Right now, portage would like to upgrade cross-aarch64-unknown-linux-gnu/binutils to version 2.28.1, and the cross binutils have a dependency on sys-libs/binutils-libs. This leads to the following conflict on my system: sys-libs/binutils-libs:0 (sys-libs/binutils-libs-2.28.1:0/2.28.1::gentoo, ebuild scheduled for merge) pulled in by >=sys-libs/binutils-libs-2.28.1 required by (cross-aarch64-unknown-linux-gnu/binutils-2.28.1:2.28.1/2.28.1::bumblebee, ebuild scheduled for merge) ^^ ^^^^^^ (sys-libs/binutils-libs-2.28-r1:0/2.28::gentoo, installed) pulled in by sys-libs/binutils-libs:0/2.28=[abi_x86_32(-),abi_x86_64(-)] required by (x11-libs/cairo-1.14.8:0/0::gentoo, installed) ^^^^^^^^ Note that the bumblebee overlay is where crossdev is copying its ebuilds. Still have to figure out how to workaround that issue.
There is no conflict. You need to update sys-libs/binutils-libs and rebuild its reverse dependencies (e.g. x11-libs/cairo) during one invocation of emerge.
