PR c++/82461 - constexpr list-initialized member

	* constexpr.c (potential_constant_expression_1): Check
	TARGET_EXPR_DIRECT_INIT_P.

From-SVN: r256860

gcc/cp/ChangeLog

+2018-01-18  Jason Merrill  <jason@redhat.com>
+
+	PR c++/82461 - constexpr list-initialized member
+	* constexpr.c (potential_constant_expression_1): Check
+	TARGET_EXPR_DIRECT_INIT_P.
+
 2018-01-18  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/81013

gcc/cp/constexpr.c

@@ -5726,7 +5726,8 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict, bool now,
       return RECUR (TREE_OPERAND (t, 1), want_rval);
 
     case TARGET_EXPR:
-      if (!literal_type_p (TREE_TYPE (t)))
+      if (!TARGET_EXPR_DIRECT_INIT_P (t)
+	  && !literal_type_p (TREE_TYPE (t)))
 	{
 	  if (flags & tf_error)
 	    {

gcc/testsuite/g++.dg/cpp0x/constexpr-list2.C

+// PR c++/82461
+// { dg-do compile { target c++11 } }
+
+class A {
+private:
+public:
+  constexpr A() {}
+  ~A() {}
+};
+
+class B {
+private:
+  A  a;
+public:
+  constexpr B() : a{} {}
+// works
+// constexpr B() : a() {}
+
+  ~B() {}
+};