Re: [Boost-build] [bbv2] newbie: how to get value of afeatureinsidea rule

From: Daniel Einspanjer (deinspanjer_at_[hidden])
Date: 2006-02-08 10:21:40

Volodya,

Thank you so much for taking the time to teach me about how this new feature 
can help me.  I sincerely appreciate it.
Is it likely that this feature will be in the next release of V2 (which I 
believe is soon, right)?

Daniel

"Vladimir Prus" <ghost_at_[hidden]> wrote in message 
news:200602081014.01064.ghost_at_cs.msu.su...
> On Tuesday 07 February 2006 22:10, Daniel Einspanjer wrote:
>> Hrm. I'm sorry, I should have read the new FAQ entry before I posted 
>> this.
>>
>> The FAQ entry makes it sound like what I am wanting to do as a one liner 
>> is
>> not possible.
>> It sounds lie I would have to either create a feature.compose for every
>> customer I define or use conditional requirements for each customer I
>> define in the project section.
>>
>> Does this sound correct that there is no one liner I can write that won't
>> require maintenance when adding customers?
>
> Hi Daniel,
>
> until yesterday, you really had to use either feature.compose or 
> conditional
> requirements.
>
> Today, using CVS state or nightly build, you can use the following in 
> Jamroot:
>
>
>  import feature ;
>
>  feature.feature customer : first second : propagated ;
>
>
>  project
>     : requirements <conditional>@customer-define
>     ;
>
>  rule customer-define ( properties * )
>  {
>      local c = [ feature.get-values <customer> : $(properties) ] ;
>      return <define>CUSTOMER=$(c) ;
>  }
>
>
> The 'CUSTOMER' define will be added to all targets in Jamroot and in all 
> child
> Jamfiles. For convenience, I attach the testcase I've used. Go to the 
> "sub"
> directory and run "bjam -n". You should see the -DCUSTOMER=first option in
> the command line (if you're using gcc, with msvc the option goes to 
> response
> file, so you'd need #ifdef in the source to make sure everything works)
>
> - Volodya
>
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