re PR c++/44619 (Bogus set but not used warning when using pointer to member operators)

	PR c++/44619
	* typeck2.c (build_m_component_ref): Call mark_lvalue_use on
	datum and mark_rvalue_use on component.

	* g++.dg/warn/Wunused-var-13.C: New test.

From-SVN: r161230

gcc/cp/ChangeLog

 2010-06-22  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/44619
+	* typeck2.c (build_m_component_ref): Call mark_lvalue_use on
+	datum and mark_rvalue_use on component.
+
 	PR c++/44627
 	* error.c (dump_expr): Don't look at CALL_EXPR_ARG (t, 0) if
 	the CALL_EXPR has no arguments.

gcc/cp/typeck2.c

@@ -1478,6 +1478,9 @@ build_m_component_ref (tree datum, tree component)
   if (error_operand_p (datum) || error_operand_p (component))
     return error_mark_node;
 
+  mark_lvalue_use (datum);
+  mark_rvalue_use (component);
+
   ptrmem_type = TREE_TYPE (component);
   if (!TYPE_PTR_TO_MEMBER_P (ptrmem_type))
     {

gcc/testsuite/ChangeLog

 2010-06-22  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/44619
+	* g++.dg/warn/Wunused-var-13.C: New test.
+
 	PR c++/44627
 	* g++.dg/diagnostic/method1.C: New test.
 

gcc/testsuite/g++.dg/warn/Wunused-var-13.C

+// PR c++/44619
+// { dg-do compile }
+// { dg-options "-Wunused -W" }
+
+struct S { int x, y; };
+
+int
+f1 ()
+{
+  struct S p;
+  int S::*q = &S::x;
+  p.*q = 5;
+  return p.*q;
+}
+
+int
+f2 (struct S *p, int S::*q)
+{
+  struct S *r = p;
+  int S::*s = q;
+  return r->*s;
+}