util: nix support (dirty fix not eliminated)

build.sc

@@ -298,7 +298,7 @@ object cases extends Module {
       PathRef(T.ctx.dest / "linker.ld")
     }
     def compile: T[PathRef] = T {
-      os.proc(Seq("clang", "-o", name() + ".elf" ,"--target=riscv32", "-march=rv32gcv", s"-L${musl.compile().path}/lib", s"-L${compilerrt.compile().path}/lib/riscv32", "-mno-relax", s"-T${linkScript().path}") ++ allSourceFiles().map(_.path.toString)).call(T.ctx.dest)
+      os.proc(Seq("/nix/store/jfliw7lqqfchrmnb21xi5d5pmxk1lvyg-clang-14.0.6/bin/clang", "-o", name() + ".elf" ,"--target=riscv32", "-march=rv32gcv", s"-L${musl.compile().path}/lib", s"-L${compilerrt.compile().path}/lib/riscv32", "-mno-relax", s"-T${linkScript().path}") ++ allSourceFiles().map(_.path.toString)).call(T.ctx.dest)
       os.proc(Seq("llvm-objcopy", "-O", "binary", "--only-section=.text", name() + ".elf", name())).call(T.ctx.dest)
       PathRef(T.ctx.dest / name())
     }

shell.nix

@@ -0,0 +1,65 @@
+{ pkgs ? import <nixpkgs> {}}:
+
+let
+  myLLVM = pkgs.llvmPackages_14;
+  espresso = pkgs.stdenv.mkDerivation rec {
+    pname = "espresso";
+    version = "2.4";
+    nativeBuildInputs = [ pkgs.cmake ];
+    src = pkgs.fetchFromGitHub {
+      owner = "chipsalliance";
+      repo = "espresso";
+      rev = "v${version}";
+      sha256 = "sha256-z5By57VbmIt4sgRgvECnLbZklnDDWUA6fyvWVyXUzsI=";
+    };
+  };
+  circt = pkgs.stdenv.mkDerivation rec {
+    pname = "circt";
+    version = "r4396.ce85204ca";
+    nativeBuildInputs = with pkgs; [ cmake ninja python3 git ];
+    src = pkgs.fetchFromGitHub {
+      owner = "llvm";
+      repo = "circt";
+      rev = "da364ea448b70aaa710f9e17063ed745db23b463";
+      sha256 = "sha256-oS+wh/hJeJcXj5RoxsUOOX8wMsxgMAMdQtPpyENO0JM=";
+      fetchSubmodules = true;
+    };
+    cmakeFlags = [
+      "-S/build/source/llvm/llvm"
+      "-DLLVM_ENABLE_PROJECTS=mlir"
+      "-DBUILD_SHARED_LIBS=OFF"
+      "-DLLVM_STATIC_LINK_CXX_STDLIB=ON"
+      "-DLLVM_ENABLE_ASSERTIONS=ON"
+      "-DLLVM_BUILD_EXAMPLES=OFF"
+      "-DLLVM_ENABLE_BINDINGS=OFF"
+      "-DLLVM_ENABLE_OCAMLDOC=OFF"
+      "-DLLVM_OPTIMIZED_TABLEGEN=ON"
+      "-DLLVM_EXTERNAL_PROJECTS=circt"
+      "-DLLVM_EXTERNAL_CIRCT_SOURCE_DIR=/build/source"
+      "-DLLVM_BUILD_TOOLS=ON"
+    ];
+    installPhase = ''
+      mkdir -p $out/bin
+      mv bin/firtool $out/bin/firtool
+    '';
+  };
+
+in pkgs.mkShellNoCC {
+    name = "vector";
+    buildInputs = with pkgs; [
+      myLLVM.clang
+      myLLVM.llvm
+      myLLVM.bintools
+
+      jdk mill python3
+      parallel protobuf ninja verilator antlr4 numactl dtc glibc_multi cmake
+      espresso
+      circt
+
+      git cacert # make cmake fetchContent happy
+      fmt glog
+    ];
+    shellHook = ''
+      export NIX_CC=" "
+    '';  # due to some cmake bug
+  }