c - 为什么 gcc 不链接 SDL 2.0 C 项目？ (苹果系统)

Question

这个问题已经有答案了:

What is an undefined reference/unresolved external symbol error and how do I fix it? (39 个回答)

How to use SDL with gcc? (1 个回答)

已关闭 3 年前。

我用 C 语言编写了一个简单的 Chip-8 模拟器(主要是从 this 获得灵感；说实话，只是用 C 语言重写了它)。它使用 SDL 2.0，我肯定已经安装了。

当我尝试编译文件( gcc main.c chip8.c -o chip8 )时，我收到了一堆错误:

Undefined symbols for architecture x86_64:
  "_SDL_CreateRenderer", referenced from:
      _main in main-638d2a.o
  "_SDL_CreateTexture", referenced from:
      _main in main-638d2a.o
  "_SDL_CreateWindow", referenced from:
      _main in main-638d2a.o
  "_SDL_GetError", referenced from:
      _main in main-638d2a.o
  "_SDL_Init", referenced from:
      _main in main-638d2a.o
  "_SDL_PollEvent", referenced from:
      _main in main-638d2a.o
  "_SDL_RenderClear", referenced from:
      _main in main-638d2a.o
  "_SDL_RenderCopy", referenced from:
      _main in main-638d2a.o
  "_SDL_RenderPresent", referenced from:
      _main in main-638d2a.o
  "_SDL_RenderSetLogicalSize", referenced from:
      _main in main-638d2a.o
  "_SDL_UpdateTexture", referenced from:
      _main in main-638d2a.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我非常确定我使用了正确的 #include ( #include "SDL2/SDL.h" )。这是我的项目结构:

chip-8
—— main.c
–– chip8.c
–– chip8.h
–– INVADERS (rom file)

为什么链接器不能使用这个？是否需要任何其他编译器标志？

Answer 1

Why doesn't the linker work with this? Are any other compiler flags required?

是的，您需要告诉链接器要链接哪些库，例如:

-lSDL2

参见How to use SDL with gcc?