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author | Rui Ueyama <ruiu@google.com> | 2016-08-18 00:43:02 +0000 |
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committer | Rui Ueyama <ruiu@google.com> | 2016-08-18 00:43:02 +0000 |
commit | c7a55d7ac556f002f12e605aefd6d89f55de9d25 (patch) | |
tree | 4e393fb70a450154c80755c05bbdf714deab3bda | |
parent | 006e15048266055de46ba2b36583cf3b1f66a877 (diff) |
Update release notes.
git-svn-id: https://llvm.org/svn/llvm-project/lld/branches/release_39@279018 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | docs/ReleaseNotes.rst | 71 |
1 files changed, 64 insertions, 7 deletions
diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst index a257676cd..2f3ecf79b 100644 --- a/docs/ReleaseNotes.rst +++ b/docs/ReleaseNotes.rst @@ -16,26 +16,83 @@ 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 -================================================= +What's new in ELF Support? +========================== -ELF Improvements +Link-Time Optimization +---------------------- + +Initial support for LTO has been added. It is compatible with `the +LLVM gold plugin <http://llvm.org/docs/GoldPlugin.html>` in terms of +command line flags and input file format so that LLD is usable as a +drop-in replacement for GNU gold. LTO is implemented as a native +feature unlike the GNU gold's plugin mechanism. + +Identical Code Folding +---------------------- + +LLD 3.9 can now merge identical code sections to produce smaller +output files. It is expected to be used with ``-ffunction-sections``. + +Symbol Versioning +----------------- + +LLD 3.9 is able to link against versioned symbols as well as produce +versioned symbols. Both the original Sun's symbol versioning scheme +and the GNU extension are supported. + +New Targets +----------- + +LLD has expanded support for new targets, including ARM/Thumb, the x32 +ABI and MIPS N64 ABI, in addition to the existing support for x86, +x86-64, MIPS, PowerPC and PPC64. + +TLS Relocation Optimizations +---------------------------- + +The ELF ABI specification of the thread-local variable define a few +peephole optimizations linkers can do by rewriting instructions at the +link-time to reduce run-time overhead to access TLS variables. That +feature has been implemented. + +New Linker Flags ---------------- -* Initial support for LTO. +Many command line options have been added in this release, including: + +- Symbol resolution and output options: ``-Bsymbolic-functions``, + ``-export-dynamic-symbol``, ``-image-base``, ``-pie``, ``-end-lib``, + ``-start-lib``, ``-build-id={md5,sha1,none,0x<hexstring>}``. + +- Symbol versioning option: ``-dynamic-list``. + +- LTO options: ``-lto-O``, ``-lto-aa-pipeline``, ``-lto-jobs``, + ``-lto-newpm-passes``, ``-plugin``, ``-plugin-eq``, ``-plugin-opt``, + ``-plugin-opt-eq``, ``-disable-verify``, ``-mllvm``. + +- Driver optionss: ``-help``, ``-version``, ``-unresolved-symbols``. + +- Debug options: ``-demangle``, ``-reproduce``, ``-save-temps``, + ``-strip-debug``, ``-trace``, ``-trace-symbol``, + ``-warn-execstack``. + +- Exception handling option: ``-eh-frame-hdr``. + +- Identical Code Folding option: ``-icf``. Changes to the MIPS Target -~~~~~~~~~~~~~~~~~~~~~~~~~~ +-------------------------- * Added support for MIPS N64 ABI. * Added support for TLS relocations for both O32 and N64 MIPS ABIs. COFF Improvements ------------------ +================= * Item 1. MachO Improvements ------------------- +================== * Item 1. |