Why not just implement the clang feature checking macros?
http://clang.llvm.org/docs/LanguageExtensions.html#feature_check

Besides fixing the whole problem that this thread identifies, it doesn't 
require cramming tons of macros into the initial preprocessor state, speeding 
up compiler startup time.

-Chris

On Jan 21, 2012, at 12:14 AM, Basile Starynkevitch <bas...@starynkevitch.net> 
wrote:

> On Sat, 21 Jan 2012 01:32:29 +0100
> Vincent Lefevre <vincent+...@vinc17.org> wrote:
> 
>> On 2012-01-20 23:28:07 +0000, Jonathan Wakely wrote:
>>> May I politely suggest that this is the wrong place to complain about
>>> other compilers pretending to be GCC :)
>> 
>> I think that's the fault of GCC, which should have defined a macro
>> for each extension.
> 
> 
> I agree with that. And I even hope that if GCC 4.7 defined several macros, 
> one for each
> extensions, like e.g.
>   __GCC_HAVE_INDIRECT_GOTO__  for the goto *x; feature
>   __GCC_HAVE_STATEMENT_EXPR__ for statement expressions
> etc then perhaps in several years other compilers would do likewise. We just 
> have to
> document our features and their corresponding macros...
> 
> Regards. 
> 
> 
> -- 
> Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
> email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
> 8, rue de la Faiencerie, 92340 Bourg La Reine, France
> *** opinions {are only mine, sont seulement les miennes} ***

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