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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/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org144 Servers

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29 Jan 2025
@manuelbaerenz:matrix.orgManuel BärenzWhich is particularly confusing because I'm trying to build for GHC 9.413:59:22
@alexfmpe:matrix.orgalexfmpedefault HLS is built with 9.6 no?14:39:15
@alexfmpe:matrix.orgalexfmpeor maybe in this case it's cabal2nix14:39:46
@manuelbaerenz:matrix.orgManuel BärenzYes, but I'm taking care to use HLS from the same GHC that I want to build with. I'll double check whether I've messed that up14:40:14
@maralorn:maralorn.demaralornWell, the chain is this:14:40:25
@maralorn:maralorn.demaralornYou are using cabal2nix, which is taken from the 9.6 package set.14:40:52
@maralorn:maralorn.demaralornUnd your override for mtl invalidates the hadrian for 9.6.14:41:33
@manuelbaerenz:matrix.orgManuel Bärenz But if I do hprev.callCabal2nix (where hprev is the second argument in my haskell packageOverrides), shouldn't that fix it? I've tried that and it doesn't 14:45:09
@maralorn:maralorn.demaralornI have no clue from where callCabal2nix picks its cabal2nix.14:45:58
@manuelbaerenz:matrix.orgManuel BärenzYeah, the fixpoint might not be tight14:46:19
@maralorn:maralorn.demaralornYep14:47:43
@maralorn:maralorn.demaralornIt uses pkgs.cabal2nix-unwrapped14:47:55
@manuelbaerenz:matrix.orgManuel BärenzI tried to replace callCabal2nix with a completely vanilla one, no change14:48:00
@maralorn:maralorn.demaralornOr is that haskellPackages.cabal2nix-unwrapped?14:48:26
@manuelbaerenz:matrix.orgManuel Bärenz Maybe it's my shellFor...? But for that I need the overridden package set 14:48:28
@maralorn:maralorn.demaralorn* ~~Or is that haskellPackages.cabal2nix-unwrapped?~~14:48:48
@maralorn:maralorn.demaralornAre you applying your haskellPackages override to a nixpkgs?14:49:12
@manuelbaerenz:matrix.orgManuel BärenzYes14:49:21
@maralorn:maralorn.demaralornWell then this makes sense.14:49:30
@maralorn:maralorn.demaralornpkgs.cabal2nix-unwrapped references pkgs.haskellPackages. So if you override pkgs.haskellPackages that will affect cabal2nix.14:50:03
@manuelbaerenz:matrix.orgManuel BärenzI tried not doing that, but then my package didn't appear at all in the package set14:50:06
@maralorn:maralorn.demaralornNot sure what you mean by that.14:50:28
@maralorn:maralorn.demaralorn sterni: Do you think it could be possible for us to handle bootpackages differently? i.e. could we maybe not compile most of the bootpackages in the ghc derivation or compile them but delete them from the ghc-pkg db and instead not null them in our configuration-*.nix files? 15:38:16
@maralorn:maralorn.demaralornOf course that won’t work for template-haskell, base, ghc-prim and a few more.15:40:28
@augyg:matrix.orglazyLambdaonly thing that came up there was from beam-core15:47:21
@augyg:matrix.orglazyLambdaI did do an override of beam-core in my projects default.nix but I was more so confused on why the module Rhyolite.Account had a beam type. 15:48:35
@augyg:matrix.orglazyLambdaWas able to resolve btw15:48:48
@alexfmpe:matrix.orgalexfmpeFWIW, I'm already using 9.6 and multi repl for dev with a package set directly from nixpkgs (not obelisk->reflex-platform->nixpkgs) instead of ob, and 8.10 only for prod builds15:51:25
@alexfmpe:matrix.orgalexfmpeMostly for the sake of a reliable recent HLS15:51:51
@alexfmpe:matrix.orgalexfmpeYou can also get older HLS (with a more brittle multi repl) with enough overrides https://discourse.haskell.org/t/recommended-way-of-using-hls-with-reflex-platform-obelisk/9933/615:54:46

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