https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117476
Sam James <sjames at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |sjames at gcc dot gnu.org --- Comment #3 from Sam James <sjames at gcc dot gnu.org> --- (In reply to David Binderman from comment #2) > Partially reduced code: > <source>:59:20: warning: iteration 6 invokes undefined behavior [-Waggressive-loop-optimizations] 59 | crc32_tab[i] = crc; | ~~~~~~~~~~~~~^~~~~ <source>:48:16: note: within this loop 48 | for (i; i < 256; i++) { | ~~^~~~~ Please reduce with something like: -Werror=uninitialized -Werror=aggressive-loop-optimizations -Werror=sequence-point.