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ReleaseNotes: add lld/ELF notes #80393

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Feb 3, 2024
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ReleaseNotes: add lld/ELF notes #80393

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ReleaseNotes: add lld/ELF notes
MaskRay Feb 2, 2024
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MaskRay Feb 2, 2024
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Merge branch 'release/18.x' into 18.x-lld-elf
MaskRay Feb 2, 2024
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34 changes: 34 additions & 0 deletions lld/docs/ReleaseNotes.rst
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Expand Up @@ -29,8 +29,42 @@ ELF Improvements
* ``--fat-lto-objects`` option is added to support LLVM FatLTO.
Without ``--fat-lto-objects``, LLD will link LLVM FatLTO objects using the
relocatable object file. (`D146778 <https://reviews.llvm.org/D146778>`_)
* ``-Bsymbolic-non-weak`` is added to directly bind non-weak definitions.
(`D158322 <https://reviews.llvm.org/D158322>`_)
* ``--lto-validate-all-vtables-have-type-infos``, which complements
``--lto-whole-program-visibility``, is added to disable unsafe whole-program
devirtualization. ``--lto-known-safe-vtables=<glob>`` can be used
to mark known-safe vtable symbols.
(`D155659 <https://reviews.llvm.org/D155659>`_)
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@smithp35 smithp35 Feb 2, 2024 •
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Could be worth adding

* ``--save-temps --lto-emit-asm`` now derives ELF/asm file names from bitcode file names. ld.lld --save-temps a.o d/b.o -o out` will create ELF relocatable files `out.lto.a.o`/`d/out.lto.b.o` instead of `out1.lto.o`/`out2.lto.o`. (`#78835 <https://github.com/llvm/llvm-project/pull/78835>`_)

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Thanks for the suggestion! I noticed this and GOT32_PCREL and was wondering whether they are minor. But your mentioning this made it clear it is worth mentioning:)

This entry may motivate wasm and Mach-O folks to implement a similar change.
(I am actually self motivated to do this if I have some spare time)

* ``--no-allow-shlib-undefined`` now reports errors for DSO referencing
non-exported definitions.
(`#70769 <https://github.com/llvm/llvm-project/pull/70769>`_)
* common-page-size can now be larger than the system page-size.
(`#57618 <https://github.com/llvm/llvm-project/issues/57618>`_)
* When call graph profile information is availablue due to instrumentation or
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sample PGO, input sections are now sorted using the new ``cdsort`` algorithm,
better than the previous ``hfsort`` algorithm.
(`D152840 <https://reviews.llvm.org/D152840>`_)
* Symbol assignments like ``a = DEFINED(a) ? a : 0;`` are now handled.
(`#65866 <https://github.com/llvm/llvm-project/pull/65866>`_)
* ``OVERLAY`` now supports optional start address and LMA
(`#77272 <https://github.com/llvm/llvm-project/pull/77272>`_)
* Relocations referencing a symbol defined in ``/DISCARD/`` section now lead to
an error.
(`#69295 <https://github.com/llvm/llvm-project/pull/69295>`_)
* For AArch64 MTE, global variable descriptors have been implemented.
(`D152921 <https://reviews.llvm.org/D152921>`_)
* ``R_LARCH_PCREL20_S2``/``R_LARCH_ADD6``/``R_LARCH_CALL36`` and extreme code
model relocations are now supported.
* ``--emit-relocs`` is now supported for RISC-V linker relaxation.
(`D159082 <https://reviews.llvm.org/D159082>`_)
* Call relaxation respects RVC when mixing +c and -c relocatable files.
(`#73977 <https://github.com/llvm/llvm-project/pull/73977>`_)
* ``R_RISCV_SET_ULEB128``/``R_RISCV_SUB_ULEB128`` relocations are now supported.
(`#72610 <https://github.com/llvm/llvm-project/pull/72610>`_)
(`#77261 <https://github.com/llvm/llvm-project/pull/77261>`_)
* RISC-V TLSDESC is now supported.
(`#79239 <https://github.com/llvm/llvm-project/pull/79239>`_)

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@smithp35 smithp35 Feb 2, 2024 •
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Could be worth adding

* R_AARCH64_GOTPCREL32 is now supported. (`#72584 <https://github.com/llvm/llvm-project/pull/72584>`_)

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Good call, as well as R_RISCV_GOT32_PCREL (#72587)

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Thanks for the addition. Added both.

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