reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/commit/?id=51104c19d8570eb23208e08eac0e9ae09ced1c15
        git remote add shuah-kselftest https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git
        git fetch --no-tags shuah-kselftest kunit
        git checkout 51104c19d8570eb23208e08eac0e9ae09ced1c15
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash