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The ``relenv toolchain`` command.
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Setup the subparser for the ``toolchain`` command.
:param subparsers: The subparsers object returned from ``add_subparsers``
:type subparsers: argparse._SubParsersAction
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Fetch a toolchain and extract it to the filesystem.
:param arch: The architecture of the toolchain
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:param toolchain: Where to extract the toolchain
:type toolchain: str
:param clean: If true, clean the toolchain directories first
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Configure crosstool-ng.
:param ctngdir: The directory holding crosstool-ng
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:param dirs: The working directories
:type dirs: ``relenv.common.WorkDirs``
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Build a toolchaing for the given arch.
:param arch: The architecture to build for
:type arch: str
:param dirs: The working directories
:type dirs: ``relenv.common.WorkDirs``
:param machine: The machine to build for
:type machine: str
:param ctngdir: The directory holding crosstool-ng
:type ctngdir: ``pathlib.Path``
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The entrypoint into the ``relenv toolchain`` command.
:param args: The arguments for the command
:type args: ``argparse.Namespace``
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