http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54554
--- Comment #2 from Dimitris Papavasiliou <dpapavas at gmail dot com> 2012-09-12 10:19:20 UTC --- Specifying -O does indeed produce a warning if i is not assigned a constant value (for instance i = rand(); ). Omitting -O and specifying -Wmaybe-uninitialized does not produce anything though. Does that mean that warnings about possibly uninitialized variables are not supported at all, even if explicitly requested by the user when not optimizing? If that is the case then perhaps this should be documented in the manual. The latest version just mentions this for -Wmaybe-uninitialized: "This warning is enabled by -Wall or -Wextra."
