Pull in r229281 from upstream libc++ (by Larisse Voufo):

Implement C++14's sized deallocation functions, since there are no
longer implicitly defined by clang, as of r229241.

This allows ports which use C++14's sized deallocation functions, such
as cad/openvsp, to build on stable/10. Bump __FreeBSD_version to allow
detection from ports.

Direct commit, since stable/11 and head already have newer versions of
libc++ which include this change.

PR: 219484

Synchronize the default C++ stack in stable/10 with head, by merging
almost all recent changes to libc++ and libcxxrt.

MFC r256642:
Since C++ typeinfo objects are currently not guaranteed to be merged at
runtime by the dynamic linker, check for their equality in libcxxrt by
not only comparing the typeinfo's name pointers, but also comparing the
full names, if necessary. (This is similar to what GNU libstdc++ does
in its default configuration.) The 'deep' check can be turned off again
by defining LIBCXXRT_MERGED_TYPEINFO, and recompiling libcxxrt.

Reviewed by: theraven

MFC r270522 (by rdivacky):
The standard we compile libc++ with is called c++11 not c++0x.

MFC r273066 (by bapt):
Import patch from libc++ r197313 which allows using libc++ headers with gcc

Differential Revision: https://reviews.freebsd.org/D942
Reviewed by: imp

MFC r273381 (by bapt):
Add support for __cxa_throw_bad_array_new_length in libcxxrt

It is required for use with newer g++49

Differential Revision: https://reviews.freebsd.org/D982
Reviewed by: theraven
Approved by: theraven

MFC r273382 (by bapt):
Fix build by marking the new functions as weak
This is a temporary fix

MFC r273407 (by bapt):
When using an external gcc 4.8+ and not building libstdc++ then create in the objectdir a
fake libstdc++.so and libstdc++.a which is a symlink on libc++ that allow g++ to satisfy
its links dependencies in the least hackish way.
Please note that this hacky libstds++ never get installed on the final system

Reviewed by: imp

MFC r273434 (by bapt):
Do not define bad_array_new_length::bad_array_new_length in libc++ anymore
when used in combinaison with libcxxrt since it is now defined there already.
This fixes building world

MFC r276417:
Import libcxxrt master 00bc29eb6513624824a6d7db2ebc768a4216a604.

Interesting fixes:
76584a0 Reorganize code to use only 32bit atomic ops for 32bit platforms
30d2ae5 Implement __cxa_throw_bad_array_new_length

Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D1390

MFC r277217:
Import libc++ trunk r224926. This fixes a number of bugs, completes
C++14 support[1], adds more C++1z features[2], and fixes the following
LWG issues[3]:

1450: Contradiction in regex_constants
2003: String exception inconsistency in erase.
2075: Progress guarantees, lock-free property, and scheduling
assumptions
2104: unique_lock move-assignment should not be noexcept
2112: User-defined classes that cannot be derived from
2132: std::function ambiguity
2135: Unclear requirement for exceptions thrown in
condition_variable::wait()
2142: packaged_task::operator() synchronization too broad?
2182: Container::[const_]reference types are misleadingly specified
2186: Incomplete action on async/launch::deferred
2188: Reverse iterator does not fully support targets that overload
operator&
2193: Default constructors for standard library containers are explicit
2205: Problematic postconditions of regex_match and regex_search
2213: Return value of std::regex_replace
2240: Probable misuse of term "function scope" in [thread.condition]
2252: Strong guarantee on vector::push_back() still broken with C++11?
2257: Simplify container requirements with the new algorithms
2258: a.erase(q1, q2) unable to directly return q2
2263: Comparing iterators and allocator pointers with different
const-character
2268: Setting a default argument in the declaration of a member
function assign of std::basic_string
2271: regex_traits::lookup_classname specification unclear
2272: quoted should use char_traits::eq for character comparison
2278: User-defined literals for Standard Library types
2280: begin / end for arrays should be constexpr and noexcept
2285: make_reverse_iterator
2288: Inconsistent requirements for shared mutexes
2291: std::hash is vulnerable to collision DoS attack
2293: Wrong facet used by num_put::do_put
2299: Effects of inaccessible key_compare::is_transparent type are not
clear
2301: Why is std::tie not constexpr?
2304: Complexity of count in unordered associative containers
2306: match_results::reference should be value_type&, not const
value_type&
2308: Clarify container destructor requirements w.r.t. std::array
2313: tuple_size should always derive from integral_constant<size_t, N>
2314: apply() should return decltype(auto) and use decay_t before
tuple_size
2315: weak_ptr should be movable
2316: weak_ptr::lock() should be atomic
2317: The type property queries should be UnaryTypeTraits returning
size_t
2320: select_on_container_copy_construction() takes allocators, not
containers
2322: Associative(initializer_list, stuff) constructors are
underspecified
2323: vector::resize(n, t)'s specification should be simplified
2324: Insert iterator constructors should use addressof()
2329: regex_match()/regex_search() with match_results should forbid
temporary strings
2330: regex("meow", regex::icase) is technically forbidden but should
be permitted
2332: regex_iterator/regex_token_iterator should forbid temporary
regexes
2339: Wording issue in nth_element
2341: Inconsistency between basic_ostream::seekp(pos) and
basic_ostream::seekp(off, dir)
2344: quoted()'s interaction with padding is unclear
2346: integral_constant's member functions should be marked noexcept
2350: min, max, and minmax should be constexpr
2356: Stability of erasure in unordered associative containers
2357: Remaining "Assignable" requirement
2359: How does regex_constants::nosubs affect basic_regex::mark_count()?
2360: reverse_iterator::operator*() is unimplementable

