Cmake variables are not translated to parent scope with add_subdirectory

[ClausKlein]

Some of the used CMake variable are not exported to parent scope.

It is not clear to me how this works, if it works right?
The exported packages are not checked so the result is undefined!

see https://github.com/ClausKlein/cpp_cmake_project/runs/6308595865?check_suite_focus=true#step:6:81
and ClausKlein/cpp_cmake_project@5085bd4

[aminya]

These are local variables. They are not exported.

[ClausKlein]

but they are use at package_project() and not defined at this scope!

[ClausKlein]

see too ClausKlein/cpp_cmake_project@bbe0fd6#diff-214006f43fd1197bb996e5f778e53bbcba05006d1286804b81dbef47c4bd9b44L12

[ClausKlein]

IMHO some of the CMake settings are magic (or obscure)
see https://github.com/ClausKlein/cpp_cmake_project/pull/1/files

[aminya]

I was wrong about add_subdirectory. The variables are not passed to the parent scope.