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Subject: Re: [Boost-build] Basic bjam issues
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-10-09 11:55:54


Alexander Sack wrote:
> - Why can't I use multiple build variants? I want to be able to build
> my project with certain features defined (i.e #define's). If I try to
> define a build variant for each one via:
> variant feature_support1 : <define>feature1 ;
> variant feature_support2 : <define>feature2 ;
> etc. I want to be able to turn them on and off from bjam command line

variants are considered mutually exclusive. The idea is that
bjam ... debug release will do both debug and release builds.

I suppose that you can make a separate feature for each.

feature feature_support1 : off on : implicit composite propagated ;
feature.compose <feature_support1>on : <define>feature1 ;

bjam feature_support1=on

> - I have a set of include files that need to be defined for some of
> the modules within my project. So I don't want to put an
> <include>blah in the top level Jamroot file, i.e. I want to define a
> alias or variable that I can substitute on some of my target rules to
> use this include.
> I tried the alias approach in the doc like so in my top-level Jamroot file
> alias common_includes : : : : <include>blah <include>blah1 ;
> etc.
> But this doesn't work. I can't seem to use it in any of my sub
> modules source lines nor can I use it in the usage-requiremetns. I
> then tried to use a simple variable and shell substitution but that
> let me to my first question.

You need to specify the project containing the target.

For example, in some_project/Jamfile you could refer to it as


Alternately if Jamroot contains a project id
project my_project ;
then you can use that id


In Christ,
Steven Watanabe

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