On Sun, 2 Aug 2015 19:27:02 +0200 Michał Górny wrote: > Long story short, this is USE=gtk once again. GNOME team had a > policy that handled the case cleanly and QA outvoted it in favor of > Qt-like policy. Then Qt team figured out their policy was unfriendly, > and 'fixed' it with this ugly hack... > > As I see it, this is a major failure of using toolkit-version oriented > flags rather than feature-oriented flags. Possibilities compared: > > USE='qt4 qt5' without ^^ is easy to set since it is free of REQUIRED_USE > issues. However, it's ugly: USE='qt4 qt5' may now mean either both > toolkits or one of them. In the latter case, we have two flag > combinations (= two different binary packages) that mean the same. > Additionally, USE='-qt4 -qt5' may mean both none of them or one of > them. If the latter, yet another case of redundant binary package. > > USE='qt4 qt5' with ^^/?? is cleaner from user perspective and better > for binary packages. However, it may mean that user will have to > randomly adjust flags per-package. Which may end up sucking even more > with new Qt versions being introduced and package.use being full of > random '-qt4' and stuff. > > What would be really clean is USE='qt qt5' (or 'qt qt4'), alike GNOME > team policy. USE=qt would mean 'any version of Qt, if optional', and > qt4/qt5 would be used to switch between Qt4/Qt5. If Qt would be > obligatory, no USE=qt would apply. If only one Qt version would be > supported, no USE=qt4/qt5 would apply. Clean, sane and limited > package.use cruft.
This is a clean solution for developers and maintainers, but not for ordinary users — they will confused by "qt qt4 qt5": "what is 'qt', how is it different from 'qt4' and 'qt5'. What you are really doing is implementing second-level USE flags, while they were supposed to be linear. > However, as you can see QA has previously outvoted the clean policy for > USE=gtk. I don't see why it would decide otherwise for USE=qt*. > > -- > Best regards, > Michał Górny Best regards, Andrew Savchenko
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