Disallowed since version 3.0. See CMake Policy CMP0036.
Use ${CMAKE_SYSTEM} and ${CMAKE_CXX_COMPILER} instead.
build_name(variable)
Sets the specified variable to a string representing the platform and compiler settings. These values are now available through the CMAKE_SYSTEM and CMAKE_CXX_COMPILER variables.
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https://cmake.org/cmake/help/v3.19/command/build_name.html