On Sat, 8 Jul 2017 13:49:56 +0200 Alexis Ballier <aball...@gentoo.org> wrote: > On Sat, 8 Jul 2017 12:26:59 +0200 > Ulrich Mueller <u...@gentoo.org> wrote: > > | * An any-of group (||) evaluates to true if at least one of the > > | items in it evaluates to true. > > | * An exactly-one-of group (^^) evaluates to true if exactly one of > > | the items in it evaluates to true, and all the remaining items > > | evaluate to false. > > | * An at-most-one-of group (??) evaluates to true if at most one of > > | the items in it evaluates to true. > > > > It should be added that any empty group (|| or ^^ or ??) evalutates > > to true, because that's what PMS specifies: > > https://projects.gentoo.org/pms/6/pms.html#x1-780008.2 > > A bit OT, but that is *definitely* counter intuitive. What's the > rationale and usecase behind this ?
Annoying special cases like || ( foo? ( ... ) bar? ( ... ) ) . The original reason was that old versions of Portage would simply remove unmet "flag? ( )" blocks internally. It was kept in EAPI 0 because stuff in the tree used it back then. -- Ciaran McCreesh
