Game doesn't compile with mingw-w64 targetting Windows on Linux

[rawr51919]

Describe the bug
mingw-w64 fails to compile sm64ex when make is ran using the tools mingw-w64 provides for Ubuntu Linux to cross-compile the game for Windows.

To Reproduce
Steps to reproduce the behavior:

1. Use make WINDOWS_BUILD=1 CROSS=x86_64-w64-mingw32- CC=x86_64-w64-mingw32-gcc CXX=x86_64-w64-mingw32-g++ SDLCONFIG=sdl2-config TEXTURE_FIX=1 NODRAWINGDISTANCE=1 DISCORDRPC=1 to attempt a compile using mingw-w64
2. Game compiles until the final exe link
3. We hit the linker errors described below.

Expected behavior
Game compiles successfully

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS] Windows 10 Pro Education + WSL2 (Ubuntu 20.04.2 LTS)

Additional context
Trying to add more options for us folks to compile the PC port easily so I looked further into mingw-w64 cross-compilation and this is as far as I've been able to go with it. I previously have been able to achieve this type of cross-compilation using MXE, both prepackaged and from source, so it's not like it's my first rodeo with this or anything.

[rawr51919]

This was also discovered during the testing process of PR #456, which is why you see elements from that here in the screenshots.

[rawr51919]

When make clean was ran, a different error ensued

[fgsfdsfgs]

Are you sure it's using the correct sdl2-config?

[rawr51919]

mingw-w64 doesn't have an sdl2-config, so it has to use an sdl2-config from somewhere else

[rawr51919]

It has one on MSYS2 but not here with the mingw-w64 libraries for Ubuntu

[fgsfdsfgs]

Well that would point to your local /lib and /include directories and not the the mingw ones, which is why it can't find SDL.h.

[rawr51919]

I wonder if this requires it's own set of ifdefs to fix
Or perhaps mingw-w64 needs to be pointed to the local lib/include directories via symlinks to the files?

[fgsfdsfgs]

It does not require any code changes to fix. At worst Makefile changes, but I believe this can probably be fixed on your side completely.
Are you sure your SDL2 lib in mingw doesn't come with its own sdl2-config? It normally does in mingw-w64.

[rawr51919]

This is using WSL and Ubuntu, whose mingw-w64 doesn't have sdl2-config as a package.

[rawr51919]

The closest I have for an sdl2-config would be the mingw-w64 sdl2-config the AUR has

[fgsfdsfgs]

sdl2-config is not a separate package. It's a script that invokes pkg-config and it is part of your SDL2 package:

$ pacman -Ql mingw-w64-i686-SDL2
mingw-w64-i686-SDL2 /mingw32/
mingw-w64-i686-SDL2 /mingw32/bin/
mingw-w64-i686-SDL2 /mingw32/bin/sdl2-config
mingw-w64-i686-SDL2 /mingw32/bin/SDL2.dll
mingw-w64-i686-SDL2 /mingw32/include/
mingw-w64-i686-SDL2 /mingw32/include/SDL2/
mingw-w64-i686-SDL2 /mingw32/include/SDL2/begin_code.h
mingw-w64-i686-SDL2 /mingw32/include/SDL2/close_code.h
mingw-w64-i686-SDL2 /mingw32/include/SDL2/SDL.h
...

Actually my bad, it doesn't invoke pkg-config, but still.