reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install um cross compiling tool for clang build
        # apt-get install binutils-um-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git/commit/?id=5bc3e6ca41aa7982442c7c2002d339f1a3343eae
        git remote add ath https://git.kernel.org/pub/scm/linux/kernel/git/ath/ath.git
        git fetch --no-tags ath pending
        git checkout 5bc3e6ca41aa7982442c7c2002d339f1a3343eae
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um SHELL=/bin/bash drivers/net/wireless/ath/ath12k/