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lld 14.0.0 Release Notes
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========================
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.. contents::
:local:
.. warning::
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These are in-progress notes for the upcoming LLVM 14.0.0 release.
Don't try to link to the 4.0 release notes llvm-svn: 294659
2017-02-10 07:27:17 +08:00
Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
============
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This document contains the release notes for the lld linker, release 14.0.0.
ReleaseNotes: user lower-case for lld in the text llvm-svn: 325869
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Here we describe the status of lld, including major improvements
from the previous release. All lld releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
=================================================
ELF Improvements
----------------
[ELF] Add -Bsymbolic-non-weak-functions This option is a subset of -Bsymbolic-functions. It applies to STB_GLOBAL STT_FUNC definitions. The address of a vague linkage function (STB_WEAK STT_FUNC, e.g. an inline function, a template instantiation) seen by a -Bsymbolic-functions linked shared object may be different from the address seen from outside the shared object. Such cases are uncommon. (ELF/Mach-O programs may use `-fvisibility-inlines-hidden` to break such pointer equality. On Windows, correct dllexport and dllimport are needed to make pointer equality work. Windows link.exe enables /OPT:ICF by default so different inline functions may have the same address.) ``` // a.cc -> a.o -> a.so (-Bsymbolic-functions) inline void f() {} void *g() { return (void *)&f; } // b.cc -> b.o -> exe // The address is different! inline void f() {} ``` -Bsymbolic-non-weak-functions is a safer (C++ conforming) subset of -Bsymbolic-functions, which can make such programs work. Implementations usually emit a vague linkage definition in a COMDAT group. We could detect the group (with more code) but I feel that we should just check STB_WEAK for simplicity. A weak definition will thus serve as an escape hatch for rare cases when users want interposition on definitions. GNU ld feature request: https://sourceware.org/bugzilla/show_bug.cgi?id=27871 Longer write-up: https://maskray.me/blog/2021-05-16-elf-interposition-and-bsymbolic If Linux distributions migrate to protected non-vague-linkage external linkage functions by default, the linker option can still be handy because it allows rapid experiment without recompilation. Protected function addresses currently have deep issues in GNU ld. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D102570
2021-07-30 05:46:53 +08:00
* ``-Bsymbolic-non-weak-functions`` has been added as a ``STB_GLOBAL`` subset of ``-Bsymbolic-functions``.
(`D102570 <https://reviews.llvm.org/D102570>`_)
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[ELF] Add convenience TableGen classes to enforce two dashes for options not supported by GNU ld Announced on https://lists.llvm.org/pipermail/llvm-dev/2020-May/141416.html For many options, we have to support either one or two dash to be compatible with GNU ld. For newer and lld specific options, we can enforce strict double dashes. Affected options: * --thinlto-* * --lto-* * --shuffle-sections= This patch does not change `-plugin-opt=*` because clang driver passes `-plugin-opt=*` and I don't intend to cause churn. In 2000, GNU ld tried something similar with --omagic https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e4897a3288f37d5f69e8acd256a6e83e607fe8d8 Reviewed By: tejohnson, psmith Differential Revision: https://reviews.llvm.org/D79371
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Breaking changes
----------------
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* ...
[ELF] Add convenience TableGen classes to enforce two dashes for options not supported by GNU ld Announced on https://lists.llvm.org/pipermail/llvm-dev/2020-May/141416.html For many options, we have to support either one or two dash to be compatible with GNU ld. For newer and lld specific options, we can enforce strict double dashes. Affected options: * --thinlto-* * --lto-* * --shuffle-sections= This patch does not change `-plugin-opt=*` because clang driver passes `-plugin-opt=*` and I don't intend to cause churn. In 2000, GNU ld tried something similar with --omagic https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e4897a3288f37d5f69e8acd256a6e83e607fe8d8 Reviewed By: tejohnson, psmith Differential Revision: https://reviews.llvm.org/D79371
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COFF Improvements
-----------------
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[docs] Mention some notable feature in the release notes Differential Revision: https://reviews.llvm.org/D52908 llvm-svn: 343878
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MinGW Improvements
------------------
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MachO Improvements
------------------
* Item 1.
[WebAssembly] Initial support for shared objects (-shared) Based on the initial spec proposal: https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md The llvm/codegen side of this is still missing but I believe this change is still worth landing as an incremental step Differential Revision: https://reviews.llvm.org/D54249 llvm-svn: 346918
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WebAssembly Improvements
------------------------