2c1bdd4a08
Following from the discussion in #132224, this seems like the best approach to deal with a mix of XO and RX output sections in the same binary. This change will also simplify the implementation of the PURECODE section flag for AArch64. To control this behaviour, the `--[no-]xosegment` flag is added to LLD (similarly to `--[no-]rosegment`), which determines whether to allow merging XO and RX sections in the same segment. The default value is `--no-xosegment`, which is a breaking change compared to the previous behaviour. Release notes are also added, since this will be a breaking change.
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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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* For AArch64, added support for ``-zgcs-report-dynamic``, enabling checks for
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GNU GCS Attribute Flags in Dynamic Objects when GCS is enabled. Inherits value
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from ``-zgcs-report`` (capped at ``warning`` level) unless user-defined,
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ensuring compatibility with GNU ld linker.
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* The default Hexagon architecture version in ELF object files produced by
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lld is changed to v68. This change is only effective when the version is
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not provided in the command line by the user and cannot be inferred from
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inputs.
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* ``--why-live=<glob>`` prints for each symbol matching ``<glob>`` a chain of
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items that kept it live during garbage collection. This is inspired by the
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Mach-O LLD feature of the same name.
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* Linker script ``OVERLAY`` descriptions now support virtual memory regions
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(e.g. ``>region``) and ``NOCROSSREFS``.
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* Added ``--xosegment`` and ``--no-xosegment`` flags to control whether to place
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executable-only and readable-executable sections in the same segment. The
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default value is ``--no-xosegment``.
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(`#132412 <https://github.com/llvm/llvm-project/pull/132412>`_)
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Breaking changes
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----------------
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* Executable-only and readable-executable sections are now allowed to be placed
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in the same segment by default. Pass ``--xosegment`` to lld in order to get
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the old behavior back.
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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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