ReleaseNotes: add lld/ELF notes

[MaskRay]

Summary

For the release/13.x branch.

[MaskRay]

.

[smeenai]

Everything that's added in here LGTM. I haven't been keeping up with LLD enough to say if there's other things worth including as well :)

[jhenderson]

Some grammar suggestions from me. As with @smeenai, I've not been following development closely enough to confirm that these are all the changes that should be documented though.

lld/docs/ReleaseNotes.rst

44

47

53

55

62

I think this is what is meant?

Also should this and the other linker-script related changes have a note saying they are for linker scripts (e.g. in this case "in the linker script output section description ...")?

81

87

89

97

99

[MaskRay]

Appreciate the grammar suggestions :)

lld/docs/ReleaseNotes.rst

62

Also should this and the other linker-script related changes have a note saying they are for linker scripts (e.g. in this case "in the linker script output section description ...")?

Thanks for the suggestion. Applied

[jhenderson]

lld/docs/ReleaseNotes.rst

75

Perhaps worth being specific by what you mean by "quotes". At least in British English, quotes can mean both ' and " (single and double quotes respectively). When just the term "quotes" is mentioned, it can be ambiguous without context.

[MaskRay]

quotes -> double quotes

[MaskRay]

Thanks! Pushed to release/13.x

lld/docs/ReleaseNotes.rst

 from the `LLVM releases web site <https://llvm.org/releases/>`_.
 
 Non-comprehensive list of changes in this release
 =================================================
 
