问题
The accepted answer of this question correctly states that cmake does not handle C++ header-files build dependencies in case cmake's build directory is under cmake's PROJECT_SOURCE_DIR. PROJECT_SOURCE_DIR is assigned its value when the cmake project() macro is used, therefore it would be the "top" directory for such a project structure using project(source):
top
|
|--CmakeLists.txt
|--source
|--build
As far as I know, this is the typical structure of a cmake project, so I find it surprising that cmake does not handle this structure. Instead, such a structure would be required in order to handle the header file build dependencies correctly:
top
|
|--source
|--CMakeLists.txt
|--build
Is this the expected behavior of cmake? Or is it a bug which should be reported?
来源：https://stackoverflow.com/questions/59949212/cmake-not-handling-header-files-build-dependencies-if-build-dir-is-a-subdirector