From: Ciaran McCreesh <ciaran.mccreesh@googlemail.com>
To: gentoo-dev@lists.gentoo.org
Subject: Re: [gentoo-dev] [RFC] Forced/automatic USE flag constraints (codename: ENFORCED_USE)
Date: Mon, 29 May 2017 23:05:46 +0100 [thread overview]
Message-ID: <20170529230546.53b793fe@snowblower> (raw)
In-Reply-To: <22828.39468.127754.336255@a1i15.kph.uni-mainz.de>
On Tue, 30 May 2017 00:01:16 +0200
Ulrich Mueller <ulm@gentoo.org> wrote:
> >>>>> On Mon, 29 May 2017, Michał Górny wrote:
> > On pon, 2017-05-29 at 20:00 +0200, Alexis Ballier wrote:
> >> Can you provide an efficient algorithm for the above syntax? That
> >> is, given a set of +/- useflags forced by user, output the set of
> >> effective useflags (or a rant if it is inconsistent).
>
> > I'd rather leave that to people who are good with algorithms. I find
> > the whole thing scary but I don't really see a sane alternative
> > here. Worst case, we have to figure out some arbitrary limitations
> > to keep things sane.
>
> IMHO the sanest alternative would be to restrict the syntax to USE
> conditional forms which have an obvious solution. One of the many
> problems of REQUIRED_USE is that it sometimes requires solving a
> Zebra Puzzle.
Solving zebra puzzles isn't really that bad in practice most of the
time. The tricky bit is finding the *right* solution, given poor input
data that doesn't really let you evaluate what right is. As a simple
example, in the olden days, the most obvious and shortest answer to
fixing Gnome resolution errors was to set USE=mips because that
disabled a whole load of browser dependencies...
--
Ciaran McCreesh
next prev parent reply other threads:[~2017-05-29 22:06 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-29 15:33 [gentoo-dev] [RFC] Forced/automatic USE flag constraints (codename: ENFORCED_USE) Michał Górny
2017-05-29 16:30 ` Kent Fredric
2017-05-29 16:44 ` Michał Górny
2017-05-29 18:00 ` Alexis Ballier
2017-05-29 21:23 ` Michał Górny
2017-05-29 21:31 ` Ciaran McCreesh
2017-05-29 22:01 ` Ulrich Mueller
2017-05-29 22:05 ` Ciaran McCreesh [this message]
2017-05-30 7:47 ` Alexis Ballier
2017-05-30 8:05 ` Ulrich Mueller
2017-05-30 8:10 ` Alexis Ballier
2017-05-30 7:42 ` Alexis Ballier
2017-05-30 8:22 ` Ciaran McCreesh
2017-05-30 8:46 ` Alexis Ballier
2017-05-30 8:56 ` Ciaran McCreesh
2017-05-30 9:25 ` Alexis Ballier
2017-05-30 12:00 ` Ulrich Mueller
2017-05-30 14:33 ` Michał Górny
2017-05-30 15:33 ` Alexis Ballier
2017-05-30 18:11 ` Michał Górny
2017-05-30 18:46 ` Alexis Ballier
2017-05-31 6:55 ` Michał Górny
2017-05-31 7:24 ` Ciaran McCreesh
2017-05-31 7:34 ` Alexis Ballier
2017-05-31 7:35 ` Michał Górny
2017-05-31 7:51 ` Ciaran McCreesh
2017-05-31 7:54 ` Alexis Ballier
2017-05-31 7:56 ` Alexis Ballier
2017-05-31 7:32 ` Alexis Ballier
2017-05-31 8:03 ` Michał Górny
