[Solved] Error multiple definition when compiling using headers [closed]

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Do not mix declaration with definition/instantiation in a .h file. Your are instantiating g_font, g_window and g_renderer in isolation.h file. The correct is instantiating only once, usually, in a .cpp

To solve your problem, change isolation.h to declare those variables as external linkage:

//load global front
extern TTF_Font* g_font;

//window
extern SDL_Window* g_window;

//renderer
extern SDL_Renderer* g_renderer;

and instantiate them only once in an appropriate .cpp file, for example, init.cpp

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solved Error multiple definition when compiling using headers [closed]