[CMake] Querying CMake variables of external CMake projects

[Saad Khattak]

Hi,

Say I find LibA using find_package(LibA) and I now have access to LibA_DIR,
which is the build folder of LibA. Is there a way I can query additional
variables, such as LibA's source directory, install directory etc. i.e.
variables that are defined by CMake when LibA was being generated/built by
CMake?

Thanks,
Saad
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