Nix cleanups

flake.nix

@@ -86,9 +86,5 @@
       formatter = pkgs.alejandra;
     });
   in
-    # Recursive-merge attrsets to compose the final flake outputs attrset.
-    builtins.foldl' nixpkgs.lib.attrsets.recursiveUpdate {} [
-      no_system_outputs
-      all_system_outputs
-    ];
+    no_system_outputs // all_system_outputs;
 }

pkgs/default.nix

@@ -5,8 +5,7 @@
   pkgs,
   inputs,
   ...
-}:
-rec {
+}: rec {
   ncurses5-fhs = pkgs.callPackage ./ncurses5-fhs.nix {};
   fpga-udev-rules = pkgs.callPackage ./fpga-udev-rules {};
 
@@ -30,8 +29,6 @@ rec {
   veridian = pkgs.callPackage ./veridian/default.nix {inherit sv-lang_6;};
 
   riscv64-gcc = pkgs.pkgsCross.riscv64.buildPackages.gcc;
-}
-// pkgs.lib.optionalAttrs (pkgs.system == "x86_64-linux") {
   lowrisc-toolchain-gcc-rv32imcb = pkgs.callPackage ./lowrisc-toolchain-gcc-rv32imcb.nix {};
   lowrisc-toolchain-gcc-rv64imac = pkgs.callPackage ./lowrisc-toolchain-gcc-rv64imac.nix {};
 }

pkgs/lowrisc-toolchain-gcc-rv32imcb.nix

@@ -31,4 +31,8 @@ stdenv.mkDerivation rec {
       patchelf --set-rpath ${lib.makeLibraryPath ["$out" stdenv.cc.cc ncurses5]} "$f" || true
     done
   '';
+
+  meta = {
+    platforms = ["x86_64-linux"];
+  };
 }

pkgs/lowrisc-toolchain-gcc-rv64imac.nix

@@ -31,4 +31,8 @@ stdenv.mkDerivation rec {
       patchelf --set-rpath ${lib.makeLibraryPath ["$out" stdenv.cc.cc ncurses5]} "$f" || true
     done
   '';
+
+  meta = {
+    platforms = ["x86_64-linux"];
+  };
 }

pkgs/sv-lang.nix

@@ -73,6 +73,7 @@ in
       license = licenses.mit;
       maintainers = with maintainers; [sharzy];
       mainProgram = "slang";
+      broken = stdenv.system == "x86_64-darwin";
       platforms = platforms.all;
     };
   }