs=['/home/MyFolder/exModA'],
                runtime_library_dirs=['/home/MyFolder/exModA']
                )
setup(name='exModB', ext_modules = cythonize(ext))

(Instead of specifying a runtime library directory, I recommend moving exModA.so to a folder on your library search path.)

I also had to rename exModA.so to libexModA.so so that gcc could find it. Do this after building exModA.so, but before building exModB.so:

python exModA/setup.py build_ext --inplace
cp exModA/exModA.so exModA/libexModA.so
python exModB/setup.py build_ext --inplace

You will probably want to tweak this, but it should get you started.