C++ PATCH for c++/65558 (ICE with abi_tag on anon namespace)

[Marek Polacek]

As discussed in the PR, the abi_tag on an anonymous namespace is useless,
but we shouldn't ICE if the user attempts to do that.

Bootstrapped/regtested on x86_64-linux, ok for trunk?

2015-03-25  Marek Polacek  <pola...@redhat.com>

        PR c++/65558
        * name-lookup.c (handle_namespace_attrs): Ignore abi_tag attribute
        on an anonymous namespace.

        * g++.dg/cpp0x/pr65558.C: New test.

diff --git gcc/cp/name-lookup.c gcc/cp/name-lookup.c
index b85fbc9..4303ed5 100644
--- gcc/cp/name-lookup.c
+++ gcc/cp/name-lookup.c
@@ -3663,6 +3663,12 @@ handle_namespace_attrs (tree ns, tree attributes)
                       "namespace", name);
              continue;
            }
+         if (!DECL_NAME (ns))
+           {
+             warning (OPT_Wattributes, "ignoring %qD attribute on anonymous "
+                      "namespace", name);
+             continue;
+           }
          if (!args)
            {
              tree dn = DECL_NAME (ns);
diff --git gcc/testsuite/g++.dg/cpp0x/pr65558.C 
gcc/testsuite/g++.dg/cpp0x/pr65558.C
index e69de29..5437e50 100644
--- gcc/testsuite/g++.dg/cpp0x/pr65558.C
+++ gcc/testsuite/g++.dg/cpp0x/pr65558.C
@@ -0,0 +1,6 @@
+// PR c++/65558
+// { dg-do compile { target c++11 } }
+
+inline namespace __attribute__((__abi_tag__))
+{ // { dg-warning "ignoring .__abi_tag__. attribute on anonymous namespace" }
+}

        Marek