cmake - 使用 cmake 时 find_package() 函数的默认搜索路径是什么？

Question

我也想知道 find_package(<package>) 时设置的默认变量发现 <package>在 Linux (Ubuntu) 中？

Answer 1

把我的评论变成答案

如果您必须将其分解为“最重要的单一”路径，它将是 CMake's own module path含预装Find...模块。

将 CMake 指向自定义路径的最重要的全局变量是 CMAKE_MODULE_PATH .

如果您想查看 CMake 在您的情况下搜索哪些目录，只需调用

 cmake -D CMAKE_FIND_DEBUG_MODE=ON ..

整个“搜索算法”记录在 find_package() command documentation 中:

1. Search paths specified in cmake-specific cache variables. This can be skipped if NO_CMAKE_PATH is passed:

   CMAKE_PREFIX_PATH
   CMAKE_FRAMEWORK_PATH
   CMAKE_APPBUNDLE_PATH
   

2. Search paths specified in cmake-specific environment variables. This can be skipped if NO_CMAKE_ENVIRONMENT_PATH is passed:

   <package>_DIR
   CMAKE_PREFIX_PATH
   CMAKE_FRAMEWORK_PATH
   CMAKE_APPBUNDLE_PATH
   

3. Search paths specified by the HINTS option. Hard-coded guesses should be specified with the PATHS option.

4. Search the standard system environment variables. This can be skipped if NO_SYSTEM_ENVIRONMENT_PATH is passed:

   PATH
   

5. Search paths stored in the CMake User Package Registry. This can be skipped if NO_CMAKE_PACKAGE_REGISTRY is passed or by setting the CMAKE_FIND_PACKAGE_NO_PACKAGE_REGISTRY to TRUE.

6. Search cmake variables defined in the Platform files for the current system. This can be skipped if NO_CMAKE_SYSTEM_PATH is passed:

   CMAKE_SYSTEM_PREFIX_PATH
   CMAKE_SYSTEM_FRAMEWORK_PATH
   CMAKE_SYSTEM_APPBUNDLE_PATH
   

7. Search paths stored in the CMake System Package Registry. This can be skipped if NO_CMAKE_SYSTEM_PACKAGE_REGISTRY is passed or by setting the CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY to TRUE.

8. Search paths specified by the PATHS option. These are typically hard-coded guesses.