reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/geoff/ps3-linux.git/commit/?id=5162af76a52ec22d2272f93740eca08bb035c06f
        git remote add geoff-ps3 https://git.kernel.org/pub/scm/linux/kernel/git/geoff/ps3-linux.git
        git fetch --no-tags geoff-ps3 ps3-queue-v6.8
        git checkout 5162af76a52ec22d2272f93740eca08bb035c06f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/platforms/ps3/