[Bug c/105499] inconsistency between -Werror=c++-compat and g++ in __extension__ block

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105499

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |c
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-10-31
     Ever confirmed|0                           |1

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed reduced testcase:
void f (void *q)
{
  __extension__ int *p1 = q;
}

At first I thought it was an issue with the statement expression but nope, it
is just __extension__ vs -Wc++-compat .