reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/nunojsa/linux/commit/813decf00f69c8e38c0b78cbd93c9a2b332c8bdf
        git remote add nsa https://github.com/nunojsa/linux
        git fetch --no-tags nsa b4/dev-iio-backend-add-debugfs
        git checkout 813decf00f69c8e38c0b78cbd93c9a2b332c8bdf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash