Failure to compile world

[Alex Kuster]

http://clang.llvm.org/docs/LanguageExtensions.html#__builtin_unreachable
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1453.htm

Apparently this is the problem:

> _Noreturn void     abort(void);
> // [...] more declarations
> _Noreturn void     exit(int);

Those noreturns are supposed to be written with GCC syntax and this can 
be workarounded with this :

> |#define _Noreturn __attribute__ ((noreturn))|
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Maybe the compiler can be checked in preprocessor and add that compatibility line so the code compiles correctly
||Any opinion on this?|

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Thanks for your time and for reading !
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