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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65040] [5 Regression] gcc-5 -Wformat broken
Date: Tue, 24 Feb 2015 09:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65040

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
#include <stdio.h>
int main()
{
  printf ("%x%u\n", 4, 4);
}
> gcc-5 -Wall t.c -Wformat=2
t.c: In function 'main':
t.c:4:11: warning: format '%x' expects argument of type 'unsigned int', but
argument 2 has type 'int' [-Wformat=]
   printf ("%x%u\n", 4, 4);
           ^
t.c:4:11: warning: format '%u' expects argument of type 'unsigned int', but
argument 3 has type 'int' [-Wformat=]

that's undesirable as well (the constant fits in an unsigned int).