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Using as

2.15 Control Warnings: `-W', `--warn', `--no-warn', `--fatal-warnings'

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.