[PATCH] D131057: [Sema] -Wformat: support C23 printf %b %B

[Fangrui Song via Phabricator via cfe-commits]

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Close #56885. %b %B are from WG14 N2630 and supported by glibc from 2.35 onwards and latest Android bionic.

Like GCC, we don't test library support.

GCC 12 -Wformat -pedantic emits a warning:

> warning: ISO C17 does not support the ‘%b’ gnu_printf format [-Wformat=]

The behavior is not ported (and it's unclear to me how to implement it).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131057

Files:
  clang/include/clang/AST/FormatString.h
  clang/lib/AST/FormatString.cpp
  clang/lib/AST/PrintfFormatString.cpp
  clang/test/Sema/format-strings-fixit.c
  clang/test/Sema/format-strings.c
  clang/test/SemaObjC/format-strings-objc.m

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