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+CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN
+----------------------------------------
+
+The external toolchain for cross-compiling, if supported.
+
+Some compiler toolchains do not ship their own auxiliary utilities such as
+archivers and linkers. The compiler driver may support a command-line argument
+to specify the location of such tools.
+``CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN`` may be set to a path to a path to
+the external toolchain and will be passed to the compiler driver if supported.
+
+This variable may only be set in a toolchain file specified by
+the :variable:`CMAKE_TOOLCHAIN_FILE` variable.