[PATCH] D15235: [ELF] - Implemented R_*_IRELATIVE relocations for x86, x64 targets.

[George Rimar via llvm-commits]

>On Tue, Dec 08, 2015 at 06:21:07PM +0000, Rui Ueyama via llvm-commits wrote:
>> ruiu added a comment.
>>
>> I'm not still sure if these relocations have to be handled by the linker. These relocations use runtime addresses, so only the dynamic linker has to handle them, no?
>
>We should have at least some story for static linking. IIRC glibc
>doesn't support it for that, but if I ever want to exploit them for
>NetBSD, consistent behavior for static binaries certainly is a
>must-have. It could transform it to a stub function that does an
>indirect call.
>
>Joerg

Thats sounds like separate specific feature. But in my opinion it opposes to core idea of GNU_IFUNC which was fast dispatching.
If I correctly undertand the idea of stub: it will call ifunc method to get the address of destination function and then call it, that will happen for each call.
Idea of ifunc was to resolve all of that that during the first call or even during app start. So such change will bring some slowdown.
Best solution I think would be to update dynamic linker to support the ifunc.

George