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nsaritzky/haskell-nix-m1.md

Created April 6, 2022 15:51
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Haskell, Nix, and Apple Silicon
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haskell-nix-m1.md

GHC has spotty support for aarch64-darwin. Only certain newer versions have native support. As far as I can tell:

The fist two added support for an ARM LLVM backend. 9.2.1 has a native code generator that doesn't rely on LLVM and is apparentiy faster. But issues remain.

  • This bug in Nix distributions of GHC cause problems buiding certain packages, including Niv and Ormolu, the latter of which is a dependency of haskell-language-server. This has been fixed only for 8.10.7. HLS on other versions have failed to build on my machine at great length. Make sure you have the HLS cachix set up and beware cache misses.

I find that [this flake] works provided you set haskellPackages accordingly:

let hp = pkgs.haskell.packages.ghc8107;
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