PR c++/83835 - C++17 error with constructor ctors.

	* call.c (build_special_member_call): Set TARGET_EXPR_DIRECT_INIT_P.

From-SVN: r257757

gcc/cp/ChangeLog

 2018-02-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/83835 - C++17 error with constructor ctors.
+	* call.c (build_special_member_call): Set TARGET_EXPR_DIRECT_INIT_P.
+
 	PR c++/82664 - ICE with reference to function template parm.
 	* pt.c (convert_nontype_argument_function): Avoid obfuscationg
 	NOP_EXPRs.

gcc/cp/call.c

@@ -8834,6 +8834,9 @@ build_special_member_call (tree instance, tree name, vec<tree, va_gc> **args,
 	{
 	  if (is_dummy_object (instance))
 	    return arg;
+	  else if (TREE_CODE (arg) == TARGET_EXPR)
+	    TARGET_EXPR_DIRECT_INIT_P (arg) = true;
+
 	  if ((complain & tf_error)
 	      && (flags & LOOKUP_DELEGATING_CONS))
 	    check_self_delegation (arg);

gcc/testsuite/g++.dg/cpp0x/constexpr-ctor21.C

+// PR c++/83835
+// { dg-do compile { target c++11 } }
+
+struct Z
+{
+  void const * p_;
+  constexpr Z( void const * p ): p_( p ) {}
+  ~Z();
+};
+
+struct Y
+{
+  Z z_;
+  constexpr Y() noexcept: z_( this ) {}
+};