Fabian Groffen wrote:
> On 04-04-2009 13:23:24 +0300, Petteri Räty wrote:
>>> However, we have toyed with other ideas. One of which is to introduce
>>> IUSE=prefix in prefix.eclass similar to the USE=multilib approach. I
>>> don't really like this idea because it exposes the use flag and we
>>> don't want it exposed to the users.
>>>
>> If you don't want it exposed to users, then use a USE_EXPAND variable.
>> Like zmedico said in EAPI 3 a normal use flag could be hidden but
>> probably better to not have to migrate everything with prefix support to
>> EAPI 3. Out of the existing USE_EXPAND variables USERLAND makes most
>> sense to me but we could also introduce a new one too.
> 
> USE_EXPAND does something like:
> USERLAND="GNU" -> userland_GNU
> 
> For Prefix, we just need the "prefix" USE-flag (not prefix_XXX), hence
> USE_EXPAND doesn't help us.  Adding "prefix" to use.mask (and use.force
> in Prefix profiles) allows us to get the desired behaviour.
> 
> 

If prefix is in USERLAND then you have a userland_prefix use flag to use
that can be hidden.

Regards,
Petteri