A few portage releases ago, EMERGE_DEFAULT_OPTS was introduced. Being a lazy bum, I jumped on that feature and put "-v" in there (saves thousands of keystrokes over the years). There's a slight (probably harmless) bug in current portage releases that lead to "doubling" flags upon automatic resuming after portage updates.
From what I've seen so far, portage uses exactly the same flags for "auto-resume" that were in use when it started updating itself. However, 'passed ' and 'used' flags are not necessarily the same any more. In my case, I say 'emerge -DNu world', which resolves to 'emerge -DNuv world'. So portage resumes with 'emerge -DNuvv world' and gives me a warning about redundant '--verbose'. I don't think it's any major problem, it's just cosmetical :)
The message is completely harmless. To fix this properly we really need to migrate to python's optparse module, but that's later...
(In reply to comment #1)
> The message is completely harmless. To fix this properly we really need to
> migrate to python's optparse module, but that's later...
Just wanted to let you know :)
I think this is fixed by now
This is fixed in portage-2.1.2.