reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add mkl-can-next https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git
        git fetch mkl-can-next testing
        git checkout mkl-can-next/testing
        b4 shazam https://lore.kernel.org/r/20240530105801.3930087-1-martin@geanix.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/net/can/m_can/