reproduce (this is a W=1 build):
        git checkout a9682f53c2d1678b93a123cdaa260e955430bc5c
        b4 shazam https://lore.kernel.org/r/20251013-iio-tests-fixed-point-new-kunit-v1-1-7b52021925e6@baylibre.com
        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=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/iio/test/