| Controlling Warnings

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`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 the '-W' and '--no-warn' options, no warnings are issued. This 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.
If you use the '--fatal-warnings' option, `as` considers files that generate warnings to be in error.
You can switch these options off again by specifying '--warn', which causes warnings to be output as usual.