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[PATCH] PR ld/19636: [x86] Resolve undefweak and defined symbols in executable

H.J. Lu hjl.tools@gmail.com
Wed Feb 24 23:20:00 GMT 2016 
On Wed, Feb 24, 2016 at 3:08 PM, Cary Coutant <ccoutant@gmail.com> wrote:
> FWIW, gold used to leave references to weak undefs for the dynamic
> loader to resolve. We got complaints, and changed it to match gnu ld's
> behavior:
>
> https://sourceware.org/ml/binutils/2008-04/msg00019.html
>
> https://sourceware.org/ml/binutils/2008-04/msg00269.html
>
> I'd prefer not to change ld after having already changed gold to match
> -- especially so when that change was motivated by user complaints.
>
> Daniel replied to the first of the above messages, suggesting that the
> existing ld behavior was surprising, and I agreed. Ian's response was:
>
>> Based on this discussion, I think we should go ahead and commit this
>> to gold.  It makes gold act like GNU ld.  Clearly more thought is
>> required before changing the linker behaviour in this area.
>
> I suppose this thread can be considered "more thought", but it hasn't
> swayed me. We've had eight more years worth of installed base using
> the current behavior since that discussion.
>

Generate a dynamic relocation against undefined weak symbol
isn't an option for x86-64 if input isn't PIC due to run-time relocation
overflow in .text section.

-- 
H.J.
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