This compiles and installs with ABI support for both Python 2 and 3. I don't know how to switch this, so currently this downloads both py2 and py3 tarballs regardless of whether they're needed. This also includes a one-line patch to allow rc1 to run on Python 3 (pulled from upstream svn).
Created attachment 230837 [details] ebuild for cherrypy 3.2.0_rc1
Created attachment 230839 [details, diff] one line patch pulled from upstream svn
*** Bug 298968 has been marked as a duplicate of this bug. ***
Fixed.