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doc/haskell: Add GHC deprecation policy

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maralorn 2025-05-21 20:41:53 +02:00 • committed by github-actions[bot]
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doc/languages-frameworks/haskell.section.md
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@ -161,6 +161,27 @@ completely incompatible with packages from `haskellPackages`.
<!-- TODO(@maralorn) Link to package set generation docs in the contributors guide below. -->
### GHC Deprecation Policy {#ghc-deprecation-policy}
We remove GHC versions according to the following policy:
#### Major GHC versions {#major-ghc-deprecation}
We keep the following GHC major versions:
1. The current Stackage LTS as the default and all later major versions.
2. The two latest major versions older than our default.
3. The currently recommended GHCup version and all later major versions.
Older GHC versions might be kept longer, if there are in-tree consumers. We will coordinate with the maintainers of those dependencies to find a way forward.
#### Minor GHC versions {#minor-ghc-deprecation}
Every major version has a default minor version. The default minor version will be updated as soon as viable without breakage.
Older minor versions for a supported major version will only be kept, if they are the last supported version of a major Stackage LTS release.
<!-- Policy introduced here: https://discourse.nixos.org/t/nixpkgs-ghc-deprecation-policy-user-feedback-necessary/64153 -->
## `haskellPackages.mkDerivation` {#haskell-mkderivation}
Every haskell package set has its own haskell-aware `mkDerivation` which is used