I have started implementing gdb support for DWARF-5. To prevent possible work duplication if this Bug has been found by anyone.
Ongoing work before it gets submitted: git://sourceware.org/git/archer.git git diff archer/users/jkratoch/dwarf5gcc{,-gdb}
[PATCH 5/8] DWARF-5 basic functionality https://sourceware.org/ml/gdb-patches/2017-02/msg00303.html
Now checked-in (except DWO and .debug_names) as a patch series, primarily: commit 43988095a5a4c53e6d5b00a6335454919c4fac55 Author: Jan Kratochvil <jan.kratochvil@redhat.com> Date: Mon Feb 20 20:53:21 2017 +0100 DWARF-5 basic functionality