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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://nixos.org/manual/nixpkgs/unstable/#haskell | Current PR: https://github.com/nixos/nixpkgs/pulls?q=is%3Apr+is%3Aopen+head%3Ahaskell-updates | Maintainer Docs: https://github.com/NixOS/nixpkgs/blob/haskell-updates/pkgs/development/haskell-modules/HACKING.md | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org | Merger Schedule: https://cloud.maralorn.de/apps/calendar/p/H6migHmKX7xHoTFa/dayGridMonth/now | Join #haskell.nix:libera.chat for question about the alternative haskell.nix infrastructure141 Servers

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15 Sep 2025
@emilazy:matrix.orgemilyyeah I would prefer a moratorium on adding more GCC 13 at this point :P13:50:47
@emilazy:matrix.orgemilyit's not hard to adapt stuff to newer versions13:50:54
@emilazy:matrix.orgemilyjust slightly tedious sometimes13:50:59
@alex:tunstall.xyzAlex
In reply to @emilazy:matrix.org
it's not hard to adapt stuff to newer versions

This one's non-trivial... Actually something wrong with Hugs' version of base IIRC (maybe a slightly less old base could be patched in?)

ERROR "libraries/bootlib/Foreign/C/Types.hs":173 - Undefined type constructor "NotReallyAType"

13:54:22
@Ericson2314:matrix.orgJohn EricsonOo Haven caught up in all of this, but I like where things are going 13:54:21
@Ericson2314:matrix.orgJohn Ericson*haven't 13:54:25
@emilazy:matrix.orgemilythis is at runtime?13:55:12
@emilazy:matrix.orgemilysmells like latent UB in Hugs that's getting exposed13:55:23
@alex:tunstall.xyzAlexNope, build time.13:55:29
@emilazy:matrix.orgemilybut that's not C13:55:39
@emilazy:matrix.orgemilyI mean it's Hugs outputting that right13:55:50
@emilazy:matrix.orgemilyso it's Hugs runtime13:55:55
@alex:tunstall.xyzAlex The NotReallyAType comes from base's autoconf script somehow not finding the corresponding Haskell type for a few C types. 13:56:31
@emilazy:matrix.orgemilyI see13:58:14
@emilazy:matrix.orgemilyprobably there are new warnings/errors in GCC confusing it13:58:32
@emilazy:matrix.orgemilythat happens a lot in autoconf13:58:41
@emilazy:matrix.orgemilycheck config.log13:58:43
@emilazy:matrix.orgemilyyou'll probably see some ancient looking C program that needs adapting13:58:56
@emilazy:matrix.orgemily you should of course autoreconfHook and get it on latest autotools 13:59:10
@alex:tunstall.xyzAlexThanks for the advice. I'll take a look when I get to work on the PRs.14:05:39
@bglgwyng:matrix.orgbglgwyngI realized that I diagnosed the issue wrong15:02:06

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