CMAKE_<LANG>_ANDROID_TOOLCHAIN_PREFIX

When Cross Compiling for Android this variable contains the absolute path prefixing the toolchain GNU compiler and its binutils.

See also CMAKE_<LANG>_ANDROID_TOOLCHAIN_SUFFIX and CMAKE_<LANG>_ANDROID_TOOLCHAIN_MACHINE.

For example, the path to the linker is:

${CMAKE_CXX_ANDROID_TOOLCHAIN_PREFIX}ld${CMAKE_CXX_ANDROID_TOOLCHAIN_SUFFIX}

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https://cmake.org/cmake/help/v3.9/variable/CMAKE_LANG_ANDROID_TOOLCHAIN_PREFIX.html