reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git/commit/?id=3bf2a5359b0bde22418705ec862ac5077312e4c2
        git remote add broonie-misc https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git
        git fetch --no-tags broonie-misc spi-6.12
        git checkout 3bf2a5359b0bde22418705ec862ac5077312e4c2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash