CMAKE_<LANG>_LIBRARY_ARCHITECTURE

Target architecture library directory name detected for <LANG>.

If the <LANG> compiler passes to the linker an architecture-specific system library search directory such as <prefix>/lib/<arch> this variable contains the <arch> name if/as detected by CMake.

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https://cmake.org/cmake/help/v3.15/variable/CMAKE_LANG_LIBRARY_ARCHITECTURE.html