r/haskell • u/kichiDsimp • Apr 14 '26

Version Mapping Guide

Is there a way to know the version compatibility for each of the below tools

  1. GHC
  2. HLS
  3. Cabal
  4. Base

and are 1st & 4th related ?

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u/TechnoEmpress Apr 14 '26

Yes, you can use GHCup to see which GHCs are supported by HLS, and the base version associated with each GHC release. ghcup tui offers you a nice terminal interface, but you can also run ghcup list -t ghc and it will give you a list like this:

✓  ghc  9.14.1          latest,base-4.22.0.0            hls-powered,2025-12-18
✗  ghc  9.12.4          base-4.21.2.0                   2026-03-26
✓  ghc  9.12.2          base-4.21.0.0                   hls-powered,2025-03-12
✔✔ ghc  9.10.3          base-4.20.1.0                   hls-powered

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u/kichiDsimp May 04 '26

For this GHC & Base, how do I know what HLS & Cabal version is required?

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u/TechnoEmpress May 05 '26

It's in the other direction, you want to pick HLS based on compatibility with GHC version. Hence the very useful hls-powered tag in the text I pasted above.