On Friday 08 July 2011 18:39:04 Stroller did opine thusly: > On 8 July 2011, at 16:19, Alan McKinnon wrote: > > ... > > easy. > > > > Two USE flags: gtk2 and gtk3 > > > > in ebuild: > > > > DEPEND=" > > > > gtk2? (x11-libs/gtk+:2) > > gtk3? (x11-libs/gtk+:3) > > > > " > > > > in src-configure() write the code such that it establishes a > > precedence > > > > If both flags are set, build against gtk+:3 > > If only one flag is set, build against that toolkit > > If no flags are set, do something appropriate. > > This is the way it was done for gtk vs. gtk2, but the bug has been > updated since I first read it (over 24 hours ago) and apparently > the Gnome team don't want the two separate flags in the future. > > I'm not really a gtk or Gnome (or X11) user, so I don't really know, > but the two separate flags did strike me as a bit of an ugly / > clumsy way of doing things.
It's also the only mechanism I know of to do it. If the ebuild will support two toolkits and the choice of which to use is based solely on a user's preference, there is only one way to resolve that - a precedence list. There's no way around that. Some global mechanism would be nice and could be useful in various cases: gtk+-2 vs gtk+-3 openssl vs gnuts mysql vs mariadb Those are also virtuals. -- alan dot mckinnon at gmail dot com
