Re: [RFC] Move the frame zero PC check earlier

[Jim Blandy <jimb@codesourcery.com>]

Joel Brobecker <brobecker@adacore.com> writes:
> FWIW, I read the whole thread a couple of times, and I agree with
> Daniel. Something that I have also noticed is that these bogus
> frames actually cause the average users to lose confidence in the
> entire backtrace.
>
> I think that stopping at PC == 0 for all architecture is a good
> approach, and his justification for it is convincinng.

For the record, at the top of this thread I said I thought it was
fine, too.  I've run into these often enough due to deliberate
attempts by runtimes to terminate the stack that I think it outweighs
the (minor, to my mind) value of seeing a 0x00000000 frame that
indicates an actual error.

GDB should be honest with the user about what it finds, but I don't
think we can be a multi-platform debugger and be that picky about
confining each bit of logic to exactly the platforms that promise to
uphold it.