[libcxx] r342073 - Implement the infrastructure for feature-test macros. Very few actual feature test macros, though. Reviewed as: https://reviews.llvm.org/D51955

Eric Fiselier via cfe-commits cfe-commits at lists.llvm.org
Tue Oct 2 11:52:33 PDT 2018


On Tue, Oct 2, 2018 at 1:33 PM Christof Douma via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Hi Marshall.
>
> I think that this patch breaks backwards compatibility.  Assumes that the
> header file "version" is used by C++ projects that use a C++ standard that
> did not specify a 'version' header. Many toolchains will put search paths
> specified with -I in front of the system search path. The result is that
> the application header file is included whenever a standard header file is
> included. That is unexpected and can break builds.
>
> Do you agree this is an issue or do you consider this an issue with the
> way toolchains handle include search paths?


If I understand correctly, you have user code which provides a header
called "version", and now when files like <utility> include <version> they
pick up the user header instead of the STL one?
Are you specifying custom libc++ include paths when this occurs? Or just
passing "-stdlib=libc++" and letting the compiler do the rest?

In general, I don't consider this a bug. There is no way for libc++ to make
the <version> file disappear in older dialects, and libc++ headers are free
to include w/e additional headers
they need.



>
> Thanks,
> Christof
>
>
> On 12/09/2018, 20:42, "cfe-commits on behalf of Marshall Clow via
> cfe-commits" <cfe-commits-bounces at lists.llvm.org on behalf of
> cfe-commits at lists.llvm.org> wrote:
>
>     Author: marshall
>     Date: Wed Sep 12 12:41:40 2018
>     New Revision: 342073
>
>     URL: http://llvm.org/viewvc/llvm-project?rev=342073&view=rev
>     Log:
>     Implement the infrastructure for feature-test macros. Very few actual
> feature test macros, though. Reviewed as: https://reviews.llvm.org/D51955
>
>     Added:
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/list.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/map.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/memory.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/memory_resource.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/mutex.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/new.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/numeric.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/optional.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/regex.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/scoped_allocator.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/set.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/shared_mutex.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/string.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/string_view.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/tuple.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/type_traits.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/unordered_map.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/unordered_set.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/utility.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/variant.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/vector.version.pass.cpp
>
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
>     Modified:
>         libcxx/trunk/include/algorithm
>         libcxx/trunk/include/any
>         libcxx/trunk/include/array
>         libcxx/trunk/include/atomic
>         libcxx/trunk/include/bit
>         libcxx/trunk/include/chrono
>         libcxx/trunk/include/cmath
>         libcxx/trunk/include/complex
>         libcxx/trunk/include/cstddef
>         libcxx/trunk/include/deque
>         libcxx/trunk/include/exception
>         libcxx/trunk/include/filesystem
>         libcxx/trunk/include/forward_list
>         libcxx/trunk/include/functional
>         libcxx/trunk/include/iomanip
>         libcxx/trunk/include/iterator
>         libcxx/trunk/include/list
>         libcxx/trunk/include/map
>         libcxx/trunk/include/memory
>         libcxx/trunk/include/mutex
>         libcxx/trunk/include/new
>         libcxx/trunk/include/numeric
>         libcxx/trunk/include/optional
>         libcxx/trunk/include/regex
>         libcxx/trunk/include/scoped_allocator
>         libcxx/trunk/include/set
>         libcxx/trunk/include/shared_mutex
>         libcxx/trunk/include/string
>         libcxx/trunk/include/string_view
>         libcxx/trunk/include/tuple
>         libcxx/trunk/include/type_traits
>         libcxx/trunk/include/unordered_map
>         libcxx/trunk/include/unordered_set
>         libcxx/trunk/include/utility
>         libcxx/trunk/include/variant
>         libcxx/trunk/include/vector
>         libcxx/trunk/include/version
>
>     Modified: libcxx/trunk/include/algorithm
