Update LTO plugin interface

H.J. Lu hjl.tools@gmail.com
Thu Dec 2 17:13:00 GMT 2010


On Thu, Dec 2, 2010 at 9:00 AM, Ian Lance Taylor <iant@google.com> wrote:
> "H.J. Lu" <hjl.tools@gmail.com> writes:
>
>> I am not saying we should go with 2 stage linking. Just for clarification.
>> In 2 stage linking, the first stage only does symbol resolution. The complete
>> linking starts at the second stage.  So we don't do really complete relink
>> in 2 stage linking.
>
> Understood.  But you still read and process all the symbols twice.  It
> can be done if it must be done, but it would be significantly better to
> do something else if possible.
>

Without 2 stage linking, which many compilers do for LTO, we will add hack
on top of hack.  As Richard pointed out, we need at least

-lc -lgcc -lm -lpthreads -lgcov  and maybe libssp, libgomp, ...

-lm is currently added by user, not GCC driver

Pass-through is just a hack, not a solution.


-- 
H.J.



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