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On 12/08/15 01:00 PM, Alexis Ballier wrote: |
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> On Wed, 12 Aug 2015 12:57:25 -0400 Ian Stakenvicius |
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> <axs@g.o> wrote: |
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> |
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>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 |
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>> |
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>> On 12/08/15 12:42 PM, Ulrich Mueller wrote: |
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>>> On Wed, 12 Aug 2015, Ian Stakenvicius wrote: |
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>>>> 2 - is there a particular reasoning for the - in front of |
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>>>> qt4 here? I only ask because it would seem that a single |
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>>>> default-enable should suffice in lists like this to |
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>>>> indicate a resolution path, no? That is, '^^ ( +flag1 |
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>>>> -flag2 -flag3 -flag4 )' to me seems like it would be the |
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>>>> same as '^^ ( +flag1 flag2 flag3 flag4 )' |
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>>> |
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>>> If the user has both "qt4 qt5", then enabling qt5 alone |
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>>> won't help to resolve "^^ ( qt5 qt4 )". |
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>>> |
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>> |
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>> Right, but the PM knows based on a particular REQUIRED_USE |
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>> operator what it would need to do when a particular flag is set |
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>> to default. Given '^^' is must-be-one-of, the +flag would be |
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>> enabled and all the other flags would be disabled, right? |
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>> |
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>> Here's how I'd see it mapping out: |
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>> |
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>> || ( +flag1 flag2 ... ) , PM only forces-on flag1 ^^ ( +flag1 |
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>> flag2 ... ) , PM forces-on flag1, forces-off all others ?? ( |
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>> +flag2 flag2 ... ) , PM forces off all but flag1 |
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>> |
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>> I'm not sure if the following make sense though... thoughts? |
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>> |
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>> {,!}flag1? ( +flag2 ) , PM forces-on flag2 {,!}flag1? ( +!flag2 |
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>> ) , PM forces !flag2, meaning forces-off flag2 |
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>> |
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>> |
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>> I'm just wondering if it's really necessary in terms of syntax |
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>> to specify the flag-negation that the PM would need to do. |
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> |
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> |
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> See my other email: neither + nor - are necessary :) |
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> |
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> |
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I'd disagree on that -- technically they aren't necessary, but the |
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whole reason why these new operators were added in the first place |
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was so that it's a lot easier for developers to fill in REQUIRED_USE |
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and get the logic right. Mapping out a ^^ ( flag1 flag2 flag3 flag4 |
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) into all of its permissible flag-a? ( flagb !flagc !flagd ) |
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variants is a royal pain. Plus there's |
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readability/understandability to consider here. |
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