Re: [Boost-build] How to select a source file by <target-os>

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2008-07-22 12:45:06

Jonathan Biggar wrote:
> Jurko Gospodnetic' wrote:

>>> rule add-os-specific-sources ( properties * )
>>> {
>>>     local target-os = [ MATCH "^<target-os>(.*)$" : $(properties) ] ;
>  >>     return
>>>     $(target-os)-specific-source-1
>>>     $(target-os)-specific-source-2
>>>     $(target-os)-specific-source-3
>>>     $(target-os)-specific-source-4
>>>     $(target-os)-specific-source-5 ;
>>> }
> 
> Hmmm.  Should that be:
> 
> rule add-os-specific-sources ( properties * )
> {
>     local target-os = [ MATCH "^<target-os>(.*)$" : $(properties) ]  ;
>     return
>       <source>$(target-os)-specific-source-1
>       <source>$(target-os)-specific-source-2
>       <source>$(target-os)-specific-source-3
>       <source>$(target-os)-specific-source-4
>       <source>$(target-os)-specific-source-5 ;
> }
> 
> Or am I misunderstanding something?

You understand correctly... But the "faster" way to do that would be:

import property ;

rule add-os-specific-sources ( properties * )
{
   local target-os = [ property.select <target-os> : $(properties) ] ;
   local sources = source1 source2 source3 ;
   return <source>$(target-os:G=)-$(sources).cpp ;
}

And the one I use in such organizations:

import property ;

rule add-os-specific-sources ( properties * )
{
   local target-os = [ property.select <target-os> : $(properties) ] ;
   local sources = [ glob some/dir/$(target-os:G=)-*.cpp ] ;
   return <source>$(sources) ;
}

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