Re: RFC: [PATCH] Properly handle relocs against absolute symbols

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Tue, Mar 15, 2016 at 2:17 AM, Alan Modra <amodra@gmail.com> wrote:
> On Sun, Mar 13, 2016 at 05:25:55PM -0700, H.J. Lu wrote:
>> +  /* Symbol is defiend by linker.  */
>> +  unsigned int def_linker : 1;
>> +  /* Symbol is defiend by linker and absolue.  */
>> +  unsigned int def_linker_abs : 1;
>
> Hmm, you need to add these because you want to make decisions at
> size_dynamic_sections time based on a symbol's section, and symbols
> defined in a linker script don't have their final section set until
> later.  I don't see a practical way of setting a linker defined
> symbol's section and value before section vmas are finalized, so
> setting them early enough doesn't seem an option.

Yes, I am aware of it now.

> How about implementing a linker callback instead of adding yet more
> flags to struct elf_link_hash_entry?  I'm thinking that you could add
> a rel_from_abs flag to struct definedness_hash_entry, set in
> update_definedness, then have the callback interrogate the
> definedness_table.

I will give it a try,

Thanks.

-- 
H.J.