re PR c++/84449 (ICE with constexpr and deleted destructor)

	PR c++/84449
	* tree.c (bot_manip): If build_cplus_new or break_out_target_exprs
	returns error_mark_node, return it immediately.
	(break_out_target_exprs): If cp_walk_tree with bot_manip returns
	error_mark_node, return error_mark_node.

	* g++.dg/cpp0x/constexpr-84449.C: New test.

From-SVN: r257839

gcc/cp/ChangeLog

 2018-02-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/84449
+	* tree.c (bot_manip): If build_cplus_new or break_out_target_exprs
+	returns error_mark_node, return it immediately.
+	(break_out_target_exprs): If cp_walk_tree with bot_manip returns
+	error_mark_node, return error_mark_node.
+
 	PR c++/84455
 	* pt.c (tsubst_lambda_expr): If not nested, increment temporarily
 	function_depth to avoid GC during finish_lambda_function.

gcc/cp/tree.c

@@ -2896,6 +2896,8 @@ bot_manip (tree* tp, int* walk_subtrees, void* data)
 	{
 	  u = build_cplus_new (TREE_TYPE (t), TREE_OPERAND (t, 1),
 			       tf_warning_or_error);
+	  if (u == error_mark_node)
+	    return u;
 	  if (AGGR_INIT_ZERO_FIRST (TREE_OPERAND (t, 1)))
 	    AGGR_INIT_ZERO_FIRST (TREE_OPERAND (u, 1)) = true;
 	}
@@ -2913,6 +2915,8 @@ bot_manip (tree* tp, int* walk_subtrees, void* data)
 			 (splay_tree_value) TREE_OPERAND (u, 0));
 
       TREE_OPERAND (u, 1) = break_out_target_exprs (TREE_OPERAND (u, 1));
+      if (TREE_OPERAND (u, 1) == error_mark_node)
+	return error_mark_node;
 
       /* Replace the old expression with the new version.  */
       *tp = u;
@@ -3025,7 +3029,8 @@ break_out_target_exprs (tree t)
     target_remap = splay_tree_new (splay_tree_compare_pointers,
 				   /*splay_tree_delete_key_fn=*/NULL,
 				   /*splay_tree_delete_value_fn=*/NULL);
-  cp_walk_tree (&t, bot_manip, target_remap, NULL);
+  if (cp_walk_tree (&t, bot_manip, target_remap, NULL) == error_mark_node)
+    t = error_mark_node;
   cp_walk_tree (&t, bot_replace, target_remap, NULL);
 
   if (!--target_remap_count)

gcc/testsuite/ChangeLog

 2018-02-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/84449
+	* g++.dg/cpp0x/constexpr-84449.C: New test.
+
 	PR c++/84455
 	* g++.dg/cpp0x/lambda/lambda-ice26.C: New test.
 

gcc/testsuite/g++.dg/cpp0x/constexpr-84449.C

+// PR c++/84449
+// { dg-do compile { target c++11 } }
+
+struct A
+{
+  constexpr A (int) {}
+  ~A () = delete;
+};
+
+struct B
+{
+  A a;
+  constexpr B () : a (0) {}	// { dg-error "use of deleted function" }
+};