reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/4878c61929d676359794533c9e16d420c5f24b26
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 7.1/prjc
        git checkout 4878c61929d676359794533c9e16d420c5f24b26

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash kernel/