GHCJS darwin fixes (#41120)

* GHCJS darwin fixes

* Fix ghcjs 80 and 710 packages

* Add socket-io to ghcjs 82 and 84 passthru

pkgs/development/compilers/ghcjs-ng/default.nix

···
 , xorg
 , gmp
 , pkgconfig
+, gcc
 , lib
+, nodePackages
 , ghcjsDepOverrides ? (_:_:{})
 }:
 
···
     inherit bootGhcjs;
     inherit (bootGhcjs) version;
     isGhcjs = true;
+
+    socket-io = nodePackages."socket.io";
 
     # Relics of the old GHCJS build system
     stage1Packages = [];
···
   libexec =
     if builtins.compareVersions bootGhcjs.version "8.3" <= 0
       then "${bootGhcjs}/bin"
-      else "${bootGhcjs}/libexec/${stdenv.system}-${passthru.bootPkgs.ghc.name}/${bootGhcjs.name}";
+      else "${bootGhcjs}/libexec/${builtins.replaceStrings ["darwin"] ["osx"] stdenv.system}-${passthru.bootPkgs.ghc.name}/${bootGhcjs.name}";
 
 in stdenv.mkDerivation {
     name = "ghcjs";
···
       xorg.lndir
       gmp
       pkgconfig
+    ] ++ lib.optionals stdenv.isDarwin [
+      gcc # https://github.com/ghcjs/ghcjs/issues/663
     ];
     phases = ["unpackPhase" "buildPhase"];
     buildPhase = ''

pkgs/top-level/haskell-packages.nix

···
     ghcjs = packages.ghcjs82;
     ghcjs710 = callPackage ../development/haskell-modules rec {
       buildHaskellPackages = ghc.bootPkgs;
-      ghc = bh.compiler.ghcjs;
+      ghc = bh.compiler.ghcjs710;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-7.10.x.nix { };
       packageSetConfig = callPackage ../development/haskell-modules/configuration-ghcjs.nix { };
     };
     ghcjs80 = callPackage ../development/haskell-modules rec {
       buildHaskellPackages = ghc.bootPkgs;
-      ghc = bh.compiler.ghcjsHEAD;
+      ghc = bh.compiler.ghcjs80;
       compilerConfig = callPackage ../development/haskell-modules/configuration-ghc-8.0.x.nix { };
       packageSetConfig = callPackage ../development/haskell-modules/configuration-ghcjs.nix { };
     };