F36 Change: GHC compiler parallel version installs (Self-Contained Change proposal)

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https://fedoraproject.org/wiki/Changes/GHC_parallel_version_installs


== Summary ==
Introduce ghcX.Y packages to Fedora which can be parallel installed,
in addition to the main ghc package.

== Owner ==
* Name: [[User:Petersen|Jens Petersen]]
* Email: petersen@xxxxxxxxxx


== Detailed Description ==
Currently ghc modules are available in Fedora but they cannot be
installed in parallel.
This Change will enable being able to easily install multiple versions
of ghc in parallel,
which can be useful for development - both for working on different projects
and testing projects for compatibility across different ghc versions.

== Feedback ==
This was proposed to the Fedora Haskell mailing list already and so
far there were no objections.

== Benefit to Fedora ==
Parallel installs of ghc versions will allow more flexible Haskell
development using Fedora Linux.

== Scope ==
* Proposal owners:
** update ghc-rpm-macros to support the packaging [done]
** add ghc9.2 [built for rawhide]
** add ghc9.0 [repo created]
** add ghc8.10 [may not be needed for F36]
** add ghc8.8 [stretch goal]
** add cabal-install3.4 and/or cabal-install3.6 [stretch goal]
** also backport ghcX.Y's to F35, F34, and EPEL

* Other developers: N/A
* Release engineering: N/A
* Policies and guidelines: N/A (not needed for this Change)
* Trademark approval: N/A (not needed for this Change)
* Alignment with Objectives: N/A

== Upgrade/compatibility impact ==

These are new packages so upgrading from older releases should be fine.
Eventually future Fedora version upgrades will probably need to
obsolete very old ghcX.Y versions.

== How To Test ==
1. dnf install ghc ghc9.2 ghc9.0

== User Experience ==
Installing ghc, ghc9.0, and ghc9.2 will give you /usr/bin/ghc,
/usr/bin/ghc-9.0.x and /usr/bin/ghc-9.2.x.
Their Haskell libraries will have ghc versioned directories and .so files.

== Dependencies ==
N/A


== 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)


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

== Release Notes ==
With the introduction of versioned ghcX.Y packages multiple versions
of the Haskell GHC compiler can now be installed parallel in the
Fedora Linux.


-- 
Ben Cotton
He / Him / His
Fedora Program Manager
Red Hat
TZ=America/Indiana/Indianapolis
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