https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108646
--- Comment #5 from Jonny Grant <jg at jguk dot org> --- (In reply to Jonathan Wakely from comment #4) > (In reply to Jonny Grant from comment #3) > > Is it worth -Wnonnull emitting a warning message that it needs optimization > > to get the needed data flow analysis? > > No, there are dozens of warnings that work poorly, or not at all, unless > optimization is enabled. It's in the manual. > > "The effectiveness of some warnings depends on optimizations also being > enabled. For example -Wsuggest-final-types is more effective with link-time > optimization and some instances of other warnings may not be issued at all > unless optimization is enabled. While optimization in general improves the > efficacy of control and data flow sensitive warnings, in some cases it may > also cause false positives." Ok I see. Thank you for clarifying.
