[GD-General] Redundant Include Guards

[Parveen K. <pk...@sf...>]

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Sticking with the theme of compile times.

I'm reading Large-Scale C++ Software Design at the moment.  The author 
recommends redundant include guards in .h files:

// foo.h
#ifndef _INCLUDE_FOO_H_
#define _INCLUDE_FOO_H_


#ifndef _INCLUDE_BAR_H_
#include "bar.h"
#endif

#ifndef _INCLUDE_VECTOR_
#include <vector>
#define _INCLUDE_VECTOR_
#endif

////
....
////

#endif

So I tried this for a project of mine that consists of about 10KLOC. 
Compiling with gcc3.2 I saw no difference in compile times.

Are compilers like gcc and msvc smart enough to figure stuff like this 
out?  Or is my project just not large enough?  The book was written way 
back in 1996, so I'm figuring some of the advice may be a little out of 
date.

Parveen

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