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/algorithm?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/algorithm (original)
>     +++ libcxx/trunk/include/algorithm Wed Sep 12 12:41:40 2018
>     @@ -646,6 +646,7 @@ template <class BidirectionalIterator, c
>      #include <iterator>
>      #include <cstddef>
>      #include <bit>
>     +#include <version>
>
>      #include <__debug>
>
>
>     Modified: libcxx/trunk/include/any
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/any?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/any (original)
>     +++ libcxx/trunk/include/any Wed Sep 12 12:41:40 2018
>     @@ -87,6 +87,7 @@ namespace std {
>      #include <typeinfo>
>      #include <type_traits>
>      #include <cstdlib>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/array
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/array?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/array (original)
>     +++ libcxx/trunk/include/array Wed Sep 12 12:41:40 2018
>     @@ -112,6 +112,7 @@ template <size_t I, class T, size_t N> c
>      #include <algorithm>
>      #include <stdexcept>
>      #include <cstdlib> // for _LIBCPP_UNREACHABLE
>     +#include <version>
>      #include <__debug>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>
>     Modified: libcxx/trunk/include/atomic
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/atomic?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/atomic (original)
>     +++ libcxx/trunk/include/atomic Wed Sep 12 12:41:40 2018
>     @@ -544,6 +544,7 @@ void atomic_signal_fence(memory_order m)
>      #include <cstddef>
>      #include <cstdint>
>      #include <type_traits>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>     @@ -559,10 +560,6 @@ void atomic_signal_fence(memory_order m)
>      #error C++ standard library is incompatible with <stdatomic.h>
>      #endif
>
>     -#if _LIBCPP_STD_VER > 14
>     -# define __cpp_lib_atomic_is_always_lock_free 201603L
>     -#endif
>     -
>      #define _LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) \
>        _LIBCPP_DIAGNOSE_WARNING(__m == memory_order_consume || \
>                                 __m == memory_order_acquire || \
>
>     Modified: libcxx/trunk/include/bit
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/bit?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/bit (original)
>     +++ libcxx/trunk/include/bit Wed Sep 12 12:41:40 2018
>     @@ -21,6 +21,7 @@ namespace std {
>      */
>
>      #include <__config>
>     +#include <version>
>
>      #if defined(__IBMCPP__)
>      #include "support/ibm/support.h"
>
>     Modified: libcxx/trunk/include/chrono
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/chrono?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/chrono (original)
>     +++ libcxx/trunk/include/chrono Wed Sep 12 12:41:40 2018
>     @@ -798,6 +798,7 @@ constexpr chrono::year
>      #include <type_traits>
>      #include <ratio>
>      #include <limits>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/cmath
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/cmath?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/cmath (original)
>     +++ libcxx/trunk/include/cmath Wed Sep 12 12:41:40 2018
>     @@ -303,6 +303,7 @@ long double    truncl(long double x);
>
>      #include <__config>
>      #include <math.h>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/complex
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/complex?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/complex (original)
>     +++ libcxx/trunk/include/complex Wed Sep 12 12:41:40 2018
>     @@ -245,6 +245,7 @@ template<class T, class charT, class tra
>      #include <stdexcept>
>      #include <cmath>
>      #include <sstream>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/cstddef
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/cstddef?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/cstddef (original)
>     +++ libcxx/trunk/include/cstddef Wed Sep 12 12:41:40 2018
>     @@ -35,6 +35,7 @@ Types:
>      */
>
>      #include <__config>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/deque
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/deque?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/deque (original)
>     +++ libcxx/trunk/include/deque Wed Sep 12 12:41:40 2018
>     @@ -161,6 +161,7 @@ template <class T, class Allocator>
>      #include <iterator>
>      #include <algorithm>
>      #include <stdexcept>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/exception
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/exception?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/exception (original)
>     +++ libcxx/trunk/include/exception Wed Sep 12 12:41:40 2018
>     @@ -81,6 +81,7 @@ template <class E> void rethrow_if_neste
>      #include <cstddef>
>      #include <cstdlib>
>      #include <type_traits>
>     +#include <version>
>
>      #if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
