Add more items to lld 6.0 release note

By Rui Ueyama!

Differential Revision: https://reviews.llvm.org/D43670

llvm-svn: 325871

1 files changed, 47 insertions, 22 deletions

diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst
index fb9cd49..d07ce1c 100644
--- a/lld/docs/ReleaseNotes.rst
+++ b/lld/docs/ReleaseNotes.rst
@@ -8,9 +8,9 @@ LLD 6.0.0 Release Notes
 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
@@ -19,40 +19,64 @@ Non-comprehensive list of changes in this release
 ELF Improvements
 ----------------
 
-* MIPS port now generates all output dynamic relocations
-  using Elf_Rel format only.
+* 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.
 
-* Added handling of the R_MIPS_26 relocation in case of N32 / N64 ABIs
-  and generating proper PLT entries.
+* 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.
 
-* lld can patch Aarch64 errata 843419.
+* Identical Code Folding (ICF) now de-duplicates .eh_frame entries, so lld now
+  generates slightly smaller outputs than before when you pass ``--icf=all``.
 
-* lld can generate thunks for out of range thunks.
+* 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.
 
-* ARM PLT entries automatically use short or long variants.
+* 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.
 
-* Lots of bug fixes. Should be able to handle almost all linker and version scripts.
+* ``--gdb-index`` gets faster than before.
 
-* Faster gdb index creation.
+* String merging is now multi-threaded, which makes ``-O2`` faster.
 
-* Tar files created by --reproduce now work even in the presence of absolute paths.
+* ``--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 defaults to --hash-style=both.
+* lld can now identify and patch a code sequence that triggers AArch64 errata 843419.
+  Add ``--fix-cortex-a53-843419`` to enable the feature.
 
-* ICF now deduplicates .eh_frame entries.
+* lld can now generate thunks for out of range thunks.
 
-* LLD supports the Android relocation packing format.
+* MIPS port now generates all output dynamic relocations using Elf_Rel format only.
 
-* Debug info is used in more cases when reporting errors.
+* Added handling of the R_MIPS_26 relocation in case of N32/N64 ABIs and
+  generating proper PLT entries.
 
-* LLD can produce x86/x86_64 PLTs that use retpolines.
+* 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.
 
@@ -68,7 +92,8 @@ COFF Improvements
 
 * Only write ``.manifest`` files if ``/manifest`` is passed.
 
-MachO Improvements
-------------------
+WebAssembly Improvements
+------------------------
 
-* Item 1.
+* Initial version of WebAssembly support has landed. You can invoke the
+  WebAssembly linker by ``wasm-ld``.