Source dist logic

compiler/ghc/source-dist.nix

@@ -0,0 +1,40 @@
+{ src, stdenv, pkgs, version, ghc, alex, happy, hscolour }:
+stdenv.mkDerivation {
+
+    inherit version;
+
+    name = "ghc-source-dist";
+
+    buildInputs = [ ghc alex happy hscolour ] ++ (with pkgs; [ automake bash git cacert python3 autoconf xorg.lndir ]);
+
+    inherit src;
+
+    phases = [ "unpackPhase" "buildPhase" "installPhase" ];
+
+    buildPhase = ''
+    # Happy and Alex are confused about their data dirs. See
+    # https://github.com/haskell/cabal/issues/5862 for details.
+    #
+    # This is fixed in more recent builds.  We can't rely on
+    # custom built tools as computing the source-dist is pretty
+    # much in the bootstrap lane.
+
+    export alex_datadir=$(find ${alex}/share -name "alex-*" -type d -and -not -path "*doc*")
+    export happy_datadir=$(find ${happy}/share -name "happy-*" -type d -and -not -path "*doc*")
+
+    # We need to --skip-url-rewrites, ghc is a bit too strict here.
+    python3 ./boot --skip-url-rewrites
+     # let's not flood the screen with garbage.
+    ./configure --silent
+
+    # this folder ends up being needed for the windows dists; just mock it.
+    mkdir ghc-tarballs
+    make sdist --silent
+    '';
+
+    installPhase = ''
+    mkdir -p $out
+    install -Dm644 sdistprep/ghc-$(cat VERSION)-src.tar.xz       $out/src.tar.xz
+    install -Dm644 sdistprep/ghc-$(cat VERSION)-testsuite.tar.xz $out/testsuite.tar.xz
+    '';
+}