Triangle (SDL2) on MSYS2

main.c

// Build (MSYS2)
// gcc -Wall -pedantic main.c `sdl2-config --cflags --libs` 

#include <SDL.h>
#include <stdbool.h>

int main(int argc, char** argv) {

    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_Window* window = SDL_CreateWindow(
            "SDL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(
            window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

    SDL_Vertex vertex_1 = {{400, 150}, {255, 0, 0, 255}, {0, 0}};
    SDL_Vertex vertex_2 = {{200, 450}, {0, 0, 255, 255}, {0, 0}};
    SDL_Vertex vertex_3 = {{600, 450}, {0, 255, 0, 255}, {0, 0}};

    SDL_Vertex vertices[] = {
        vertex_1,
        vertex_2,
        vertex_3
    };

    bool running = true;
    while(running)
    {
        SDL_Event ev;
        while(SDL_PollEvent(&ev))
        {
            if((SDL_QUIT == ev.type) ||
                    (SDL_KEYDOWN == ev.type && SDL_SCANCODE_ESCAPE == ev.key.keysym.scancode))
            {
                running = false;
                break;
            }
        }

        SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
        SDL_RenderClear(renderer);
        SDL_RenderGeometry(renderer, NULL, vertices, 3, NULL, 0);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}