1CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN
2----------------------------------------
3
4The external toolchain for cross-compiling, if supported.
5
6Some compiler toolchains do not ship their own auxiliary utilities such as
7archivers and linkers.  The compiler driver may support a command-line argument
8to specify the location of such tools.
9``CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN`` may be set to a path to
10the external toolchain and will be passed to the compiler driver if supported.
11
12This variable may only be set in a toolchain file specified by
13the :variable:`CMAKE_TOOLCHAIN_FILE` variable.
14