On Wed, 20 Jun 2012 18:57:19 +0200
hasufell <hasufell@gentoo.org> wrote:

> >> 2. Afais useflags that are already in IUSE and used for build-time
> >> stuff must not be used for IUSE_RUNTIME too.
> >> This is a random rule IMO. I don't have many cases in mind where
> >> this would be annoying (could think of "debug" enabling some
> >> in-source switches and adding optional debug tools in RDEPEND.
> >> Having one flag here would make it cleaner and tighter for the
> >> user to interact with useflags.).
> >> However... this is not a logical rule, rather a technical issue. If
> >> there is a way to avoid this restriction that would be nice.
> > 
> > I do not see where you are going with this. If it makes sense to
> > turn on the build-time support for a feature without installing all
> > the dependencies then the extra dependencies should go behind a
> > separate USE flag (and that separate USE flag may depend on the USE
> > flag controlling the build-time support using REQUIRED_USE). Or
> > perhaps the additional dependencies should be in some new kind of
> > "suggested" depend.
> 
> I think it is bad to overuse REQUIRED_USE in that way. REQUIRED_USE
> blocks the emerge process and should only be used when there is a
> technical (not logical) useflag correlation.
> 
> Using a seperate USE flag just because the name is blocked means the
> user has to look up another useflag and think about what it is for.
> 
> But as I said... that is rather minor. I just don't like it either,
> cause I feel it might annoy me in the future.
> 
> What do you think about useflag expansion and seperating them in
> make.conf like yngwin suggested:
> 
> USE_RUNTIME="debug" -> will enable "runtime_debug" useflag for all
> ebuilds USE="debug" -> will enable "debug" useflag for all ebuilds
> 
> This would also solve point #1 somehow, cause you don't have to fear
> that your dependency graph will grow just because you didn't examine
> all newly introduced IUSE_RUNTIME flags.
> 
> For people who want that stuff unconditionally they could do:
> USE_RUNTIME="$USE"
> 
> and never bother again with it.

Please read the rationale. Again. The whole thing. Three times.

-- 
Best regards,
Michał Górny