reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git/commit/?id=713acdda5f818fb4f2286238a4f9f1f5f519b9da
        git remote add xiang-erofs https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
        git fetch --no-tags xiang-erofs dev-test
        git checkout 713acdda5f818fb4f2286238a4f9f1f5f519b9da

        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=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash fs/erofs/