无法使用SDL进行编译：体系结构x86_64的未定义符号

Question

我正在尝试使用SDL2库进行编译，但没有成功。

OS: MacOS 10.13.2
Visual Studio Code 1.43.1
Language: c++

我正在使用Lazy Foo的非常基本的示例代码。这是我收到的消息：

[Running] cd "/Users/martinjoselizondocolomes/Programacion/01_hello_SDL/" && g++ 01_hello_SDL.cpp -o 01_hello_SDL && "/Users/martinjoselizondocolomes/Programacion/01_hello_SDL/"01_hello_SDL
Undefined symbols for architecture x86_64:
  "_SDL_CreateWindow", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_Delay", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_DestroyWindow", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_FillRect", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_GetError", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_GetWindowSurface", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_Init", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_MapRGB", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_Quit", referenced from:
      _main in 01_hello_SDL-a16d96.o
  "_SDL_UpdateWindowSurface", referenced from:
      _main in 01_hello_SDL-a16d96.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[Done] exited with code=1 in 0.168 seconds

Answer 1

构建C ++代码需要三个阶段：

Preprocessor处理宏和#include指令，因此在此步骤中需要您的头文件。

Compiler生成目标文件。这样就可以在源文件中检查语法了。

Linker将目标文件和库组合成可执行文件，因此您的运行时库必须可用并且已指定给链接器。

对于g ++，您可以通过在命令行上给出库的全名来指定库，或使用-l快捷方式来找出正确的前缀（lib）和后缀。因此，根据您的情况，我相信您可以添加-lSDL。