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D86142 introduced --fortran-common and defaulted it to true (matching GNU ld but deviates from gold/macOS ld64). The default state was motivated by transparently supporting some FORTRAN 77 programs (Fortran 90 deprecated common blocks). Now I think it again. I believe we made a mistake to change the default: * this is a weird and legacy rule, though the breakage is very small * --fortran-common introduced complexity to parallel symbol resolution and will slow down it * --fortran-common more likely causes issues when users mix COMMON and STB_GLOBAL definitions (see https://github.com/llvm/llvm-project/issues/48570 and https://maskray.me/blog/2022-02-06-all-about-common-symbols). I have seen several issues in our internal projects and Android. On the other hand, --no-fortran-common is safer since COMMON/STB_GLOBAL have the same semantics related to archive member extraction. Therefore I think we should switch back, not punishing the common uage. A platform wanting --fortran-common can implement ld.lld as a shell script wrapper around `lld -flavor gnu --fortran-common "$@"`. Reviewed By: ikudrin, sfertile Differential Revision: https://reviews.llvm.org/D122450
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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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* ``-z pack-relative-relocs`` is now available to support ``DT_RELR`` for glibc 2.36+.
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(`D120701 <https://reviews.llvm.org/D120701>`_)
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* ``--no-fortran-common`` (pre 12.0.0 behavior) is now the default.
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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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* If a prevailing COMDAT group defines STB_WEAK symbol, having a STB_GLOBAL symbol in a non-prevailing group is now rejected with a diagnostic.
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(`D120626 <https://reviews.llvm.org/D120626>`_)
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COFF Improvements
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-----------------
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* Added autodetection of MSVC toolchain, a la clang-cl. Also added /winsysroot
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support for explicit specification of MSVC toolchain location.
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(`D118070 <https://reviews.llvm.org/D118070>`_)
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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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