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

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-02-08 02:14:00

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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