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From: David Abrahams (dave_at_[hidden])
Date: 2004-06-09 05:39:35

Vladimir Prus <ghost_at_[hidden]> writes:

> 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 think we could get into trouble with separate "using" statements in
site_config / user_config. Don't forget that site_config may be
installed by some sysadmin somewhere.

Dave Abrahams
Boost Consulting

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