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List:       fedora-devel-list
Subject:    Fedora 33 Self-Contained Change proposal: GHC 8.8 and Haskell Stackage LTS 16
From:       Ben Cotton <bcotton () redhat ! com>
Date:       2020-06-26 14:42:18
Message-ID: CA+voJeWeMRzyfUjewmLgKVmkJEGSF7Dj-M-mk39pie3RKK6KTA () mail ! gmail ! com
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https://fedoraproject.org/wiki/Changes/GHC_8.8_and_LTS16

== Summary ==
The GHC Haskell compiler will be updated from major version 8.6 to 8.8,
and Haskell packages will be updated from Stackage LTS 14 to LTS 16 versions.

== Owner ==
* Name: [[User:Petersen| Jens Petersen]]
* Email: <petersen@redhat.com>

== Detailed Description ==
For Fedora 33, the GHC Haskell compiler will be updated from version
8.6.5 to 8.8.3 (based on the ghc:8.8 module stream).
Along with this Haskell packages in [https://www.stackage.org
Stackage] will be updated from the versions in LTS 14 to LTS 16.
Haskell packages not in Stackage will be updated to the latest current
version in [https://hackage.haskell.org Hackage].

== Benefit to Fedora ==
Fedora users will benefit from access to the latest stable Haskell
compiler release, package tools, and current stable Haskell packages
from Stackage LTS.

GHC 8.8 features a new code layout algorithm for x86, the final
implementation of the MonadFail proposal, and also many bugfixes (see
the Documentation links for more details).

== Scope ==
* Proposal owners:
** rebase ghc to 8.8.3
** update ghc-rpm-macros to the final version for F33 GA
** refresh packagings with the latest cabal-rpm release
** update packages to latest Stackage LTS 16 versions using cabal-rpm
** build all the packages in a Koji sidetag repo in dependency order
** When finished push all builds through Bodhi to Rawhide before the
mass rebuild
* Other developers: N/A (not a System Wide Change)
* Release engineering: N/A
* Policies and guidelines: N/A (not a System Wide Change)
* Trademark approval: N/A (not needed for this Change)

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

Users' Haskell projects will get rebuilt with ghc-8.8 when they next
build them and might need minor adjustments.

== How To Test ==
* install ghc and cabal-install
* install pandoc, ShellCheck, git-annex
* install ghc-*-devel or ghc-*-prof or ghc-*-doc
* cabal-rpm builddep <favouritepackage>; cabal install <favouritepackage>
* test upgrades of F32 packages to F33

== 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.

Also these updates include a major new version 3 of the Haskell
`Cabal` library and `cabal-install` packaging tool
with important new features and enhancements, and `stack` is being
updated from 2.1 to 2.3.

== Dependencies ==
N/A (not a System Wide Change)

== Contingency Plan ==

* Contingency mechanism: (What to do?  Who will do it?)
** Change owner will drop the new builds and revert back to the versions in F32.
* Contingency deadline: N/A (not a System Wide Change)
* Blocks release? N/A (not a System Wide Change)

== Documentation ==
* https://downloads.haskell.org/~ghc/8.8.3/docs/html/users_guide/8.8.1-notes.html
* https://hackage.haskell.org/package/cabal-install-3.0.0.0/changelog
* https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/8.8

-- 
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
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