Use makeConfigFiles

Author: hamishmack

builder/setup-builder.nix

@@ -5,80 +5,22 @@
 let
   fullName = "${name}-setup";
 
-  flagsAndConfig = field: xs: lib.optionalString (xs != []) ''
-    echo ${lib.concatStringsSep " " (map (x: "--${field}=${x}") xs)} >> $out/configure-flags
-    echo "${field}: ${lib.concatStringsSep " " xs}" >> $out/cabal.config
-  '';
-
-  flatDepends =
-    let
-      makePairs = map (p: rec { key="${val}"; val=(p.components.library or p); });
-      closure = builtins.genericClosure {
-        startSet = makePairs setup-depends;
-        operator = {val,...}: makePairs val.config.depends;
-      };
-    in map ({val,...}: val) closure;
-
   includeGhcPackage = lib.any (p: p.identifier.name == "ghc") setup-depends;
 
-  configFiles = runCommand "${fullName}-config" { nativeBuildInputs = [ghc]; } (''
-    mkdir -p $out
-
-    # Calls ghc-pkg for the target platform
-    target-pkg() {
-      ${ghc.targetPrefix}ghc-pkg "$@"
-    }
-
-    target-pkg init $out/package.conf.d
-
-    # Copy over the nonReinstallablePkgs from the global package db.
-    # Note: we need to use --global-package-db with ghc-pkg to prevent it
-    #       from looking into the implicit global package db when registering the package.
-    ${lib.concatMapStringsSep "\n" (p: ''
-      target-pkg describe ${p} | target-pkg --force --global-package-db $out/package.conf.d register - || true
-    '') nonReinstallablePkgs}
-
-    ${lib.concatMapStringsSep "\n" (p: ''
-      target-pkg --package-db ${p}/package.conf.d dump | target-pkg --force --package-db $out/package.conf.d register -
-    '') flatDepends}
-
-    # Note: we pass `clear` first to ensure that we never consult the implicit global package db.
-    ${flagsAndConfig "package-db" ["clear" "$out/package.conf.d"]}
-
-    echo ${lib.concatStringsSep " " (lib.mapAttrsToList (fname: val: "--flags=${lib.optionalString (!val) "-" + fname}") flags)} >> $out/configure-flags
-
-  ''
-  # This code originates in the `generic-builder.nix` from nixpkgs.  However GHC has been fixed
-  # to drop unused libraries referneced from libraries; and this patch is usually included in the
-  # nixpkgs's GHC builds.  This doesn't sadly make this stupid hack unnecessary.  It resurfes in
-  # the form of Cabal trying to be smart. Cabal when linking a library figures out that you likely
-  # need those `rpath` entries, and passes `-optl-Wl,-rpath,...` for each dynamic library path to
-  # GHC, thus subverting the linker and forcing it to insert all those RPATHs weather or not they
-  # are needed.  We therfore reuse the linker hack here to move all al dynamic lirbaries into a
-  # common folder (as links) and thus prevent Cabal from going nuts.
-  #
-  # TODO: Fix Cabal.
-  # TODO: this is only needed if we do dynamic libraries.
-  + lib.optionalString stdenv.isDarwin ''
-    # Work around a limit in the macOS Sierra linker on the number of paths
-    # referenced by any one dynamic library:
-    #
-    # Create a local directory with symlinks of the *.dylib (macOS shared
-    # libraries) from all the dependencies.
-    local dynamicLinksDir="$out/lib/links"
-    mkdir -p $dynamicLinksDir
-    for d in $(grep dynamic-library-dirs "$out/package.conf.d/"*|awk '{print $2}'|sort -u); do
-      ln -s "$d/"*.dylib $dynamicLinksDir
-    done
-    # Edit the local package DB to reference the links directory.
-    for f in "$out/package.conf.d/"*.conf; do
-      sed -i "s,dynamic-library-dirs: .*,dynamic-library-dirs: $dynamicLinksDir," $f
-    done
-  '' + ''
-    target-pkg --package-db $out/package.conf.d recache
-  '' + ''
-    target-pkg --package-db $out/package.conf.d check
-  '');
+  makeConfigFiles = haskellLib.weakCallPackage buildPackages ./make-config-files.nix {
+    inherit ghc haskellLib nonReinstallablePkgs;
+  };
+
+  configFiles = makeConfigFiles {
+    inherit (package) identifier;
+    inherit fullName flags;
+    component = {
+      depends = setup-depends;
+      libs = [];
+      frameworks = [];
+      doExactConfig = false;
+    };
+  }; 
 
 in stdenv.lib.fix (drv: