Missing includes error when compiling on Linux about sm64coopdx HOT 1 CLOSED

This depends on your Linux distribution and how the SDL2 development files were packaged.

For example, on my distro (Void Linux), and on the MSYS2/MINGW64 Windows version, there is this useful file: /usr/include/SDL2/SDL_config.h

/* Comment this if you want to build without any C library requirements */
#define HAVE_LIBC 1
#ifdef HAVE_LIBC

#define STDC_HEADERS 1
#define HAVE_CTYPE_H 1
#define HAVE_STDIO_H 1
#define HAVE_STRING_H 1

However, when I tried to cross compile a Windows 64-bit build on Linux, these were the contents of: /usr/local/x86_64-w64-mingw32/include/SDL2/SDL_config.h

/* This is disabled by default to avoid C runtime dependencies and manifest requirements */
#ifdef HAVE_LIBC

So it turns out the source code relied in some places to have the standard C headers automatically included when using the SDL2 library:

#include <SDL2/SDL.h>
// #include <ctype.h>
// #include <stdio.h>
// #include <string.h>

Since I had installed additional headers and libraries in /usr/local/ directory without using a package manager, and that SDL2 is included in all builds (either as a Window API or a Controller Backend), then my workaround was to change the /usr/local/x86_64-w64-mingw32/bin/sdl2-config file in the following way:

--cflags)
# echo -I${prefix}/include/SDL2 -Dmain=SDL_main
echo -I${prefix}/include -Dmain=SDL_main -DHAVE_STDIO_H -DHAVE_STRING_H -DHAVE_CTYPE_H

from sm64coopdx.