breakpoint highlighting in source buffer for gdb-mode

Hi there,

I'm looking for the extension|configuration for gdb-mode for breakpoint
highlighting in source buffer.

The JDEE has this feature. I asked Paul, but he isn't aware of such
extension for gdb-mode in emacs.
Here is his answer:

 >> Hello Paul,
 >>
 >> After I've used the JDB with jde in xemacs, I'm missing this feature
 >> (highlight breakpoint) in source window in GDB-mode, when
 >> debugging the C/C++ program.
 >>
 >> Can you give me any hint, how to do it,

>Hi David,
>
>You'd have to modify the GDB set breakpoint command to highlight
>the line at which a breakpoint occurs. The JDEE uses an Emacs
>feature called overlays (or extents in XEmacs) to color the lines.
>The JDEE's code for doing this is in the file jde-db.el. You could
>look at it for examples of how to implement breakpoint highlighting.
>
>The JDEE breakpoint command saves the line at which a breakpoint
>is set in a list of breakpoints. It colors the line green initially.
>If an application is running, it sends a set breakpoint command
>to the debugger and colors the line yellow to indicate that
>a set breakpoint command has been issued to the debugger.
>The JDEE also sets up a process I/O listener that detects
>responses from the debugger. If this listener receives a
>response from the debugger that a breakpoint has been set, it
>looks up the breakpoint in the list of breakpoints and if it
>finds it, it changes the color of the highlight to red to
>indicate that the breakpoint has been set. To summarize:

>green  -> Emacs has been asked to set a breakpoint.
>yellow -> Emacs has sent the breakpoint request to the debugger
>red    -> The debugger has confirmed that the breakpoint has been set.

>Hope this helps.

>> or may be you are aware of some
>> hack for gdb to achive that?
>>

>I'm not aware of any breakpoint highlighting code for gdb.
>Paul

Any help would be greatly appreciated.
David Ostrovsky