11.10.4 Options that control warnings

-w

--inhibit-warnings

Disable all warning messages.

--inhibit-style-warnings

Disable all warning messages about programming style.

--warn-all-format-string-errors

If a format string has more one than mismatch with the supplied values, generate a warning for all mismatches, not just the first. (The default is to report only the first, because later mismatches may be avalanche errors caused by earlier mismatches.)

--no-warn-up-to-date

Do not warn if targets specified on the command line with mmc --make are already up-to-date.