re PR c++/44412 (Another bogus set-but-not-used warning)

	PR c++/44412
	* typeck.c (build_class_member_access_expr): Call mark_exp_read
	on object for static data members.

	* g++.dg/warn/Wunused-var-10.C: New test.
	* g++.dg/warn/Wunused-var-11.C: New test.

From-SVN: r160290

gcc/cp/ChangeLog

 2010-06-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44412
+	* typeck.c (build_class_member_access_expr): Call mark_exp_read
+	on object for static data members.
+
+2010-06-04  Jakub Jelinek  <jakub@redhat.com>
 	    Jason Merrill  <jason@redhat.com>
 
 	PR c++/44362

gcc/cp/typeck.c

@@ -2229,6 +2229,7 @@ build_class_member_access_expr (tree object, tree member,
     {
       /* A static data member.  */
       result = member;
+      mark_exp_read (object);
       /* If OBJECT has side-effects, they are supposed to occur.  */
       if (TREE_SIDE_EFFECTS (object))
 	result = build2 (COMPOUND_EXPR, TREE_TYPE (result), object, result);

gcc/testsuite/ChangeLog

 2010-06-04  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/44412
+	* g++.dg/warn/Wunused-var-10.C: New test.
+	* g++.dg/warn/Wunused-var-11.C: New test.
+
 	PR c++/44362
 	* c-c++-common/Wunused-var-10.c: New test.
 

gcc/testsuite/g++.dg/warn/Wunused-var-10.C

+// PR c++/44412
+// { dg-do compile }
+// { dg-options "-Wunused" }
+
+struct S
+{
+  static const int a = 3;
+  static int b;
+  int c;
+};
+
+const int S::a;
+int S::b = 4;
+
+int
+f1 ()
+{
+  S s;
+  return s.a;
+}
+
+int
+f2 ()
+{
+  S s;
+  return s.b;
+}
+
+void
+f3 ()
+{
+  S s;		// { dg-warning "set but not used" }
+  s.c = 6;
+}
+
+int
+f4 ()
+{
+  S s;
+  s.c = 6;
+  return s.c;
+}

gcc/testsuite/g++.dg/warn/Wunused-var-11.C

+// PR c++/44412
+// { dg-do compile }
+// { dg-options "-Wunused" }
+
+struct S
+{
+  int foo ();
+  static int bar ();
+};
+
+int S::foo ()
+{
+  return 5;
+}
+
+int S::bar ()
+{
+  return 6;
+}
+
+int
+f1 ()
+{
+  S s;
+  return s.foo ();
+}
+
+int
+f2 ()
+{
+  S s;
+  return s.bar ();
+}