cmake - 如何检查cmake包含在 `include(...)`中的模块是否存在？

Question

在我的一个 CMakeLists.txt 文件中:

include( AICxxProject )

在某些情况下(错误安装)这会产生:

CMake Error at src/CMakeLists.txt:1 (include):  
  include could not find load file:  

    AICxxProject

我想告诉用户他们做错了什么以及如何解决带有 FATAL_ERROR 消息。但是，我如何检测模块是否像 AICxxProject 会在 include 之前被发现吗？

Answer 1

实际阅读include的文档解决了.

以下作品，

include( AICxxProject OPTIONAL RESULT_VARIABLE _module_path )                                                                                                            
if ( NOT _module_path )                                                                                                                                                  
  message( FATAL_ERROR                                                                                                                                                   
      "include could not find load file: AICxxProject\n"                                                                                                                 
      "1) Make sure that you have the git submodule https://github.com/CarloWood/cwm4 in the top-level directory.\n"                                                     
      "2) Use `include(cwm4/cmake/AICxxProject)` right below the `project(...)` command in your top-level CMakeLists.txt."                                               
  )                                                                                                                                                                      
endif ()                                                                                                                                                                 

作为输出

CMake Error at cwds/CMakeLists.txt:9 (message):
  include could not find load file: AICxxProject

  1) Make sure that you have the git submodule
  https://github.com/CarloWood/cwm4 in the top-level directory.

  2) Use `include(cwm4/cmake/AICxxProject)` right below the `project(...)`
  command in your top-level CMakeLists.txt.


-- Configuring incomplete, errors occurred!