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POpython_x64 + C library compiled with mingw_x64 on Windows7 Py_InitModule4
 

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  1. POpython_x64 + C library compiled with mingw_x64 on Windows7 Py_InitModule4
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    <p>I'm trying to compile C library for python on Windows7 (64-bit) using mingw-x64. It all worked like a charm with 32-bit versions.</p> <p>I used to compile my library with gcc -shared -IC:\Python27\include -LC:\Python27\libs myModule.c -lpython27 -o myModule.pyd</p> <p>and it worked with 32-bit versions. The same procedure is working with 64-bit linux. But on 64-bit windows7 (using 64-bit x86_64-w64-mingw32 and 64-bit python 2.7.5) I have a problem:</p> <pre><code>C:\Users\sergej\AppData\Local\Temp\cci8TbXw.o:myModule.c:(.text+0x267): undefined reference to `__imp_Py_InitModule4' collect2: ld returned 1 exit status </code></pre> <p>I checked C:/Python27/libs/modsupport.h and it already contains</p> <pre><code>#if SIZEOF_SIZE_T != SIZEOF_INT /* On a 64-bit system, rename the Py_InitModule4 so that 2.4 modules cannot get loaded into a 2.5 interpreter */ #define Py_InitModule4 Py_InitModule4_64 #endif </code></pre> <p>I'm currently out of ideas what to do. Any suggestion? The C code is not an issue here. I have the same problem with example from <a href="http://csl.name/C-functions-from-Python/" rel="nofollow noreferrer">http://csl.name/C-functions-from-Python/</a><br> Note - typo in line 26 in this example: should be VARARGS</p> <p>And yes - I did found (similar to <a href="https://stackoverflow.com/questions/11182765/how-can-i-build-my-c-extensions-with-mingw-w64-in-python">How can I build my C extensions with MinGW-w64 in Python?</a> question ) that I can compile this trivial example by adding -DMS_WIN64 to gcc line, but I still got the similar errors in my real program (suggesting there is more to it)</p> <pre><code>undefined reference to `__imp_PyArg_ParseTuple' undefined reference to `__imp_Py_BuildValue' undefined reference to `__imp_Py_InitModule4_64' </code></pre>
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    1. COI hate to answer my own questions, but... adding -DMS_WIN64 is actually enough. Remaining problems were due to gcc parameters ( for some reason -lpython27 should go right before -o myModule.pyd), which were not in correct order in my project
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    2. COIf you're game to recap the solution as your own answer, I'll delete my answer. (See http://meta.stackexchange.com/questions/90263/unanswered-question-answered-in-comments for elaboration of why this is helpful.) Thanks!
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