Re: [gandalf@winds.org: Trying to figure out a change in latest binutils for linux]

["H. J. Lu" <hjl at lucon dot org>]

On Wed, Oct 23, 2002 at 09:44:25AM +0930, Alan Modra wrote:
> On Tue, Oct 22, 2002 at 02:42:58PM -0700, H. J. Lu wrote:
> > Alan, Any ideas?
> 
> Yeah.  The expression "err_not386 - _start" is not resolving because
> err_not386 is in a different section and _start is global.  Since
> global ELF syms can be overridden, this sort of expression isn't
> really proper;  You'd need to emit a reloc against _two_ symbol for
> this to work assuming ELF semantics.  If the subtrahend were a local
> label gas would happily turn this into a pcrel reloc against
> err_not386.
> 
> Versions of gas prior to my write.c changes ignored the global
> characteristics of ELF symbols used as subtrahends, treating them as
> local syms.  I guess I may need to return to this behaviour for the
> sake of assembly code, since that seems to be the generally expected
> thing.  Opinions anyone?

Not a bad idea. When you do, please also add a testcae. Thanks.


H.J.