[MERGE] Fast _walkdirs for win32

[Alexander Belchenko]

Alexander Belchenko пишет:
[...]
> 2) But anyway it failed because linker cannot find Win32 API functions:
> 
> C:\work\Bazaar\mydev.packs\win32_find_files>make
> _walkdirs_win32.obj : error LNK2019: unresolved external symbol 
> __imp__FindClose referenced in function ___pyx_f_15_walkdirs_win
> 32_11Win32Finder__get_files_in
> _walkdirs_win32.obj : error LNK2019: unresolved external symbol 
> __imp__FindNextFileW referenced in function ___pyx_f_15_walkdirs
> _win32_11Win32Finder__get_files_in
> _walkdirs_win32.obj : error LNK2019: unresolved external symbol 
> __imp__GetLastError referenced in function ___pyx_f_15_walkdirs_
> win32_11Win32Finder__get_files_in
> _walkdirs_win32.obj : error LNK2019: unresolved external symbol 
> __imp__FindFirstFileW referenced in function ___pyx_f_15_walkdir
> s_win32_11Win32Finder__get_files_in
> bzrlib\_walkdirs_win32.pyd : fatal error LNK1120: 4 unresolved externals
> Building of "bzrlib._walkdirs_win32" extension failed, will use the 
> Python version instead
> 
> 
> I found that if I compile _walkdirs_win32.c with custom setup.py 
> (without involving Pyrex at all)
> I get the same error. When I looked at the generated C code I saw this 
> definition:
> 
> #ifndef WIN32
>   #define __stdcall
>   #define __cdecl
> #endif
> 
> If I manually add
> 
> #define WIN32_LEAN_AND_MEAN
> #include <windows.h>
> 
> before mentioned lines *then* module compiled successfully without any 
> warning or error.
> I don't know is it Pyrex bug or not.

More info on this: I found that if I add

define_macros=[('WIN32', None)]

in my custom setup.py
then I can build C-extension successfully. But with Pyrex this does not work,
probably Pyrex does not pass this variable to distutils build_ext.

Here is my simple custom setup.py:

from distutils.core import setup, Extension

setup(name = "_walkdirs_win32",
       ext_modules = [Extension('_walkdirs_win32', ['_walkdirs_win32.c'],
                                define_macros=[('WIN32', None)])
                     ]
      )