Add release file for hydra

default.nix

@@ -1,5 +1,34 @@
-{ pkgs ? import <nixpkgs> {} }: let
-  overlay = import ./overlay.nix;
+{
+  compiler ? "ghc863"
+, nixpkgs-rev ? "120eab94e0981758a1c928ff81229cd802053158"
+, nixpkgs-sha256 ? "0qk6k8gxx5xlkyg05dljywj5wx5fvrc3dzp4v2h6ab83b7zwg813"
+
+, pkgs ? import (builtins.fetchTarball {
+    url = "https://github.com/NixOS/nixpkgs/archive/${nixpkgs-rev}.tar.gz";
+    sha256 = nixpkgs-sha256;
+  }) {
+    config.allowUnfree = true;
+    config.allowBroken = false;
+  }
+
+, doStrict  ? false
+, doTracing ? false
+
+}:
+
+let
+
+  overlay = self: super: builtins.mapAttrs (k: v: (
+
+    pkgs.haskell.lib.overrideCabal v (drv: {
+
+                   configureFlags =
+                        pkgs.stdenv.lib.optional doTracing "--flags=tracing"
+                     ++ pkgs.stdenv.lib.optional doStrict  "--ghc-options=-Werror";
+      })
+
+    )) (import ./overlay.nix self super);
+
   overrideHaskellPackages = orig: {
     buildHaskellPackages =
       orig.buildHaskellPackages.override overrideHaskellPackages;
@@ -7,10 +36,9 @@
       then pkgs.lib.composeExtensions orig.overrides overlay
       else overlay;
   };
+  
 in {
   haskellPackages =
-    pkgs.haskellPackages.override overrideHaskellPackages;
-  haskell844Packages =
-    pkgs.haskell.packages.ghc844.override overrideHaskellPackages;
+    pkgs.haskell.packages.${compiler}.override overrideHaskellPackages;
   inherit pkgs;
 }

release.nix

@@ -0,0 +1,23 @@
+{}:
+let matrix = [
+      { compiler = "ghc863"; doStrict = false; doTracing = false; }
+      { compiler = "ghc863"; doStrict = false; doTracing = true;  }
+
+      { compiler = "ghc844"; doStrict = false; doTracing = false; }
+      { compiler = "ghc844"; doStrict = false; doTracing = true;  }
+
+      # Broken
+      # { compiler = "ghc802"; doStrict = false; doTracing = false; }
+      # { compiler = "ghc802"; doStrict = false; doTracing = true;  }
+
+      # Deprecated
+      # { compiler = "ghc822"; doStrict = true;  doTracing = false; }
+      # { compiler = "ghc822"; doStrict = true;  doTracing = true;  }
+
+      # Broken
+      # { compiler = "ghcjs";  doStrict = false; doTracing = false; }
+    ];
+    boolToString = x: if x then "true" else "false";
+    nameForConfig = {compiler, doStrict, doTracing}: builtins.concatStringsSep "-"
+      [ compiler (boolToString doStrict) (boolToString doTracing) ];
+in builtins.listToAttrs (map (args: { name = nameForConfig args; value = import ./. args; }) matrix)