reproduce (this is a W=1 build):
        git remote add axboe https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git
        git fetch axboe for-next
        git checkout axboe/for-next
        b4 shazam https://lore.kernel.org/r/148efba2-a0b6-47d7-ac76-b19d2f4b696c@I-love.SAKURA.ne.jp

        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=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash