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The final set of compile or link options used for a target is constructed by
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accumulating options from the current target and the usage requirements of
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its dependencies. The set of options is de-duplicated to avoid repetition.
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While beneficial for individual options, the de-duplication step can break
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up option groups. For example, ``-D A -D B`` becomes ``-D A B``. One may
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specify a group of options using shell-like quoting along with a ``SHELL:``
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prefix. The ``SHELL:`` prefix is dropped, and the rest of the option string
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is parsed using the :command:`separate_arguments` ``UNIX_COMMAND`` mode.
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For example, ``"SHELL:-D A" "SHELL:-D B"`` becomes ``-D A -D B``.
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