Re: [Boost-build] Default action is "install" ??

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2006-11-20 15:19:05

David Abrahams wrote:
> Vladimir Prus <ghost_at_[hidden]> writes:
> 
>>> That splits current "<build>yes" into what we actually have of implicit
>>> vs. explicit building. This way we can do the more convenient of setting
>>> "<build>explicit" at the project level, and then be able to select
>>> specific targets to <build>implicit.
>> I'm afraid this won't place nice with target alternatives:
>                         ^^^^^
>                         "play"
> 
>> 	obj foo : foo_msvc.c : <toolset>msvc ;
>>         obj foo : foo_gcc.c : <toolset>gcc ;
>>         explicit foo ;
>>
>> To make 'explicit' a value of a 'build' property, you'd have to duplicate it.
> 
> Surely when declaring target alternatives, the likelihood that
> something must be duplicated (e.g. "obj foo" :) ) is quite high?  I
> don't see why "explicit" deserves special treatment to avoid
> duplication and I like Rene's suggestion.
> 
> Actually, I would prefer to see something like:
> 
>   obj foo 
>      : [ alternative foo_msvc.c : <toolset>msvc ]
>        [ alternative foo_gcc.c : <toolset>gcc ]
>      : explicit  # common requirements here
>   ;
> 
> which further improve declarativeness as well as removing more
> duplication.

Good point about doing it in one target declaration. As it happens 
that's currently possible as with the extra <build>explicit:

obj foo
   : ## not sure if obj targets can have no sources here.
   : <toolset>msvc:<source>foo_msvc.c
     <toolset>gcc:<source>foo_gcc.c
     <build>explicit ;

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