reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/nbdd0121/linux/commit/0fe9d2aea0403e050b76ef4dc17f1a3b70698025
        git remote add nbdd0121 https://github.com/nbdd0121/linux
        git fetch --no-tags nbdd0121 thin-lto
        git checkout 0fe9d2aea0403e050b76ef4dc17f1a3b70698025
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 prepare