117 lines
3.8 KiB
Nix
117 lines
3.8 KiB
Nix
{
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inputs = {
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# a better way of using the latest stable version of nixpkgs
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# without specifying specific release
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nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
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};
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outputs = { self, nixpkgs, ... }:
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let
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# helpers for producing system-specific outputs
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supportedSystems = [
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"aarch64-linux"
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"riscv64-linux"
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"x86_64-linux"
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];
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forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f rec {
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pkgs = import nixpkgs {
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inherit system;
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overlays = [
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(final: prev: {
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linux_latest_with_llvm = prev.linux_latest.override {
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stdenv = llvmPkgs.stdenv;
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};
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})
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];
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};
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llvmPkgs = pkgs.llvmPackages;
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# this gets the "major version" of LLVM, eg "16" or "17"
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llvmVersion = builtins.elemAt (builtins.splitVersion llvmPkgs.clang.version) 0;
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commonInputs = with pkgs; [
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# for a better kernel developer workflow
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b4
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dt-schema
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neovim
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yamllint
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# for "make menuconfig"
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pkg-config
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ncurses
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# testing the built kernel in a VM using QEMU
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debootstrap # fur creating ze rootfs
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gdb
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qemu_kvm
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# extra utilities _I_ find useful
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bat
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broot
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choose
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fd
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ripgrep
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# formatting this flake
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nixfmt
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];
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});
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globalBuildFlags = {
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# build related flags (for the script)
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CLEAN_BUILD = 0;
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INSTALL_ZE_KERNEL = 1;
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};
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in
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{
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devShells = forEachSupportedSystem ({ pkgs, commonInputs, llvmPkgs, llvmVersion, ... }: rec {
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default = withLLVM;
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#default = withGNU;
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withLLVM = (pkgs.mkShell.override { stdenv = llvmPkgs.stdenv; }) {
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inputsFrom = [ pkgs.linux_latest_with_llvm ];
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packages = commonInputs
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++ [ pkgs.rustup ]
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# for some reason, `llvmPkgs.stdenv` does not have `lld` or actually `bintools`
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++ [ llvmPkgs.bintools ];
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# Disable '-fno-strict-overflow' compiler flag because it causes the build to fail with the following error:
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# clang-16: error: argument unused during compilation: '-fno-strict-overflow' [-Werror,-Wunused-command-line-argument]
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hardeningDisable = [ "strictoverflow" ];
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env = rec {
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# just in case you want to disable building with the LLVM toolchain
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# **DO NOT SET THIS TO '0'**
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# **COMMENT IT OUT INSTEAD**
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# because, for some reason, setting `LLVM` to '0' still counts... :/
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LLVM = 1;
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# build related flags (for the script)
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BUILD_WITH_RUST = 1;
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# needed by Rust bindgen
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LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ llvmPkgs.libclang.lib ];
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# because `grep gcc "$(nix-store -r $(command -v clang))/nix-support/libcxx-cxxflags"` matches
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# but `grep clang "$(nix-store -r $(command -v clang))/nix-support/libcxx-cxxflags"` **DOES NOT MATCH**
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KCFLAGS = "-isystem ${LIBCLANG_PATH}/clang/${llvmVersion}/include";
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} // globalBuildFlags;
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# **ONLY UNCOMMENT THIS IF YOU ARE _NOT_ USING HOME-MANAGER AND GET LOCALE ERRORS/WARNINGS**
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# If you are using home-manager, then add the following to your ~/.bashrc
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# `source $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh`
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#LOCALE_ARCHIVE_2_27 = "${pkgs.glibcLocales}/lib/locale/locale-archive";
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};
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withGNU = pkgs.mkShell {
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inputsFrom = [ pkgs.linux_latest ];
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packages = commonInputs;
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env = {
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# build related flags (for the script)
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BUILD_WITH_RUST = 0;
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} // globalBuildFlags;
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};
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});
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};
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}
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