F40 Change Proposal: Haskell GHC 9.6 and Stackage LTS 22 (Self-Contained)

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Wiki -> https://fedoraproject.org/wiki/Changes/Haskell_GHC_9.6_and_Stackage_22

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 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: [[User:Petersen| Jens Petersen]]

* Email: <petersen@xxxxxxxxxx>


== 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_3.html
9.6.3] 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.

== 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 9.6.3 is the 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 9.6.3
** 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
** 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: [https://pagure.io/releng/issues #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 F39 Haskell packages to F40

== 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



== Documentation ==
* https://downloads.haskell.org/~ghc/9.6.3/docs/html/users_guide/9.6.1-notes.html


== Release Notes ==



-- 
Aoife Moloney

Fedora Operations Architect

Fedora Project

Matrix: @amoloney:fedora.im

IRC: amoloney
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