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/alexghiti/linux.git/commit/?id=ed78e03a2fdff0a8ac2ef2c1da5a7957cfdbf2c4
        git remote add alexghiti https://git.kernel.org/pub/scm/linux/kernel/git/alexghiti/linux.git
        git fetch --no-tags alexghiti alex-fixes_manual
        git checkout ed78e03a2fdff0a8ac2ef2c1da5a7957cfdbf2c4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.3.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash