lld 20.0.0git Release Notes

Warning

These are in-progress notes for the upcoming LLVM 20.0.0git release. Release notes for previous releases can be found on the Download Page.

Introduction

This document contains the release notes for the lld linker, release 20.0.0git. 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.

Non-comprehensive list of changes in this release

ELF Improvements

• -z nosectionheader has been implemented to omit the section header table. The operation is similar to llvm-objcopy --strip-sections. (#101286)

• Section CLASS linker script syntax binds input sections to named classes, which are referenced later one or more times. This provides access to the automatic spilling mechanism of –enable-non-contiguous-regions without globally changing the semantics of section matching. It also independently increases the expressive power of linker scripts. (#95323)

Breaking changes

COFF Improvements

• /includeglob has been implemented to match the behavior of --undefined-glob available for ELF.

• /lldsavetemps allows saving select intermediate LTO compilation results (e.g. resolution, preopt, promote, internalize, import, opt, precodegen, prelink, combinedindex).

• /machine:arm64ec support completed, enabling the linking of ARM64EC images.

• COFF weak anti-dependency alias symbols are now supported.

MinGW Improvements

• --undefined-glob is now supported by translating into the /includeglob flag.

MachO Improvements

WebAssembly Improvements

Fixes