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POpy2app import breaks cython
 

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    <p>I'm using the basic "hello world" demo straight out of the Cython documentation. It works fine unless I try to import py2app in the same setup.py file:</p> <pre><code>import py2app from distutils.core import setup from distutils.extension import Extension from Cython.Distutils import build_ext setup( cmdclass = {'build_ext': build_ext}, ext_modules = [Extension("helloworld", ["helloworld.pyx"])] ) </code></pre> <p>Py2app itself works fine as long as I pre-generate the <code>.c</code> files for my Cython modules. But if I haven't, then <code>build_ext</code> fails with:</p> <pre><code>running build_ext gcc-4.2 not found, using clang instead building 'helloworld' extension clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c helloworld.c -o build/temp.macosx-10.6-intel-2.7/helloworld.o clang: error: no such file or directory: 'helloworld.c' clang: error: no input files error: command 'clang' failed with exit status 1 </code></pre> <p><b>If I comment out <code>import py2app</code> in setup.py, <code>build_ext</code> works fine</b> and I get the missing intermediate step in my compilation:</p> <pre><code>... gcc-4.2 not found, using clang instead cythoning helloworld/helloworld.pyx to helloworld/helloworld.c building 'helloworld' extension ... </code></pre> <p>So what is it about py2app that breaks Cython? And what can I do about it? I'd like to have just one setup.py for my project, obviously.</p> <p>I have Cython 0.18 and py2app 0.7.2, installed from PyPI. I'm using Mac OS X 10.8 with the python.org Python 2.7.3, not Apple's build.</p>
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    1. COWhat happens when you replace "import py2app" by "import setuptools"? Py2app itself doesn't patch distutils, but does use setuptools.
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      1. USRonald Oussoren
    2. COAlso: this might be related to [this issue](https://bitbucket.org/tarek/distribute/issue/195) in the distribute issue tracker.
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      1. USRonald Oussoren
    3. COHooray, that was the problem. `import setuptools` also broke Cython. Installing `distribute` (0.6.36) instead of `setuptools` (0.6.c11) fixed it. Please submit as an answer and I'll accept it...
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