The attached patches fix http://gcc.gnu.org/PR52822, and have been
tested with `make check-c++` on linux-x86_64. The trunk patch applies
and tests cleanly on gcc-4_7-branch. The gcc-4_6-branch patch is
significantly simpler, as Paolo suggested on the bug.
A few small issues.
For the 4.6 version of the patch, you want to use std::__addressof,
instead of simply &, which may be overloaded.
For the mainline/4.7 version, you want to cast __pred to bool:
!bool(__pred(*__first)). Also, isn't clear to me why you have
__local_len in __find_if_not_n instead of just working on __len (and in
any case please prefer just __local_len as condition instead of the
redundant __local_len != 0; likewise in many other similar situations).
Also, very minor nit, you will be touching the libstdc++-v3 Changelog
thus no libstdc++-v3 prefixes in the ChangeLog entry.