reproduce (this is a W=1 build):
        # https://github.com/thierryreding/linux/commit/1437bc669bcbba8be779d0aa04d07949d2c938c9
        git remote add thierryreding https://github.com/thierryreding/linux
        git fetch --no-tags thierryreding pmc
        git checkout 1437bc669bcbba8be779d0aa04d07949d2c938c9

        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=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash