CMAKE_<LANG>_SIZEOF_DATA_PTR
Size of pointer-to-data types for language <LANG>.
This holds the size (in bytes) of pointer-to-data types in the target platform ABI. It is defined for languages C and CXX (C++).
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https://cmake.org/cmake/help/v3.9/variable/CMAKE_LANG_SIZEOF_DATA_PTR.html