fd609e5d33
Add --bp-compression-sort-section=<glob>[=<layout_priority>[=<match_priority>]] to let users split input sections into multiple compression groups, run balanced partitioning independently per group, and leave out sections that are poor candidates for BP. This replaces the old coarse --bp-compression-sort with a more explicit, user-controlled one. In ELF, the glob matches input section names (.text.unlikely.cold1). In Mach-O, it matches the concatenated segment+section name (__TEXT__text). layout_priority controls group placement in the final layout. match_priority resolves conflicts when multiple globs match the same section: explicit priority beats positional matching, and among positional specs the last match wins. A CRTP hook getCompressionSubgroupKey() allows backends to further subdivide glob groups into independent BP instances. This allows Mach-O backend to separate cold functions via N_COLD_FUNC in the future. The deprecated --bp-compression-sort option keeps its existing function/data behavior by assigning sections to fixed legacy groups.
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.. If you want to modify sections/contents permanently, you should modify both
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ReleaseNotes.rst and ReleaseNotesTemplate.txt.
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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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* Added ``--bp-compression-sort-section=<glob>[=<layout_priority>[=<match_priority>]]``,
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replacing the old coarse ``--bp-compression-sort`` modes with a way to split
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input sections into multiple compression groups, run balanced partitioning
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independently per group, and leave out sections that are poor candidates for
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BP.
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``layout_priority`` controls group placement order (lower value = placed
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first, default 0). ``match_priority`` resolves conflicts when multiple globs
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match the same section (lower value = higher priority; explicit priority
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beats positional last-match-wins; default: positional). In ELF, the glob
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matches input section names (e.g. ``.text.unlikely.code1``).
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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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* ``--bp-compression-sort-section`` now accepts optional layout and match
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priorities (same syntax as ELF). In Mach-O, the glob matches the
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concatenated segment+section name (e.g. ``__TEXT__text``).
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WebAssembly Improvements
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------------------------
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Fixes
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#####
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