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From: David Abrahams (dave_at_[hidden])
Date: 2003-03-07 08:43:44

Vladimir Prus <ghost_at_[hidden]> writes:

> The first target will be build with default value <rtti>on. What about the
> second:
> 1. Should we request it with <rtti>on and get an error, or
> 2. Should we request if without any <rtti> setting and allow it to be
> built with <rtti>off
> I think (1) is way safer. But interested in other opinions.

I agree with you that it's safer. I was going to say that the only
other potentially viable option is:

3. The <rtti>off is propagated back towards the first target by the
second, much like a use-requirement.

However, as I consider it, I think there's a real use-case for "I
know what I'm doing; I want <rtti>on on the first target, and I just
won't do anything evil with the library which causes me to need
<rtti>on with it."

In general cases like that should warn, with the ability to disable
the warning somehow.

Dave Abrahams
Boost Consulting

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