reproduce (this is a W=1 build):
        # https://github.com/dvyukov/linux/commit/1284e3723047cb5afd247f75c53de43efc18db82
        git remote add dvyukov https://github.com/dvyukov/linux
        git fetch --no-tags dvyukov pr/4
        git checkout 1284e3723047cb5afd247f75c53de43efc18db82

        # clang-23 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash kernel/