[Bug c/35980] The canonical type of types with may_alias attribute is incorrect

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=35980

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, we used to warn (error out for -pedantic-errors) for:
  typedef int __attribute__((may_alias)) mytype;
  mytype a;
  int *p = &a;

But starting in GCC 7, we no longer do.