reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add openeuler https://gitee.com/openeuler/kernel.git
        git fetch --no-tags openeuler openEuler-1.0-LTS
        git checkout 2dbb9b9e6df67d444fbe425c7f6014858d337adf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/power/ block/ drivers/iio/chemical/ drivers/mtd/ drivers/rtc/ drivers/soc/renesas/ drivers/spi/ fs/adfs/ fs/affs/ fs/befs/ fs/dlm/ fs/ext2/ fs/hpfs/ fs/ocfs2/ fs/ufs/ kernel/ lib/ mm/ net/