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Subject: RE: C++ name with leading underscore character not Compiling
Date: Mon, 16 Apr 2007 14:47:52 +0100
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From: "Adye, TJ \(Tim\)" <T.J.Adye@rl.ac.uk>
To: "Dave Korn" <dave.korn@artimi.com>, <cygwin@cygwin.com>
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Hi Dave,

Dave Korn wrote 16 April 2007 14:28:-
> 
> On 16 April 2007 13:14, Adye, TJ (Tim) wrote:
> 
> > I'm a bit surprised this isn't flagged by the compiler (it 
> > warns you about lots of other non-standard usages), though I guess
it 
> > would be a bit ugly to implement (the compiler would have to 
> > distinguish between usage in a standard header and other code).
> 
>   Actually, the compiler already has a good deal of knowlege 
> about what constitute system headers and what constitute user 
> headers: see '-Wsystem-headers' in the docs.  So I think that 
> it wouldn't actually be hard to implement, and I may even 
> take a look at doing so myself.

That would certainly be an interesting improvement.

An alternative might be to distinguish between <> and "" includes. My
concern was more that the determination of system headers is done in the
preprocessor, while the type of identifier is determined later by the
compiler. But I guess the latter knows about the former (eg. for error
messages). It's a long time since I delved into the GCC sources...

Tim.

===========================  cut here  ============================
 Tim Adye      T.J.Adye@rl.ac.uk       http://hepunx.rl.ac.uk/~adye
 BaBar/Atlas Groups, Particle Physics Dept, Rutherford Appleton Lab

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