1 files changed, 41 insertions, 0 deletions
diff --git a/pkgs/development/tools/haskell/hadrian/default.nix b/pkgs/development/tools/haskell/hadrian/default.nix
new file mode 100644
index 0000000000000..de10210ecd3e4
--- /dev/null
+++ b/pkgs/development/tools/haskell/hadrian/default.nix
@@ -0,0 +1,41 @@
+{ # GHC source tree to build hadrian from
+  ghcSrc ? null, ghcVersion ? null
+, mkDerivation, base, bytestring, Cabal, containers, directory
+, extra, filepath, lib, mtl, parsec, shake, text, transformers
+, unordered-containers
+, userSettings ? null
+, writeText
+}:
+
+if ghcSrc == null || ghcVersion == null
+then throw "hadrian: need to specify ghcSrc and ghcVersion arguments manually"
+else
+
+mkDerivation {
+  pname = "hadrian";
+  version = ghcVersion;
+  src = ghcSrc;
+  postUnpack = ''
+    sourceRoot="$sourceRoot/hadrian"
+  '';
+  # Overwrite UserSettings.hs with a provided custom one
+  postPatch = lib.optionalString (userSettings != null) ''
+    install -m644 "${writeText "UserSettings.hs" userSettings}" src/UserSettings.hs
+  '';
+  configureFlags = [
+    # avoid QuickCheck dep which needs shared libs / TH
+    "-f-selftest"
+    # Building hadrian with -O1 takes quite some time with little benefit.
+    # Additionally we need to recompile it on every change of UserSettings.hs.
+    # See https://gitlab.haskell.org/ghc/ghc/-/merge_requests/1190
+    "-O0"
+  ];
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    base bytestring Cabal containers directory extra filepath mtl
+    parsec shake text transformers unordered-containers
+  ];
+  description = "GHC build system";
+  license = lib.licenses.bsd3;
+}