Re: [hppa] FYI: confusion in unwind descriptor field meaning

[Randolph Chung <randolph@tausq.org>]

Joel Brobecker wrote:
>>Be careful here, some of this is to work around gcc's interpretation of 
>>these fields, which does not always correspond to the documentation. gcc 
>>only uses a few of the bits in the unwind record.
> 
> Grumble.
> 
> Yes, I know. It's the reason why I never got around to submit the few
> changes we made locally. Our GCC has some local changes that make the
> unwind descriptor more compatible between the two models. I am still
> asking the details to the hppa specialist at AdaCore, but it seems
> that starting with GCC 3.4, the frame was setup in a more compatible
> way already. If you're interested, I'll let you know the details of
> our implementation.

Well, I think we need to work with upstream gcc. I know Dave has done
some work to improve this with more recent versions of gcc.

Let's try to document all the variations of compilers we claim to work
with (gcc-3.x, gcc-4.x, HP aCC, etc) and we'll try to come up with
something that works "everywhere".

randolph
-- 
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/