Revision as of 05:56, 11 May 2024

Haskell GHC 9.6 and Stackage LTS 22

Summary

Update the GHC Haskell compiler from major version 9.4 to 9.6 and Haskell packages from Stackage LTS 21 to LTS 22 versions.

Owner

Name: Jens Petersen
Email: <petersen@redhat.com>

Current status

Targeted release: Fedora Linux 41
Last updated: 2024-05-11
Announced
Discussion thread
FESCo issue: #3133
Tracker bug: #2258070
Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

For Fedora 41, the main GHC Haskell compiler package will be updated from version 9.4.5 to the latest stable 9.6.5 or newer bugfix release (rebasing the ghc package with the ghc9.6 package). Along with this, Haskell packages in Stackage (the stable Haskell source package distribution) will be updated from the versions in LTS 21 to latest LTS 22 release. Haskell packages not in Stackage will be updated to the latest appropriate version in the upstream Hackage package repository.

Feedback

Benefit to Fedora

Fedora users will have the latest stable Haskell compiler release, package tools, and current Haskell packages from latest Stackage LTS.

GHC 9.6.5 is the latest current stable version of GHC with various enhancements and fixes (see the release notes linked in the Documentation section for more details about new features and improvements in 9.6).

Scope

Proposal owners:
- update rawhide ghc9.4 is build against itself
- rebase ghc to 9.6.5
- refresh packagings with the latest cabal-rpm release if needed
- update packages to latest Stackage LTS 22 versions using cabal-rpm
- build all the packages in a Koji sidetag repo in dependency order using fbrnch
- push the sidetag through Bodhi to rawhide
- deal with obsoleting ghc9.6 if needed

Other developers: no actions should be needed

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: N/A

Upgrade/compatibility impact

Any dropped packages will have obsoletes added. Otherwise there should not be any direct upgrade impact.

Users' Haskell projects will get built with ghc-9.6 when they next build them and might need some minor code tweaks (see the release notes linked below).

How To Test

install ghc and cabal-install
install pandoc, ShellCheck, ghcid, git-annex, hadolint, stack, xmonad, Agda
install ghc-*-devel or ghc-*-prof or ghc-*-doc
cabal-rpm builddep <favouritepackage>; cabal install <favouritepackage>
install ghc8.10, ghc9.0, ghc9.2, ghc9.4, or ghc*devel
test upgrades of F40 Haskell packages to F41

User Experience

Users will have the most recent stable major version of ghc and Haskell libraries and tools available to them. This makes it easier to build the latest versions of Haskell projects.

In particular cabal-install will also be updated from 3.8 to 3.10, pandoc will be updated to 3.1, and stack to 2.13.

Dependencies

Contingency Plan

Contingency mechanism:
- Change owner will drop the new builds and revert dist-git back to the versions in F39
Contingency deadline: Beta Freeze
Blocks release? No

Documentation

https://downloads.haskell.org/~ghc/9.6.5/docs/html/users_guide/9.6.1-notes.html

Release Notes

@@ Line 44: / Line 44: @@
 == Detailed Description ==
-For Fedora 40, the main [https://www.haskell.org/ghc/ GHC] Haskell compiler package will be updated from version [https://www.haskell.org/ghc/download_ghc_9_4_5.html 9.4.5] to the latest stable [https://www.haskell.org/ghc/download_ghc_9_6_4.html 9.6.4] or newer bugfix release (rebasing the [https://src.fedoraproject.org/rpms/ghc/ ghc] package with the [https://src.fedoraproject.org/rpms/ghc9.6/ ghc9.6] package).
+For Fedora 41, the main [https://www.haskell.org/ghc/ GHC] Haskell compiler package will be updated from version [https://www.haskell.org/ghc/download_ghc_9_4_5.html 9.4.5] to the latest stable [https://www.haskell.org/ghc/download_ghc_9_6_5.html 9.6.5] or newer bugfix release (rebasing the [https://src.fedoraproject.org/rpms/ghc/ ghc] package with the [https://src.fedoraproject.org/rpms/ghc9.6/ ghc9.6] package).
 Along with this, Haskell packages in [https://www.stackage.org Stackage] (the stable Haskell source package distribution) will be updated from the versions in [https://www.stackage.org/lts-21 LTS 21] to latest [https://www.stackage.org/lts-22 LTS 22] release.
 Haskell packages not in Stackage will be updated to the latest appropriate version in the upstream [https://hackage.haskell.org Hackage] package repository.
@@ Line 54: / Line 54: @@
 Fedora users will have the latest stable Haskell compiler release, package tools, and current Haskell packages from latest Stackage LTS.
-GHC 9.6.4 is the latest current stable version of GHC with various enhancements and fixes (see the release notes linked in the Documentation section for more details about new features and improvements in 9.6).
+GHC 9.6.5 is the latest current stable version of GHC with various enhancements and fixes (see the release notes linked in the Documentation section for more details about new features and improvements in 9.6).
 == Scope ==
 * Proposal owners:
 ** update rawhide ghc9.4 is build against itself
-** rebase ghc to 9.6.4
+** rebase ghc to 9.6.5
 ** refresh packagings with the latest cabal-rpm release if needed
 ** update packages to latest [https://www.stackage.org/lts-22 Stackage LTS 22] versions using cabal-rpm
@@ Line 94: / Line 94: @@
 * cabal-rpm builddep <favouritepackage>; cabal install <favouritepackage>
 * install ghc8.10, ghc9.0, ghc9.2, ghc9.4, or ghc*devel
-* test upgrades of F39 Haskell packages to F40
+* test upgrades of F40 Haskell packages to F41
 == User Experience ==
@@ Line 118: / Line 118: @@
 == Documentation ==
-* https://downloads.haskell.org/~ghc/9.6.4/docs/html/users_guide/9.6.1-notes.html
+* https://downloads.haskell.org/~ghc/9.6.5/docs/html/users_guide/9.6.1-notes.html
 == Release Notes ==

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