mirror of
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bbe070a078
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/19.x llvmorg-19.1.0-rc2-0-gd033ae172d1c.
PR: 280562
MFC after: 1 month
(cherry picked from commit 52418fc2be)
120 lines
5.9 KiB
ReStructuredText
120 lines
5.9 KiB
ReStructuredText
===========================
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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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* Experimental CREL relocations with explicit addends are now supported using the
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temporary section type code 0x40000020 (``clang -c -Wa,--crel,--allow-experimental-crel``).
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LLVM will change the code and break compatibility (Clang and lld of different
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versions are not guaranteed to cooperate, unlike other features). CREL with
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implicit addends are not supported.
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(`#98115 <https://github.com/llvm/llvm-project/pull/98115>`_)
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* ``EI_OSABI`` in the output is now inferred from input object files.
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(`#97144 <https://github.com/llvm/llvm-project/pull/97144>`_)
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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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* zstd compression parallelism no longer requires ``ZSTD_MULITHREAD`` build.
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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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* ``--no-allow-shlib-undefined`` now rejects non-exported definitions in the
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``def-hidden.so ref.so`` case.
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(`#86777 <https://github.com/llvm/llvm-project/issues/86777>`_)
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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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* ``--enable-non-contiguous-regions`` option allows automatically packing input
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sections into memory regions by automatically spilling to later matches if a
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region would overflow. This reduces the toil of manually packing regions
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(typical for embedded). It also makes full LTO feasible in such cases, since
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IR merging currently prevents the linker script from referring to input
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files. (`#90007 <https://github.com/llvm/llvm-project/pull/90007>`_)
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* ``--default-script`/``-dT`` is implemented to specify a default script that is processed
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if ``--script``/``-T`` is not specified.
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(`#89327 <https://github.com/llvm/llvm-project/pull/89327>`_)
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* ``--force-group-allocation`` is implemented to discard ``SHT_GROUP`` sections
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and combine relocation sections if their relocated section group members are
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placed to the same output section.
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(`#94704 <https://github.com/llvm/llvm-project/pull/94704>`_)
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* ``--build-id`` now defaults to generating a 20-byte digest ("sha1") instead
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of 8-byte ("fast"). This improves compatibility with RPM packaging tools.
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(`#93943 <https://github.com/llvm/llvm-project/pull/93943>`_)
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* ``-z lrodata-after-bss`` is implemented to place ``.lrodata`` after ``.bss``.
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(`#81224 <https://github.com/llvm/llvm-project/pull/81224>`_)
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* ``--export-dynamic`` no longer creates dynamic sections for ``-no-pie`` static linking.
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* ``--lto-emit-asm`` is now added as the canonical spelling of ``--plugin-opt=emit-llvm``.
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* ``--lto-emit-llvm`` now uses the pre-codegen module.
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(`#97480 <https://github.com/llvm/llvm-project/pull/97480>`_)
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* When AArch64 PAuth is enabled, ``-z pack-relative-relocs`` now encodes ``R_AARCH64_AUTH_RELATIVE`` relocations in ``.rela.auth.dyn``.
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(`#96496 <https://github.com/llvm/llvm-project/pull/96496>`_)
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* ``-z gcs`` and ``-z gcs-report`` are now supported for AArch64 Guarded Control Stack extension.
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* ``-r`` now forces ``-Bstatic``.
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* Thumb2 PLT is now supported for Cortex-M processors.
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(`#93644 <https://github.com/llvm/llvm-project/pull/93644>`_)
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* ``DW_EH_sdata4`` of addresses larger than 0x80000000 is now supported for MIPS32.
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(`#92438 <https://github.com/llvm/llvm-project/pull/92438>`_)
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* Certain unknown section types are rejected.
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(`#85173 <https://github.com/llvm/llvm-project/pull/85173>`_)
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* ``PROVIDE(lhs = rhs) PROVIDE(rhs = ...)``, ``lhs`` is now defined only if ``rhs`` is needed.
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(`#74771 <https://github.com/llvm/llvm-project/issues/74771>`_)
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(`#87530 <https://github.com/llvm/llvm-project/pull/87530>`_)
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* ``OUTPUT_FORMAT(binary)`` is now supported.
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(`#98837 <https://github.com/llvm/llvm-project/pull/98837>`_)
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* ``NOCROSSREFS`` and ``NOCRFOSSREFS_TO`` commands now supported to prohibit
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cross references between certain output sections.
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(`#98773 <https://github.com/llvm/llvm-project/pull/98773>`_)
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* Orphan placement is refined to prefer the last similar section when its rank <= orphan's rank.
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(`#94099 <https://github.com/llvm/llvm-project/pull/94099>`_)
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Non-alloc orphan sections are now placed at the end.
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(`#94519 <https://github.com/llvm/llvm-project/pull/94519>`_)
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* ``R_X86_64_REX_GOTPCRELX`` of the addq form is no longer incorrectly optimized when the address is larger than 0x80000000.
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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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* Chained fixups are now enabled by default when targeting macOS 13.0,
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iOS 13.4, tvOS 14.0, watchOS 7.0, and visionOS 1.0 or later.
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They can be disabled with the `-no_fixup_chains` flag.
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(`#99255 <https://github.com/llvm/llvm-project/pull/99255>`_)
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WebAssembly Improvements
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------------------------
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Fixes
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#####
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