Re: Free feature problem

From: David Abrahams (dave_at_[hidden])
Date: 2004-07-02 08:11:27

Vladimir Prus <ghost_at_[hidden]> writes:

> pal.tw wrote:
>
>> According to the description of module 'alias' ...
>>
>> --------------------------------------------------------
>> alias platform-src : win.cpp : <os>NT ;
>> alias platform-src : linux.cpp : <os>LINUX ;
>> exe main : main.cpp platform-src ;
>> --------------------------------------------------------
>>
>> The scripts will fail in BBv2. Because in NT, <os>LINUX is not
>> defined.
>> Conversely, <os>NT is not defined in lunux.
>
> Heck, I've just made <os>NT work in condition but forgot that it can be placed 
> inside requirements as well :-(
>
> Folks, how do you feel about some rule like:
>
> use-property ( property )
>
> which would be used like:
>
> use-property <os>NT ;
>
> and will make NT a valid value of the <os> feature. If <os>NT is defined 
> already, the above will be no-op? 
>
> This is something we planned for some time... maybe we should add it now?
>
> Thoughts?

Seems as though it ought to be unneccessary, doesn't it?

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com