Linux kernel cannot be built in NixOS

[Freed-Wu]

Xmake Version

v2.9.1+20240422

Operating System Version and Architecture

6.9.1

Describe Bug

$ git clone --depth=1 --recursive https://github.com/xmake-io/xmake
$ cd xmake/tests/projects/linux/driver/hello_custom
$ nix-env -iA nixos.linuxPackages_latest.kernel.dev
$ nix eval --impure --expr '"${(import <nixpkgs> {}).linuxPackages_latest.kernel.dev}"'
"/nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev"
$ xmake -f --linux-headers=/nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1/source
$ xmake -rv
[ 40%]: cache compiling.release src/add.c
/nix/store/9bv7dcvmfcjnmg5mnqwqlq2wxfn8d7yi-gcc-wrapper-13.2.0/bin/gcc -c -m64 -DKBUILD_MODNAME=\"hello\" -DKBUILD_BASENAME=\"add\" -o build/.objs/hello/linux/x86_64/release/src/add.c.o src/add.c
[ 60%]: cache compiling.release src/hello.c
/nix/store/9bv7dcvmfcjnmg5mnqwqlq2wxfn8d7yi-gcc-wrapper-13.2.0/bin/gcc -c -m64 -DKBUILD_MODNAME=\"hello\" -DKBUILD_BASENAME=\"hello\" -o build/.objs/hello/linux/x86_64/release/src/hello.c.o src/hello.c
error: src/hello.c:1:10: fatal error: linux/init.h: No such file or directory
    1 | #include <linux/init.h>
      |          ^~~~~~~~~~~~~~
compilation terminated.

I think that is because NixOS's linux headers is a little different:

That is ArchLinux:

$ ls /usr/src/linux -dl
Permissions Size User Date Modified Name
lrwxrwxrwx     - root 18 May 00:56   /usr/src/linux -> ../lib/modules/6.9.1-arch1-1/build
$ ls /usr/src/linux -l
 arch    crypto    include   kernel                   localversion.20-pkgname   Module.symvers   scripts    System.map   version   vmlinux.h
 block   drivers   init      lib                      Makefile                  net              security   tools        virt
 certs   fs        Kconfig   localversion.10-pkgrel   mm                        samples          sound      usr          vmlinux

This is NixOS:

$ nix eval --impure --expr '"${(import <nixpkgs> {}).linuxPackages_latest.kernel.dev}"'
"/nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev"
$ ls /nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1
 build   source
$ ls /nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1/build
 arch   include   kernel   Makefile   Module.symvers   scripts   source   tools
$ ls /nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1/source
 arch    certs    Documentation   include   io_uring   kernel   Makefile   net    samples   security   tools   virt
 block   crypto   fs              init      ipc        lib      mm         rust   scripts   sound      usr
$ ls /nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1/build/source -dl
Permissions Size User Date Modified Name
lrwxrwxrwx     - root  1 Jan  1970   /nix/store/cajf6mwyfm0r8dpa12chcj2hpla1yzk0-linux-6.9.1-dev/lib/modules/6.9.1/build/source -> ../source

Expected Behavior

Can work.

Project Configuration

xmake test example.

Additional Information and Error Logs

If we cannot find some files in /nix/store/XXX/lib/modules/6.9.1/build, we should search /nix/store/XXX/lib/modules/6.9.1/build/source as a fallback for NixOS.

[waruqi]

you can try use linux-header from xmake-repo.

https://github.com/xmake-io/xmake/blob/d396bdbcd399d1bd9dd8ea94bfbe5a3bba7b3717/tests/projects/linux/driver/hello/xmake.lua#L1

[Freed-Wu]

Now xmake f --linux-headers=/nix/store/pmaqx4znv06123vz8q75w0mnbl3arwaq-linux-6.10.2-dev/lib/modules/6.10.2/build can work.