OS X 10.11上的SDL2和CMake

Question

我知道有一些答案（例如here ， here或here ），但我無法使其正常工作：

考慮一個MWE main.cpp

// depending on the source of the example,
// one of the two includes is used
//#include <SDL2/SDL.h>
#include "SDL.h"

int main() {
    //Start SDL
    SDL_Init( SDL_INIT_EVERYTHING );
    //Quit SDL
    SDL_Quit();
    return 0;
}

我在OS X 10.11上下載了 SDL2 v2.0.4，並將SDL2.framework文件復制到了/ Library / Frameworks文件夾中。

現在，我試圖找到一個有效的CMake腳本來編譯main.cpp 。

首先我嘗試

find_package(SDL)
add_executable(example main.cpp)
target_include_directories(example ${SDL_INCLUDE_DIR})
target_link_libraries(example ${SDL_LIBRARY})

但是我收到錯誤消息

Could NOT find SDL (missing:  SDL_LIBRARY) (found version "2.0.4")
CMake Error at CMakeLists.txt:3 (target_include_directories):
  target_include_directories called with invalid arguments

如果我在cmake子目錄中包含FindSDL2.cmake並使用腳本

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIR})
add_executable(example main.cpp)

CMake的作品，但我得到一個鏈接器錯誤：

Undefined symbols for architecture x86_64:
  "_SDL_Init", referenced from:
      _main in main.cpp.o
  "_SDL_Quit", referenced from:
      _main in main.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

您是否知道我的問題是什么以及如何以這種方式正確使用SDL2？

Answer 1

您需要為目標添加target_link_libraries(YOUR_TARGET ${SDL2_LIBRARY}) -它不針對sdl進行鏈接。

如果運行make VERBOSE=1 ，則可以看到實際的鏈接。