reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/84bee1ee550645aac22646868ec31dd4bb92686f
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov BITS4
        git checkout 84bee1ee550645aac22646868ec31dd4bb92686f

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash lib/