reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/cilium/linux/commit/e6e60486969729b6c3a87c463e5ee9db9fdd797a
        git remote add cilium https://github.com/cilium/linux.git
        git fetch --no-tags cilium pr/netkit-xdp
        git checkout e6e60486969729b6c3a87c463e5ee9db9fdd797a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash