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

[sjames at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Xi Ruoyao from comment #2)
> I cannot reproduce it locally, nor on godbolt:
> https://godbolt.org/z/rxf8Es1n5.

Try the C++ FE.