[Boost-build] [bbv2] RFC: Repeated usage requirements.

From: Rene Rivera (grafik.list_at_[hidden])
Date: 2006-03-25 15:44:56

I'm porting over my build system from BBv1 to BBv2, and to be nice, I'm 
trying to not hack things up too much. One of the patterns I'm seeing is 
that in writing library targets I end up duplicating many of the 
requirements into the usage-requirements.

* That seems like a waste of typing resources :-)

* It's prone to errors when I need to change one of them and forget to 
change the other.

If it's not already possible to remove that duplication my suggestion 
would be to:

1. Allow both kinds of requirements in the requirements section.

2. To tag requirements that are both regular requirements and 
usage-requirements with <*>.

For example:

lib foo
   :
   funky.cpp
   :
   <define>COOL=1
   <*><define>ENABLE_LOG=1
   <threading>multi:<*><define>THREAD_SAFE=1
   <link>shared:<define>BUILD_DLL=1
   :
   debug
   :
   <link>shared:<define>USE_DLL=1
   ;

Thoughts?

--
-- Grafik - Don't Assume Anything
-- Redshift Software, Inc. - http://redshift-software.com
-- rrivera/acm.org - grafik/redshift-software.com
-- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo