I do this to avoid using CMAKE_CURRENT_LIST_DIR in projects that must
still work with older CMake versions:
get_filename_component(_self_dir ${CMAKE_CURRENT_LIST_FILE} PATH)
After that call, the variable "_self_dir" has equivalent content to the
present-day CMAKE_CURRENT_LIST_DIR.
CMAKE_CURRENT_LIST_FILE has been around for much longer.
HTH,
David C.
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