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warnings
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warnings_general.rst_
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``-W`` Turn on all warnings. ``-Werror`` Turn warnings into errors. Note that this option alone doesn't turn on any warnings; it only affects those warnings that have been turned on so far or will be turned on later. ``-W<warning>`` Turn on ``warning``. ``-Wno-<warning>`` Turn off ``warning``. ``-Werror-<warning>`` Turn on ``warning`` and treat it as an error (this implies ``-W<warning>``). ``-Wno-error-<warning>`` Don't treat this particular ``warning`` as an error. This doesn't turn off the warning itself.