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Date: Wed, 31 May 2017 09:54:56 +0200
From: Alexis Ballier <aballier@gentoo.org>
To: gentoo-dev@lists.gentoo.org
Subject: Re: [gentoo-dev] [RFC] Forced/automatic USE flag constraints
 (codename: ENFORCED_USE)
Message-ID: <20170531095456.19ea94e9@gentoo.org>
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On Wed, 31 May 2017 08:51:33 +0100
Ciaran McCreesh <ciaran.mccreesh@googlemail.com> wrote:

> On Wed, 31 May 2017 09:35:04 +0200
> Micha=C5=82 G=C3=B3rny <mgorny@gentoo.org> wrote:
> > On =C5=9Bro, 2017-05-31 at 08:24 +0100, Ciaran McCreesh wrote: =20
> > > On Wed, 31 May 2017 08:55:17 +0200
> > > Micha=C5=82 G=C3=B3rny <mgorny@gentoo.org> wrote:   =20
> > > > For example:
> > > >=20
> > > >   foo? ( bar )
> > > >=20
> > > > would mean 'if you have USE=3Dfoo, then USE=3Dbar is enabled as
> > > > well'.   =20
> > >=20
> > > What about "if bar cannot be enabled, then turn foo off"? =20
> >=20
> > Not expressible. The best you can do is 'if bar is disabled, ...' =20
>=20
> This is the kind of thing that gets very messy when a user wants ssl
> enabled, and has to enable either openssl or libressl, and they're on
> a profile where openssl is masked but the ebuild writer prefers that
> option...
>=20

ssl? ( ^^ ( openssl libressl ) ) with openssl masked will be reduced to
'ssl? ( libressl )' so all good here.