reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/AsahiLinux/linux/commit/0478f42cdb343787e247a07f23e58ec516f8dacf
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux asahi-wip
        git checkout 0478f42cdb343787e247a07f23e58ec516f8dacf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 prepare