https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271
--- Comment #3 from David Binderman <dcb314 at hotmail dot com> --- Even more: 7. src/trunk/gcc/lra-spills.c:240:9: warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses] Source code is || !FRAME_GROWS_DOWNWARD == STACK_GROWS_DOWNWARD ? diff : -diff); Looks like #6 8. trunk/gcc/sel-sched-ir.c:6189:30: warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses] Source code is if (bb->loop_father && !bb->loop_father->num == 0 Maybe if (bb->loop_father && bb->loop_father->num != 0 9. trunk/gcc/tree-vect-data-refs.c:1833:11: warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses] Source code is if (!LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo)) but #define LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT(L) \ (L)->may_misalign_stmts.length () > 0 Maybe #define LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT(L) \ ((L)->may_misalign_stmts.length () > 0) might fix the problem. 10. trunk/gcc/tree-vect-loop.c:1795:14: warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses] trunk/gcc/tree-vect-loop.c:1796:17: warning: logical not is only applied to the left hand side of this comparison [-Wlogical-not-parentheses] Source code is && ((!LOOP_REQUIRES_VERSIONING_FOR_ALIAS (loop_vinfo) && !LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo)) Maybe something like #define LOOP_REQUIRES_VERSIONING_FOR_ALIAS(L) \ ((L)->may_alias_ddrs.length () > 0) might solve the problem.