Re: [Boost-build] Liking to pthreads

From: David Abrahams (dave_at_[hidden])
Date: 2006-09-19 04:14:51

Vladimir Prus <ghost_at_[hidden]> writes:

> On Tuesday 19 September 2006 00:09, David Abrahams wrote:
>
>> >> Why not that, too?
>> >
>> > Because I did not see obvious use case for that. And <threading>multi is
>> > non-free so it can be passed via usage requirements anyway at the moment.
>>
>> ??  If it is non-free and can be passed via usage requirements, this
>> exact capability would be useful.
>
> Sorry, "can" should be "can't". Non-free features can't be passed via usage 
> requirements.

Why not?  

>> >> And what's a "parent?" do you mean a project higher up in the hierarchy?
>> >
>> > For a target -- project where the target is defined. For a project --
>> > project higher up.
>>
>> I can see why it's slightly less dangerous to limit the feature in
>> that way, but I'm not sure it's worth the cost.  We've long discussed
>> the desire to say "despite usage requirements, I know better; this
>> target doesn't have such-and-such requirement."
>
> I just don't remember such discussions. If you can point me on them, 

No time to dig, sorry.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com