 ELF Improvements
 ----------------
 
+* ``-z start-stop-gc`` is now supported and becomes the default.
+  (`D96914 <https://reviews.llvm.org/D96914>`_)
+  (`rG6d2d3bd0 <https://reviews.llvm.org/rG6d2d3bd0a61f5fc7fd9f61f48bc30e9ca77cc619>`_)
+* ``--shuffle-sections=<seed>`` has been changed to ``--shuffle-sections=<section-glob>=<seed>``.
+  If seed is -1, the matched input sections are reversed.
+  (`D98445 <https://reviews.llvm.org/D98445>`_)
+  (`D98679 <https://reviews.llvm.org/D98679>`_)
 * ``-Bsymbolic -Bsymbolic-functions`` has been changed to behave the same as ``-Bsymbolic-functions``. This matches GNU ld.
   (`D102461 <https://reviews.llvm.org/D102461>`_)
 * ``-Bno-symbolic`` has been added.
   (`D102461 <https://reviews.llvm.org/D102461>`_)
 * A new linker script command ``OVERWRITE_SECTIONS`` has been added.
   (`D103303 <https://reviews.llvm.org/D103303>`_)
 * ``-Bsymbolic-non-weak-functions`` has been added as a ``STB_GLOBAL`` subset of ``-Bsymbolic-functions``.
   (`D102570 <https://reviews.llvm.org/D102570>`_)
+* ``--no-allow-shlib-undefined`` has been improved to catch more cases.
+  (`D101996 <https://reviews.llvm.org/D101996>`_)
+* ``__rela_iplt_start`` is no longer defined for -pie/-shared.
+  This makes GCC/Clang ``-static-pie`` built executables work.
+  (`rG8cb78e99 <https://reviews.llvm.org/rf8cb78e99aae9aa3f89f7bfe667db2c5b767f21f>`_)
+* IRELATIVE/TLSDESC relocations now support ``-z rel``.
+  (`D100544 <https://reviews.llvm.org/D100544>`_)
+* Section groups with a zero flag are now supported.
+  This is used by ``comdat nodeduplicate`` in LLVM IR.
+  (`D96636 <https://reviews.llvm.org/D96636>`_)
+  (`D106228 <https://reviews.llvm.org/D106228>`_)
+* Defined symbols are now resolved before undefined symbols to stabilize the bheavior of archive member extraction.
+  (`D95985 <https://reviews.llvm.org/D95985>`_)
+* ``STB_WEAK`` symbols are now preferred over COMMON symbols as a fix to a ``--fortran-common`` regression.
+  (`D105945 <https://reviews.llvm.org/D105945>`_)
+* Absolute relocations referencing undef weak now produce dynamic relocations for -pie, matching GOT-generating relocations.
+  (`D105164 <https://reviews.llvm.org/D105164>`_)
+* Exported symbols are now communicated to the LTO library so as to make LTO
+  based whole program devirtualization (``-flto=thin -fwhole-program-vtables``)
+  work with shared objects.
+  (`D91583 <https://reviews.llvm.org/D91583>`_)
+* Whole program devirtualization now respects ``local:`` version nodes in a version script.
+  (`D98220 <https://reviews.llvm.org/D98220>`_)
+  (`D98686 <https://reviews.llvm.org/D98686>`_)
+* ``local:`` version nodes in a version script now apply to non-default version symbols.
+  (`D107234 <https://reviews.llvm.org/D107234>`_)
+* If an object file defines both ``foo`` and ``foo@v1``, now only ``foo@v1`` will be in the output.
+  (`D107235 <https://reviews.llvm.org/D107235>`_)
+* Copy relocations on non-default version symbols are now supported.
+  (`D107535 <https://reviews.llvm.org/D107535>`_)
+
+Linker script changes:
+
+* ``.``, ``$``, and double quotes can now be used in symbol names in expressions.
+  (`D98306 <https://reviews.llvm.org/D98306>`_)
+  (`rGe7a7ad13 <https://reviews.llvm.org/rGe7a7ad134fe182aad190cb3ebc441164470e92f5>`_)
+* Fixed value of ``.`` in the output section description of ``.tbss``.
+  (`D107288 <https://reviews.llvm.org/D107288>`_)
+* ``NOLOAD`` sections can now be placed in a ``PT_LOAD`` program header.
+  (`D103815 <https://reviews.llvm.org/D103815>`_)
+* ``OUTPUT_FORMAT(default, big, little)`` now consults ``-EL`` and ``-EB``.
+  (`D96214 <https://reviews.llvm.org/D96214>`_)
+* The ``OVERWRITE_SECTIONS`` command has been added.
+  (`D103303 <https://reviews.llvm.org/D103303>`_)
+* The section order within an ``INSERT AFTER`` command is now preserved.
+  (`D105158 <https://reviews.llvm.org/D105158>`_)
+
+Architecture specific changes:
+
+* aarch64_be is now supported.
+  (`D96188 <https://reviews.llvm.org/D96188>`_)
+* The AMDGPU port now supports ``--amdhsa-code-object-version=4`` object files;
+  (`D95811 <https://reviews.llvm.org/D95811>`_)
+* The ARM port now accounts for PC biases in range extension thunk creation.
+  (`D97550 <https://reviews.llvm.org/D97550>`_)
+* The AVR port now computes ``e_flags``.
+  (`D99754 <https://reviews.llvm.org/D99754>`_)
+* The Mips port now omits unneeded dynamic relocations for PIE non-preemptible TLS.
+  (`D101382 <https://reviews.llvm.org/D101382>`_)
+* The PowerPC port now supports ``--power10-stubs=no`` to omit Power10 instructions from call stubs.
+  (`D94625 <https://reviews.llvm.org/D94625>`_)
+* Fixed a thunk creation bug in the PowerPC port when TOC/NOTOC calls are mixed.
+  (`D101837 <https://reviews.llvm.org/D101837>`_)
+* The RISC-V port now resolves undefined weak relocations to the current location if not using PLT.
+  (`D103001 <https://reviews.llvm.org/D103001>`_)
+* ``R_386_GOTOFF`` relocations from .debug_info are now allowed to be compatible with GCC.
+  (`D95994 <https://reviews.llvm.org/D95994>`_)
+* ``gotEntrySize`` has been added to improve support for the ILP32 ABI of x86-64.
+  (`D102569 <https://reviews.llvm.org/D102569>`_)
 
 Breaking changes
 ----------------
 
 * ``--shuffle-sections=<seed>`` has been changed to ``--shuffle-sections=<section-glob>=<seed>``.
   Specify ``*`` as ``<section-glob>`` to get the previous behavior.
 
 COFF Improvements