Re: [gentoo-dev] GLEP 29 (USE Flag Grouping) with -@GROUP goodness

[Ciaran McCreesh]

On Thu, 28 Oct 2004 18:04:41 -0400 Lina Pezzella <j4rg0n@g.o>
wrote:
| I'm all in favor of this provided that the exact USE flags that each 
| grouping specifies are clearly detailed in easily accessible 
| documentation.

Yeah, there's a note on hopefully getting a groups list like the current
global use list on the site.

| Perhaps for those of you who care to be kinder to less 
| knowledgeable users, a line such as "if USE flags are specified twice,
| the latest specification will be used. If USE flags are specified more
| than once..." Two sentences is all that's really necessary.

That should already be specified somewhere, it's the way things are
right now. USE="foo bar foo -foo" -> "bar -foo".

| Perhaps I'm rusty on my set theory, but what would happen in the 
| following [rather ludicrous] case: USE="@GNOME @KDE -X"? Will it be -X
| for all cases that don't expressly depend upon it, or is it additive, 
| and the two instances of +X in @GNOME and @KDE will override the one 
| instance of -X?

You don't need set theory for that. The set theory stuff only comes in
if we start messing with that $stuff that Maurice was suggesting. With
the simple currently proposed method, you'll end up with -X, since flags
furthest to the right have highest priority.

Same as if you do USE="foo foo foo foo foo -foo", it ends up as -foo.

-- 
Ciaran McCreesh : Gentoo Developer (Vim, Fluxbox, Sparc, Mips)
Mail            : ciaranm at gentoo.org
Web             : http://dev.gentoo.org/~ciaranm