[boost] Re: [build] relative vs absolute

From: Yuval Ronen (ronen_yuval_at_[hidden])
Date: 2005-05-22 12:20:24

> > I'd like to ask one more question, if possible.
> > How does it know how to expand $(BOOST_ROOT)?
> > If I'm standing in C:\libraries\boost_1_32_0\libs\python\test, for
example,
> > how can it possibly know that "$(BOOST_ROOT)" is "../../.."? I can't
think
> > of any algorithm that can reliably determine this. What am I missing?
>
> BOOST_ROOT is registered as a "path global" in the top-level Jamrules
> file:
>
>    path-global BOOST_ROOT : . ;
>
> Boost.Build simply adjusts its value appropriately before loading each
> Jamfile.

And how is this Jamrules file found? The only thing I can think of is this:
Wherever (in terms of directory) I'm invoking the build, the algorithm is to
go up the directory tree until a file by the name of "Jamrules" is found,
and then do what it says.
Is this correct?