Remove ghcjs builder. Update README

Author: pranaysashank

README.md

@@ -3,8 +3,15 @@
 This is a fork that builds only Cabal projects, uses ghc from upstream
 nixpkgs, and doesn't support cross platform builds / ghcjs builds. It
 was forked after we had to build every ghc from 8.10.7 to 9.8.2 one
-too many times. This fork also contains a fix that properly respects
-index-state in presence of revisions
+too many times. This fork also contains a bug fix that properly
+respects index-state in presence of revisions.
+
+There is a bug that is carried on from haskell.nix repo, where pinning
+a different version of a ghc core library will silently fail i.e. the
+plan succeeds but it'll always use the library shipped with the ghc
+version which can be misleading.
+
+
 
 `haskell.nix` can automatically translate your Cabal or Stack project and
 its dependencies into Nix code.

builder/Setup.ghcjs.hs

@@ -31,7 +31,7 @@ let
 
   cabalFile = if package-description-override == null || bundledSrc != null then null else package-description-override;
 
-  defaultSetupSrc = if stdenv.hostPlatform.isGhcjs then ./Setup.ghcjs.hs else ./Setup.hs;
+  defaultSetupSrc = if stdenv.hostPlatform.isGhcjs then abort "No implementation for ghcjs" else ./Setup.hs;
 
   setup = if package.buildType == "Simple"
     then

builder/hspkg-builder.nix

@@ -13,7 +13,7 @@ let
   haskellLib = final.haskell-nix.haskellLib;
   defaultSetupSrc =
     if final.stdenv.targetPlatform.isGhcjs
-      then ../builder/Setup.ghcjs.hs
+      then abort "No implementation for ghcjs"
       else ../builder/Setup.hs;
   addDefaultSetup = compiler-nix-name: ghc:
     let