[Bug tree-optimization/60165] "may be used uninitialized" warning with -O3 but not with -O2

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60165

--- Comment #18 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
OK, but then, this means that the first sentence of the -Wmaybe-uninitialized
documentation is incorrect. That's probably the "there exists" that is
problematic, because of the possible difference of what actually exists and
what the compiler sees.