[Bug middle-end/118097] [15 regression] recent bug with -O2, but not -O1

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118097

--- Comment #17 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Xi Ruoyao from comment #12)
> AFAIK -w suppresses -Werror=uninitialized. 

-w also appears to switch off -Werror=overflow.
This makes csmith a lot less useful.