Author: Fangrui Song Date: 2022-02-14T11:13:11-08:00 New Revision: 2f23d4b0ac0aba4629fa484264b4e5b52bf774ca
URL: https://github.com/llvm/llvm-project/commit/2f23d4b0ac0aba4629fa484264b4e5b52bf774ca DIFF: https://github.com/llvm/llvm-project/commit/2f23d4b0ac0aba4629fa484264b4e5b52bf774ca.diff LOG: ReleaseNotes: add lld/ELF notes For the release/14.x branch. Differential Revision: https://reviews.llvm.org/D119318 Added: Modified: lld/docs/ReleaseNotes.rst Removed: ################################################################################ diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst index f611da428a8fe..ed4a374d579a3 100644 --- a/lld/docs/ReleaseNotes.rst +++ b/lld/docs/ReleaseNotes.rst @@ -30,30 +30,78 @@ ELF Improvements (`D107317 <https://reviews.llvm.org/D107317>`_) * ``--why-extract`` has been added to query why archive members/lazy object files are extracted. (`D109572 <https://reviews.llvm.org/D109572>`_) -* ``e_entry`` no longer falls back to the address of ``.text`` if the entry symbol does not exist. - Instead, a value of 0 will be written. - (`D110014 <https://reviews.llvm.org/D110014>`_) * If ``-Map`` is specified, ``--cref`` will be printed to the specified file. (`D114663 <https://reviews.llvm.org/D114663>`_) +* ``-z bti-report`` and ``-z cet-report`` are now supported. + (`D113901 <https://reviews.llvm.org/D113901>`_) +* ``--lto-pgo-warn-mismatch`` has been added. + (`D104431 <https://reviews.llvm.org/D104431>`_) +* Archives without an index (symbol table) are now supported and work with + ``--warn-backrefs``. One may build such an archive with ``llvm-ar rcS + [--thin]`` to save space. + (`D117284 <https://reviews.llvm.org/D117284>`_) + The archive index may be `entirely ignored <https://reviews.llvm.org/D119074>` + in a future release. * No longer deduplicate local symbol names at the default optimization level of ``-O1``. This results in a larger ``.strtab`` (usually less than 1%) but a faster link - time. Use optimization level ``-O2`` to restore the deduplication. + time. Use optimization level ``-O2`` to restore the deduplication. The ``-O2`` + deduplication may be dropped in the future to help parallel ``.symtab`` write. +* In relocatable output, relocations to discarded symbols now use tombstone + values. + (`D116946 <https://reviews.llvm.org/D116946>`_) +* Orphan section placement now picks a more suitable segment. Previously the + algorithm might pick a readonly segment for a writable orphan section and make + the segment writable. + (`D111717 <https://reviews.llvm.org/D111717>`_) +* An empty output section moved by an ``INSERT`` comment now gets appropriate + flags. + (`D118529 <https://reviews.llvm.org/D118529>`_) +* Negation in a memory region attribute is now correctly handled. + (`D113771 <https://reviews.llvm.org/D113771>`_) +* ``--compress-debug-sections=zlib`` is now run in parallel. ``{clang,gcc} -gz`` link + actions are significantly faster. + (`D117853 <https://reviews.llvm.org/D117853>`_) +* "relocation out of range" diagnostics and a few uncommon diagnostics + now report an object file location beside a source file location. + (`D112518 <https://reviews.llvm.org/D117853>`_) +* The write of ``.rela.dyn`` and ``SHF_MERGE|SHF_STRINGS`` sections (e.g. + ``.debug_str``) is now run in parallel. Architecture specific changes: +* The AArch64 port now supports adrp+ldr and adrp+add optimizations. + ``--no-relax`` can suppress the optimization. + (`D112063 <https://reviews.llvm.org/D112063>`_) + (`D117614 <https://reviews.llvm.org/D117614>`_) * The x86-32 port now supports TLSDESC (``-mtls-dialect=gnu2``). (`D112582 <https://reviews.llvm.org/D112582>`_) * The x86-64 port now handles non-RAX/non-adjacent ``R_X86_64_GOTPC32_TLSDESC`` and ``R_X86_64_TLSDESC_CALL`` (``-mtls-dialect=gnu2``). (`D114416 <https://reviews.llvm.org/D114416>`_) +* The x86-32 and x86-64 ports now support mixed TLSDESC and TLS GD, i.e. mixing + objects compiled with and without ``-mtls-dialect=gnu2`` referencing the same + TLS variable is now supported. + (`D114416 <https://reviews.llvm.org/D114416>`_) * For x86-64, ``--no-relax`` now suppresses ``R_X86_64_GOTPCRELX`` and ``R_X86_64_REX_GOTPCRELX`` GOT optimization (`D113615 <https://reviews.llvm.org/D113615>`_) +* ``R_X86_64_PLTOFF64`` is now supported. + (`D112386 <https://reviews.llvm.org/D112386>`_) +* ``R_AARCH64_NONE``, ``R_PPC_NONE``, and ``R_PPC64_NONE`` in input REL + relocation sections are now supported. Breaking changes ---------------- -* ... +* ``e_entry`` no longer falls back to the address of ``.text`` if the entry symbol does not exist. + Instead, a value of 0 will be written. + (`D110014 <https://reviews.llvm.org/D110014>`_) +* ``--lto-pseudo-probe-for-profiling`` has been removed. In LTO, the compiler + enables this feature automatically. + (`D110209 <https://reviews.llvm.org/D110209>`_) +* Use of ``--[no-]define-common``, ``-d``, ``-dc``, and ``-dp`` will now get a + warning. They will be removed or ignored in 15.0.0. + (`llvm-project#53660 <https://github.com/llvm/llvm-project/issues/53660>`_) COFF Improvements ----------------- _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
