https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66879
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Anders Granlund from comment #0)
> Note that if we remove the member function definition in the given program
> it compiles without errors.
I think that's the real bug. G++ should not accept this program:
class A;
namespace Y {
using ::A;
class A { };
}
int main()
{
Y::A a;
::A* p = &a;
}
Clang rejects it because Y::A in main() is ambiguous, but EDG rejects it with
the same error as for the original testcase:
"a.cc", line 5: error: class "A" cannot be defined in the current scope
class A { };
^
I believe EDG is right to reject that class-specifier because the class name A
has already been introduced into that scope, and it cannot be a definition of
::A because it doesn't use a nested-name-specifier and it isn't in the
namespace (or an enclosing namespace) of ::A.
