So far the only package which caused me problems is dev-qt/qtnetwork:5 with USE=ssl, building or trying to upgrade anything depending on qtnetwork after the update of openssl fails until qtnetwork is rebuilt. There may be other packages in this situation but so far this is the only one I identified. I noticed that it causes rebuilds for a lot of other packages but somehow this got lost. NOTE: I really appreciate what you guys are doing, keep up the good work you're doing with gentoo, I enjoy it a lot.
*** This bug has been marked as a duplicate of bug 576128 ***