[PATCH] D132568: [clang][Sema] check default argument promotions for printf

[YingChi Long via Phabricator via cfe-commits]

inclyc marked 2 inline comments as done.
inclyc added inline comments.


================
Comment at: clang/lib/AST/FormatString.cpp:367
+        case BuiltinType::Char_U:
+        case BuiltinType::Bool:
+          return Match;
----------------
aaron.ballman wrote:
> Isn't this a match promotion as well? e.g. `printf("%hhd", (_Bool)0);` where the `_Bool` is promoted to `int` but then cast back down to a char type (which seems rather unlikely to be a type confusion issue).
Hmm? `_Bool` just matches `AnyCharTy` perfectly. `MatchPromotion` means the types having **different** length and they can be considered as "partially matched" because of promotions). 

Isn't `_Bool`  and `AnyChar`  here just have the same length?


Repository:
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  https://reviews.llvm.org/D132568/new/

https://reviews.llvm.org/D132568