reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/stffrdhrn/linux/commit/723143ca525b2e2933b3a8886a3b9964f6c68fb6
        git remote add stffrdhrn https://github.com/stffrdhrn/linux.git
        git fetch --no-tags stffrdhrn or1k-fpu-regs
        git checkout 723143ca525b2e2933b3a8886a3b9964f6c68fb6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=openrisc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=openrisc SHELL=/bin/bash