diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c5c0d6ff5a5..8849b98a52d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2006-07-27  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR driver/28437
+	* opts-common.c (prune_options): Skip joined switches.
+
 2006-07-27  Jan Hubicka  <jh@suse.cz>
 
 	PR rtl-optimization/28071
diff --git a/gcc/opts-common.c b/gcc/opts-common.c
index f3f6542095f..958e6677322 100644
--- a/gcc/opts-common.c
+++ b/gcc/opts-common.c
@@ -175,6 +175,10 @@ cont:
       if (option->neg_index < 0)
 	goto cont;
 
+      /* Skip joined switches.  */
+      if ((option->flags & CL_JOINED))
+	goto cont;
+
       /* Reject negative form of switches that don't take negatives as
 	 unrecognized.  */
       if (!value && (option->flags & CL_REJECT_NEGATIVE))