[Bug c/56048] New: -Werror=format=2 does not work

[Bug c/56048] New: -Werror=format=2 does not work

[hdante at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56048

             Bug #: 56048
           Summary: -Werror=format=2 does not work
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hdante@gmail.com


Created attachment 29222
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29222
format-warning.c

format-warning.c:
#include <stdio.h>

int main(void)
{
    const char *s = "%s\n";
    printf(s, "abcd");
    return 0;
}

$ gcc -Wall -Werror -Werror=format=2 -o format-warning format-warning.c (no
error)

$ gcc -Wall -Werror -Werror=format -Werror=format-nonliteral
-Werror=format-security -Werror=format-y2k -o format-warning format-warning.c 
format-warning.c: Na função ‘main’:
format-warning.c:6:2: error: format not a string literal, argument types not
checked [-Werror=format-nonliteral]

[Bug c/56048] -Werror=format=2 does not work

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56048

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2013-01-21 11:26:52 UTC ---
I think this may be fixed in GCC 4.8, but I don't have a recently build GCC at
hand to test it.

[Bug c/56048] -Werror=format=2 does not work

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56048

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-01-21
     Ever Confirmed|0                           |1

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2013-01-21 12:31:54 UTC ---
(In reply to comment #1)
> I think this may be fixed in GCC 4.8, but I don't have a recently build GCC at
> hand to test it.

Actually, it is not. opts.c:control_warning_as_error doesn't handle options
with joined arguments, the argument is ignored. Extra code would need to be
added to check that the option is joined, that it has an argument, read the
argument and pass the correct value to control_warning. Then, it should work.