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POHow to compile .c code from Cython with gcc
 

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  1. POHow to compile .c code from Cython with gcc
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    <p>Now that I've successfully installed Cython on Windows 7, I try to compile some Cython code using Cython, but gcc makes my life hard.</p> <pre><code>cdef void say_hello(name): print "Hello %s" % name </code></pre> <p>Using gcc to compile the code throws dozens of <strong>undefined reference to</strong> -erros, and I'm pretty sure the <code>libpython.a</code> is available (as the installation tutorial said, <em>undefined reference to</em> -errors are thrown if this file is missing).</p> <pre><code>$ cython ctest.pyx $ gcc ctest.c -I"C:\Python27\include" </code></pre> <p></p> <pre><code>C:\Users\niklas\AppData\Local\Temp\cckThGrF.o:ctest.c:(.text+0x1038): undefined reference to `_imp__PyString_FromStringAndSize' C:\Users\niklas\AppData\Local\Temp\cckThGrF.o:ctest.c:(.text+0x1075): undefined reference to `_imp___Py_TrueStruct' C:\Users\niklas\AppData\Local\Temp\cckThGrF.o:ctest.c:(.text+0x1086): undefined reference to `_imp___Py_ZeroStruct' C:\Users\niklas\AppData\Local\Temp\cckThGrF.o:ctest.c:(.text+0x1099): undefined reference to `_imp___Py_NoneStruct' C:\Users\niklas\AppData\Local\Temp\cckThGrF.o:ctest.c:(.text+0x10b8): undefined reference to `_imp__PyObject_IsTrue' c:/program files/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libmingw32.a(main.o):main.c:(.text+0xd2): undefined reference to `WinMain@16' collect2: ld returned 1 exit status </code></pre> <p>The weird thing is, using <code>pyximport</code>* or a <code>setup</code>-script works pretty fine, but it's both not very handy when still working on a module. <br/> <br/></p> <h2><strong>How to compile those <code>.c</code> files generated with Cython using gcc ?</strong></h2> <p><em>or any other compiler, important is that it will work !</em></p> <p><br/></p> <p><code>*pyximport</code>: Is it normal that only python-native functions and classes are contained in the imported module and not cdef-functions and classes ? like:</p> <pre><code># filename: cython_test.pyx cdef c_foo(): print "c_foo !" def foo(): print "foo !" c_foo() </code></pre> <p></p> <pre><code>import pyximport as p; p.install() import cython_test cython_test.foo() # foo !\nc_foo ! cython_test.c_foo() # AttributeError, module object has no attribute c_foo </code></pre> <p><br/></p> <h2><strong>UPDATE</strong></h2> <p>Calling <code>$ gcc ctest.c "C:\Python27\libs\libpython27.a"</code> kills the <strong>undefined reference to</strong> -erros, but this one:</p> <pre><code>c:/program files/mingw/bin/../lib/gcc/mingw32/4.5.2/../../../libmingw32.a(main.o):main.c:(.text+0xd2): undefined reference to `WinMain@16' </code></pre>
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    1. COThe "undefined reference to `WinMain@16'" means that the gcc is looking (without luck) for the "main" entry point. See for instance http://stackoverflow.com/questions/5259714/undefined-reference-to-winmain16
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