use nixpkgs circt

flake.nix

@@ -4,15 +4,11 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/master";
     flake-utils.url = "github:numtide/flake-utils";
-    circtSrc = {
-      url = "git+https://github.com/llvm/circt?submodules=1&shallow=1";
-      flake = false;
-    };
   };
 
-  outputs = { self, nixpkgs, flake-utils, circtSrc }@inputs:
+  outputs = { self, nixpkgs, flake-utils }@inputs:
     let
-      overlay = import ./overlay.nix circtSrc ;
+      overlay = import ./overlay.nix;
     in
     flake-utils.lib.eachDefaultSystem
       (system:

overlay.nix

@@ -1,4 +1,4 @@
-circtSrc: final: prev:
+final: prev:
 {
   mill = (prev.mill.overrideAttrs (oldAttrs: rec {
     version = "0.11.5";
@@ -26,29 +26,14 @@ circtSrc: final: prev:
 
   espresso = final.callPackage ./nix/espresso.nix { };
   circt = prev.circt.overrideAttrs (old: rec {
-    version = circtSrc.shortRev;
-    cmakeFlags = [
-      "-DBUILD_SHARED_LIBS=ON"
-      "-DLLVM_ENABLE_BINDINGS=OFF"
-      "-DLLVM_ENABLE_OCAMLDOC=OFF"
-      "-DLLVM_BUILD_EXAMPLES=OFF"
-      "-DLLVM_OPTIMIZED_TABLEGEN=ON"
-      "-DLLVM_ENABLE_PROJECTS=mlir"
-      "-DLLVM_EXTERNAL_PROJECTS=circt"
-      "-DLLVM_EXTERNAL_CIRCT_SOURCE_DIR=.."
-      "-DCIRCT_LLHD_SIM_ENABLED=OFF"
-    ];
-    src = circtSrc;
-    preConfigure = ''
-      find ./test -name '*.mlir' -exec sed -i 's|/usr/bin/env|${final.coreutils}/bin/env|g' {} \;
-      substituteInPlace cmake/modules/GenVersionFile.cmake --replace "unknown git version" "git version ${version}"
-    '';
-    installPhase = ''
-      runHook preInstall
-      mkdir -p $out
-      CMAKE_INSTALL_PREFIX=$out cmake --build . --target install --config Release
-      runHook postInstall
-    '';
+    version = "nightly";
+    src = final.fetchFromGitHub {
+      owner = "llvm";
+      repo = "circt";
+      rev = "57372957e8365b34ca469299b8c864d830e836a1";
+      sha256 = "sha256-gExhWkhVhIpTKRCfF26pZnrcrf//ASQJDxEKbYc570s=";
+      fetchSubmodules = true;
+    };
   });
 
   llvm-lit = final.callPackage ./nix/llvm-lit.nix { };