>>>>> On Sat, 8 Jul 2017, Ciaran McCreesh wrote: > On Sat, 8 Jul 2017 16:39:29 +0200 > Alexis Ballier <aball...@gentoo.org> wrote: >> Indeed, makes sense. Would it also make sense to have some more >> logical meaning in a future EAPI ? I mean, in every context I've ever >> seen, applying a rule to the empty set is the neutral of that rule, >> so that it preserves associativity. >> That'd mean: || ( ) is false, && ( ) is true, ^^ ( ) is false,
I have no strong opinion about this. Is it worth the effort of changing the spec? >> ?? ( ) is false. I think ?? ( ) aka at-most-one-of should be true if empty. > The sensible thing to do is ban it, and additionally ban use? ( ) > inside || and ^^ (if we've not done that already...). Right. We have to check if this will break any eclass generated dependencies, though. Ulrich
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