This is the mail archive of the gcc-bugs@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

[Bug target/50678] [4.7 Regression] FAIL: c52104y on x86_64-apple-darwin10


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50678

--- Comment #51 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-10-18 20:04:38 UTC ---
> 2. if the vendor decides to 'fix' libunwind .. we won't detect this ... 
> (although I still think this idea is worth pursuing, on the grounds that 'no
> fix' or a fix to Libc are more likely).

They cannot change libunwind as this will break binary compatibility for all
the programs using it.  In contrast, 99.99% of the programs don't care about
the unwind info of _sigtramp (otherwise the bug wouldn't have survived long).

> 3. _Unwind_Find_FDE is returning NULL in the following proof-of-concept hack..

IIRC this can happen if the frame uses "compact unwind info", but I don't know
what this means.

We could probably get away by using the core routines of libunwind, but I
wonder if this is really worth the hassle.  Let's wait a little and see what
kind of reply we get from the Apple side.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]