C++ PATCH for c++/66748 (ICE with abi_tag on enum)

[Marek Polacek]

The following testcase was breaking because we we're trying to
access TYPE_LANG_SPECIFIC via CLASSTYPE_TEMPLATE_* macros without
first checking that we indeed have a CLASS_TYPE.

Bootstrapped/regtested on x86_64-linux, ok for trunk/5/4.9?

2015-07-03  Marek Polacek  <pola...@redhat.com>

        PR c++/66748
        * tree.c (handle_abi_tag_attribute): Check for CLASS_TYPE_P before
        accessing TYPE_LANG_SPECIFIC node.

        * g++.dg/abi/abi-tag15.C: New test.

diff --git gcc/cp/tree.c gcc/cp/tree.c
index 0d1112c..22d5b3a 100644
--- gcc/cp/tree.c
+++ gcc/cp/tree.c
@@ -3654,13 +3654,15 @@ handle_abi_tag_attribute (tree* node, tree name, tree 
args,
                 name, *node);
          goto fail;
        }
-      else if (CLASSTYPE_TEMPLATE_INSTANTIATION (*node))
+      else if (CLASS_TYPE_P (*node)
+              && CLASSTYPE_TEMPLATE_INSTANTIATION (*node))
        {
          warning (OPT_Wattributes, "ignoring %qE attribute applied to "
                   "template instantiation %qT", name, *node);
          goto fail;
        }
-      else if (CLASSTYPE_TEMPLATE_SPECIALIZATION (*node))
+      else if (CLASS_TYPE_P (*node)
+              && CLASSTYPE_TEMPLATE_SPECIALIZATION (*node))
        {
          warning (OPT_Wattributes, "ignoring %qE attribute applied to "
                   "template specialization %qT", name, *node);
diff --git gcc/testsuite/g++.dg/abi/abi-tag15.C 
gcc/testsuite/g++.dg/abi/abi-tag15.C
index e69de29..bfda3a2 100644
--- gcc/testsuite/g++.dg/abi/abi-tag15.C
+++ gcc/testsuite/g++.dg/abi/abi-tag15.C
@@ -0,0 +1,3 @@
+// PR c++/66748
+
+enum __attribute__((abi_tag("foo"))) E {}; // { dg-error "redeclaration of" }

        Marek