python_x64 + C library compiled with mingw_x64 on Windows7 Py_InitModule4

Question

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.

I used to compile my library with gcc -shared -IC:\Python27\include -LC:\Python27\libs myModule.c -lpython27 -o myModule.pyd

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:

C:\Users\sergej\AppData\Local\Temp\cci8TbXw.o:myModule.c:(.text+0x267): 
undefined reference to `__imp_Py_InitModule4'
collect2: ld returned 1 exit status

I checked C:/Python27/libs/modsupport.h and it already contains

#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

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 http://csl.name/C-functions-from-Python/
Note - typo in line 26 in this example: should be VARARGS

And yes - I did found (similar to How can I build my C extensions with MinGW-w64 in Python? 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)

undefined reference to `__imp_PyArg_ParseTuple'
undefined reference to `__imp_Py_BuildValue'
undefined reference to `__imp_Py_InitModule4_64'

I 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 — Sergej Srepfler
– Sergej Srepfler, Commented Sep 10, 2013 at 16:06
If you're game to recap the solution as your own answer, I'll delete my answer. (See meta.stackexchange.com/questions/90263/… for elaboration of why this is helpful.) Thanks! — DreadPirateShawn
– DreadPirateShawn, Commented Oct 10, 2013 at 5:02

Community · Accepted Answer · 2017-05-23 10:28:51Z

9

Copying the answer from the comments in order to remove this question from the "Unanswered" filter:

I 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

~ answer per Sergej Srepfler

edited May 23, 2017 at 10:28

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answered Oct 10, 2013 at 5:01

DreadPirateShawn

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