re PR c++/17829 (wrong error: call of overloaded function is ambiguous)

cp:
	PR c++/17829
	* parser.c (cp_parser_postfix_expression): Inhibit Koenig when
	unqualified lookup finds a member function.
testsuite:
	PR c++/17829
	* g++.dg/lookup/koenig4.C: New.

From-SVN: r88558

gcc/cp/ChangeLog

+2004-10-05  Nathan Sidwell  <nathan@codesourcery.com>
+
+	PR c++/17829
+	* parser.c (cp_parser_postfix_expression): Inhibit Koenig when
+	unqualified lookup finds a member function.
+
 2004-10-04  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	Convert diagnostics to use quoting flag q 4/n

gcc/cp/parser.c

@@ -4061,20 +4061,38 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p)
 	    koenig_p = false;
 	    if (idk == CP_ID_KIND_UNQUALIFIED)
 	      {
+		if (TREE_CODE (postfix_expression) == IDENTIFIER_NODE)
+		  {
+		    if (args)
+		      {
+			koenig_p = true;
+			postfix_expression
+			  = perform_koenig_lookup (postfix_expression, args);
+		      }
+		    else
+		      postfix_expression
+			= unqualified_fn_lookup_error (postfix_expression);
+		  }
 		/* We do not perform argument-dependent lookup if
 		   normal lookup finds a non-function, in accordance
 		   with the expected resolution of DR 218.  */
-		if (args
-		    && (is_overloaded_fn (postfix_expression)
-			|| TREE_CODE (postfix_expression) == IDENTIFIER_NODE))
+		else if (args && is_overloaded_fn (postfix_expression))
 		  {
-		    koenig_p = true;
-		    postfix_expression
-		      = perform_koenig_lookup (postfix_expression, args);
+		    tree fn = get_first_fn (postfix_expression);
+
+		    if (TREE_CODE (fn) == TEMPLATE_ID_EXPR)
+		      fn = OVL_CURRENT (TREE_OPERAND (fn, 0));
+
+		    /* Only do argument dependent lookup if regular
+		       lookup does not find a set of member functions.
+		       [basic.lookup.koenig]/2a  */
+		    if (!DECL_FUNCTION_MEMBER_P (fn))
+		      {
+			koenig_p = true;
+			postfix_expression
+			  = perform_koenig_lookup (postfix_expression, args);
+		      }
 		  }
-		else if (TREE_CODE (postfix_expression) == IDENTIFIER_NODE)
-		  postfix_expression
-		    = unqualified_fn_lookup_error (postfix_expression);
 	      }
 
 	    if (TREE_CODE (postfix_expression) == COMPONENT_REF)

gcc/testsuite/ChangeLog

+2004-10-05  Nathan Sidwell  <nathan@codesourcery.com>
+
+	PR c++/17829
+	* g++.dg/lookup/koenig4.C: New.
+
 2004-10-05  Gabriel Dos Reis  <gdr@integrable-solutions.net>
 
 	* g++.dg/other/classkey1.C: Adjust quoting marks.
@@ -22219,7 +22224,7 @@ Thu Apr 27 15:58:18 MET DST 2000  Jan Hubicka  <jh@suse.cz>
 
 	* gcc.c-torture/compile/labels-2.c: New test.
 
-1999-12-27  Martin von Lwis  <loewis@informatik.hu-berlin.de>
+1999-12-27  Martin von Löwis  <loewis@informatik.hu-berlin.de>
 
 	* gcc.c-torture/execute/991227-1.c: New test.
 
@@ -22227,7 +22232,7 @@ Thu Apr 27 15:58:18 MET DST 2000  Jan Hubicka  <jh@suse.cz>
 
 	* g++.old-deja/g++.pt/instantiate6.C: Remove excess errors XFAIL.
 
-1999-12-21  Martin von Lwis  <loewis@informatik.hu-berlin.de>
+1999-12-21  Martin von Löwis  <loewis@informatik.hu-berlin.de>
 
 	* gcc.c-torture/execute/991221-1.c: New test.
 

gcc/testsuite/g++.dg/lookup/koenig4.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 5 Oct 2004 <nathan@codesourcery.com>
+
+// Origin: Wolfgang Bangerth <bangerth@dealii.org>
+// Incorrect koenig lookup
+
+struct A {}; 
+ 
+struct B { 
+    static void foo(); 
+    static void bar(const A &); 
+};   
+     
+void bar(const A &){} 
+     
+void B::foo () {    
+    A a; 
+    bar (a); 
+}