https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66892

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Alias|                            |cwg355

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
testcase:

struct A;
struct ::A { };
namespace B {
  struct A;
}
struct ::B::A { };

Looks the error message was added with the new parser in GCC 3.4.0.

The fix might be easy but I have not tested it to see if there is any
regressions.
That is remove the following code from parser.c:
  /* Issue the error about the overly-qualified name now.  */
  if (qualified_p)
    {
      cp_parser_error (parser,
                       "global qualification of class name is invalid");
      type = error_mark_node;
      goto out;
    }
  else

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