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From: Jim Tilander (jim.tilander_at_[hidden])
Date: 2005-07-06 10:24:45

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Reply: Pedro Ferreira: "Re: [jamboost] Finding out where output files are and changing it + precompiled headers"

Vladimir,

The automatic mode in visual studio is basically useless, it's often slower
than compiling without a precompiled header. I think MS recommends not to
use it at all. The crazy part is that it's the default behaviour if you
create a new project with a wizard in visual :) I'll take a look at how to
add the precompiled header stuff to msvc.jam, the manual version of it.

I'm also curious, does anyone actually use the #pragma hdrstop? I've never
seen any real use for it, but I'm probably missing something here since it
seems to spring up...

On 7/6/05, Vladimir Prus <ghost_at_[hidden]> wrote:
>
> Hi Andrey,
> Hi Jim,
>
> > > 2. In my compiler flags <cflag> I'd like to reference the output
> > > directory (the one we changed in 1). This is for this specific
> instance
> > > for precompiled headers, so the actual flag I want to pass is
> something
> > > like this (but of course I don't know the proper variablenames):
> > >
> > > <cflag>-Fp$(intermediate_path)/$(project_name).pch
> >
> > It isn't a good idea to specify cflags manually in jamfile. It's better
> > to patch msvc.jam toolset definition file and create features like
> >
> > <pch>off|use|create|hdrstop
> > <pch-header>StdAfx.h
> > <pch-db>StdAfx.pch
> >
> > Also you need to track dependencies correctly: all files with <pch>use
> > should depend on StdAfx.pch, and stdafx.cpp should create StdAfx.pch
> > output.
> >
> > Can someone more fluent in bbv2 tell me is this a lot of work?
>
> This PCH thing becomes a common request. Recall that msvc has both
> "automatic"
> pch mode, that requires, IIRC, a single switch, and "manual" mode, that
> requires creating PCH once, and then using it from other targets. I recall
>
> I've suggested the following syntax for the manual mode:
>
> pch stl : stl.h :
> exe my : my.cpp : <pch>stl ;
>
> I think this should not be too hard to add.
>
> > Also I wonder how other compilers besides msvc implement precompiler
> > headers?
>
> borland, como, gcc
>
> > It looks like bcb can use #pragma hdrstop too.
>
> And, BTW, I forgot that #pragma hdrstop does ;-) Gcc does not have it,
> IIRC.
>
> - Volodya
>
> --
> Vladimir Prus
> http://vladimir_prus.blogspot.com
> Boost.Build V2: http://boost.org/boost-build2
>
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Content-Transfer-Encoding: quoted-printable
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Vladimir, 
 
The automatic mode in visual studio is basically useless, it's often
slower than compiling without a precompiled header. I think MS
recommends not to use it at all. The crazy part is that it's the
default behaviour if you create a new project with a wizard in visual
:) I'll take a look at how to add the precompiled header stuff to
msvc.jam, the manual version of it. 
 
I'm also curious, does anyone actually use the #pragma hdrstop? I've
never seen any real use for it, but I'm probably missing something here
since it seems to spring up... 
 
/j <div>On 7/6/05, Vladimir Prus <<a href="mailto:ghost_at_[hidden]">ghost_at_[hidden]</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">

<tt>
Hi Andrey, 
Hi Jim, 
 
> > 2. In my compiler flags <cflag> I'd like to reference the output 
> > directory (the one we changed in 1). This is for this specific instance 
> > for precompiled headers, so the actual flag I want to pass is something 
> > like this (but of course I don't know the proper variablenames): 
> > 
> > <cflag>-Fp$(intermediate_path)/$(project_name).pch 
> 
> It isn't a good idea to specify cflags manually in jamfile. It's better 
> to patch msvc.jam toolset definition file and create features like 
> 
> <pch>off|use|create|hdrstop 
> <pch-header>StdAfx.h 
> <pch-db>StdAfx.pch 
> 
> Also you need to track dependencies correctly: all files with <pch>use 
> should depend on StdAfx.pch, and stdafx.cpp should create StdAfx.pch 
> output. 
> 
> Can someone more fluent in bbv2 tell me is this a lot of work? 
 
This PCH thing becomes a common request. Recall that msvc has both "automatic" 
pch mode, that requires, IIRC, a single switch, and "manual" mode, that 
requires creating PCH once, and then using it from other targets. I recall 
I've suggested the following syntax for the manual mode: 
 
  pch stl : stl.h : 
  exe my : my.cpp : <pch>stl ; 
 
I think this should not be too hard to add. 
 
> Also I wonder how other compilers besides msvc implement precompiler 
> headers? 
 
borland, como, gcc 
 
> It looks like bcb can use #pragma hdrstop too. 
 
And, BTW, I forgot that #pragma hdrstop does ;-) Gcc does not have it, IIRC. 
 
- Volodya 
 
-- 
Vladimir Prus 
<a href="http://vladimir_prus.blogspot.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://vladimir_prus.blogspot.com> 
Boost.Build V2: http://boost.org/boost-build2 
</tt><div>

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In reply to: Vladimir Prus: "Re: [jamboost] Finding out where output files are and changing it + precompiled headers"
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