reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/ljs/linux.git/commit/?id=c096548eb67d62de7340454d8d0fd621687d196a
        git remote add ljs https://git.kernel.org/pub/scm/linux/kernel/git/ljs/linux.git
        git fetch --no-tags ljs v3-build-speed-up
        git checkout c096548eb67d62de7340454d8d0fd621687d196a

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 ARCH=sh olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 ARCH=sh