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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.org145 Servers

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26 Dec 2025
@magthe:tchncs.deMagnusIt's just than when doing overrides it's really nice to specify the exact version. Especially when we've in the past have been using several different minor versions in different projects that all share a common overlay.16:20:38
@magthe:tchncs.deMagnus Very strange... I seem to have gotten a broken hash or something, because a 2nd nix flake update updated the hash again... and now 9.10.3 is there. I guess it was a blip. Very strange. 16:23:18
@magthe:tchncs.deMagnus * Very strange... I seem to have gotten a broken hash or something, because a 2nd nix flake update updated the hash again... and now 9.10.3 is there. I guess it was a blip. 🤷‍♂️ 16:24:42
@noiobeforebedtime:winesj.comJack​Hi everyone. Thanks for all the work you do. Is there a nice way to force GHC to use the llvm backend in a similar way to pkgs.pkgsLLVM? I've noticed that if you dig in in the repl at `nixpkgs#haskell.compliler.ghc914.llvmPackages' it has what looks like a set "-fllvm"-satisfying dependencies.19:12:09
@noiobeforebedtime:winesj.comJack​

In short, I'm trying to override and use "-fllvm" for all my dependencies but I can't find a better way than:

          monad-par.extraBuildFlags = ["--ghc-options=-fllvm"];
          monad-par.extraPkgconfigDepends = [
          pkgs.llvmPackages_20.clang
          pkgs.llvmPackages_20.libllvm
          ]
          ;

for all of them

19:13:35
20 May 2021
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