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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/142 Servers

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21 Jul 2025
@maralorn:maralorn.demaralornMaybe the even appear somewhere in the build log, e.g. in the configureFlags, although I am not sure about that.10:03:23
@magic_rb:matrix.redalder.orgmagic_rbhm, i could swear it made a difference when i was developing this thing, idk why the performance difference vanished, now it doesnt really matter what flags i use10:03:47
@magic_rb:matrix.redalder.orgmagic_rbfun, my thesis is gonna be "well, these did something when i was writing this, now they seemingly dont anymore. IDFK why, future work"10:05:12
@maralorn:maralorn.demaralornDid you maybe apply expose-all-unfoldings to dependencies as well? That might make a difference.10:07:42
@magic_rb:matrix.redalder.orgmagic_rbnot that im aware of10:08:10
@magic_rb:matrix.redalder.orgmagic_rb
    ghc-options: -Wall -threaded -O2 -fllvm -Wno-unrecognised-pragmas -fspecialise-aggressively -fexpose-all-unfoldings

on my library and executables

10:08:23
@magic_rb:matrix.redalder.orgmagic_rb but not in cabal.project 10:08:29
@magic_rb:matrix.redalder.orgmagic_rband when i was profiling this back then, most of the slowness was in my code because of my custom monad transformer10:09:04
@magic_rb:matrix.redalder.orgmagic_rb im gonna remove the inline pragmas, those didnt seem to be enough last time i tried, which is why i enabled -fexpose-all-unfoldings 10:10:29
@magic_rb:matrix.redalder.orgmagic_rbbut ill try to removing them again and see if some difference shows up10:10:42
@magic_rb:matrix.redalder.orgmagic_rbokay, same result, im completely confused and have no clue what is going on10:19:40
@maralorn:maralorn.demaralornI mean, is it a different ghc version than when you added those flags?10:20:28

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