Certainly one of the strangest thinks I have seen in a while. Running: emerge -f kdelibs (or even something the requires kdelibs, such as kdebase-meta) creates a zero byte file in /var/log/portage (/var/log/portage/kde-base:kdelibs-4.6.3-r2:yyyymmdd-hhmmss.log). I know of no other package that exhibits this behavior (and this did not happen with older versions of kdelibs). Reproducible: Always Expected Results: emerge -f should not create log files for any package
This is fixed in 2.1.10.3 and 2.2.0_alpha41: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=19c9f21ecddc2ed7092e91a57fe219e3082aa18c