C:/MinGW/lib/libmingw32.a(main.o):main.c:(.text+0x104): undefined reference to `WinMain@16'

需要加 -lmingw32 

例如使用minGW32 ：执行g++命令：g++ -o mysql.exe main.cpp -lmingw32 -lSDLmain -lSDL

main.cpp

#include <stdio.h>

#include "SDL/SDL.h"


#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32

void setpixel(SDL_Surface *screen, int x, int y, Uint8 r, Uint8 g, Uint8 b)
{
    Uint32 *pixmem32;
    Uint32 colour;

    colour = SDL_MapRGB( screen->format, r, g, b );

    pixmem32 = (Uint32*) screen->pixels + y + x;
    *pixmem32 = colour;
}

void DrawScreen(SDL_Surface* screen, int h)
{
    int x, y, ytimesw;

    if(SDL_MUSTLOCK(screen))
    {
        if(SDL_LockSurface(screen) < 0) return;
    }

    for(y = 0; y < screen->h; y++ )
    {
        ytimesw = y*screen->pitch/BPP;
        for( x = 0; x < screen->w; x++ )
        {
            setpixel(screen, x, ytimesw, (x*x)/256+3*y+h, (y*y)/256+x+h, h);
        }
    }

    if(SDL_MUSTLOCK(screen)) SDL_UnlockSurface(screen);

    SDL_Flip(screen);
}

int main(int argc, char* argv[])
{
	printf("hello world !");
    SDL_Surface *screen;
    SDL_Event event;

    int keypress = 0;
    int h=0;

    if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;

    if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_HWSURFACE)))
    {
        SDL_Quit();
        return 1;
    }

    while(!keypress)
    {
        DrawScreen(screen,h++);
        while(SDL_PollEvent(&event))
        {
            switch (event.type)
            {
                case SDL_QUIT:
                    keypress = 1;
                    break;
                case SDL_KEYDOWN:
                    keypress = 1;
                    break;
            }
        }
    }

    SDL_Quit();

    return 0;
}

参数 -l （小写的L）使库文件得以与源文件一起编译和连接。（简单的可以认为-labc即连接了名称符合libabc.*的所有库文件）
最后说明的两个参数是：-mconsole 和 -mwindows
他们的效果是使可执行程序是带命令行控制窗口的或者是纯Windows窗口的，缺省情况下应该是带命令行控制窗口的。
运行mysdl.exe可以看到文件的执行情况。