242a9cf7e6
Solve two issues that showed up when using LLD with Unreal Engine & FASTBuild: 1. It seems the S_OBJNAME record doesn't always record the "precomp signature". We were relying on that to match the PCH.OBJ with their dependent-OBJ. 2. MSVC link.exe is able to link a PCH.OBJ when the "precomp signatureÈ doesn't match, but LLD was failing. This was occuring since the Unreal Engine Build Tool was compiling the PCH.OBJ, but the dependent-OBJ were compiled & cached through FASTBuild. Upon a clean rebuild, the PCH.OBJs were recompiled by the Unreal Build Tool, thus the "precomp signatures" were changing; however the OBJs were already cached by FASTBuild, thus having an old "precomp signatures". We now ignore "precomp signatures" and properly fallback to cmd-line name lookup, like MSVC link.exe does, and only fail if the PCH.OBJ type stream doesn't match the count expected by the dependent-OBJ. Differential Revision: https://reviews.llvm.org/D136762
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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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* ``ELFCOMPRESS_ZSTD`` compressed input sections are now supported.
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(`D129406 <https://reviews.llvm.org/D129406>`_)
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* ``--compress-debug-sections=zstd`` is now available to compress debug
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sections with zstd (``ELFCOMPRESS_ZSTD``).
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(`D133548 <https://reviews.llvm.org/D133548>`_)
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* ``--no-warnings``/``-w`` is now available to suppress warnings.
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(`D136569 <https://reviews.llvm.org/D136569>`_)
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Breaking changes
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----------------
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COFF Improvements
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-----------------
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* The linker command line entry in ``S_ENVBLOCK`` of the PDB is now stripped
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from input files, to align with MSVC behavior.
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(`D137723 <https://reviews.llvm.org/D137723>`_)
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* Switched from SHA1 to BLAKE3 for PDB type hashing / ``-gcodeview-ghash``
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(`D137101 <https://reviews.llvm.org/D137101>`_)
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* Improvements to the PCH.OBJ files handling. Now LLD behaves the same as MSVC
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link.exe when merging PCH.OBJ files that don't have the same signature.
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(`D136762 <https://reviews.llvm.org/D136762>`_)
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MinGW Improvements
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------------------
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* The lld-specific options ``--guard-cf``, ``--no-guard-cf``,
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``--guard-longjmp`` and ``--no-guard-longjmp`` has been added to allow
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enabling Control Flow Guard and long jump hardening. These options are
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disabled by default, but enabling ``--guard-cf`` will also enable
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``--guard-longjmp`` unless ``--no-guard-longjmp`` is also specified.
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``--guard-longjmp`` depends on ``--guard-cf`` and cannot be used by itself.
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Note that these features require the ``_load_config_used`` symbol to contain
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the load config directory and be filled with the required symbols.
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(`D132808 <https://reviews.llvm.org/D132808>`_)
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MachO Improvements
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------------------
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WebAssembly Improvements
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------------------------
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