^^ has the pleasant side effect of being easier to read, as a user. The user receives a message saying "at-most-one-of" instead of some convoluted other expression that they don't understand.
I am all for the use of ^^ add the default for this reason. Additionally, ?? has the same effect of being easy to understand as the description in the error message is in plain English. -- NP-Hardass On August 2, 2015 12:34:51 PM EDT, Ben de Groot <yng...@gentoo.org> wrote: >Recently some team members of the Qt project have adopted these ebuild >policies: https://wiki.gentoo.org/wiki/Project:Qt/Policies > >I have an issue with the policy adopted under "Requires one of two Qt >versions". In my opinion, in the case where a package offers a choice >between qt4 or qt5, we should express this in explicit useflags and a >REQUIRED_USE="^^ ( qt4 qt5 )". This offers the user the clearest >choice. > >Other developers state that users are not interested in such >implementation >details, or that forced choice through REQUIRED_USE is too much of a >hassle. This results in current ebuilds such as quassel to not make it >clear that qt4 is an option. > >This goes against the principle of least surprise, as well as against >QA >recommendations. I would like to hear specifically from QA about how we >should proceed, but comments from the wider developer community are >also >welcome. > >-- >Cheers, > >Ben | yngwin >Gentoo developer -- NP-Hardass
