https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66397
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Comment on attachment 35691 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35691 testcase, warns with gcc-6 -c -O2 -fsanitize=undefined Except it is undefined behavior to have one element before the start of an array. And that is why it is warning. Does not matter if there is a ++ later on.
