Re: [jamboost] Re: Python support

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-04-28 07:44:17

On Thursday 28 April 2005 16:10, David Abrahams wrote:
> Vladimir Prus <ghost_at_[hidden]> writes:
> > Ouch! The site-config file initializes stlport, which is a project
> > itself, and so tries to inherit from 'user-config', that's not defined
> > yet!
> >
> > I've modified the logic so that "standlone" project (those that don't
> > correspond to Jamfiles), do not inherit from user-config.
> >
> > Can you try again?
>
> I think one problem is that
>
> # Support for Python and the the Boost.Python library.
> #
> # This module defines
> #
> # - a project 'python' with a target 'python' in it, that corresponds
> # to the python library
> #
>
> Which "python library?" Boost.Python, or Python itself?

The target 'python' correspond to Python itself.

> Can't I get support for Python without bringing in
> Boost.Python-related stuff?

At the moment, no. The python.jam both defines 'python' target -- which is for 
Python itself, and python-extension -- which is for Boost.Python.

> # - a main target rule 'python-extension' which can be used
> # to build a python extension.
> #
> # Extensions that use Boost.Python must explicitly link to it.
>
> rule init ( version ? : root ? : includes ? : libraries ? :
> cygwin-condition ? ) {
>
>
> ...
>
>
> rule python-extension ( name : sources * : requirements * : default-build *
> : usage-requirements * )
> {
>
>
> So why aren't there any comments describing the arguments to init and
> python-extension?

Well, 'python-extension' arguments are exactly the same as for any main 
target. I'll document 'init' right now.

>
> It appears that the includes argument to init is never even used.
> What's up with that?

It's passed to 'init-unix', for example, and then used there:

includes ?= $(root)/include/python$(version) ;
......... 
alias python
: 
:
:
: <include>$(includes) 
<library-path>$(libraries)
<find-shared-library>python$(version)

- Volodya

-- 
Vladimir Prus
http://vladimir_prus.blogspot.com
Boost.Build V2: http://boost.org/boost-build2