[all-commits] [llvm/llvm-project] 6d44a1: [ELF] Adjust --compress-sections to support compre...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6d44a1ef55b559e59d725b07ffe1da988b4e5f1c
      https://github.com/llvm/llvm-project/commit/6d44a1ef55b559e59d725b07ffe1da988b4e5f1c
  Author: Fangrui Song <i at maskray.me>
  Date:   2024-05-01 (Wed, 01 May 2024)

  Changed paths:
    M lld/ELF/Config.h
    M lld/ELF/Driver.cpp
    M lld/ELF/Options.td
    M lld/ELF/OutputSections.cpp
    M lld/docs/ReleaseNotes.rst
    M lld/docs/ld.lld.1
    M lld/test/ELF/compress-sections.s
    M lld/test/ELF/compressed-debug-level.test

  Log Message:
  -----------
  [ELF] Adjust --compress-sections to support compression level

zstd excels at scaling from low-ratio-very-fast to
high-ratio-pretty-slow. Some users prioritize speed and prefer disk read
speed, while others focus on achieving the highest compression ratio
possible, similar to traditional high-ratio codecs like LZMA.

Add an optional `level` to `--compress-sections` (#84855) to cater to
these diverse needs. While we initially aimed for a one-size-fits-all
approach, this no longer seems to work.
(https://richg42.blogspot.com/2015/11/the-lossless-decompression-pareto.html)

When --compress-debug-sections is used together, make
--compress-sections take precedence since --compress-sections is usually
more specific.

Remove the level distinction between -O/-O1 and -O2 for
--compress-debug-sections=zlib for a more consistent user experience.

Pull Request: https://github.com/llvm/llvm-project/pull/90567



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