[Bug ld/18414] TOC optimization bug (ignoring data deps on addis/ld -> nop/ld opt)

[hfinkel at anl dot gov]

https://sourceware.org/bugzilla/show_bug.cgi?id=18414

--- Comment #5 from Hal Finkel <hfinkel at anl dot gov> ---
(In reply to Alan Modra from comment #4)
> Hmm, the dependency on r2 was added to gcc 2012-05-21.  Which means that
> people using an older gcc with a newer ld are in trouble.  There needs to be
> some way for ld to detect older gcc code, other than code scanning which is
> unreliable and slow.
> 
> And no, ld does not currently scan code to find the second instruction.  The
> pairing is by the relocations.

Hrmm, good point. What happens to the .ident strings?

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