re PR c++/47172 ([C++0x] cannot call member function without object)

Fix PR c++/47172

gcc/cp/

	PR c++/47172
	* pt.c (finish_call_expr): Consider a call expression that has a
	dependent "this" pointer as being dependent.  Add comments.
	(dependent_type_p, type_dependent_expression_p): Update comments.

gcc/testsuite/

	* g++.dg/template/inherit6.C: New test.

From-SVN: r170240

gcc/cp/ChangeLog

+2011-02-11  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/47172
+	* pt.c (finish_call_expr): Consider a call expression that has a
+	dependent "this" pointer as being dependent.  Add comments.
+	(dependent_type_p, type_dependent_expression_p): Update comments.
+
 2011-02-16  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/47326

gcc/cp/pt.c

@@ -17921,7 +17921,7 @@ dependent_type_p_r (tree type)
 }
 
 /* Returns TRUE if TYPE is dependent, in the sense of
-   [temp.dep.type].  */
+   [temp.dep.type].  Note that a NULL type is considered dependent.  */
 
 bool
 dependent_type_p (tree type)
@@ -18193,7 +18193,10 @@ value_dependent_expression_p (tree expression)
 }
 
 /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of
-   [temp.dep.expr].  */
+   [temp.dep.expr].  Note that an expression with no type is
+   considered dependent.  Other parts of the compiler arrange for an
+   expression with type-dependent subexpressions to have no type, so
+   this function doesn't have to be fully recursive.  */
 
 bool
 type_dependent_expression_p (tree expression)

gcc/cp/semantics.c

@@ -2028,8 +2028,19 @@ finish_call_expr (tree fn, VEC(tree,gc) **args, bool disallow_virtual,
 
   if (processing_template_decl)
     {
+      /* If the call expression is dependent, build a CALL_EXPR node
+	 with no type; type_dependent_expression_p recognizes
+	 expressions with no type as being dependent.  */
       if (type_dependent_expression_p (fn)
-	  || any_type_dependent_arguments_p (*args))
+	  || any_type_dependent_arguments_p (*args)
+	  /* For a non-static member function, we need to specifically
+	     test the type dependency of the "this" pointer because it
+	     is not included in *ARGS even though it is considered to
+	     be part of the list of arguments.  Note that this is
+	     related to CWG issues 515 and 1005.  */
+	  || ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
+	      && current_class_ref
+	      && type_dependent_expression_p (current_class_ref)))
 	{
 	  result = build_nt_call_vec (fn, *args);
 	  KOENIG_LOOKUP_P (result) = koenig_p;

gcc/testsuite/ChangeLog

+2011-02-11  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/47172
+	* g++.dg/template/inherit6.C: New test.
+
 2011-02-16  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/47745

gcc/testsuite/g++.dg/template/inherit6.C

+// Origin PR c++/47172
+// { dg-options "-std=c++0x" }
+// { dg-do compile }
+
+struct A
+{
+    int f() const;
+};
+
+template <class T>
+struct B : A { };
+
+template <class T>
+struct C : B<T>
+{
+    void g();
+};
+
+template <class T>
+void C<T>::g()
+{
+    A::f();
+}