COMMITTED: Add support for STT_IFUNC

[Tristan Gingold]

On Dec 5, 2008, at 6:19 AM, Ian Lance Taylor wrote:

> Tristan Gingold <gingold@adacore.com> writes:
>
>> I haven't look at the implementation, but is a STT_IFUNC allowed to
>> have relocations
>> against STT_IFUNC symbols ?
>>
>> If not, this is must be checked at link time, otherwise the entries
>> must be topologically ordered.
>
> I don't see why a topological ordering is required.  It suffices to
> resolve the relocations lazily on demand.  Of course, a circular
> reference will cause an error or an infinite loop.

Humm, right.  But better to detect this at link time rather than  
unexpectedly at run time.