[Boost-build] Environment variable usage requirements?

From: David Abrahams (dave_at_[hidden])
Date: 2007-04-18 05:09:39

Consider:

  use-project boost 
    : ../../.. ;
  project my-project
    : requirements <library>/boost/python//boost_python ;

  # Declare a python extension
  python-extension ext : ext.cpp ;

  # Declare a python embedding application that expects to load ext
  exe embed : embed.cpp ext /python//python ;

  # test that application
  run embed ;

The above doesn't work because in order to run embed, one needs the
PYTHONPATH environment variable set so that it includes the directory
into which the "ext" target is generated.  

It would be nice to be able to do things like that without intruding
into the handlers for EXE targets and the "run" testing rule.  Today,
AFAIK, there's no way to communicate the need to set environment
variables (or run commands) when an executable uses a library or
python extension.

Thoughts?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com
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