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trim ghcXX-minimal-ghc closure: build happy/alex with the shell's GHC (−2.12 GB) #249

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trim ghcXX-minimal-ghc closure: build happy/alex with the shell's GHC (−2.12 GB) #249

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19 changes: 18 additions & 1 deletion dynamic.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -135,7 +135,24 @@ pkgs.mkShell {
)
++ attrValues haskell-tools
++ optionals withGHCTooling (
with pkgs; [ python3 automake autoconf alex happy git libffi.dev ]
# `pkgs.alex` and `pkgs.happy` from nixpkgs are built with a different
# GHC than the shell's `compiler` (currently ghc-9.10.3 in nixpkgs
# haskellPackages), and their library outputs anchor that foreign GHC
# in the closure (~2.15 GB on Darwin). Use haskell.nix's `tool` builder
# — same pattern as cross-js.nix and cross-windows.nix — to build them
# with the shell's `compiler-nix-name`, so library outputs reference
# the GHC that's already in the closure rather than dragging in a
# second one. `gitMinimal` swaps out heavyweight git (saves ~150 MB
# of perl-modules + git-doc that aren't used inside the shell).
with pkgs; [
python3
automake
autoconf
(tool "alex")
(tool "happy")
gitMinimal
libffi.dev
]
)
;

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7 changes: 5 additions & 2 deletions tool-map.nix
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Expand Up @@ -43,8 +43,11 @@ compiler-nix-name: tool: {
cabalProject = __readFile (src + "/cabal.project");
configureArgs = "--disable-benchmarks --disable-tests";
};
happy = { version = "1.20.1.1"; inherit cabalProjectLocal; };
alex = { version = "3.2.7.3"; inherit cabalProjectLocal; };
# happy/alex don't need head.hackage (they're standard mainline packages and
# build cleanly from regular hackage). Dropping `inherit cabalProjectLocal`
# also avoids depending on the head.hackage SHA pin going stale.
happy = { version = "2.1.7"; };
alex = { version = "3.5.4.0"; };
cabal = rec {
src = self.inputs.cabal;
# We use the cabal.boostrap.project file, as we don't
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