SDL2 in Emscripten: key.keycode.sym returns a scancode instead of a keycode

[giogadi]

When I inspect the keycode associated with a keydown event using event.key.keysym.sym, the value returned is a SDL_Scancode instead of a SDL_Keycode. I would expect event.key.keysym.sym to return a SDL_Keycode according to the SDL documentation. Example:

SDL_Event e;
while (SDL_PollEvent(&e) != 0) {
    if (e.type == SDL_KEYDOWN) {
        if (e.key.keysym.sym == SDLK_a) {
            printf("When I press the A key on my keyboard, this branch does NOT execute\n");
        } else if (e.key.keysym.sym == SDL_SCANCODE_A) {
            printf("This branch DOES execute when I press the A key on my keyboard.\n");
        }
    }
}

I'm using Emscripten 3.1.54, which uses SDL 2.26.0. I'm compiling the code with the following command:

emcc main.c -o index.html -sUSE_SDL=2

I'm opening the generated page in Chrome Version 121.0.6167.160 on MacOS 11.7.10.

[giogadi]

I was apparently including the wrong SDL header: I was including <SDL/SDL.h> when I should have been including <SDL.h>.