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From: David Abrahams (dave_at_[hidden])
Date: 2006-11-20 12:25:13

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:

> 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

Dave Abrahams
Boost Consulting

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