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Merged
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Jul 28, 2025
Merged

Pin Nix GHC minor version #2984

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -116,7 +116,7 @@ Or [use Nix](https://nixos.org/nix/download.html) to get a shell with the `clash
nix develop .

# Start a dev shell with a specific GHC version
nix develop .#ghc961
nix develop .#ghc9101
```

You will need a modern version of nix with support for the new-style `nix`
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4 changes: 2 additions & 2 deletions flake.nix
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Expand Up @@ -36,12 +36,12 @@
# The versions of GHC that we want to be able to build / develop against
# within the nix environment. Since nix is lazy, only derivations for
# versions of GHC which are used are actually evaluated.
ghcVersions = [ "ghc96" "ghc98" "ghc910" ];
ghcVersions = [ "ghc964" "ghc982" "ghc9101" ];

# We pick a single version of GHC to use by default within nix. This is
# probably cleaner than always having N copies of each package / app and
# being forced to refer to them by their GHC version.
defaultGhcVersion = "ghc910";
defaultGhcVersion = "ghc9101";

# Overlays are not per-system, so let's only compute them once.
# For each version of GHC we produce a `pkgs.clashPackages-ghcVER`, e.g.
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4 changes: 3 additions & 1 deletion nix/overlay.nix
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Expand Up @@ -15,7 +15,9 @@ compilerVersion:
final: prev:
let
# An overlay with the things we need to change for the specified GHC version.
ghcOverlay = import (./. + "/overlay-${compilerVersion}.nix") {
# The overlays are named without the GHC minor version, so we need to strip the last character from the version
strippedMinorVersion = builtins.substring 0 (builtins.stringLength compilerVersion - 1) compilerVersion;
ghcOverlay = import (./. + "/overlay-${strippedMinorVersion}.nix") {
pkgs = prev;
};

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