[Bug c/21911] New: named parameter mistakenly identified as sentinel

["ghazi at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

GCC mistakenly identifies a named parameter as a sentinel.  Given the following 
program, compiling with -Wformat GCC should warn about a missing sentinel on 
the line indicated:

#include <stddef.h>

extern void foo (const char *, ...) __attribute__ ((__sentinel__));

void bar (void)
{
  foo (NULL); /* missing warning!! */
  foo ("hello", NULL); /* clean */
}

When looking for the sentinel, GCC should skip over the named arguments first 
before attempting to locate the NULL pointer.

-- 
           Summary: named parameter mistakenly identified as sentinel
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ghazi at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21911