flake: add nix flake for building remill

Add a Nix flake that builds remill and its XED dependency
using LLVM 17, with patched Ghidra sources for Sleigh.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -105,3 +105,6 @@ VERSION
 
 # Doxygen generated documentation
 docs/doxygen/
+
+# Nix
+result

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1767313136,
+        "narHash": "sha256-16KkgfdYqjaeRGBaYsNrhPRRENs0qzkQVUooNHtoy2w=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ac62194c3917d5f474c1a844b6fd6da2db95077d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,125 @@
+{
+  description = "Remill - Static binary translator that lifts machine code to LLVM bitcode";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+
+  outputs = { self, nixpkgs }:
+    let
+      forSystems = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+    in
+    {
+      packages = forSystems (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          llvmPkgs = pkgs.llvmPackages_17;
+
+          xed = llvmPkgs.stdenv.mkDerivation {
+            pname = "xed";
+            version = "2025.06.08";
+
+            src = pkgs.fetchFromGitHub {
+              owner = "intelxed";
+              repo = "xed";
+              rev = "v2025.06.08";
+              hash = "sha256-FXVWCq7ykuSsVx8iB7WkFD7DDq6o/4bgsS0YJQWE+XM=";
+            };
+
+            mbuild = pkgs.fetchFromGitHub {
+              owner = "intelxed";
+              repo = "mbuild";
+              rev = "v2024.11.04";
+              hash = "sha256-iQVykBG3tEPxI1HmqBkvO1q+K8vi64qBfVC63/rcTOk=";
+            };
+
+            nativeBuildInputs = [ pkgs.python3 ];
+
+            dontConfigure = true;
+
+            postUnpack = "cp -r $mbuild mbuild";
+
+            buildPhase = ''
+              runHook preBuild
+              patchShebangs .
+              python3 mfile.py install \
+                --install-dir=$out \
+                --cc=$CC --cxx=$CXX \
+                --ar=$AR \
+                --compiler=clang \
+                --static \
+                --extra-ccflags=-fPIC \
+                --extra-cxxflags=-fPIC
+              runHook postBuild
+            '';
+
+            installPhase = ''
+              runHook preInstall
+              mkdir -p $out/lib/cmake/XED
+              cp ${./dependencies/XEDConfig.cmake.in} $out/lib/cmake/XED/XEDConfig.cmake
+              runHook postInstall
+            '';
+          };
+
+          sleighSrc = pkgs.fetchFromGitHub {
+            owner = "lifting-bits";
+            repo = "sleigh";
+            rev = "7c6b742";
+            hash = "sha256-Di/maGPXHPSM/EUVTgNRsu7nJ0Of+tVRu+B4wr9OoBE=";
+          };
+
+          ghidraSource = pkgs.applyPatches {
+            src = pkgs.fetchFromGitHub {
+              owner = "NationalSecurityAgency";
+              repo = "ghidra";
+              rev = "80ccdadeba79cd42fb0b85796b55952e0f79f323";
+              hash = "sha256-7Iv1awZP5lU1LpGqC0nyiMxy0+3WOmM2NTdDYIzKmmk=";
+            };
+            patches =
+              let dir = ./patches/sleigh;
+              in map (f: dir + "/${f}")
+                (builtins.filter (f: nixpkgs.lib.hasSuffix ".patch" f)
+                  (builtins.sort builtins.lessThan
+                    (builtins.attrNames (builtins.readDir dir))));
+          };
+
+          remill = llvmPkgs.stdenv.mkDerivation {
+            pname = "remill";
+            version = "0-unstable-${self.shortRev or self.dirtyShortRev or "unknown"}";
+
+            src = self;
+
+            nativeBuildInputs = [
+              pkgs.cmake
+              pkgs.ninja
+              pkgs.git
+            ];
+
+            buildInputs = [
+              llvmPkgs.llvm.dev
+              llvmPkgs.llvm.lib
+              xed
+              pkgs.glog
+              pkgs.gflags
+              pkgs.gtest
+            ];
+
+            cmakeFlags = [
+              "-DFETCHCONTENT_SOURCE_DIR_SLEIGH=${sleighSrc}"
+              "-DFETCHCONTENT_SOURCE_DIR_GHIDRASOURCE=${ghidraSource}"
+              "-DFETCHCONTENT_FULLY_DISCONNECTED=ON"
+              "-DCLANG_PATH:FILEPATH=${pkgs.writeShellScript "bc-clang" ''
+                exec ${llvmPkgs.clang-unwrapped}/bin/clang++ \
+                  -resource-dir ${llvmPkgs.clang-unwrapped.lib}/lib/clang/17 \
+                  "$@"
+              ''}"
+              "-DREMILL_ENABLE_TESTING=OFF"
+              "-DGIT_FAIL_IF_NONZERO_EXIT=FALSE"
+            ];
+          };
+        in
+        {
+          default = remill;
+          inherit xed remill;
+        }
+      );
+    };
+}