Changes/LLVM-18

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LLVM 18

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes process, proposals are publicly announced in order to receive community feedback. This proposal will only be implemented if approved by the Fedora Engineering Steering Committee.

Summary

Update all llvm sub-projects in Fedora Linux to version 17.

Owner

• Name: Tom Stellard
• Email: <tstellar@redhat.com>

Current status

• Targeted release: Fedora Linux 40
• Last updated: 2023-12-15
• [<will be assigned by the Wrangler> devel thread]
• FESCo issue: <will be assigned by the Wrangler>
• Tracker bug: <will be assigned by the Wrangler>
• Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

All llvm sub-projects in Fedora will be updated to version 18, and there will be a soname version change for the llvm libraries. Compatibility packages clang17, llvm17, and lld17 will be added to ensure that packages that currently depend on clang and llvm version 17 libraries will continue to work. These older compatibility packages will be orphaned:

• llvm14
• llvm15
• llvm16
• clang14
• clang15
• clang16
• lld14
• lld15
• lld16

Other notable changes:

• clang will emit DWARF-5 by default instead of DWARF-4. This matches the upstream default. We have been using DWARF-4 as the default for the last few releases due to: https://bugzilla.redhat.com/show_bug.cgi?id=2064052
• [UNCONFIRMED] The compatibility packages will now include the same content as the main package. In previous releases, the compat packages contained only libraries and headers. The binaries and other content was stripped out.
• [UNCONFIRMED] We will be adding an llvm19 package to rawhide which will be used to package periodic snapshots from upstream LLVM. We are also investigating switching to python-like parallel versions for Fedora 41, and if we decided to do this, then llvm19 will become the 'main' llvm package in Fedora 41.
• [UNCONFIRMED] We will be enabling the FAT LTO feature.

Scope

• Proposal owners:

• Other developers:

• Release engineering: #Releng issue number

• Policies and guidelines: N/A (not needed for this Change)

• Trademark approval: N/A (not needed for this Change)

• Alignment with Community Initiatives:

Contingency Plan

• Contingency mechanism: (What to do? Who will do it?) N/A (not a System Wide Change)
• Contingency deadline: N/A (not a System Wide Change)
• Blocks release? N/A (not a System Wide Change), Yes/No

Documentation

N/A (not a System Wide Change)