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Diffstat (limited to 'docs/ReleaseNotes.rst')
| -rw-r--r-- | docs/ReleaseNotes.rst | 85 |
1 files changed, 68 insertions, 17 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst index 203826a089a7..96fa8e049c34 100644 --- a/docs/ReleaseNotes.rst +++ b/docs/ReleaseNotes.rst @@ -5,18 +5,19 @@ LLD 7.0.0 Release Notes .. contents:: :local: -.. warning:: - These are in-progress notes for the upcoming LLVM 7.0.0 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 7.0.0. -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/>`_. +lld is a high-performance linker that supports ELF (Unix), COFF (Windows), +Mach-O (macOS), MinGW and WebAssembly. lld is command-line-compatible with GNU +linkers and Microsoft link.exe, and is significantly faster than these system +default linkers. + +lld 7 for ELF and COFF are production-ready. lld/ELF can build the entire +FreeBSD/AMD64 and will be the default linker of the next version of the +operating system. lld/COFF is being used to build popular large programs such as +the Chrome web browser. Mach-O, MinGW and WebAssembly supports are still +experimental. Non-comprehensive list of changes in this release ================================================= @@ -24,15 +25,61 @@ Non-comprehensive list of changes in this release ELF Improvements ---------------- -* lld is now able to overcome MIPS GOT entries number limitation - and generate multi-GOT if necessary. +* Fixed a lot of long-tail compatibility issues with GNU linkers. + +* Added ``-z retpolineplt`` to emit a PLT entry that doesn't contain an indirect + jump instruction to mitigate Spectre v2 vulnerability. + +* Added experimental support for `SHT_RELR sections + <https://groups.google.com/forum/#!topic/generic-abi/bX460iggiKg>`_ to create a + compact dynamic relocation table. + +* Added support for `split stacks <https://gcc.gnu.org/wiki/SplitStacks>`_. + +* Added support for address significance table (section with type + SHT_LLVM_ADDRSIG) to improve Identical Code Folding (ICF). Combined with the + ``-faddrsig`` compiler option added to Clang 7, lld's ``--icf=all`` can now + safely merge functions and data to generate smaller outputs than before. + +* Improved ``--gdb-index`` so that it is faster (`r336790 + <https://reviews.llvm.org/rL336790>`_) and uses less memory (`r336672 + <https://reviews.llvm.org/rL336672>`_). + +* Reduced memory usage of ``--compress-debug-sections`` (`r338913 + <https://reviews.llvm.org/rL338913>`_). + +* Added linker script OVERLAY support (`r335714 <https://reviews.llvm.org/rL335714>`_). -* lld is now able to produce MIPS position-independent executable (PIE). +* Added ``--warn-backref`` to make it easy to identify command line option order + that doesn't work with GNU linkers (`r329636 <https://reviews.llvm.org/rL329636>`_) + +* Added ld.lld.1 man page (`r324512 <https://reviews.llvm.org/rL324512>`_). + +* Added support for multi-GOT. + +* Added support for MIPS position-independent executable (PIE). * Fixed MIPS TLS GOT entries for local symbols in shared libraries. -* Fixed calculation of MIPS GP relative relocations - in case of relocatable output. +* Fixed calculation of MIPS GP relative relocations in case of relocatable + output. + +* Added support for PPCv2 ABI. + +* Removed an incomplete support of PPCv1 ABI. + +* Added support for Qualcomm Hexagon ISA. + +* Added the following flags: ``--apply-dynamic-relocs``, ``--check-sections``, + ``--cref``, ``--just-symbols``, ``--keep-unique``, + ``--no-allow-multiple-definition``, ``--no-apply-dynamic-relocs``, + ``--no-check-sections``, ``--no-gnu-unique, ``--no-pic-executable``, + ``--no-undefined-version``, ``--no-warn-common``, ``--pack-dyn-relocs=relr``, + ``--pop-state``, ``--print-icf-sections``, ``--push-state``, + ``--thinlto-index-only``, ``--thinlto-object-suffix-replace``, + ``--thinlto-prefix-replace``, ``--warn-backref``, ``-z combreloc``, ``-z + copyreloc``, ``-z initfirst``, ``-z keep-text-section-prefix``, ``-z lazy``, + ``-z noexecstack``, ``-z relro``, ``-z retpolineplt``, ``-z text`` COFF Improvements ----------------- @@ -45,7 +92,11 @@ COFF Improvements * Improved compatibility of output binaries with GNU binutils objcopy/strip. -MachO Improvements ------------------- +* Sped up PDB file creation. + +* Changed section layout to improve compatibility with link.exe. -* Item 1. +* Added the following flags: ``--color-diagnostics={always,never,auto}``, + ``--no-color-diagnostics``, ``/brepro``, ``/debug:full``, ``/debug:ghash``, + ``/guard:cf``, ``/guard:longjmp``, ``/guard:nolongjmp``, ``/integritycheck``, + ``/order``, ``/pdbsourcepath``, ``/timestamp`` |