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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.org148 Servers

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21 Jul 2025
@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
@magic_rb:matrix.redalder.orgmagic_rbi think i found it10:21:36
@magic_rb:matrix.redalder.orgmagic_rbthere was a problem between the keyboard and my chair10:21:50
@magic_rb:matrix.redalder.orgmagic_rbthe monkey forgot to use a variable he declared10:21:57
@alex:tunstall.xyzAlex
In reply to @magic_rb:matrix.redalder.org
im benchmarking a thing i wrote and im making a nix package out of a cabal file using cabal2nix, however if i change the source cabal file and remove -fllvm, -O2, or -fexpose-all-unfoldings the performance measurements dont seem to change even though im positive they should. Is nixpkgs overwriting my flags somehow?
If you're using a profiling build, beware of automatic cost centres (IIRC enabled by default in cabal).
10:37:54

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