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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://haskell4nix.readthedocs.io/143 Servers

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26 Sep 2025
@bglgwyng:matrix.orgbglgwyngyes this worked03:41:00
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@bglgwyng:matrix.orgbglgwyng Where is pkgsHostTarget passed from?
https://github.com/NixOS/nixpkgs/blob/5364a5ff96df5c2e3b1048914f90fc39530087c2/pkgs/development/haskell-modules/generic-builder.nix#L641
09:28:48
@sternenseemann:systemli.orgsternipkgs/stdenv/generic/setup.sh09:51:35
@sternenseemann:systemli.orgsterni yes this also happens in that case, hence you need to overrideScope 09:52:08
@maralorn:maralorn.demaralornA recent ghc version started embedding links to the ghc error index via terminal control codes.14:14:39
@maralorn:maralorn.demaralornThat doesn’t seem to work in nix logs.14:15:07
@maralorn:maralorn.demaralornDoes anyone know how that can be fixed?14:15:23
@maralorn:maralorn.demaralornIf not maybe we should deactivate/strip it?14:15:41
@maralorn:maralorn.demaralorn

Looks like that for me:

<no location info>: warning: [8;;https://errors.haskell.org/messages/GHC-42258GHC-422588;;] [-Wunused-packages]
14:16:36
@alex:tunstall.xyzAlex My guess is that [8;; is some kind of terminal escape code.
Although undesirable, does disabling colours work?
15:03:59
@teoc:matrix.orgteo (they/he)A quick glance at the GHC codebase points me to GHC.Types.Errors where it seems like this is always emitted irrespective of whether you are in a fancy terminal. We probably shouldn't do that15:06:29
@teoc:matrix.orgteo (they/he)Ah wait no it is a setting15:06:50
@teoc:matrix.orgteo (they/he) yeah it determines if your terminal supports colours and only uses it in that case. And you can disable it with fprint-error-index-links=never 15:08:23

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