Sunday, October 28, 2012

pythonxy cython mingw problems

Again I was having issues using a cython compiled package with pythonxy. For some reason when running from a ipython terminal started from pythonxy, I would get a DLL load error. If I would run the python/cython program directly (i.e. from a dos box: python then it would run fine. By default if you compile a program with mingw you need a dll with the std c or c++ library (typically this dll has a difficult name as libgcc_s_dw2-1.dll). As I have mingw installed in more than one location (32bit, 64bit, QtSDK, Python(x,y)) I think it cannot find the right dll (although I could not detect which dll it was using). The problem can be most easily solved if you link the std library statically. This you can do by simply adding "stdc++" to your libraries field in

So my new looks now something like

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
import numpy

ext_modules = [Extension("BvL_cython",["model_cython.pyx"],\

    name= 'Model class',
    cmdclass = {'build_ext': build_ext},
    ext_modules = ext_modules

(This also shows how to automatically detect the location of the numpy include directories)

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