我该如何使用CMake连接SDL2？

Question

我使用了https://github.com/brendan-w/collector/tree/master/cmake中的.cmake文件，并将它们放在与我的CMakeLists.txt相同的目录中，然后我使用了以下代码：

set(CMAKE_MODULE_PATH FindSDL2.cmake FindSDL2_image.cmake)
find_package(SDL2 REQUIRED)

但是我收到了错误提示：

CMake Error at CMakeLists.txt:26 (find_package):
  By not providing "FindSDL2.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "SDL2", but
  CMake did not find one.

  Could not find a package configuration file provided by "SDL2" with any of
  the following names:

    SDL2Config.cmake
    sdl2-config.cmake

  Add the installation prefix of "SDL2" to CMAKE_PREFIX_PATH or set
  "SDL2_DIR" to a directory containing one of the above files.  If "SDL2"
  provides a separate development package or SDK, be sure it has been
  installed.

- user3063750

---

CMAKE_MODULE_PATH 是一个目录，包含模块，而不是模块列表本身。 - Tsyvarev

Answer 1

CMAKE_MODULE_PATH 变量包含了一组指向 CMake 模块的路径（例如 FindSDL2.cmake，FindSDL2_image.cmake 等）。您应该将这些模块在您的机器上的完整路径添加到此变量中：

list(APPEND CMAKE_MODULE_PATH /path/to/your/SDL2/modules)
find_package(SDL2 REQUIRED)

最近，SDL2提供了一个CMake配置文件，可以帮助CMake找到您的SDL2安装。您的错误消息明确描述了这一点，并指出包配置名称（SDL2Config.cmake和sdl2-config.cmake）。要使用此方法让CMake找到SDL2，请使用CMAKE_PREFIX_PATH：

list(APPEND CMAKE_PREFIX_PATH /path/to/your/SDL2/config/files)
find_package(SDL2 REQUIRED)

一旦CMake找到了包，它将定义一些SDL2_*变量，可用于您的CMake项目：

...

add_executable(MySDL2Executable main.cpp)
include_directories(MySDL2Executable PRIVATE ${SDL2_INCLUDE_DIRS})
target_link_libraries(MySDL2Executable PRIVATE ${SDL2_LIBRARIES})

请注意，这些变量名称可能因您使用的SDL2版本而异。请查阅CMake模块文件或软件包配置文件本身，以获取已定义SDL2_*变量名称列表。

- Kevin