Re: [Boost-build] Alias requirements?

Subject: Re: [Boost-build] Alias requirements?
From: Vladimir Prus (ghost_at_[hidden])
Date: 2010-11-29 03:23:42

On Monday, November 29, 2010 10:53:17 Gevorg Voskanyan wrote:
> I feel I must be missing something obvious, but are alias requirements
> supposed to work? Consider this simple case:
> 
> alias src : a.cpp b.cpp : <define>FOO ;

This says:

        Whenever somebody asks for 'src', take metargets a.cpp and b.cpp, and 
       generate them with <define>FOO, then return result. 

However, given that a.cpp and b.cpp are source files, generating them merely
creates targets, and <define>FOO is not used in any way. 

> exe e : main.cpp src ;
> 
> Here both a.cpp and b.cpp get built without FOO being defined. Changing
> 'alias' with 'lib' fixes the things and causes FOO to be properly defined
> for a.cpp and b.cpp.

Yes, because in that case, <define>FOO applies to the 'lib' target, and 'lib'
target can make some use of it.

Does this clarifies things?

-- 
Vladimir Prus
http://vladimir_prus.blogspot.com
Boost.Build: http://boost.org/boost-build2