ReleaseNotes: add lld/ELF notes

[MaskRay]

No description provided.

[llvmbot]

@llvm/pr-subscribers-lld

Author: Fangrui Song (MaskRay)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/124508.diff

1 Files Affected:

• (modified) lld/docs/ReleaseNotes.rst (+23)

diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst
index 1995c80df652cb..5e07a869a09a04 100644
--- a/lld/docs/ReleaseNotes.rst
+++ b/lld/docs/ReleaseNotes.rst
@@ -29,12 +29,35 @@ ELF Improvements
 * ``-z nosectionheader`` has been implemented to omit the section header table.
   The operation is similar to ``llvm-objcopy --strip-sections``.
   (`#101286 <https://github.com/llvm/llvm-project/pull/101286>`_)
+* ``--randomize-section-padding=<seed>`` is introduced to insert random padding
+  between input sections and at the start of each segment.
+* In the tarball created due to ``--reproduce``, directories in the
+  (`#117653 <https://github.com/llvm/llvm-project/pull/117653>`_)
+  ``--dependency-file=`` argument are now stripped to fix non-existent
+  directory error when you invoke ``ld.lld @response.txt``.
+* ``--symbol-ordering-file=`` and call graph profile can now be used together.
+* When ``--call-graph-ordering-file=`` is specified, ``.llvm.call-graph-profile``
+  sections in relocatable files are no longer used.
+* In relocatable links, the ``sh_entsize`` member of a ``SHF_MERGE`` section
+  with relocations is now respected in the output.
+* Quoted symbol names can now be used in output section phdr, the LHS of
+  ``--defsym``, and ``INSERT AFTER``.
 * Section ``CLASS`` linker script syntax binds input sections to named classes,
   which are referenced later one or more times. This provides access to the
   automatic spilling mechanism of `--enable-non-contiguous-regions` without
   globally changing the semantics of section matching. It also independently
   increases the expressive power of linker scripts.
   (`#95323 <https://github.com/llvm/llvm-project/pull/95323>`_)
+* The ``achivename:`` syntax when matching input sections is now supported.
+  (`#119293 <https://github.com/llvm/llvm-project/pull/119293>`_)
+* To support Arm v6-M, short thunks using B.w are no longer generated.
+  (`#118111 <https://github.com/llvm/llvm-project/pull/118111>`_)
+* For AArch64, BTI-aware long branch thunks can now be created to a destination
+  function without a BTI instruction.
+  (`#108989 <https://github.com/llvm/llvm-project/pull/108989>`_)
+  (`#116402 <https://github.com/llvm/llvm-project/pull/116402>`_)
+* Relocations related to GOT and TLSDESC for the AArch64 Pointer Authentication ABI
+  are now supported.
 * Supported relocation types for x86-64 target:
   * ``R_X86_64_CODE_4_GOTPCRELX`` (`#109783 <https://github.com/llvm/llvm-project/pull/109783>`_) (`#116737 <https://github.com/llvm/llvm-project/pull/116737>`_)
   * ``R_X86_64_CODE_4_GOTTPOFF`` (`#116634 <https://github.com/llvm/llvm-project/pull/116634>`_)

[smithp35]

Spotted a small typo, but otherwise LGTM. I'll have a check to see if there's anything else I can suggest.

[smithp35]

Suggestions for addition:
Assuming it has made the release, this is a potentially breaking change for some people.

• [ELF] Error for executable .note.GNU-stack unless -z execstack or -r #124068 Error for executable .note.GNU-stack unless -z execstack or -r

Not strictly a breaking change, but worth highlighting.

• [LLD] Deprecate --lto-basic-block-sections=labels ([LLD] Deprecate --lto-basic-block-sections=labels #110697) This option is now replaced by --lto-basic-block-address-map.

[MaskRay]

Suggestions for addition: Assuming it has made the release, this is a potentially breaking change for some people.

• [ELF] Error for executable .note.GNU-stack unless -z execstack or -r #124068 Error for executable .note.GNU-stack unless -z execstack or -r

Not strictly a breaking change, but worth highlighting.

• [LLD] Deprecate --lto-basic-block-sections=labels ([LLD] Deprecate --lto-basic-block-sections=labels #110697) This option is now replaced by --lto-basic-block-address-map.

Thanks for the suggestion! Added the two items.

[MaskRay]

(release/20.x will be created less one day. Likely this doesn't need more updates. Landing now.)

[smithp35]

Apologies had to leave the office before I saw the update. LGTM in post.