How to cross-compile with SDL 2 from Linux for Windows - c++

Question

I tried to compile a simple C++ program that uses SDL 2 with the mingw-w64-g++ compiler on my Arch Linux (64bits).
For this I downloaded SDL2-devel-2.0.4-mingw.tar.gz from here
prog.cpp:
#include <SDL.h>
int main ()
{
SDL_Init (SDL_INIT_VIDEO);
SDL_Window *sdlWnd = SDL_CreateWindow ("Test", SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, 800, 600, 0);
SDL_Event event;
bool running = true;
while (running) {
while (SDL_PollEvent (&event)) {
if (event.type == SDL_QUIT) {
running = false;
break;
}
}
}
return 0;
}
Makefile:
GPP = x86_64-w64-mingw32-g++
prog.exe: prog.o
$(GPP) -o prog.exe prog.o -LSDL2-2.0.4/lib/x64 -lSDL2main -lSDL2
prog.o: prog.cpp
$(GPP) -o prog.o -c -ISDL2-2.0.4/include prog.cpp
Now making gives the error:
x86_64-w64-mingw32-g++ -o prog.exe prog.o -LSDL2-2.0.4/lib/x64 -lSDL2main -lSDL2
Warning: corrupt .drectve at end of def file
SDL2-2.0.4/lib/x64/SDL2main.lib(./x64/Release/SDL_windows_main.obj):(.text[main]+0x1c): undefined reference to `SDL_main'
Why undefined reference to `SDL_main' ? Although I specified -lSDL2main ?
What did I do wrong? :(

Answer 1

Okay, it was because of the main functions signature, that has to be declared as:
int main(int argc, char *argv[])
according to the official SDL FAQ:
Make sure that you are declaring main() as:
#include "SDL.h"
int main(int argc, char *argv[])
You should be using main() instead of WinMain() even though you are
creating a Windows application, because SDL provides a version of
WinMain() which performs some SDL initialization before calling your
main code. If for some reason you need to use WinMain(), take a look
at the SDL source code in src/main/win32/SDL_main.c to see what kind
of initialization you need to do in your WinMain() function so that
SDL works properly.