ce45c95694
https://maskray.me/blog/2022-02-06-all-about-common-symbols#no-define-common In GNU ld, -dc only affects -r links and causes COMMON symbols to be allocated. --no-define-common is defined to make COMMON symbols undefined for -shared. AIUI --no-define-common is a workaround around glibc 2.1 time and not really useful. gold confuses --define-common with -d/FORCE_COMMON_ALLOCATION and implements --define-common with -d semantics. Its --no-define-common is incompatible with GNU ld. In ld.lld, b2a23cf3c08cee45614f27eb2c6d044e506aa6a6 fixed the default -r behavior for COMMON symbols but ported the incompatible gold --[no-]define-common. To the best of my knowledge, no project uses -dp --[no-]define-common. So just remove these options. -d/-dc are used by the following projects: * grub grub-core/genmod.sh.in uses -Wl,-r,-d (https://lists.gnu.org/archive/html/grub-devel/2022-02/msg00088.html) * FreeBSD crunchgen uses -Wl,-dc (https://reviews.freebsd.org/D34215) A no-op implementation works for them. Only when a program inspects relocatable output by itself and does not recognize COMMON symbols, there may be a problem. This is an extremely unlikely case. Reviewed By: peter.smith Differential Revision: https://reviews.llvm.org/D119108
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===========================
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lld |release| Release Notes
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===========================
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.. contents::
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:local:
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming LLVM |release| release.
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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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============
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This document contains the release notes for the lld linker, release |release|.
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Here we describe the status of lld, including major improvements
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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
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=================================================
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ELF Improvements
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----------------
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Breaking changes
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----------------
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* The GNU ld incompatible ``--no-define-common`` has been removed.
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* The obscure ``-dc``/``-dp`` options have been removed.
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* ``-d`` is now ignored.
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COFF Improvements
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-----------------
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* ...
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MinGW Improvements
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------------------
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* ...
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MachO Improvements
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------------------
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* Item 1.
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WebAssembly Improvements
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------------------------
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