无论我怎么尝试，CMake 都找不到 SDL2

Question

注意这不是编译时问题，这是 cmake 生成时问题。

我一直在尝试设置我的环境，以便 cmake 可以找到 SDL2。

我在 Windows 11 上，将最新版本的 SDL2（在这里）、SDL_image（在这里）和 SDL_ttf（在这里）下载到文件夹

c:\DEVLIBS\

。我为此使用了各自的 mingw 拉链。

但是无论我尝试什么，如果它不是找到 SDL2 的问题，那么无论我尝试什么，它都永远找不到 SDL2_image 或 SDL2_ttf。

我尝试使用

find_package(SDL2 REQUIRED)

和

find_package(SDL2_image REQUIRED)

等，

然后

find_package(SDL2 REQUIRED PATHS "c:\DEVLIBS\")

和

find_package(SDL2_image REQUIRED PATHS "c:\DEVLIBS\SDL_image")

,

然后其他一些组合改变路径或添加提示以防万一，

然后我决定尝试 https://gitlab.com/aminosbh/sdl2-cmake-modules.git

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${SDL_FIND_MODULE_PATH})

和

find_package(SDL2 REQUIRED)

和

find_package(SDL2_image REQUIRED)

等

我还尝试修改所有涉及的路径，看看是否给它一个特定文件的列表或目录会修复它，但并没有这样做。

虽然这些都不适用于 SDL2_image 或 SDL2_ttf，但最后一个至少适用于 SDL2。 最后一个也给了我一个错误

1> [CMake]   By not providing "FindSDL2_image.cmake" in CMAKE_MODULE_PATH this project
1> [CMake]   has asked CMake to find a package configuration file provided by
1> [CMake]   "SDL2_image", but CMake did not find one.
1> [CMake] 
1> [CMake]   Could not find a package configuration file provided by "SDL2_image" with
1> [CMake]   any of the following names:
1> [CMake] 
1> [CMake]     SDL2_imageConfig.cmake
1> [CMake]     sdl2_image-config.cmake
1> [CMake] 
1> [CMake]   Add the installation prefix of "SDL2_image" to CMAKE_PREFIX_PATH or set
1> [CMake]   "SDL2_image_DIR" to a directory containing one of the above files.  If
1> [CMake]   "SDL2_image" provides a separate development package or SDK, be sure it has
1> [CMake]   been installed.

坦率地说，我不知道为什么这不起作用。我什至检查了

CMAKE_MODULE_PATH

，即使它具有一次所需的

FindSDL2*.cmake

文件的所有可能路径组合，它也拒绝工作，甚至尝试从我的

/cmake

文件夹中的每个SDL文件夹添加

c:/DEVLIBS/

目录。我已经通过

message("${CMAKE_MODULE_PATH}")

女巫证明了这一点。

更新：我目前已经走到这一步（可以找到 SDL，但是 SDL_image 和 SDL_ttf 不能）

set(SDL_FIND_MODULE_PATH "cmake/sdl2-cmake-modules" CACHE PATH "")
set(SDL2_PATH "mysdlpath" CACHE PATH "")
set(SDL2_ttf_PATH "mysdlttfpath" CACHE PATH "")
set(SDL2_image_PATH "mysdlimagepath" CACHE PATH "")

get_filename_component(SDL_FIND_MODULE_PATH ${SDL_FIND_MODULE_PATH} ABSOLUTE)

list(APPEND CMAKE_MODULE_PATH ${SDL_FIND_MODULE_PATH})
message("${CMAKE_MODULE_PATH}")
list(APPEND CMAKE_PREFIX_PATH ${SDL2_PATH} ${SDL2_ttf_PATH} ${SDL2_image_PATH})

project ("sdlcmaketest" LANGUAGES C)

    #locate sdl and set its variables
    find_package(SDL2 REQUIRED)
    find_package(SDL2_ttf REQUIRED)
    find_package(SDL2_image REQUIRED)
    message("!!! SDL LIBS FOUND !!! ${SDL2_image_LIBRARIES} ${SDL2_ttf_LIBRARIES} ${SDL2_LIBRARIES}")

    if (NOT SDL2_image_FOUND OR NOT SDL2_ttf_FOUND OR NOT SDL2_FOUND)
        message("Uhoh")
    endif()

    #main executable
    add_executable (${PROJECT_NAME} "main.c" "main.h")
    
        #target_include_directories(${PROJECT_NAME} PUBLIC ${SDL2_INCLUDE_DIRS} ${SDL2_ttf_INCLUDE_DIRS} ${SDL2_image_INCLUDE_DIRS})
        target_include_directories(${PROJECT_NAME} PUBLIC "lib/")
        target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES})
        target_link_libraries(${PROJECT_NAME} ${SDL2_image_LIBRARIES})
        target_link_libraries(${PROJECT_NAME} ${SDL2_ttf_LIBRARIES})