This fixes the longstanding problem with bitfield references. The default dialect was set to cxx1y, which was resulting different conversions for bitfield references. I'm not sure if there's a change in semantics for 1y or if that's a separate bug, but it's not related to concepts.
Also prevent an ICE for invalid constrained friends.
2013-10-16 Andrew Sutton <andrew.n.sut...@gmail.com>
* gcc/c-family/c-common.c (cxx_dialect): Make the default
language C++11.
* gcc/cp/constraint.cc (check_constrained_friend): Don't assert
on error_mark_node.
Andrew
bugfix-2.patch
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