[Bug dynamic-link/27924] ld.so: Support DT_RELR relative relocation format

["i at maskray dot me" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27924

--- Comment #10 from Fangrui Song <i at maskray dot me> ---
in-reply-to: https://bugzilla.redhat.com/show_bug.cgi?id=2014699#c1

> * [v2] elf: Support DT_RELR relative relocation format [BZ #27924]
>  * Need official gABI assignment (Carry Coutant status?)
>   * Needs to be reserved verbally by Carry (Action item)
>   * Required for patch acceptance.

s/Carry/Cary.

https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/6psrcLHLAgAJ (2018-02)
https://sourceware.org/bugzilla/show_bug.cgi?id=27924#c7 (2021-06) and
https://sourceware.org/pipermail/libc-alpha/2021-October/131781.html
are verbal by Cary.

> * Need BFD port or a released llvm/lld that supports DT_RELR to review patches.
>  * Minimally a 32-bit and 64-bit port that can build glibc and passes regression testing.
>  * Required for patch review.

LLD since 7.0.0 supports --pack-dyn-relocs=relr.
Both arm and aarch64 ports have users.

ld.lld --pack-dyn-relocs=relr produces working executables on Fuchsia, Linux
kernel's arm64 port, FreeBSD-CURRENT, ChromeOS's (patched glibc) today.
Just that the produced executable segfaults on glibc due to lack of support.

> * Official glibc relese with feature?
>  * Need BFD port to support build-many-glibcs to provide testing confidence.
> * HJ: Would like to see a BFD port before a glibc release with the features.
>  * Sufficient to have a released binutils with DT_RELR also.

Wish that a GNU ld maintainer can work on this...

> * Release date of released static linkers with support should be close to glibc release with feature.
>  * When glibc is released users can pick a static linker to test with (binutils or lld).

LLD since 7.0.0 supports --pack-dyn-relocs=relr, so the release date (2018)
cannot be close to the glibc version now...
Even in the absence of GNU ld support,  with DT_RELR support, users can use
ld.lld --pack-dyn-relocs=relr today.

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