[Bug c++/87656] Useful flags to enable with -Wall or -Wextra

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87656
Bug 87656 depends on bug 87729, which changed state.

Bug 87729 Summary: Please include -Woverloaded-virtual in -Wall
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87729

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED