reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git/commit/?id=2bd5d76830953093f5bd0634e552f71092aa743d
        git remote add chanwoo-extcon https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git
        git fetch --no-tags chanwoo-extcon extcon-testing
        git checkout 2bd5d76830953093f5bd0634e552f71092aa743d

        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=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/extcon/