SDL错误架构x86_64的未定义符号“_SDL_main” [英] SDL Error Undefined symbols for architecture x86_64 "_SDL_main"

问题描述

我使用C + + SDL Cocoa和Foundation框架在我的Mac OS X。我收到以下错误

I am using C++ with the SDL Cocoa and Foundation framework on my mac os x. I get the following error

Undefined symbols for architecture x86_64:
  "_SDL_main", referenced from:
      -[SDLMain applicationDidFinishLaunching:] in SDLMain.o
ld: symbol(s) not found for architecture x86_64

当我运行下面的代码

#import <Foundation/Foundation.h>
#import <SDL/SDL.h>
#include "SDLMain.h"
int main(int argc, const char * argv[])
{
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_SetVideoMode(640,480,32,SDL_DOUBLEBUF);
    SDL_Event event;
    bool isRunning = true;
    while(SDL_PollEvent(&event)){
        if(event.type == SDL_QUIT){
            isRunning=false;
        }
    }

    SDL_Quit();
    return 0;
}

我不知道有什么问题， SDLMain.m文件并注释掉这行代码

I have no idea what is wrong, although it seems that when I go into the SDLMain.m file and comment out this line of code

status = SDL_main (gArgc, gArgv);

程序编译没有问题。但是，它不工作。没有窗口打开像它的应该。有任何想法吗？

the program compiles with no problems. However, it doesn't work. No window opens like its supposed to. Any ideas?

推荐答案

我猜你的 main 函数签名不正确。您使用：

I bet your main function signature is incorrect. You use:

int main(int argc, const char * argv[])
                   ^^^^^

但SDL_main.h想要

but SDL_main.h wants

int main(int argc, char *argv[])

为什么？

你看，SDL在编译时做的事情真的很可怕：它重命名你的 main 函数到 SDL_main ，注入自己的main函数，然后调用你的函数。

You see, SDL does something really horrific when compiling: It renames your main function to SDL_main, injecting its own main function which, in turn, calls yours.

注意，工作，那么你可能正在编译错误的标志。可以输入以下内容获取标志：

Note that if this doesn't work, then you may be compiling with wrong flags. To be sure, get the flags by typing:

$ sdl-config --cflags --libs

有关详细信息，请参阅只包括SDL头导致链接器错误

For more information, see Simply including SDL header causes linker error

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