ghcjs: properly wrap binaries in environment

This also:

 1  Builds Setup.hs with ghcjs, which (among other things) defines
    __GHCJS__ and ghcjs_HOST_OS during pre-processing.
 2  Fixes ghc-paths to point at ghcjs and use NIX_GHCJS_* env-vars.
 3  Boots ghcjs into $prefix/lib/$compiler.

1 files changed, 4 insertions, 0 deletions

diff --git a/pkgs/development/haskell-modules/configuration-ghcjs.nix b/pkgs/development/haskell-modules/configuration-ghcjs.nix
index e880f7e713e8..aef6e6c9190c 100644
--- a/pkgs/development/haskell-modules/configuration-ghcjs.nix
+++ b/pkgs/development/haskell-modules/configuration-ghcjs.nix
@@ -99,4 +99,8 @@ self: super: {
     buildDepends = [ self.base self.mtl self.text self.ghcjs-base ];
   });
 
+  ghc-paths = overrideCabal super.ghc-paths (drv: {
+    patches = [ ./ghc-paths-nix-ghcjs.patch ];
+  });
+
 }