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Re: [Bug c++/16190] make -Wnon-virtual-dtor more sophisticated

You Wrote
> Besides: why -Weff-c++ at all?
If it were up to me, I remove it out of the picture.

> -Wall means "all warnings", that's why that name was chosen. Now, it is

Yes, but the current warning is more annyoing than useful and it
does not even qualify for -Wall by the most genereous measurements.

I thik the right action is to fix the warning to be
generated only if we have delete expression or a class
to destructor.

And by the way, Nathan kindly took on filling this PR
after I made a suggestion and we discussed the issue on V3
list.

-- Gaby
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