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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
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.
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