6d44a1ef55
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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===========================
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lld |release| Release Notes
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===========================
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.. contents::
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:local:
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming LLVM |release| release.
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
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============
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This document contains the release notes for the lld linker, release |release|.
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Here we describe the status of lld, including major improvements
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from the previous release. All lld releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
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=================================================
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ELF Improvements
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----------------
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* ``--compress-sections <section-glib>={none,zlib,zstd}[:level]`` is added to compress
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matched output sections without the ``SHF_ALLOC`` flag.
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(`#84855 <https://github.com/llvm/llvm-project/pull/84855>`_)
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(`#90567 <https://github.com/llvm/llvm-project/pull/90567>`_)
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* The default compression level for zlib is now independent of linker
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optimization level (``Z_BEST_SPEED``).
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* ``GNU_PROPERTY_AARCH64_FEATURE_PAUTH`` notes, ``R_AARCH64_AUTH_ABS64`` and
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``R_AARCH64_AUTH_RELATIVE`` relocations are now supported.
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(`#72714 <https://github.com/llvm/llvm-project/pull/72714>`_)
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* ``--debug-names`` is added to create a merged ``.debug_names`` index
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from input ``.debug_names`` sections. Type units are not handled yet.
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(`#86508 <https://github.com/llvm/llvm-project/pull/86508>`_)
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Breaking changes
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----------------
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COFF Improvements
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-----------------
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MinGW Improvements
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------------------
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MachO Improvements
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------------------
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WebAssembly Improvements
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------------------------
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Fixes
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#####
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