cannot build kde-base/kdelibs-4.2.4-r3 log and emerge --info in attachment Reproducible: Always
Created attachment 197036 [details] log of crashed build process
Created attachment 197038 [details] emerge --info
I may be mistaken, but try removing those (unsafe?) SSE-related compiler flags.
Bug seems to be multilib-overlay related. I had some qt-libs from this overlay installed. Now, after i went back to vanilla gentoo, i can build the kdelibs.
*** Bug 279742 has been marked as a duplicate of this bug. ***