Re: PATCH: Don't allow ia64 unwind section to point to section in different files

From: H. J. Lu <hjl_at_lucon.org>
Date: 2005-05-14 07:58:15
On Fri, May 13, 2005 at 02:46:12PM -0700, H. J. Lu wrote:
> On Fri, May 13, 2005 at 02:05:56PM -0700, David Mosberger wrote:
> > >>>>> On Fri, 13 May 2005 14:01:11 -0700, "H. J. Lu" <hjl@lucon.org> said:
> > 
> >   >> However, there still seems to be a binutils issues here: if this
> >   >> is something binutils cannot properly support, it should issue an
> >   >> error, not silently generate wrong code, no?
> > 
> >   HJ> I will see what I can do.
> > 
> 
> When weak functions are used on ia64, part of the unwind section may
> point to the strong definition in a different file. This will lead to
> wrong unwind info. Basically, on ia64, we have to use comdat to get the
> right unwind info. This patch will check it.
> 
> 

Well, it isn't very useful. The problem is libc.a has many weak
functions and user can override them. My patch will make it impossible
on ia64. I guess we may have to live with the imperfect unwind info
when weak functions are used. The unwinder may have to deal with it.


H.J.
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Received on Fri May 13 17:59:52 2005

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