2010-08-31  Michael Snyder  <msnyder@msnyder-server.eng.vmware.com>

	* infrun.c (set_exec_direction_func): Error out if target does not
	support reverse execution.

Index: infrun.c
===================================================================
RCS file: /cvs/src/src/gdb/infrun.c,v
retrieving revision 1.445
diff -u -p -r1.445 infrun.c
--- infrun.c	1 Jul 2010 15:36:15 -0000	1.445
+++ infrun.c	31 Aug 2010 18:32:36 -0000
@@ -6436,6 +6436,8 @@ set_exec_direction_func (char *args, int
       else if (!strcmp (exec_direction, exec_reverse))
 	execution_direction = EXEC_REVERSE;
     }
+  else
+    error (_("Target does not support this operation."));
 }
 
 static void