Re: [PATCH] Indicate dependency on personality routines for ARM EHABI

[Richard Earnshaw <rearnsha@gcc.gnu.org>]

On Wed, 2005-02-09 at 16:58, Ian Lance Taylor wrote:
> Richard Earnshaw <rearnsha@gcc.gnu.org> writes:
> 
> > > More generally, I think it's kind of dubious to use a zero reloc to
> > > mean anything at all.  And why do you need a relocation entry?  Why is
> > > it not sufficient to enter the symbol in the symbol table as an
> > > undefined symbol?  Is the use of a zero reloc mandated by the ARM ABI?
> > 
> > Because the unwind module only weakly links to the personality modules
> > (but it is the one that ends up calling them).
> > 
> > The module that needs the unwinding has to provide the strong reference
> > to ensure that it gets included in the link set.
> > 
> > Doing it this way ensures that only personality modules that are needed
> > get included in the final image.
> 
> I would expect a strong undefined symbol would achieve the same effect
> without the relocation entry.

I suspect that wouldn't work if you did unused section elimination.

> But if the ABI requires the relocation entry, that is fine.

It's the model that we chose to implement it, so yes, it's needed.

R.