2017-05-31 8:38 ` Alexis Ballier
2017-05-31 13:04 ` Michał Górny
2017-05-31 17:39 ` Alexis Ballier
2017-05-31 19:02 ` Michał Górny
2017-05-31 22:52 ` Ciaran McCreesh
2017-06-01 8:55 ` Alexis Ballier
2017-06-01 21:31 ` Michał Górny
2017-06-02 6:37 ` Michał Górny
2017-06-02 11:18 ` Alexis Ballier
2017-06-02 13:49 ` Michał Górny
2017-06-02 11:27 ` Alexis Ballier
2017-06-02 13:55 ` Michał Górny
2017-06-02 15:09 ` [gentoo-dev] " Martin Vaeth
2017-06-03 11:00 ` [gentoo-dev] " Alexis Ballier
2017-06-03 15:33 ` Michał Górny
2017-06-03 16:58 ` Alexis Ballier
2017-06-04 8:59 ` Alexis Ballier
2017-06-05 7:55 ` Alexis Ballier
2017-06-05 14:10 ` Michał Górny
2017-06-05 17:24 ` Alexis Ballier
2017-06-05 18:10 ` Michał Górny
2017-06-05 18:15 ` Ciaran McCreesh
2017-06-06 12:08 ` Alexis Ballier
2017-06-06 17:39 ` Michał Górny
2017-06-07 6:49 ` Michał Górny
2017-06-07 8:17 ` Alexis Ballier
2017-06-07 9:27 ` Michał Górny
2017-06-07 9:56 ` Alexis Ballier
2017-06-09 9:19 ` Michał Górny
2017-06-09 11:41 ` Alexis Ballier
2017-06-09 12:54 ` Michał Górny
2017-06-09 14:16 ` Alexis Ballier
2017-06-09 16:21 ` Michał Górny
2017-06-11 16:05 ` Alexis Ballier
2017-06-12 9:08 ` Alexis Ballier
2017-06-12 19:17 ` Michał Górny
2017-06-13 10:27 ` Alexis Ballier
2017-06-13 22:13 ` Michał Górny
2017-06-14 9:06 ` Alexis Ballier
2017-06-14 12:24 ` Michał Górny
2017-06-14 13:16 ` Alexis Ballier
2017-06-14 13:57 ` Michał Górny
2017-06-14 14:09 ` Alexis Ballier
2017-06-15 15:59 ` Michał Górny
2017-06-15 16:07 ` Alexis Ballier
2017-06-15 16:13 ` Ciaran McCreesh
2017-06-15 16:19 ` Alexis Ballier
2017-06-15 16:22 ` Ciaran McCreesh
2017-06-15 16:30 ` Alexis Ballier
2017-06-15 16:32 ` Ciaran McCreesh
2017-06-15 16:37 ` Alexis Ballier
2017-06-15 16:45 ` Ciaran McCreesh
2017-06-15 16:55 ` Alexis Ballier
2017-06-15 17:04 ` Ciaran McCreesh
2017-06-15 17:30 ` Alexis Ballier
2017-06-15 17:48 ` Ciaran McCreesh
2017-06-15 18:09 ` Alexis Ballier
2017-06-15 17:38 ` Michał Górny
2017-06-15 18:05 ` Alexis Ballier
2017-06-14 14:28 ` Alexis Ballier
2017-06-02 12:16 ` Alexis Ballier
2017-06-02 13:57 ` Michał Górny
2017-06-02 14:56 ` [gentoo-dev] " Martin Vaeth
2017-06-02 15:19 ` Ciaran McCreesh
2017-06-02 16:26 ` Martin Vaeth
2017-06-02 18:31 ` Martin Vaeth
2017-06-02 1:17 ` [gentoo-dev] " A. Wilcox
2017-06-02 1:28 ` Rich Freeman
2017-06-02 1:33 ` A. Wilcox
2017-06-02 5:08 ` Michał Górny
2017-05-31 12:38 ` [gentoo-dev] " Duncan
2017-05-30 21:13 ` [gentoo-dev] " Kent Fredric
2017-05-30 8:29 ` Michał Górny
2017-05-30 9:34 ` Alexis Ballier
2017-05-30 14:12 ` Michał Górny
2017-05-29 19:24 ` Ciaran McCreesh
2017-05-29 19:42 ` Michał Górny
2017-05-29 19:44 ` Ciaran McCreesh
2017-06-05 8:26 ` Alexis Ballier
2017-06-09 12:35 ` Jason A. Donenfeld
2017-06-09 12:42 ` Michał Górny
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