Re: [Boost-build] multiple levels not allowed in project hierarchy names?

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-04-08 13:30:47

On Tuesday 08 April 2008 07:58:27 Greg Landrum wrote:
> Thanks for the response Volodya.
> 
> I've got a short follow-up question below just to make sure I understand.
> 
> On Mon, Apr 7, 2008 at 9:26 AM, Vladimir Prus <ghost_at_[hidden]> wrote:
> >
> >  What you observe is a known limitation. When you build from root, the
> >  targets in a/Jamfile are built, including this:
> >
> >         alias children : a1 a2 ;
> >
> >  This cause a/a1/Jamfile to be read, and it defines the /BoostBuildSample/a/a1
> >  project id. So, when we get to build a2, that project id is known, and things work.
> >
> >  However, when you build in /BoostBuildSample/a/a2, the 'alias children' is not
> >  build, and nothing causes a/a1/Jamfile to be read.
> >
> >  You can workaround this by adding:
> >
> >         use-project BoostBuildSample/a/a1 : a1 ;
> >
> >  to a/Jamfile
> 
> Ok, this works. It looks like I also need to include :
>   use-project BoostBuildSample/a : a ;
>   use-project BoostBuildSample/b : b ;
> in my Jamroot to be able to reference the a/ subprojects from the b
> directories and vice versa.

Yes, for about the same reason.

> The revised tarball is here:
> http://www.rdkit.org/BoostBuildSample.tgz
> 
> >  There is an issue in the tracker to make project IDs more flexible.
> 
> In the meantime, is there a suggested pattern for handling this, or
> does the approach I'm using (a hierarchy with all the use-project's)
> seem reasonable?

I think adding use-project directives for all project ids is not 100%
nice, but is workable solution.

Note, however, that project ids become important if there's many references
to a project. If there's a helper library used by a couple of exes, you can
just refer to the library target using relative path:

        <relative-path-to-Jamfile>//libtarget

- Volodya

> 
> Thanks,
> -greg
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