Re: [jamboost] Re: boost.build-v2: usage-requirements for header-only libs?

From: Vladimir Prus (ghost_at_[hidden])
Date: 2003-08-27 02:57:38

David Abrahams wrote:
> "peter_schoen1_web_de" <Peter.Schoen1_at_[hidden]> writes:
>
> G> Hi,
>
> > the boost.build-v2 manual explains how to define prebuilt targets and
> > the usage-requirements for these targets.
> >
> > I have several header-only libs (like many boost libraries), and I
> > wonder how can I define the usage-requirements for such a lib?
> >
> > This doesn't work:
> >
> >
> > lib aHeaderOnlyLib
> >
> > : <include>include
> >
> > ;
> >
> > Very best wishes
>
> Yep, I'm having the same problem. I want to use some header-only
> libraries from boost. I'd have thought adding <uses>/boost to my
> requirements would do it, since the boost Jamfile.v2 says that the
> usage-requirements are "<include>."

In fact, immediately after I went online after replying Peter, I realized we 
can support this in a simple way in V2.

alias aHeaderOnlyLib : : : : <include>include ;

Now, alias does not support usage requirements, but it's trivial to add. Any 
objections to this approach?

W.r.t. projects: the 'usage-requirements' attribute on projects have effect 
only on targets declarated in that project, so <use>/boost does not work.

- Volodya