Yeah the "soft" thing was meant as "do this unless something breaks, then do it otherwise"
On Wed, Feb 10, 2016 at 8:57 PM, Kent Fredric <kentfred...@gmail.com> wrote: > On 11 February 2016 at 15:51, Rich Freeman <ri...@gentoo.org> wrote: > > In this case you just wouldn't enable python 2.7 support, but you > > wouldn't disable it either. Portage would just pull it in where it is > > needed. > > > But you still need a mechanism in place if you *dont* want that to happen. > > I might choose to forbid python2.7 support, and portage really > shouldn't "auto enable" python 2.7 support if I've explicitly > indicated I don't want python 2.7 support. > > Unless of course you're suggesting "USE=-python_targets_python2_7" > would not be "auto-enableable" > > But then you're *still* requiring a tri-state USE. > > USE="-foo" + IUSE="+foo" => "-foo" => autouse enables foo if required > USE="" + IUSE="+foo" => "foo" => standard EFFECTIVE_USE="foo" > USE="foo" + IUSE = "+foo" => "foo" => standard EFFECTIVE_USE="foo" > USE="-foo" + IUSE="foo" => "-foo" => autouse enables foo if required > USE="" + IUSE="foo" => "-foo" => autouse enables foo if required > USE="foo" + IUSE="foo" => "foo" => standard EFFECTIVE_USE="foo" > > > So the logic composing USE + IUSE has to change in generating the > effective USE set so that USE + IUSE can emit a 3rd and 4th state. > > USE="-foo" + IUSE="+foo" => "-foo!!" => autouse fails if foo is required > USE="" + IUSE="+foo" => "foo" => standard > EFFECTIVE_USE="foo", auto-unuses foo if blocked by a dep > USE="foo" + IUSE = "+foo" => "foo!!" => standard EFFECTIVE_USE="foo", > fails if foo is "blocked" by a dep > USE="-foo" + IUSE="foo" => "-foo!!" => autouse fails if foo is required > USE="" + IUSE="foo" => "-foo" => autouse enables foo if required > USE="foo" + IUSE="foo" => "foo!!" => standard EFFECTIVE_USE="foo", > fails if "foo" is blocked by a dep. > > > Mentally keeping track of this accounting magic would be complicating > matters. > > -- > Kent > > KENTNL - https://metacpan.org/author/KENTNL > >