[1] http://libcxx.llvm.org/cxx1y_status.html
[2] http://libcxx.llvm.org/cxx1z_status.html
[3] http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html

Exp-run: antoine

MFC r277944:
Partially revert r273382, to reduce diffs against upstream. This was a
temporary fix to solve a conflict with an older version of libc++, and
it is no longer relevant.

MFC r278010:
Revert r256642, not only to reduce diffs against upstream libcxxrt, but
also because it is the wrong approach: comparing typeinfo names deeply
causes trouble if two loaded DSOs use independent types of the same
name.

In addition, this particular change was never merged to FreeBSD 10.x and
9.x, so let's get rid of it before it ends up in an 11.x release.

Discussed with: theraven, joerg@netbsd

MFC r278016:
Import libcxxrt master 1cb607e89f6135bbc10f3d3b6fba1f983e258dcc.

Interesting fixes:
1cb607e Correct gcc version check for __cxa_begin_catch() declaration
with or without throw()

Revert r278017 (MFC of r273381 and r276417) and r278018 (MFC of r273434)
until I can figure out why it leads to link failures in some scenarios.

MFC r273434 (by bapt):

Do not define bad_array_new_length::bad_array_new_length in libc++ anymore
when used in combinaison with libcxxrt since it is now defined there already.
This fixes building world

MFC r261283:

Import libc++ 3.4 release. This contains a lot of bugfixes, and some
preliminary support for C++1y.

MFC r261604:

HEAD is not buildable for the past day. Commit a 'quick fix' in order to permit
buildworld to complete.

Reviewed by: theraven

MFC r261608:

Apply a cleaner solution for the sign warnings that can occur when
compiling libc++'s <locale> header with -Wsystem-headers on.

This has also been submitted upstream.

Reported by: asomers

MFC r261801:

An ABI incompatibility crept into the libc++ 3.4 import in r261283. It
was caused by upstream libc++ commit r194536, which aimed to make the
headers more standards-compliant, by making std::pair's copy constructor
trivial. Unfortunately, this could cause certain C++ applications using
shared libraries built against the previous version of libc++ to crash.

Fix the ABI incompatibility by making std::pair's copy constructor
non-trivial again.

Please note: Any C++ applications or shared libraries built with libc++
between r261283 and this revision should be recompiled.

Reported by: stefanf

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Import new libcxxrt / libc++. This brings some bug fixes, including a potential race condition for static initialisers.

Merge libc++ trunk r180598. Contains several minor cleanups and bug
fixes, no major changes.

MFC after: 2 weeks

Import new libc++ to head. Various small fixes and cleanups.

MFC after: 2 weeks

Import new version of libc++ into base.

Import libc++ trunk r165949. Among other improvements and bug fixes,
this has many visibility problems fixed, which should help with
compiling certain ports that exercise C++11 mode (i.e. Firefox).

Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
which are referred to in all the source files.

MFC after: 1 month

Import new version of libc++. Among other improvements, this comes with an
<atomic> header that works with clang 3.1 (and, importantly, the pre-3.1
snapshot currently in head)

Import a slightly newer libc++, with some bugs fixed that were found by running
the test suite on FreeBSD.

Approved by: dim (mentor)

Import new versions of libcxxrt and libc++.
Please tests any C++ code you care about with -stdlib=libc++!

Approved by: dim (mentor)

Import libc++ / libcxxrt into base. Not build by default yet (use
MK_LIBCPLUSPLUS=yes to enable). This is a work-in-progress. It works for
me, but is not guaranteed to work for anyone else and may eat your dog.

To build C++ using libc++, add -stdlib=libc++ to your CXX and LD flags.

Bug reports welcome, bug fixes even more welcome...

Approved by: dim (mentor)