* Move the composition of Haskell packages out of all-packages.nix

into haskell-packages.nix, which depends on an instance of GHC.
  This allows a consistent set of packages to be built with the same
  GHC.  For instance,

  $ nix-build -A haskellPackages_ghc683.xmonad

  builds xmonad and all its dependencies with GHC 6.8.3, while

  $ nix-build -A haskellPackages_ghc6102.xmonad

  does the same with GHC 6.10.2.  This is the same technique used with
  kernelPackages.  It also means that we don't need things like
  "cabal682" and "cabal683" anymore.

* The setup hook is now in a separate wrapper package so that we don't
  have to recompile all of GHC every time we want to make a small
  change.

* cinelerra: this package appears to have an accidental dependency on
  the "X11" Haskell package.

svn path=/nixpkgs/trunk/; revision=15125

pkgs/development/compilers/ghc/setup-hook.sh

@@ -4,7 +4,7 @@ ensureDir $ghc_support
 
 # Create isolated package config
 packages_db=$ghc_support/package.conf
-cp @out@/lib/ghc-*/package.conf $packages_db
+cp @ghc@/lib/ghc-*/package.conf $packages_db
 chmod +w $packages_db
 
 # Generate wrappers for GHC that use the isolated package config
@@ -13,7 +13,7 @@ makeWrapper() {
   wrapper="$ghc_support/$wrapperName"
   shift #the other arguments are passed to the source app
   echo '#!'"$SHELL" > "$wrapper"
-  echo "exec \"@out@/bin/$wrapperName\" $@" '"$@"' >> "$wrapper"
+  echo "exec \"@ghc@/bin/$wrapperName\" $@" '"$@"' >> "$wrapper"
   chmod +x "$wrapper"
 }
 

pkgs/development/compilers/ghc/wrapper.nix

@@ -0,0 +1,14 @@
+{stdenv, ghc}:
+
+stdenv.mkDerivation {
+  name = "${ghc.name}-wrapper";
+
+  propagatedBuildInputs = [ghc];
+
+  unpackPhase = "true";
+  installPhase = "true";
+  
+  setupHook = ./setup-hook.sh;
+
+  inherit ghc;
+}