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Diffstat (limited to 'docs/ReleaseNotes.rst')
| -rw-r--r-- | docs/ReleaseNotes.rst | 82 |
1 files changed, 69 insertions, 13 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst index e7ea0c8845fd..d07ce1cd85f3 100644 --- a/docs/ReleaseNotes.rst +++ b/docs/ReleaseNotes.rst @@ -5,17 +5,12 @@ LLD 6.0.0 Release Notes .. contents:: :local: -.. warning:: - These are in-progress notes for the upcoming LLVM 6.0.0 release. - Release notes for previous releases can be found on - `the Download Page <http://releases.llvm.org/download.html>`_. - Introduction ============ -This document contains the release notes for the LLD linker, release 6.0.0. -Here we describe the status of LLD, including major improvements -from the previous release. All LLD releases may be downloaded +This document contains the release notes for the lld linker, release 6.0.0. +Here we describe the status of lld, including major improvements +from the previous release. All lld releases may be downloaded from the `LLVM releases web site <http://llvm.org/releases/>`_. Non-comprehensive list of changes in this release @@ -24,20 +19,81 @@ Non-comprehensive list of changes in this release ELF Improvements ---------------- -* Item 1. +* A lot of bugs and compatibility issues have been identified and fixed as a + result of people using lld 5.0 as a standard system linker. In particular, + linker script and version script support has significantly improved that + it should be able to handle almost all scripts. + +* A mitigation for Spectre v2 has been implemented. If you pass ``-z + retpolineplt``, lld uses RET instruction instead of JMP instruction in PLT. + The option is available for x86 and x86-64. + +* Identical Code Folding (ICF) now de-duplicates .eh_frame entries, so lld now + generates slightly smaller outputs than before when you pass ``--icf=all``. + +* Analysis for ``--as-needed`` is now done after garbage collection. If garbage + collector eliminates all sections that use some library, that library is + eliminated from DT_NEEDED tags. Previously, the analysis ran before garbage + collection. + +* Size of code segment is now always rounded up to page size to make sure that + unused bytes at end of code segment is filled with trap instructions (such + as INT3) instead of zeros. + +* lld is now able to generate Android-style compact dynamic relocation table. + You can turn on the feature by passing ``--pack-dyn-relocs=android``. + +* Debug information is used in more cases when reporting errors. + +* ``--gdb-index`` gets faster than before. + +* String merging is now multi-threaded, which makes ``-O2`` faster. + +* ``--hash-style=both`` is now default instead of ``--hash-style=sysv`` to + match the behavior of recent versions of GNU linkers. + +* ARM PLT entries automatically use short or long variants. + +* lld can now identify and patch a code sequence that triggers AArch64 errata 843419. + Add ``--fix-cortex-a53-843419`` to enable the feature. + +* lld can now generate thunks for out of range thunks. + +* MIPS port now generates all output dynamic relocations using Elf_Rel format only. + +* Added handling of the R_MIPS_26 relocation in case of N32/N64 ABIs and + generating proper PLT entries. + +* The following options have been added: ``--icf=none`` ``-z muldefs`` + ``--plugin-opt`` ``--no-eh-frame-hdr`` ``--no-gdb-index`` + ``--orphan-handling={place,discard,warn,error}`` + ``--pack-dyn-relocs={none,android}`` ``--no-omagic`` + ``--no-print-gc-sections`` ``--ignore-function-address-equality`` ``-z + retpolineplt`` ``--print-icf-sections`` ``--no-pie`` COFF Improvements ----------------- * A GNU ld style frontend for the COFF linker has been added for MinGW. In MinGW environments, the linker is invoked with GNU ld style parameters; - which LLD previously only supported when used as an ELF linker. When + which lld previously only supported when used as an ELF linker. When a PE/COFF target is chosen, those parameters are rewritten into the lld-link style parameters and the COFF linker is invoked instead. * Initial support for the ARM64 architecture has been added. -MachO Improvements ------------------- +* New ``--version`` flag. + +* Significantly improved support for writing PDB Files. + +* New ``--rsp-quoting`` flag, like ``clang-cl``. + +* ``/manifestuac:no`` no longer incorrectly disables ``/manifestdependency:``. + +* Only write ``.manifest`` files if ``/manifest`` is passed. + +WebAssembly Improvements +------------------------ -* Item 1. +* Initial version of WebAssembly support has landed. You can invoke the + WebAssembly linker by ``wasm-ld``. |
