[nix] add standalone LLVM build for buddy-mlir

Signed-off-by: Avimitin <[email protected]>

nix/pkgs/buddy-llvm.nix

@@ -0,0 +1,45 @@
+{ stdenv
+, cmake
+, ninja
+, python3
+, fetchFromGitHub
+}:
+
+let
+  pythonEnv = python3.withPackages (ps: [
+    ps.numpy
+    ps.pybind11
+    ps.pyyaml
+    ps.ml-dtypes
+  ]);
+in
+stdenv.mkDerivation rec {
+  name = "llvm-for-buddy-mlir";
+  version = "6c59f0e1b0fb56c909ad7c9aad4bde37dc006ae0";
+  src = fetchFromGitHub {
+    owner = "llvm";
+    repo = "llvm-project";
+    rev = version;
+    hash = "sha256-bMJJ2q1hSh7m0ewclHOmIe7lOHv110rz/P7D3pw8Uiw=";
+  };
+
+  requiredSystemFeatures = [ "big-parallel" ];
+
+  propagatedBuildInputs = [
+    pythonEnv
+  ];
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+  ];
+
+  cmakeDir = "../llvm";
+  cmakeFlags = [
+    "-DLLVM_ENABLE_PROJECTS=mlir"
+    "-DLLVM_TARGETS_TO_BUILD=host;RISCV"
+    "-DLLVM_ENABLE_ASSERTIONS=ON"
+    "-DCMAKE_BUILD_TYPE=RELEASE"
+    "-DMLIR_ENABLE_BINDINGS_PYTHON=ON"
+  ];
+}