treewide: replace uses of ghc.name to find packages' datadir

nixos/modules/services/misc/gitit.nix

@@ -10,7 +10,7 @@ let
 
   toYesNo = b: if b then "yes" else "no";
 
-  gititShared = with cfg.haskellPackages; gitit + "/share/" + pkgs.stdenv.hostPlatform.system + "-" + ghc.name + "/" + gitit.pname + "-" + gitit.version;
+  gititShared = with cfg.haskellPackages; gitit + "/share/" + ghc.targetPrefix + ghc.haskellCompilerName + "/" + gitit.pname + "-" + gitit.version;
 
   gititWithPkgs = hsPkgs: extras: hsPkgs.ghcWithPackages (self: with self; [ gitit ] ++ (extras self));
 

pkgs/development/haskell-modules/configuration-common.nix

@@ -613,7 +613,7 @@ self: super: {
     doCheck = false;            # https://github.com/kazu-yamamoto/ghc-mod/issues/335
     executableToolDepends = drv.executableToolDepends or [] ++ [pkgs.buildPackages.emacs];
     postInstall = ''
-      local lispdir=( "$data/share/${self.ghc.name}/*/${drv.pname}-${drv.version}/elisp" )
+      local lispdir=( "$data/share/${self.ghc.targetPrefix}${self.ghc.haskellCompilerName}/*/${drv.pname}-${drv.version}/elisp" )
       make -C $lispdir
       mkdir -p $data/share/emacs/site-lisp
       ln -s "$lispdir/"*.el{,c} $data/share/emacs/site-lisp/
@@ -648,7 +648,7 @@ self: super: {
     # cannot easily byte-compile these files, unfortunately, because they
     # depend on a new version of haskell-mode that we don't have yet.
     postInstall = ''
-      local lispdir=( "$data/share/${self.ghc.name}/"*"/${drv.pname}-"*"/elisp" )
+      local lispdir=( "$data/share/${self.ghc.targetPrefix}${self.ghc.haskellCompilerName}/"*"/${drv.pname}-"*"/elisp" )
       mkdir -p $data/share/emacs
       ln -s $lispdir $data/share/emacs/site-lisp
     '';
@@ -659,7 +659,7 @@ self: super: {
     # We cannot easily byte-compile these files, unfortunately, because they
     # depend on a new version of haskell-mode that we don't have yet.
     postInstall = ''
-      local lispdir=( "$data/share/${self.ghc.name}/"*"/${drv.pname}-"*"/elisp" )
+      local lispdir=( "$data/share/${self.ghc.targetPrefix}${self.ghc.haskellCompilerName}/"*"/${drv.pname}-"*"/elisp" )
       mkdir -p $data/share/emacs
       ln -s $lispdir $data/share/emacs/site-lisp
     '';