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2.14 Suppress Warnings: -W

as should never give a warning or error message when assembling compiler output. But programs written by people often cause as to give a warning that a particular assumption was made. All such warnings are directed to the standard error file. If you use this option, no warnings are issued. This option only affects the warning messages: it does not change any particular of how as assembles your file. Errors, which stop the assembly, are still reported.