This FTBFS problem (on GCC 6) was reported in the discussion on Issue 4814. As this build failure is separate from the crash of Issue 4814, this issue was created for fixing the problem with the build.
Thanks to Guido Aulisi for reporting the problem and providing an initial patch.
Diff:
Because it is quite trivial and is causing problems for our bug squad, pushed right away to staging as
commit b280487b16134aaad7e284a6034f1a4eba3a5a99
Author: Heikki Tauriainen g034737@welho.com
Date: Sat Jul 23 12:48:11 2016 +0300