Fix rebuild blacklist so that icedtea isn't rebuilt unnecessarily.

parallel_emerge

 #!/usr/bin/python2.6
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Program to run emerge in parallel, for significant speedup.
 
 Usage:
  ./parallel_emerge [--board=BOARD] [--workon=PKGS] [--no-workon-deps]
                    [emerge args] package"
@@ skipping 998 matching lines @@
         for dep in deps_map[pkg]["needs"]:
           t = LastModifiedWithDeps(dep, pkg_db, cache)
           cache[pkg] = max(cache[pkg], t)
         return cache[pkg]
 
       # For every package that's getting updated in our local cache (binary
       # or source), make sure we also update the children. If a package is
       # built from source, all children must also be built from source.
       local_ready_cache, remote_ready_cache = {}, {}
       local_mtime_cache, remote_mtime_cache = {}, {}
-      for pkg in final_pkgs:
+      for pkg in final_pkgs.difference(rebuild_blacklist):
         # If all the necessary local packages are ready, and their
         # modification times are in sync, we don't need to do anything here.
         local_mtime = LastModifiedWithDeps(pkg, local_pkgs, local_mtime_cache)
         local_ready = PrebuiltsReady(pkg, local_pkgs, local_ready_cache)
         if (not local_ready or local_pkgs.get(pkg, 0) < local_mtime and
-            pkg not in cycles and pkg not in rebuild_blacklist):
+            pkg not in cycles):
           # OK, at least one package is missing from the local cache or is
           # outdated. This means we're going to have to install the package
           # and all dependencies.
           #
           # If all the necessary remote packages are ready, and they're at
           # least as new as our local packages, we can install them.
           # Otherwise, we need to build from source.
           remote_mtime = LastModifiedWithDeps(pkg, remote_pkgs,
                                               remote_mtime_cache)
           remote_ready = PrebuiltsReady(pkg, remote_pkgs, remote_ready_cache)
@@ skipping 649 matching lines @@
   # If we already upgraded portage, we don't need to do so again. But we do
   # need to upgrade the rest of the packages. So we'll go ahead and do that.
   if portage_upgrade:
     args = sys.argv[1:] + ["--nomerge=sys-apps/portage"]
     os.execvp(os.path.realpath(sys.argv[0]), args)
 
   print "Done"
 
 if __name__ == "__main__":
   main()