CMAKE_PARENT_LIST_FILE
Full path to the CMake file that included the current one.
While processing a CMake file loaded by include() or find_package() this variable contains the full path to the file including it. The top of the include stack is always the CMakeLists.txt for the current directory. See also CMAKE_CURRENT_LIST_FILE.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/CMAKE_PARENT_LIST_FILE.html