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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/146 Servers

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4 Aug 2025
@teoc:matrix.orgTeo (he/him)Are you able to reproduce this outside of nix? Might be good to open a GHC ticket if you can confirm it's a GHC issue15:31:08
@teoc:matrix.orgTeo (he/him)Oh you already said you couldn't reproduce it outside of nix builds15:34:38
@sternenseemann:systemli.orgsterni teo (they/he): I mean what you could put on your GHC review pile is my never reviewed MR :p https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13932 16:30:06
@teoc:matrix.orgTeo (he/him)Will do! Feel free to tag me in the future too. It's a real shame that that slipped through the cracks16:31:20
@teoc:matrix.orgTeo (he/him)I hadn't realized you were already trying to build a stage2 compiler for these configurations. I know that isn't supported in hadrian in general and that's being fixed in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/11444. But maybe it would be supported in this case and something is just going wrong with this flag. I'll look into it and see if there's an easy fix16:33:24
@sternenseemann:systemli.orgsterni I was convinced it worked, but when I checked the log I saw that only ghc the library is built in _build/stage1/compiler just before it finishes. Checking ghc --info revealed that it's indeed just Stage1 :( 16:48:18
@teoc:matrix.orgTeo (he/him)Ah annoying!16:56:45
@oak:universumi.fioak 🏳️‍🌈♥️Is it possible to ignore specific testcases when packaging a Haskell package, instead of disabling all the tests with dontCheck? With overrideCabal?19:03:10
@oak:universumi.fioak 🏳️‍🌈♥️Found a solution, modify testFlags through overrideCabal21:09:34
5 Aug 2025
@mrcjk:matrix.orgMarc Jakobi I think I've narrowed the high memory consumption down to the use of inline-python's marshalling functions (fromPy, ...).
Will investigate further...
06:59:22
@mrcjk:matrix.orgMarc JakobiIt's not inline-python either. But I can work around it by disabling library profiling, which probably explains why I wasn't able to reproduce it outside of nix.09:48:07
@fargate:pikaviestin.fiFargate joined the room.12:44:58

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