re PR c++/71822 (ICE: in gimplify_expr, at gimplify.c:11025)

	PR c++/71822
	* cp-gimplify.c (cp_gimplify_expr) <case VEC_INIT_EXPR>: Recursively
	fold *expr_p before genericizing it.

	* g++.dg/template/defarg21.C: New test.

From-SVN: r238440

gcc/cp/ChangeLog

 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71822
+	* cp-gimplify.c (cp_gimplify_expr) <case VEC_INIT_EXPR>: Recursively
+	fold *expr_p before genericizing it.
+
 	PR c++/71871
 	* typeck.c (build_x_conditional_expr): Revert the 2012-10-25 change.
 

gcc/cp/cp-gimplify.c

@@ -621,6 +621,8 @@ cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
 				  init, VEC_INIT_EXPR_VALUE_INIT (*expr_p),
 				  from_array,
 				  tf_warning_or_error);
+	hash_set<tree> pset;
+	cp_walk_tree (expr_p, cp_fold_r, &pset, NULL);
 	cp_genericize_tree (expr_p);
 	ret = GS_OK;
 	input_location = loc;

gcc/testsuite/ChangeLog

 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71822
+	* g++.dg/template/defarg21.C: New test.
+
 	PR c++/71871
 	* g++.dg/ext/vector31.C: New test.
 

gcc/testsuite/g++.dg/template/defarg21.C

+// PR c++/71822
+// { dg-do compile }
+
+int bar (int);
+
+template <typename T>
+struct A
+{
+  explicit A (int x = bar (sizeof (T)));
+};
+
+struct B
+{
+  A <int> b[2];
+};
+
+void
+baz ()
+{
+  B b;
+}