dexonsmith added a comment.

> We use the `-Wc++NN-compat-` prefix on all the other subwarnings of 
> `-Wc++NN-compat` warnings

Interesting; I thought I saw a counter-example recently, and took that as the 
rule (although I can't for the life of me remember what it was).  
`-Wc++NN-compat-mangling` SGTM though.

> Just curious, though: what is the motivation for enabling the rest of 
> `-Wc++1z-compat` but not this part? This seems a lot more serious than the 
> other warnings in the group. (Regardless, I think this patch is useful for 
> the opposite: enabling just this one warning without the rest...)

A user is recompiling the codebase as a unit so binary compatibility doesn't 
matter, but language semantics do.


https://reviews.llvm.org/D34251



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