Hi, On Tue, Nov 26 2019, Michael Witten wrote: > [...] > From what I've read, `-Wmaybe-uninitialized' is essentially > customized for `-O2',
I don't think that is true. It can be perfectly useful -O1 and there are many nasty false positives at -O2 too. > [...] > * If `-Wmaybe-uninitialized' is enabled by the user, then it > implies `-O2' computations. > > That is to say, when the user specifies: > > -Og -Wmaybe-uninitialized > > or: > > -Og -Wextra > > then the user is explicitly telling the compiler to do all > the optimizations of `-O2', but ONLY for the purpose of > implementing `-Wmaybe-uninitialized' If you try to implement this proposal, you'll quickly find that there is no such thing as like "do all optimizations only for purposes of a warning." You either perform a transformation or not and subsequent passes, such as pass_late_warn_uninitialized, start work where the previous ones left off. Martin
