On Wed, 1 Apr 2026 08:15:22 +0800 kernel test robot <[email protected]> wrote:
> Hi, > > kernel test robot noticed the following build errors: > > [auto build test ERROR on next-20260327] > > url: > https://github.com/intel-lab-lkp/linux/commits/david-laight-linux-gmail-com/fortify-replace-__compiletime_lessthan-with-statically_true/20260331-041123 > base: next-20260327 > patch link: > https://lore.kernel.org/r/20260330132003.3379-3-david.laight.linux%40gmail.com > patch subject: [PATCH next 2/3] fortify: Optimise strnlen() > config: x86_64-buildonly-randconfig-001-20260331 > (https://download.01.org/0day-ci/archive/20260401/[email protected]/config) > compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project > 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) > reproduce (this is a W=1 build): > (https://download.01.org/0day-ci/archive/20260401/[email protected]/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version > of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <[email protected]> > | Closes: > https://lore.kernel.org/oe-kbuild-all/[email protected]/ > > All errors (new ones prefixed by >>): > > >> ld.lld: error: undefined symbol: __fortify_undefined > >>> referenced by fortify-string.h:290 (include/linux/fortify-string.h:290) > >>> vmlinux.o:(parse_early_param) > >>> referenced by fortify-string.h:218 (include/linux/fortify-string.h:218) > >>> vmlinux.o:(parse_early_param) > >>> referenced by fortify-string.h:290 (include/linux/fortify-string.h:290) > >>> vmlinux.o:(setup_boot_config) > >>> referenced 2103 more times > I'm not sure how this can happen. The references are all behind a __builtin_constant_p() check. I haven't tested the actual config, but allmodconfig compiled for me with clang 18. David
