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{ config, pkgs, lib, ... }:
let
cfg = config.boot.kernel.llvm;
in {
options = {
boot.kernel.llvm = {
enable = lib.mkEnableOption "building linux kernel with clang/LLVM" // {
default = true;
};
kernel = lib.mkPackageOption pkgs [ "linuxKernel" "kernels" "linux_default" ] {};
};
};
config = lib.mkIf cfg.enable {
boot.kernelPackages =
with pkgs; # Cut down on repeated `pkgs.` declarations
let
# Choose whichever LLVM version you please. `llvmPackages` is the
# default version, `llvmPackages_latest` is the latest (at the time of
# writing, LLVM 17.0.6 and 18.1.8 respectively).
llvm = llvmPackages_latest;
# Same deal as LLVM; choose whichever kernel version you like.
# `linux` is the latest LTS, `linux_latest` is the latest stable.
inherit (cfg) kernel;
in
# Generate kernel modules for our custom kernel.
linuxPackagesFor (
# Override our chosen kernel version with our custom settings.
(kernel.override {
# Set our chosen version of LLVM as our standard environment.
stdenv = overrideCC llvm.stdenv (
# Tell our C compiler (Clang) to use LLVM bintools--normally GNU
# binutils are used even with Clang as the compiler.
llvm.stdenv.cc.override {
bintools = llvm.bintools;
}
);
# Tell Linux that we're compiling with Clang and LLVM.
extraMakeFlags = [ "LLVM=1" ];
# If you'd like to edit your kernel configuration, use
# `structuredExtraConfig`. For example, some options available to us
# when compiling with Clang and linking with LLD:
structuredExtraConfig = {
# CFI_CLANG = lib.kernel.yes;
# LTO_CLANG_THIN = lib.kernel.yes;
};
}
).overrideAttrs
# Work around another NixOS specific issue where builds with WERROR=y
# are stopped by a benign error. See reference 1 below for details.
# Technically, this fix is only necessary with WERROR=y but the issue
# still causes a warning on builds where WERROR is unset.
{ env.NIX_CFLAGS_COMPILE = "-Wno-unused-command-line-argument"; }
);
};
}
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