Linking issues when building cython

[Corrin Meyer]

I am having an issue when trying to install Cython on Windows 7.

I have a fresh install of Python 2.7.10, open a 'cmd' window and then try to install cython using the command 'pip install cython'.  It tries to build and apparently link the C-extensions but ends with the following error:

C:\Programs\mingw-w64\i686-4.9.2-posix-dwarf-rt_v4-rev2\mingw32\bin\gcc.exe -shared -s c:\users\corrin~1\appdata\local\temp\pip-build-srrbvr\cython\cython\plex\scanners.o c:\users\corrin~1\appdata\local\temp\pip-build-srrbvr\cython\cython\plex\Scanners.def -LC:\Python27\libs -LC:\Python27\PCbuild -lpython27 -lmsvcr90 -o build\lib.win32-2.7\Cython\Plex\Scanners.pyd

C:\Python27\libs/libpython27.a: error adding symbols: File format not recognized

collect2.exe: error: ld returned 1 exit status

error: command 'C:\\Programs\\mingw-w64\\i686-4.9.2-posix-dwarf-rt_v4-rev2\\mingw32\\bin\\gcc.exe' failed with exit status 1

I am using the 32-bit version of Python 2.7.10 and the 32-bit mingw-builds version of mingw-w64 (GCC 4.9.2 for i686, posix threads, dwarf exception handling, build revision 2).  I have created a 'C:\Python27\Libs\distutils\distutils.cfg' file with the contents:

[build]

compiler=mingw32

I have also tried the vanilla MinGW compiler and several different version of the mingw-build compiler for GCC 4.9.2. with varying results.  Of particular interest, with vanilla MinGW it skips 'libpython27.a' as incompatible and tries 'python27.lib' instead.  At this point I am at a loss for what is going on or wrong here.  Additionally, there doesn't seem to be any relatively current information on building Cython for windows (or for python c-extensions in general).

[Chris Barker]

On Tue, May 26, 2015 at 9:05 AM, Corrin Meyer <corrin...@gmail.com> wrote:

 Additionally, there doesn't seem to be any relatively current information on building Cython for windows (or for python c-extensions in general).

the current state of affairs is that it's easiest to use the MS compiler -- specifically the one here:

http://www.microsoft.com/en-us/download/details.aspx?id=44266

then make sure to use setuptools, rather than raw distutils (or pip) to compile, and you should be good to go.

And yes, you should be able to use mingw -- particularly for 32 bit, but that is a bit of a moving target...

-CHB

 

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