[Bug c++/109364] Missing return statement in a non void function gives only a warning but produces a forced crash.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109364

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
That is because -funreachable-traps is also enabled at -O0. And disabled for
-O1 and above except for -Og. That changes all places where you either
__builtin_unreachable or places which gcc inserts that like this place, gcc
will cause a trap.