[Bug c/55746] vfprintf behaves differently variable on stack vs const argument.

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55746

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-12-19 23:44:14 UTC ---
And this is not a bug really.  GCC is optimizing the first one to fwrite but
not the second one since it does not see the constant string in the first case.
 Also this code is undefined as the varargs that you passed to vfprintf is not
a real one.