[Bug sanitizer/120471] -fsanitize=undefined causes read of uninitialized variable when accessing element in an array at -O0 level

[xiaohuba2021 at 163 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120471

--- Comment #4 from xiaohuba2021 <xiaohuba2021 at 163 dot com> ---
(In reply to Xi Ruoyao from comment #2)
> I cannot reproduce it locally, nor on godbolt:
> https://godbolt.org/z/rxf8Es1n5.

switch the language to c++ successfully reproduce it:
https://godbolt.org/z/z6WhKKa74