reproduce (this is a W=1 build): git clone https://github.com/intel/lkp-tests.git ~/lkp-tests # install um cross compiling tool for clang build # apt-get install binutils-um-linux-gnu git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git git fetch tip x86/core git checkout tip/x86/core b4 shazam https://lore.kernel.org/r/20240221161431.8245-4-tzimmermann@suse.de # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um SHELL=/bin/bash