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Yeah the "soft" thing was meant as "do this unless something breaks, then |
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do it otherwise" |
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On Wed, Feb 10, 2016 at 8:57 PM, Kent Fredric <kentfredric@×××××.com> wrote: |
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> On 11 February 2016 at 15:51, Rich Freeman <rich0@g.o> wrote: |
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> > In this case you just wouldn't enable python 2.7 support, but you |
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> > wouldn't disable it either. Portage would just pull it in where it is |
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> > needed. |
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> |
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> |
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> But you still need a mechanism in place if you *dont* want that to happen. |
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> |
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> I might choose to forbid python2.7 support, and portage really |
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> shouldn't "auto enable" python 2.7 support if I've explicitly |
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> indicated I don't want python 2.7 support. |
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> |
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> Unless of course you're suggesting "USE=-python_targets_python2_7" |
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> would not be "auto-enableable" |
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> |
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> But then you're *still* requiring a tri-state USE. |
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> |
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> USE="-foo" + IUSE="+foo" => "-foo" => autouse enables foo if required |
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> USE="" + IUSE="+foo" => "foo" => standard EFFECTIVE_USE="foo" |
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> USE="foo" + IUSE = "+foo" => "foo" => standard EFFECTIVE_USE="foo" |
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> USE="-foo" + IUSE="foo" => "-foo" => autouse enables foo if required |
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> USE="" + IUSE="foo" => "-foo" => autouse enables foo if required |
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> USE="foo" + IUSE="foo" => "foo" => standard EFFECTIVE_USE="foo" |
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> |
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> |
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> So the logic composing USE + IUSE has to change in generating the |
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> effective USE set so that USE + IUSE can emit a 3rd and 4th state. |
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> |
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> USE="-foo" + IUSE="+foo" => "-foo!!" => autouse fails if foo is required |
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> USE="" + IUSE="+foo" => "foo" => standard |
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> EFFECTIVE_USE="foo", auto-unuses foo if blocked by a dep |
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> USE="foo" + IUSE = "+foo" => "foo!!" => standard EFFECTIVE_USE="foo", |
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> fails if foo is "blocked" by a dep |
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> USE="-foo" + IUSE="foo" => "-foo!!" => autouse fails if foo is required |
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> USE="" + IUSE="foo" => "-foo" => autouse enables foo if required |
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> USE="foo" + IUSE="foo" => "foo!!" => standard EFFECTIVE_USE="foo", |
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> fails if "foo" is blocked by a dep. |
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> |
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> |
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> Mentally keeping track of this accounting magic would be complicating |
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> matters. |
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> |
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> -- |
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> Kent |
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> |
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> KENTNL - https://metacpan.org/author/KENTNL |
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> |
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> |
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