[PATCH] D133548: [ELF] Add --compress-debug-sections=zstd

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
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This compresses output debug sections with zstd and sets ch_type to
ELFCOMPRESS_ZSTD. As of today, very few DWARF consumers recognize
ELFCOMPRESS_ZSTD.

Use the llvm::zstd::compress API with level llvm::zstd::DefaultCompression (5),
which we may tune after we have more experience with zstd output.
zstd has built-in parallel compression support (so we don't need to do D117853 <https://reviews.llvm.org/D117853>
for zlib), which is not leveraged yet.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133548

Files:
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/Options.td
  lld/ELF/OutputSections.cpp
  lld/docs/ReleaseNotes.rst
  lld/docs/ld.lld.1
  lld/test/ELF/compress-debug-sections-zstd.s

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