| commit | d855157f94b9476883a28c154a5b351c64a1cba9 | [log] [tgz] |
|---|---|---|
| author | Fangrui Song <i@maskray.me> | Fri Nov 12 09:47:31 2021 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Fri Nov 12 09:51:15 2021 -0800 |
| tree | ac10003678d23218d10ba40cfdbec3735e1047da | |
| parent | 5d007bf9de91d0592bdcffca80d68f6bae2bb255 [diff] |
[ELF] Make --no-relax disable R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX GOT optimization
This brings back the original version of D81359.
I have found several use cases now.
* Unlike GNU ld, LLD's relocation processing is one pass. If we decide to
optimize(relax) R_X86_64_{,REX_}GOTPCRELX, we will suppress GOT generation and
cannot undo the decision later. Optimizing R_X86_64_REX_GOTPCRELX can usually
make it easy to hit `relocation R_X86_64_REX_GOTPCRELX out of range` because
the distance to GOT is usually shorter. Without --no-relax, the user has to
recompile with `-Wa,-mrelax-relocations=no`.
* The option would help during my investigationg of the root cause of https://git.kernel.org/linus/09e43968db40c33a73e9ddbfd937f46d5c334924
* There is need for relaxation for AArch64 & RISC-V. Implementing this for
x86-64 improves consistency with little target-specific cost (two-line
X86_64.cpp change).
Reviewed By: alexander-shaposhnikov
Differential Revision: https://reviews.llvm.org/D113615
GitOrigin-RevId: a05384dc8930cbe967def7c5c4113740838e8fd0
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