On Wed, 2015-08-12 at 00:02 +1000, Michael Palimaka wrote: > 3. Create a whole new solution like USE="gui" (what happens if I have > multiple gui implementation USE flags set?)
This is what I would suggest. It would remove 90% of the problem since most applications use only one gui toolkit. If no toolkit USE flags are set, go with the "best" (most stable, best supported) toolkit. If multiple flags are set - here you have a choice. The user-friendly approach is to add some logic to find the "best" toolkit out of the ones for which a flag is set (this gets complicated in the theoretical case of three toolkits). However, the user-friendly approach is completely unworkable when there are reverse dependencies on your package (plugins for example) that require a specific toolkit. So a better choice might be REQUIRED_USE, *but* then you must adjust package.use in all profiles to allow your package to be emerged without forcing a user to manually set/unset flags.
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