[Distutils] trouble building C extensions with mingw

M.-A. Lemburg mal at egenix.com
Wed Dec 7 15:31:09 CET 2005

mike cantor wrote:
> I am having difficulty getting disutils to build C extensions using the 
> mingw compiler.
> After installing mingw (file: MinGW-4.1.0.exe) I followed the instructions 
> described in http://sebsauvage.net/python/mingw.html, using pexports and 
> dlltool as instructed and placing libpython23.a the python installation 
> directory.  As was noted in this page, disutils did not have to be tweaked.
> I then copied example.c and example.i and setup.py to the same folder and 
> from within that directory in a dos prompt ran "python setup.py build 
> -cmingw32 "
> The result was the following compiler errors:
> E:\RESEARCH\Modeling\PythonFiles\SWIG test>python setup.py build -c mingw32
> running build
> running build_ext
> building 'example' extension
> swigging example.i to example_wrap.c
> E:\swigwin-1.3.27\swig.exe -python -o example_wrap.c example.i
> C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IE:\Python23\include 
> -IE:\Pytho
> n23\PC -c example_wrap.c -o build\temp.win32-2.3\Release\example_wrap.o
> example_wrap.c: In function `_wrap_My_variable_set':
> example_wrap.c:1621: error: `My_variable' undeclared (first use in this 
> function
> )
> example_wrap.c:1621: error: (Each undeclared identifier is reported only once
> example_wrap.c:1621: error: for each function it appears in.)
> example_wrap.c: In function `_wrap_My_variable_get':
> example_wrap.c:1631: error: `My_variable' undeclared (first use in this 
> function
> )
> example_wrap.c: In function `_wrap_fact':
> example_wrap.c:1648: warning: implicit declaration of function `fact'
> example_wrap.c: In function `_wrap_my_mod':
> example_wrap.c:1676: warning: implicit declaration of function `my_mod'
> example_wrap.c: In function `_wrap_get_time':
> example_wrap.c:1692: warning: implicit declaration of function `get_time'
> error: command 'gcc' failed with exit status 1
> Can anyone tell me where to go from here?  I have been trying to get this 
> to work for three days now...

You should have a look at the generated example_wrap.c file.
It appears as if you have a missing library somewhere in
the chain, e.g. the lib that you are trying to wrap.

Marc-Andre Lemburg

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