| 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 |
| 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. |
