nix build: + xo-expression2

pkgs/xo-expression2.nix

@@ -0,0 +1,45 @@
+{
+  # nixpkgs dependencies
+  lib, stdenv, cmake, catch2,
+
+  # xo dependencies
+  xo-gc,
+  xo-type,
+  xo-reflect,
+  xo-procedure2,
+  xo-printable2,
+  xo-flatstring,
+  xo-subsys,
+  xo-indentlog,
+  xo-cmake,
+
+  # config arguments
+  doCheck ? true
+} :
+
+stdenv.mmkDerivation (finalattrs :
+  {
+    name = "xo-expression2";
+
+    src = ../xo-expression2;
+
+    cmakeFlags = ["-DCMAKE_MODULE_PATH=${xo-cmake}/share/cmake"]
+                  ++ lib.optionals doCheck ["-DENABLE_TESTING=1"];
+
+    inherit doCheck;
+
+    nativeBuildInputs = [
+      cmake catch2
+      xo-cmake
+    ];
+    propagatedBuildInputs = [
+      xo-gc
+      xo-type
+      xo-reflect
+      xo-procedure2
+      xo-printable2
+      xo-flatstring
+      xo-subsys
+      xo-indentlog
+    ];
+  })