Seems FTBFS since recent gcc update in rawhide.
Quick-n-dirty rawhide scratch build of 5.10.1 release fails similarly (on x86_64, only tested that arch).
chromium fails similarly, bug #1545936
Confirmation that this does seem to be x86_64 specific, i686 scratch build ok, https://koji.fedoraproject.org/koji/taskinfo?taskID=25078846
Yeah, I didn't expect 5.10.1 to be any better. This is also going to block getting 5.10.1 security updates out to F27 and F26 unless I screw the upgrade path and just push the thing. I don't think this will be fixed any time soon, so be prepared for Rawhide composes being broken for at least a couple week.
%changelog * Fri Feb 16 2018 Rex Dieter <rdieter> - 5.10.0-6 - workaround FTBFS, build with -fabi-version=11 (#1545918) this worked.