re PR c++/86063 (g++ ICE at tree check: expected tree_list, have…

re PR c++/86063 (g++ ICE at  tree check: expected tree_list, have expr_pack_expansion in cp_check_const_attributes, at cp/decl2.c:1391)

	PR c++/86063
	* decl2.c (cp_check_const_attributes): Skip trees that are not
	TREE_LISTs.

	* g++.dg/cpp0x/gen-attrs-65.C: New test.

From-SVN: r261613

gcc/cp/ChangeLog

+2018-06-14  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86063
+	* decl2.c (cp_check_const_attributes): Skip trees that are not
+	TREE_LISTs.
+
 2018-06-14  Jakub Jelinek  <jakub@redhat.com>
 
 	P0624R2 - Default constructible and assignable stateless lambdas

gcc/cp/decl2.c

@@ -1387,7 +1387,8 @@ cp_check_const_attributes (tree attributes)
   for (attr = attributes; attr; attr = TREE_CHAIN (attr))
     {
       tree arg;
-      for (arg = TREE_VALUE (attr); arg; arg = TREE_CHAIN (arg))
+      for (arg = TREE_VALUE (attr); arg && TREE_CODE (arg) == TREE_LIST;
+	   arg = TREE_CHAIN (arg))
 	{
 	  tree expr = TREE_VALUE (arg);
 	  if (EXPR_P (expr))

gcc/testsuite/ChangeLog

+2018-06-14  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/86063
+	* g++.dg/cpp0x/gen-attrs-65.C: New test.
+
 2018-06-14  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/86048

gcc/testsuite/g++.dg/cpp0x/gen-attrs-65.C

+// PR c++/86063
+// { dg-do compile { target c++11 } }
+
+template <class... T>
+struct S {
+  [[foobar(alignof(T))...]] char t; // { dg-warning "attribute directive ignored" }
+};