CMAKE_PROJECT_INCLUDE_BEFORE

New in version 3.15.

A CMake language file or module to be included as the first step of all project() command calls. This is intended for injecting custom code into project builds without modifying their source. See Code Injection for a more detailed discussion of files potentially included during a project() call.

See also the CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE, CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE_BEFORE, CMAKE_PROJECT_INCLUDE, and CMAKE_PROJECT_TOP_LEVEL_INCLUDES variables.