PATCH: PR other/48007: Unwind library doesn't work with UNITS_PER_WORD > sizeof (void *)

[H.J. Lu]

On Wed, Mar 23, 2011 at 11:20 AM, Richard Henderson <rth@redhat.com> wrote:
> On 03/23/2011 11:04 AM, Jakub Jelinek wrote:
>> For several targets that would grow the context significantly, do you think
>> we really have to do that for all targets rather than just for the
>> sizeof (_Unwind_Word) > sizeof (void *) ones?  The accessors are wrapped
>> in inline functions anyway.
>
> Given that ia64 doesn't use this file, we're talking about 512 bytes for
> most 64-bit targets.  I suppose that's 512 bytes we needn't allocate for
> others, but...
>
> The problem is that we suddenly have a version mismatch.  Suppose we
> conditionally add this, then next decade we need to add some other field
> unconditionally.  Now determining what version X means is non-trivial.
>
> What targets are you worried most about?
>

FWIW, I ran into this on x32, which is totally new and doesn't have
backward compatibility issue.



-- 
H.J.