2004-09-27  Andrew Cagney  <cagney@gnu.org>

	* frame.c (get_prev_frame): Stop backtrace when a zero PC and

	successive normal frames.

Index: gdb-6.8.50.20081128/gdb/frame.c

===================================================================

--- gdb-6.8.50.20081128.orig/gdb/frame.c	2008-12-04 01:34:37.000000000 +0100

+++ gdb-6.8.50.20081128/gdb/frame.c	2008-12-04 01:35:47.000000000 +0100

@@ -1566,6 +1566,18 @@ get_prev_frame (struct frame_info *this_

       return NULL;

     }

+  if (this_frame->level > 0

+#if 0

+      && backtrace_past_zero_pc

+#endif

+      && get_frame_type (this_frame) == NORMAL_FRAME

+      && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME

+      && get_frame_pc (this_frame) == 0)

+    {

+      frame_debug_got_null_frame (this_frame, "zero PC");

+      return NULL;

+    }

+

   return get_prev_frame_1 (this_frame);

 }