CMAKE_<LANG>_ANDROID_TOOLCHAIN_MACHINE
When Cross Compiling for Android this variable contains the toolchain binutils machine name (e.g. gcc -dumpmachine). The binutils typically have a <machine>- prefix on their name.
See also CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX and CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX.
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https://cmake.org/cmake/help/v3.9/variable/CMAKE_LANG_ANDROID_TOOLCHAIN_MACHINE.html