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[Bug c/65403] New: -Wno-error=<not implemented> is an error


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65403

            Bug ID: 65403
           Summary: -Wno-error=<not implemented> is an error
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: enhancement
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org

If you want to silence warnings you can use -Wno-XXX without caring about
whether
a compiler implements -WXXX already.  This doesn't seem to work with
-Wno-error=XXX which errors on unknown XXX.

It seems to me that we should treat -W[no-]error=XXX the same as -Wno-XXX
for unknown XXX as it certainly will enable/disable errors for the warning XXX
both if present or not present (no warnings anyway).

> gcc-5 -Wall -Werror -Wno-error=logical-not-parentheses -S t.c
> gcc-4.8 -Wall -Werror -Wno-error=logical-not-parentheses -S t.c
cc1: error: -Werror=logical-not-parentheses: no option
-Wlogical-not-parentheses

> gcc-5 -Wno-error=foo -S t.c
cc1: error: -Werror=foo: no option -Wfoo


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