some package fail to link/compile if they are compile with - gcc-5.1.0 - CFLAGS="-flto -O2 -fipa-pta" xfce-base/xfconf-4.12.0 is one example. "lto1: fatal error: /var/tmp/portage/xfce-base/xfconf-4.12.0/temp/ccDkjV3d.ltrans0.o: section signals.lto_priv.30 is missing compilation terminated." Reproducible: Always
Created attachment 404988 [details] xfconf build.log
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66705
the upstream fix is included in gcc-5.3