use a symlinked toolkit instead to make cmake working

flake.nix

@@ -35,6 +35,20 @@
         );
         pkgs = import nixpkgs { inherit system; };
         nativeBuildInputs = with pkgs; [ cmake ninja pkg-config ];
+        cudatoolkit_joined = with pkgs; symlinkJoin {
+          # HACK(Green-Sky): nix currently has issues with cmake findcudatoolkit
+          # see https://github.com/NixOS/nixpkgs/issues/224291
+          # copied from jaxlib
+          name = "${cudaPackages.cudatoolkit.name}-merged";
+          paths = [
+            cudaPackages.cudatoolkit.lib
+            cudaPackages.cudatoolkit.out
+          ] ++ lib.optionals (lib.versionOlder cudaPackages.cudatoolkit.version "11") [
+            # for some reason some of the required libs are in the targets/x86_64-linux
+            # directory; not sure why but this works around it
+            "${cudaPackages.cudatoolkit}/targets/${system}"
+          ];
+        };
         llama-python =
           pkgs.python3.withPackages (ps: with ps; [ numpy sentencepiece ]);
         postPatch = ''
@@ -71,31 +85,10 @@
         };
         packages.cuda = pkgs.stdenv.mkDerivation {
           inherit name src meta postPatch nativeBuildInputs postInstall;
-          buildInputs = with pkgs; buildInputs ++ [ cudaPackages.cudatoolkit ];
-
-          # HACK(Green-Sky): nix currently has issues with cmake findcudatoolkit, so we force gnu make
-          # see https://github.com/NixOS/nixpkgs/issues/224291
-          dontUseCmakeConfigure = true;
-          dontUseNinjaBuild = true;
-
-          buildFlags = [ "LLAMA_CUBLAS=1" ];
-          installPhase = ''
-            runHook preInstall
-
-            mkdir -p $out/bin
-
-            # TODO(Green-Sky): add install target to Makefile, or wait for cmake support
-            mv main $out/bin/
-            mv server $out/bin/
-            mv speculative $out/bin/
-            mv perplexity $out/bin/
-            mv embedding $out/bin/
-            mv quantize $out/bin/
-            mv llama-bench $out/bin/
-            mv train-text-from-scratch $out/bin/
-
-            runHook postInstall
-          '';
+          buildInputs = with pkgs; buildInputs ++ [ cudatoolkit_joined ];
+          cmakeFlags = cmakeFlags ++ [
+            "-DLLAMA_CUBLAS=ON"
+          ];
         };
         packages.rocm = pkgs.stdenv.mkDerivation {
           inherit name src meta postPatch nativeBuildInputs postInstall;