[Pyrex] problem building simple package with extensions in Windows, but not OS X

[Lenard Lindstrom]

Brian Blais wrote:
> Hello,
>
> I am trying to build a package of mine, and for some reason the build 
> process with distutils is failing in Windows, but not in OS X (and I 
> imagine also in Linux, but I haven't tested it).  I am not sure if 
> this is a Pyrex problem, a distutils problem, or me doing something 
> stupid problem.  :)
>
> I boiled it down to the simplest package that still fails.  My 
> setup.py is:
>
> from distutils.core import setup
> from distutils.extension import Extension
> from Pyrex.Distutils import build_ext
>
> setup(
>   name = 'myproject',
>   version='0.0.1',
>   description="Here is a description",
>   author="Brian Blais",
>   ext_modules=[ 
>     Extension("myproject/train",["myproject/train.pyx"]),
>     ],
>     
>   packages=['myproject'],
>   
>   cmdclass = {'build_ext': build_ext}
> )
>
>
>
> and my project has one directory, myproject, with two files. 
>  train.pyx is:
>
> def func(blah):
>     
>     print blah
>     
>
> and an __init__.py, which has the single line:
>
> import train
>
>
> So, in OS X, I can do
>
> python setup.py build
>
> and the build goes through.  In windows, with the same basic setup 
> (version numbers all below), I get:
>
> [Desktop\test]|5> !python setup.py build
> running build
> running build_py
> creating build
> creating build\lib.win32-2.5
> creating build\lib.win32-2.5\myproject
> copying myproject\__init__.py -> build\lib.win32-2.5\myproject
> running build_ext
> building 'myproject/train' extension
> creating build\temp.win32-2.5
> creating build\temp.win32-2.5\Release
> creating build\temp.win32-2.5\Release\myproject
> c:\mingw\bin\gcc.exe -mno-cygwin -mdll -O -Wall -Ic:\python25\include 
> -Ic:\pytho
> n25\PC -c myproject/train.c -o 
> build\temp.win32-2.5\Release\myproject\train.o
> writing build\temp.win32-2.5\Release\myproject\train.def
> c:\mingw\bin\gcc.exe -mno-cygwin -shared -s 
> build\temp.win32-2.5\Release\myproje
> ct\train.o build\temp.win32-2.5\Release\myproject\train.def 
> -Lc:\python25\libs -
> Lc:\python25\PCBuild -lpython25 -lmsvcr71 -o 
> build\lib.win32-2.5\myproject/train
> .pyd
> Cannot export initmyproject/train: symbol not defined
> collect2: ld returned 1 exit status
> error: command 'gcc' failed with exit status 1
>
>
>
> On both the Mac and the PC I have:
>
> Python 2.5.1 
> Pyrex version 0.9.5.1a
> distutils 2.5.1
>
>
>
> am I doing something wrong?

In setup.py try replacing:

    Extension("myproject/train",["myproject/train.pyx"]),

with:

    Extension("myproject.train",["myproject/train.pyx"]),

When compiling with MinGW distutils creates a def file to export the 
module's init routine. When it encountered the backslash in 
"myproject/train" it didn't know what to do with it, so tried to export 
function initmyproject/train, which is definitely wrong. But distutils 
recognizes the dot as a part of a qualified Python module name so 
removes the package part. Installing the package shows that everything 
goes to the right place.

-- 
Lenard Lindstrom
<len-l at telus.net>