The target for cross-compiling, if supported.
Some compiler drivers are inherently cross-compilers, such as clang and QNX qcc. These compiler drivers support a command-line argument to specify the target to cross-compile for.
This variable may only be set in a toolchain file specified by the CMAKE_TOOLCHAIN_FILE variable.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_LANG_COMPILER_TARGET.html