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List:       boost
Subject:    Re: [boost] Proposal for #pragma once support
From:       Maik Beckmann <beckmann.maik () googlemail ! com>
Date:       2009-06-09 19:23:27
Message-ID: 200906092123.27949.Beckmann.Maik () googlemail ! com
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Emil Dotchevski schrieb am Dienstag 09 Juni 2009 um 21:00:
> On Tue, Jun 9, 2009 at 11:19 AM, Zachary Turner <divisortheory@gmail.com> 
wrote:
> > #if defined(_MSC_VER) && (_MSC_VER >= 1020)
> > #pragma once
> > #endif
> >
> > That's all it takes.  Everybody benefits.
>
> I'm sorry but what problem are we trying to solve with this? Does
> compiling Boost take too much time? If the answer is yes, is #pragrma
> once the best solution we can come up with? :)

While having no experience with "#pragma once", my impression is that it has 
an positive effect if the filesystem is slow when touching many small files, 
which I painfully experience on MS.Windows (at least on XP, dunno if Vista and 
Windows7 suffer from this as well).  

The point of Zachary's approach is being a non intrusive no brainer solution.  
All the user has to do is to add a definition to the command line via his/her 
build system.  

Well, given that there is an measurable effect on real boost using code.  I 
suggest we wait until Zachary wrote the script and did benchmarks on some of 
the plenty files at the libs test dirs.


-- Maik
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