[Bug c++/51214] New: [C++11] name lookup issue with c++11 enums

[fabien at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51214

             Bug #: 51214
           Summary: [C++11] name lookup issue with c++11 enums
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: fabien@gcc.gnu.org


Noticed while working on PR c++/51188, I have launched the c++ testsuite with
the patch below:
Index: class.c
===================================================================
--- class.c    (revision 181491)
+++ class.c    (working copy)
@@ -6007,7 +6007,7 @@ finish_struct_1 (tree t)
      hierarchy), and we want this failure to occur quickly.  */

   n_fields = count_fields (TYPE_FIELDS (t));
-  if (n_fields > 7)
+  if (n_fields > 0)

And it has raised two errors related to c++11 enums: forw_enum5.C and
forw_enum9.C. Thus, here is a reproducer, comming from forw_enum5.C:

// { dg-do compile }
// { dg-options "-std=c++0x" }

namespace one
{
    struct S
    {
        enum { A = 1, B = 2 };
        struct T
        {
        int i1, i2, i3, i4, i5, i6, i7;

            enum { B = 102 };

            enum class E1;
            enum E2 : int;
        };
    };

    static_assert(int(S::T::A1) == 1, "error");
    static_assert(int(S::T::B1) == 102, "error");
    static_assert(int(S::T::C1) == 103, "error");
}

The following errors are issued:

error: 'A1' is not a member of 'one::S::T'

error: 'B1' is not a member of 'one::S::T'

error: 'C1' is not a member of 'one::S::T'


Most likely an issue in the sorted case of lookup_field_1. Mine.