[PATCH] implement -Wold-style-cast

[Ondřej Hošek]

Hello,

the attached patch implements the old-style cast warning known from GCC
(activated via -Wold-style-cast). The warning is triggered by C-style
(parentheses) casts in C++ code.

This patch has been motivated by a thread on Apple's Objective-C
language mailing list. [1] I have also submitted it as bug #18012. [2]

A warning is emitted on:
* parentheses casts in C++ or Objective-C++ code

No warning is emitted on:
* parentheses casts in C or Objective-C code
* (static|dynamic|reinterpret)_casts in C++ or Objective-C++ code
* functional-style casts in C++ or Objective-C++ code

This matches GCC behavior.

Cheers,
~~ Ondra

[1] http://lists.apple.com/archives/objc-language/2013/Nov/msg00018.html
[2] http://llvm.org/bugs/show_bug.cgi?id=18012
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