Toolset configuration question

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-06-09 01:41:31

I'd like to finally settle the question that Michael raised some time ago. 
Briefly, given

using gcc ;
using gcc : 3.3 : g++-3.3 ;

it is not clear if default-configured gcc is the same as gcc 3.3, or not. This 
might cause a problem for user, since he can build the project twice without 
need, and it causes some complexity for toolsets. 

Here's what I propose: each "configuration parameter" of toolset should be 
either specified on all calls of the "using" rule, or omitted in all the 
calls. The rationale is: first time user can invoke "using gcc ; " and it 
will work. Advanced user, who wants to configure several version, probably 
knows the version number of default "gcc" as well, so it's no problem for 
him.

I plan to introduce auxilliary funciton to call for this rule automatically, 
but that's implementation issue.

Opinions?

- Volodya