[PATCH] D18296: [Sema] Handle UTF-8 invalid format string specifiers

[Bruno Cardoso Lopes via cfe-commits]

bruno created this revision.
bruno added a reviewer: rsmith.
bruno added subscribers: cfe-commits, dexonsmith.

Improve invalid format string specifier handling by printing out invalid specifiers characters with \x, \u and \U. Previously clang would print gargabe whenever the character is unprintable.
    
Example, before:
  NSLog(@"%\u25B9", 3); => warning: invalid conversion specifier ' [-Wformat-invalid-specifier]
after:
  NSLog(@"%\u25B9", 3); => warning: invalid conversion specifier '\u25b9' [-Wformat-invalid-specifier]

http://reviews.llvm.org/D18296

Files:
  lib/Analysis/PrintfFormatString.cpp
  lib/Sema/SemaChecking.cpp
  test/SemaObjC/format-strings-objc.m

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