[PATCH v2] elf: Support DT_RELR relative relocation format [BZ #27924]

[Carlos O'Donell]

On 10/16/21 20:50, Fangrui Song via Binutils wrote:
> PIE and shared objects usually have many relative relocations. In
> 2017/2018, SHT_RELR/DT_RELR was proposed on
> https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/GxjM0L-PBAAJ
> ("Proposal for a new section type SHT_RELR") and is a pre-standard. RELR
> usually takes 3% or smaller space than R_*_RELATIVE relocations. The
> virtual memory size of a mostly statically linked PIE is typically 5~10%
> smaller.

We've been going over this patch on the weekly Monday patch queue review.

I took a note to point out that one of the blockers here is that it is difficult
to immediately test this work because it requires a working glibc build using
ldd (which has support for DT_RELR).

What is the status of the lld support patches for glibc?

If we made progress on the lld support then we'd be able to more easily review
a testable configuration and keep the review going forward.

-- 
Cheers,
Carlos.