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/frame.c

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

RCS file: /cvs/src/src/gdb/frame.c,v

retrieving revision 1.191

diff -p -u -r1.191 frame.c

--- ./gdb/frame.c	1 Sep 2004 14:13:33 -0000	1.191

+++ ./gdb/frame.c	28 Sep 2004 02:45:58 -0000

@@ -1235,6 +1235,18 @@ 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 (gdb_stdlog, this_frame, "zero PC");

+      return NULL;

+    }

+

   return get_prev_frame_1 (this_frame);

 }