Re: [jamboost] patch boost-base.jam project wide settings

From: Thomas Witt (witt_at_[hidden])
Date: 2002-02-26 11:59:23

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Rene,

On Tuesday 26 February 2002 16:59, Rene Rivera wrote:
> Don't know about the with-command-file stuff, but defining project wide
> requirements is already supported by the use of "variant". And is the main
> reason I extented the "variant" rule. Your example could be written as such
> instead...

As you might guess I was not aware of this extension.

>
>
> variant TplBase
>
> <include>../myinclude
> <define>TEMPLATE
> ;
>
>
> variant TplDerived : TplBase
>
> <include>../anotherinclude
> <define>DERIVED_TEMPLATE
> ;
>
>
> variant my-debug : TplDerived : ;
> variant my-release : TplDerived : ;

Where comes the debug and release in ?

>
> exe MyExe
>
> main.cpp
>
>
> my-debug
> ;
>
> >I am using template in two projects and it reduces the maintenance work
> >by at least an order of magnitude. Currently template covers only
> >requirements but I think it can be extended to cover build settings to.
> > The need for requirements was just more pressing :-). If this goes in I
> > will happily update the documentation.
>
> Same reason I did the variant extension :-) It makes it a brease to control
> the settings of the 20 or so disparate targets in my project.
>
> I'm not sure about your idea of also "globally" specifying the build
> settings. Could explain how that might work? Any advantages over the
> current system?

What templates do is maintain a variable that holds requirements. For each 
target prepend eventual template req's to target req's. The idea is to do the 
same for build settings.

The advantage I see is that template is more fine grained than variant. Using 
variant would mean loads of uneccessary req's(think library-path) for most of 
the targets. Furthermore all main-targets in a project have to use the same 
variant whereas they are free to select the template.

Thomas

>
>
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- -- 
Dipl.-Ing. Thomas Witt
Institut fuer Verkehrswesen, Eisenbahnbau und -betrieb, Universitaet Hannover
voice: [phone] - 4273, fax: [phone]
http://www.ive.uni-hannover.de
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