flake.nix

{
  description = "Dev shell for kiou (single-broker Kafka io_uring project)";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          inherit system;
        };
        lib = pkgs.lib;
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            clang-tools
            clang
            gcc
            cmake
            gnumake
            meson
            ninja
            pkg-config
            liburing
          ];

          CPATH = lib.makeSearchPath "include" [
            pkgs.glibc.dev
            pkgs.gcc
            pkgs.liburing.dev
          ];

          # Keep runtime libs focused on toolchain/libs and avoid glibc injection;
          # injecting glibc here can break clangd with symbol lookup errors.
          LD_LIBRARY_PATH = lib.makeLibraryPath [
            pkgs.gcc.cc.lib
            pkgs.liburing
          ];

          shellHook = ''
            export CC=${pkgs.gcc}/bin/gcc
            export CXX=${pkgs.gcc}/bin/g++

            # Use stable gcc/clang wrappers from Nix/System for system include probing.
            export KIOU_CLANGD_QUERY_DRIVER="/run/current-system/sw/bin/g++,/run/current-system/sw/bin/gcc,/nix/store/*/bin/g++,/nix/store/*/bin/gcc,/nix/store/*/bin/clang++,/nix/store/*/bin/clang"

            echo "kiou C/C++ dev shell ready."
            echo "CC=$CC"
            echo "CXX=$CXX"
            echo "clangd query-driver=$KIOU_CLANGD_QUERY_DRIVER"
            echo "Tip: meson setup --wipe build && ln -sf build/compile_commands.json compile_commands.json"
          '';
        };
      });
}