Re: [Boost-build] [Boost-users] [boost-build]how to configure custom targets

Subject: Re: [Boost-build] [Boost-users] [boost-build]how to configure custom targets
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2009-01-27 14:29:14

Sandeep Gupta wrote:

> On Tue, Jan 27, 2009 at 10:08 AM, Vladimir Prus <ghost_at_[hidden]> wrote:
> 
>>
>> On Tuesday 27 January 2009 09:40:32 Sandeep Gupta wrote:
>> > Hi Steven,
>> >  Thanks.  I should be able to fix it using this info. However I have hit
>> > another, but somewhat related, roadblock.  Tried  the documentation but
>> > failed to find relevant snippets.
>> >
>> > Using generators i have created these two custom rules
>> > 1) mp a : a.gp ;
>> >             which converts a.gp to a.mp
>> > 2) mps a : a.mp
>> >             which converts a.mp to a.mps
>> >
>> > Invoking bjam complains "unable to find target a.mp".  The problem is that I
>> > am unable to specify that "a.mp is generated by rule 1".
>> > In case i am missing something obvious please point me to relevant portion
>> > of the documentation.
>>
>>
>> Sandeep,
>>
>> Please provide a minimal project reproducing this problem. The above description
>> leaves enough freedom to make it impossible to diagnose the problem.
>>
>> Thanks,
>> Volodya
>>
>>
> 
> 
>  Hi Volodya,
> 
> Let me explain the project:
> File mpTOmps.jam has following entry
> import type ;
> type.register MP : mp ;
> type.register MPS : mps ;
> import generators ;
> generators.register-standard mp.inline-file : MP : MPS ;
> actions inline-file
> {
> "./tomps.sh" $(>) $(<)
> }
> 
> 
> This allows me to write in jamfile:
> mps a : a.mp  ;
> 
> Similarly file gpTOmp.jam has following entry
> import mpTOmps;
> import type ;
> type.register GP : gp ;
> import generators ;
> generators.register-standard gp.inline-file : GP : MP ;
> actions inline-file
> {
> "gnuplot" $(>)
> }
> Hence i can write mp  a : x.gp ; where "gnuplot x.gp" will produce a.mp.
> 
> Now I am getting error "No best alternative for a".  I think the
> problem is that somehow i have to express that a.mps is dependent upon
> a.mp. It could be that I am wrong and overlooking something very
> trivial.

When you define two targets with the same name, as you do here, Boost.Build
believe these are two alternatives, to be used in different cases. Does:

        mps a.mps : a.mp  ;
        msp a.mp : x.gp ;

work?

- Volodya