Rebuild when build-time/run-time deps are upgraded.

pym/_emerge/create_depgraph_params.py

 # Copyright 1999-2011 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
 import logging
 from portage.util import writemsg_level
 
 def create_depgraph_params(myopts, myaction):
         #configure emerge engine parameters
         #
         # self:      include _this_ package regardless of if it is merged.
@@ skipping 15 matching lines @@
         if "--update" in myopts or \
                 "--newuse" in myopts or \
                 "--reinstall" in myopts or \
                 "--noreplace" in myopts or \
                 myopts.get("--selective", "n") != "n":
                 myparams["selective"] = True
 
         deep = myopts.get("--deep")
         if deep is not None and deep != 0:
                 myparams["deep"] = deep
-        if "--complete-graph" in myopts:
+        if "--complete-graph" in myopts or "--rebuild" in myopts:
                 myparams["complete"] = True
         if "--emptytree" in myopts:
                 myparams["empty"] = True
                 myparams["deep"] = True
                 myparams.pop("selective", None)
 
         if "--nodeps" in myopts:
                 myparams.pop("recurse", None)
                 myparams.pop("deep", None)
                 myparams.pop("complete", None)
@@ skipping 11 matching lines @@
                 # behavior that may have been implied by some
                 # other option like --update.
                 myparams.pop("selective", None)
 
         if '--debug' in myopts:
                 writemsg_level('\n\nmyparams %s\n\n' % myparams,
                         noiselevel=-1, level=logging.DEBUG)
 
         return myparams