PR c++/68983 (FE)

	PR c++/67557
	* call.c (unsafe_copy_elision_p): Look through COMPOUND_EXPR.

From-SVN: r232166

gcc/cp/ChangeLog

+2016-01-08  Jason Merrill  <jason@redhat.com>
+
+	PR c++/68983
+	PR c++/67557
+	* call.c (unsafe_copy_elision_p): Look through COMPOUND_EXPR.
+
 2016-01-05  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/58583

gcc/cp/call.c

@@ -7161,6 +7161,9 @@ unsafe_copy_elision_p (tree target, tree exp)
       && resolves_to_fixed_type_p (target, NULL))
     return false;
   tree init = TARGET_EXPR_INITIAL (exp);
+  /* build_compound_expr pushes COMPOUND_EXPR inside TARGET_EXPR.  */
+  while (TREE_CODE (init) == COMPOUND_EXPR)
+    init = TREE_OPERAND (init, 1);
   return (TREE_CODE (init) == AGGR_INIT_EXPR
 	  && !AGGR_INIT_VIA_CTOR_P (init));
 }

gcc/testsuite/g++.dg/init/elide4.C

+// PR c++/67557
+
+class A {
+public:
+  A m_fn1();
+  A(A const &);
+  int *L;
+  int ref;
+};
+struct B : A {
+  B();
+};
+B::B() : A((0, m_fn1())) {}