Building Wine with MinGW cross-compilation

[Rutger Helling <rhelling@mykolab.com>]

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Hello Guix, 

in recent versions Wine (Wine-Staging in our case) gained the ability to
build modules as PE files for better compatibility. I've been trying to
get this working and was wondering if someone more familiar with
cross-compilation knows what's going wrong with the compilation. 

First I tried adding mingw-w64 to the native-inputs. This results in a
configure error: "C compiler cannot create executables". See
wine-patch1.patch for the patch and wine-patch1-config.log for the
configuration log. 

I've had a little more success with adding MinGW triplets of cross-gcc
and cross-binutils to native-inputs. See wine-patch2.patch and
wine-patch2-config.log. 
The configure phase does work this time and MinGW cross-compilation
seems to be recognized. However during compiling eventually I get a
failure regarding #include_next and stdarg.h: 

---
In file included from data_formats.c:23:0:
/gnu/store/fhsaq7gzg7gkkg0wyix6w1nm96fhs7bh-gcc-cross-sans-libc-i686-w64-mingw32-7.4.0/lib/gcc/i686-w64-mingw32/7.4.0/include/stdarg.h:1:15:
fatal error: stdarg.h: No such file or directory
#include_next <stdarg.h>
^~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:227: data_formats.cross.o] Error 1
make[1]: Leaving directory
'/tmp/guix-build-wine-staging-4.13.drv-0/wine-4.13/dlls/dinput'
make: *** [Makefile:3209: dlls/dinput/libdinput.cross.a] Error 2
make: *** Waiting for unfinished jobs....
i686-w64-mingw32-gcc -c -o adsiid.cross.o adsiid.c -I. -I../../include
-D__WINESRC__ -DWINE_CROSS_PE -Wall -g -O2
In file included from adsiid.c:21:0:
/gnu/store/fhsaq7gzg7gkkg0wyix6w1nm96fhs7bh-gcc-cross-sans-libc-i686-w64-mingw32-7.4.0/lib/gcc/i686-w64-mingw32/7.4.0/include/stdarg.h:1:15:
fatal error: stdarg.h: No such file or directory
#include_next <stdarg.h>
^~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:176: adsiid.cross.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory
'/tmp/guix-build-wine-staging-4.13.drv-0/wine-4.13/dlls/adsiid'
make: *** [Makefile:8515: dlls/adsiid] Error 2
--- 

If I add cross-libc it just seems to add mingw-w64 again and I get the
same error about the C compiler not being able to create executables. 

Does anyone have any ideas on how to fix this?

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