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