https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80594
d25fe0be@ <d25fe0be at outlook dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |d25fe0be at outlook dot com --- Comment #1 from d25fe0be@ <d25fe0be at outlook dot com> --- $ grep SDL_Window test.ii SDL_Window* window; $ Just as what the compiler says, SDL_Window is not declared (at least in the attached preprocessed source file). Make sure you have included the appropriate header files, and SDL_Window's declaration is not guarded by some macro(s) that are missing when compiling with GCC.