CMake 检查主项目是否被调用

Question

我有这种项目目录设计:

Main:
    CMakeLists.txt
    subproject1:
         CMakeLists.txt   
    subproject2
         CMakeLists.txt   

如果 subproject1 cmake 是由 Main 项目调用的，或者作为独立项目调用，我如何检查 subproject1/CMakeLists.txt 文件？

Answer 1

干得好:

if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
# We are building as stand-alone project
project(subproject1)
...
else()
# We are building as part of Main project
endif()