Linux Kernel Development using NixOS

rjpc · March 21, 2024, 7:26pm

thefossguy · March 21, 2024, 11:53pm

Nice! I have something similar too. Instead of specifying dependencies, I just pull from the buildInputs of the linux_latest package, like so:

github.com

thefossguy/nix-kernel-dev/blob/b0f5dd26434f19d4beb1e5209ed40da1114bb654/flake.nix#L74


      
              CLEAN_BUILD = 0;
              INSTALL_ZE_KERNEL = 1;
            };
          in
          {
            devShells = forEachSupportedSystem ({ pkgs, commonInputs, llvmPkgs, llvmVersion, ... }: rec {
              default = withLLVM;
              #default = withGNU;
          
          
    withLLVM = (pkgs.mkShell.override { stdenv = llvmPkgs.stdenv; }) {
                inputsFrom = [ pkgs.linux_latest_with_llvm ];
                packages = commonInputs
                  # for some reason, `llvmPkgs.stdenv` does not have `lld` or actually `bintools`
                  ++ [ llvmPkgs.bintools ];
          
          
      # Disable '-fno-strict-overflow' compiler flag because it causes the build to fail with the following error:
                # clang-16: error: argument unused during compilation: '-fno-strict-overflow' [-Werror,-Wunused-command-line-argument]
                hardeningDisable = [ "strictoverflow" ];
          
          
      env = rec {
                  # just in case you want to disable building with the LLVM toolchain

That way, if any new build dependencies are added, I don’t need to worry about it.