Abort backtrace when consecutive zero PCs?

[Andrew Cagney]

> On Wed, Sep 15, 2004 at 01:34:21PM -0400, Andrew Cagney wrote:
> 
>>> Hello,
>>> 
>>> One backtrace infinite loop case I've noticed (especially on ia64) is 
>>> where successive frames all have a zero PC.
>>> 
>>> While we definitly need to allow a backtrace through a single zero PC 
>>> (for a NULL pointer call - signull.exp) should we make GDB abort when 
>>> two or more consecutive frames have a zero PC?
>>> 
>>> (mumble something about a runtime option)
>>> 
>>> thoughts?
> 
> 
> I still think that you

me or we?  Do you have a pointer to the thread?

 > want to reject zero PC followed by a normal
> (non-signal/dummy) frame, for exactly this reason...

That sounds like a NULL pointer function call, which is what signull.exp 
is all about.

Andrew