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/conor/linux.git/commit/?id=cf1d0043a35569e127181d268f39f200206a5ee4
        git remote add conor https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git
        git fetch --no-tags conor auto-update-info
        git checkout cf1d0043a35569e127181d268f39f200206a5ee4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/firmware/microchip/