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/CMake 3.19

CMAKE_SIZEOF_VOID_P

Size of a void pointer.

This is set to the size of a pointer on the target machine, and is determined by a try compile. If a 64-bit size is found, then the library search path is modified to look for 64-bit libraries first.

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https://cmake.org/cmake/help/v3.19/variable/CMAKE_SIZEOF_VOID_P.html