nix-build: + xo-object + use clang 18 [WIP]

pkgs/xo-object.nix

@@ -0,0 +1,49 @@
+{
+  # nixpkgs dependencies
+  lib, stdenv, cmake, catch2,
+
+  # xo dependencies
+#  xo-reflect,
+#  xo-webutil,
+  xo-callback,
+  xo-unit,
+  xo-refcnt,
+  xo-reflectutil,
+  xo-alloc,
+  xo-randomgen,
+  xo-cmake,
+#  xo-printjson,
+#  xo-ordinaltree,
+  xo-indentlog,
+  doCheck ? true,
+} :
+
+stdenv.mkDerivation (finalattrs:
+  {
+    name = "xo-object";
+
+    src = ../xo-object;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"]
+                 ++ lib.optionals doCheck ["-DENABLE_TESTING=1"];
+
+    inherit doCheck;
+
+    nativeBuildInputs = [
+      cmake catch2
+      xo-randomgen
+      xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-callback
+      xo-unit
+      xo-refcnt
+#      xo-reflect
+#      xo-webutil
+#      xo-printjson
+#      xo-ordinaltree
+      xo-alloc
+      xo-reflectutil
+      xo-indentlog
+    ];
+  })