create separate debug devshell

flake.nix

@@ -24,7 +24,7 @@
     devShells = forAllSystems (
       system: pkgs: let
         lib = pkgs.lib;
-      in {
+      in rec {
         default = pkgs.mkShell {
           packages = with pkgs; [
             gnumake
@@ -37,19 +37,9 @@
             bear # clang compile_commands.json
             valgrind # memory debugging+profiling
 
-            # .NET Compiler & Runtime
-            (with dotnetCorePackages;
-              combinePackages [
-                sdk_9_0
-                runtime_9_0
-              ])
-            # .NET Development Tooling
-            ilspycmd
-
             # Dear ImGui
             freetype.dev
             # SDL3+OpenGL3 backend (OPTIONAL)
-            # TODO: remove these and only install if necessary
             glfw3
             glm
             sdl3
@@ -66,7 +56,27 @@
 
           # so I can easily read the glibc header files
           GLIBC = "${pkgs.glibc.dev}/include";
+          # GLIBCXX = "${pkgs.glib.dev}/include";
         };
+
+        debug = default.override (prev: {
+          packages = with pkgs;
+            prev.packages
+            ++ [
+              # .NET Compiler & Runtime
+              (with dotnetCorePackages;
+                combinePackages [
+                  sdk_9_0
+                  runtime_9_0
+                ])
+              # .NET Development Tooling
+              ilspycmd
+
+              # Hammer
+              scons
+              pkg-config
+            ];
+        });
       }
     );
   };