reproduce (this is a W=1 build): git remote add masahiroy-kbuild https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git git fetch masahiroy-kbuild kbuild git checkout masahiroy-kbuild/kbuild b4 shazam https://lore.kernel.org/r/20240611175536.3518179-7-masahiroy@kernel.org # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 olddefconfig make W=1 O=build_dir ARCH=i386 olddefconfig