re PR c++/42687 (The prevention of ADL with the help of parentheses doesn't work)

	PR c++/42687
	* parser.c (cp_parser_primary_expression): Set *idk to
	CP_ID_KIND_NONE for a parenthesized identifier.

From-SVN: r173007

gcc/cp/ChangeLog

 2011-04-26  Jason Merrill  <jason@redhat.com>
 
+	PR c++/42687
+	* parser.c (cp_parser_primary_expression): Set *idk to
+	CP_ID_KIND_NONE for a parenthesized identifier.
+
 	* ptree.c (cxx_print_type) [TYPENAME_TYPE]: Dump fullname.
 	(cxx_print_identifier): Correct indentation.
 

gcc/cp/parser.c

@@ -3437,6 +3437,12 @@ cp_parser_primary_expression (cp_parser *parser,
 	       `&A::B' might be a pointer-to-member, but `&(A::B)' is
 	       not.  */
 	    finish_parenthesized_expr (expr);
+	    /* DR 705: Wrapping an unqualified name in parentheses
+	       suppresses arg-dependent lookup.  We want to pass back
+	       CP_ID_KIND_QUALIFIED for suppressing vtable lookup
+	       (c++/37862), but none of the others.  */
+	    if (*idk != CP_ID_KIND_QUALIFIED)
+	      *idk = CP_ID_KIND_NONE;
 	  }
 	/* The `>' token might be the end of a template-id or
 	   template-parameter-list now.  */

gcc/testsuite/ChangeLog

 2011-04-26  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/lookup/koenig13.C: New.
+
 	* g++.dg/cpp0x/initlist48.C: New.
 
 2011-04-25  Jason Merrill  <jason@redhat.com>

gcc/testsuite/g++.dg/lookup/koenig13.C

+// PR c++/42687
+// DR 705
+
+namespace N
+{
+    struct S { };
+    void f(const S &) { }
+}
+
+void f(const N::S &) { }
+
+int main()
+{
+    N::S v;
+    (f)(v); // no ambiguity: ADL is prevented with (), only ::f is considered
+}