[Bug c/37648] New: Incorrect warning "flag ignored with precision" in printf

[ciobi at inbox dot com]

Consider this program:

-------------- a.c --------------------
#include <stdio.h>

int main()
{
    int a = 10;
    printf("%d\n", a);
    printf("%0.4d\n", a);
    return 0;
}

---------------------------------------

By compiling with:
    gcc -Wall a.c
This warning gets displayed:
    a.c:7: warning: '0' flag ignored with precision and ‘%d’ printf format

The '0' flag isn't actually ignored, and it shouldn't be anyway, so I think the
warning is incorrect.

==============================

More details:

I found this on 4.2.1, but I also tried it on 4.1.0 and 4.3.1, and the result
is the same.

Both gcc and g++ show the warning (initially I found this in a C++ project and
then I checked to see if C code exhibits the same issue).


-- 
           Summary: Incorrect warning "flag ignored with precision" in
                    printf
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ciobi at inbox dot com
 GCC build triplet: x86_64-suse-linux
  GCC host triplet: x86_64-suse-linux
GCC target triplet: x86_64-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37648