This error occurs with clang-3.1 (port:clang-3.1) or later (Xcode-4.6).
clang of Xcode 4.5 looks earlier revision than clang-3.1 release from llvm.org.

On Mon, 25 Feb 2013 22:39:31 -0600, Ryan Schmidt wrote:
> 
> On Feb 25, 2013, at 08:46, [email protected] wrote:
> 

>> +# clang31.diff: build fails with Xcode-4.6 (clang-3.1)
>> +#     https://bugs.ruby-lang.org/issues/7946
> 
> Actually Xcode 4.6 ships with:
> 
> Apple LLVM version 4.2 (clang-425.0.24) (based on LLVM 3.2svn)
> 
> Though you might have an older version if you have not opened Xcode, 
> gone to the Preferences window, to the Downloads tab, and upgraded 
> your command line tools.
> 

-- 
kimura wataru
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