How do I overwrite ghc compiler version?

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1

Hi. I’ve been searching for this topic a lot and I’ve found some clues but I’m still not sure about how I would overwrite ghc compiler version with Nix. I want to build a project with ghc 8.10.1 but the default in right now is 8.8.3. I have a packages.nix file which I use to override haskell packages. So I’m assuming I would do it there

  let
    nixpkgs = import <nixpkgs> { inherit config; };
    config = {
      allowBroken = true;
      packageOverrides = pkgs:
        let
          hl = pkgs.haskell.lib;
          t = pkgs.lib.trivial;
          dontAndDisable = (t.flip t.pipe)
            [hl.dontCheck
             hl.dontCoverage
             hl.dontHaddock
            ];
        in rec {
          haskellPackages = pkgs.haskellPackages.override {
            overrides = self: super: {
            }
        }
2

I’m not really doing Haskell stuff, but won’t it be easier for you to just use haskell.packages.ghc8101 instead of messing with overriding the default ghc?

3 Likes
3

Probably is the way to go. I see now that I can do

nix-build -p haskell.compiler.ghc8101

for some reason I thought I would have to overwrite this option in the config files but passing this seems to do it.