reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/d1f7b869b59d7f31d1d0ab5021809fcc11b69ca7
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review xur-google-com/kbuild-move-vmlinux-a-build-rule-to-scripts-Makefile-vmlinux_a/20260403-055837
        git checkout d1f7b869b59d7f31d1d0ab5021809fcc11b69ca7

        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=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 distclean