[Bug target/51921] [4.6/4.7 regression] EH unwinding support is broken

["ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51921

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-02-07 17:54:18 UTC ---
> You know perfectly well that such a proof is practically impossible:
> that would mean updating a machine through every single Solaris 8/9/10
> kernel/libc/libthread patch ever released.  The other way round, I'd
> claim that you cannot prove that the old code works for every since such
> combination either.

I cannot indeed, but we now have a case where the old code used to work and the
new code fails. Granted, this isn't an official release, but it's annoying and
casts a legitimate doubt on the robustness of the new code.

> You claimed that before, and that's what I tried at first to make
> Solaris 11 work, but failed completely.

OK, do you know of a Solaris 11 machine to which I could have access?  AdaCore
doesn't have one for the time being.

> Why didn't you object then when it was submitted *and accepted*, has
> been in for almost a year, been shipped with a release, and revert it
> shortly before the next release?

I already managed to block a backport to the 4.5 branch. :-)  As for the
shortly, I wrote a first message on 11/28, got no answers, then applied the
change on 01/09, that is to say about 3 months before the planned shipping
date.