A variable that lets you provide a file with extra gamecontroller db entries.
Defined in <SDL3/SDL_hints.h>
#define SDL_HINT_GAMECONTROLLERCONFIG_FILE "SDL_GAMECONTROLLERCONFIG_FILE"
The file should contain lines of gamecontroller config data, see SDL_gamepad.h
You can update mappings after SDL is initialized with SDL_GetGamepadMappingForGUID() and SDL_AddGamepadMapping()
This hint should be set before SDL is initialized.
This hint is available since SDL 3.0.0.