re PR c++/39742 (ice in C++ overload resolution)

	PR c++/39742
	* call.c (joust): Don't crash on variadic fn.

From-SVN: r145994

gcc/cp/ChangeLog

+2009-04-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/39742
+	* call.c (joust): Don't crash on variadic fn.
+
 2009-04-10  Jason Merrill  <jason@redhat.com>
 
 	PR c++/28301

gcc/cp/call.c

@@ -6801,6 +6801,9 @@ joust (struct z_candidate *cand1, struct z_candidate *cand2, bool warn)
 
       for (i = 0; i < len; ++i)
 	{
+	  /* Don't crash if the fn is variadic.  */
+	  if (!parms1)
+	    break;
 	  parms1 = TREE_CHAIN (parms1);
 	  parms2 = TREE_CHAIN (parms2);
 	}

gcc/testsuite/ChangeLog

+2009-04-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/39742
+	* g++.dg/overload/extern-C-2.C: New.
+
 2009-04-12  Joseph Myers  <joseph@codesourcery.com>
 
 	PR preprocessor/31869

gcc/testsuite/g++.dg/overload/extern-C-2.C

+// PR c++/39742
+
+void f( int, ...);
+
+struct S
+{
+};
+
+void
+g()
+{
+  void f( int, ...);
+
+  S t;
+
+  f(1, t);
+}
+
+void
+f( int i, ...)
+{
+}