tests.haskell.incremental: init

1 files changed, 35 insertions, 0 deletions

diff --git a/pkgs/test/haskell/incremental/default.nix b/pkgs/test/haskell/incremental/default.nix
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index 0000000000000..b94a85277db3f
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+++ b/pkgs/test/haskell/incremental/default.nix
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+# Demonstration of incremental builds for Haskell. Useful for speeding up CI.
+#
+# See: https://www.haskellforall.com/2022/12/nixpkgs-support-for-incremental-haskell.html
+# See: https://felixspringer.xyz/homepage/blog/incrementalHaskellBuildsWithNix
+
+{ haskell, lib }:
+
+let
+  inherit (haskell.lib.compose) overrideCabal;
+
+  # Incremental builds work with GHC >=9.4.
+  turtle = haskell.packages.ghc944.turtle;
+
+  # This will do a full build of `turtle`, while writing the intermediate build products
+  # (compiled modules, etc.) to the `intermediates` output.
+  turtle-full-build-with-incremental-output = overrideCabal (drv: {
+    doInstallIntermediates = true;
+    enableSeparateIntermediatesOutput = true;
+  }) turtle;
+
+  # This will do an incremental build of `turtle` by copying the previously
+  # compiled modules and intermediate build products into the source tree
+  # before running the build.
+  #
+  # GHC will then naturally pick up and reuse these products, making this build
+  # complete much more quickly than the previous one.
+  turtle-incremental-build = overrideCabal (drv: {
+    previousIntermediates = turtle-full-build-with-incremental-output.intermediates;
+  }) turtle;
+in
+  turtle-incremental-build.overrideAttrs (old: {
+    meta = {
+      maintainers = lib.teams.mercury.members;
+    };
+  })