>      #include <vcruntime_exception.h>
>
>     Modified: libcxx/trunk/include/filesystem
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/filesystem?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/filesystem (original)
>     +++ libcxx/trunk/include/filesystem Wed Sep 12 12:41:40 2018
>     @@ -244,6 +244,7 @@
>      #include <utility>
>      #include <iomanip> // for quoted
>      #include <string_view>
>     +#include <version>
>
>      #include <__debug>
>
>     @@ -256,10 +257,6 @@ _LIBCPP_PUSH_MACROS
>
>      #ifndef _LIBCPP_CXX03_LANG
>
>     -#if _LIBCPP_STD_VER >= 17
>     -#define __cpp_lib_filesystem 201703
>     -#endif
>     -
>      _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
>
>      struct _FilesystemClock {
>
>     Modified: libcxx/trunk/include/forward_list
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/forward_list?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/forward_list (original)
>     +++ libcxx/trunk/include/forward_list Wed Sep 12 12:41:40 2018
>     @@ -177,6 +177,7 @@ template <class T, class Allocator>
>      #include <limits>
>      #include <iterator>
>      #include <algorithm>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/functional
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/functional?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/functional (original)
>     +++ libcxx/trunk/include/functional Wed Sep 12 12:41:40 2018
>     @@ -487,6 +487,7 @@ POLICY:  For non-variadic implementation
>      #include <memory>
>      #include <tuple>
>      #include <utility>
>     +#include <version>
>
>      #include <__functional_base>
>
>     @@ -2340,8 +2341,6 @@ bind(_Fp&& __f, _BoundArgs&&... __bound_
>
>      #if _LIBCPP_STD_VER > 14
>
>     -#define __cpp_lib_invoke 201411
>     -
>      template <class _Fn, class ..._Args>
>      result_of_t<_Fn&&(_Args&&...)>
>      invoke(_Fn&& __f, _Args&&... __args)
>
>     Modified: libcxx/trunk/include/iomanip
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/iomanip?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/iomanip (original)
>     +++ libcxx/trunk/include/iomanip Wed Sep 12 12:41:40 2018
>     @@ -46,6 +46,7 @@ template <class charT, class traits, cla
>      #include <__config>
>      #include <__string>
>      #include <istream>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/iterator
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/iterator?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/iterator (original)
>     +++ libcxx/trunk/include/iterator Wed Sep 12 12:41:40 2018
>     @@ -418,6 +418,7 @@ template <class E> constexpr const E* da
>      #include <type_traits>
>      #include <cstddef>
>      #include <initializer_list>
>     +#include <version>
>      #ifdef __APPLE__
>      #include <Availability.h>
>      #endif
>
>     Modified: libcxx/trunk/include/list
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/list?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/list (original)
>     +++ libcxx/trunk/include/list Wed Sep 12 12:41:40 2018
>     @@ -181,6 +181,7 @@ template <class T, class Alloc>
>      #include <iterator>
>      #include <algorithm>
>      #include <type_traits>
>     +#include <version>
>
>      #include <__debug>
>
>
>     Modified: libcxx/trunk/include/map
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/map?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/map (original)
>     +++ libcxx/trunk/include/map Wed Sep 12 12:41:40 2018
>     @@ -460,6 +460,7 @@ swap(multimap<Key, T, Compare, Allocator
>      #include <functional>
>      #include <initializer_list>
>      #include <type_traits>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/memory
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/memory?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/memory (original)
>     +++ libcxx/trunk/include/memory Wed Sep 12 12:41:40 2018
>     @@ -667,6 +667,7 @@ void* align(size_t alignment, size_t siz
>      #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
>      #  include <atomic>
>      #endif
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/mutex
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/mutex?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/mutex (original)
>     +++ libcxx/trunk/include/mutex Wed Sep 12 12:41:40 2018
>     @@ -194,6 +194,7 @@ template<class Callable, class ...Args>
>      #ifndef _LIBCPP_CXX03_LANG
>      #include <tuple>
>      #endif
>     +#include <version>
>      #include <__threading_support>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>
>     Modified: libcxx/trunk/include/new
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/new?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/new (original)
>     +++ libcxx/trunk/include/new Wed Sep 12 12:41:40 2018
>     @@ -91,6 +91,7 @@ void  operator delete[](void* ptr, void*
>      #include <exception>
>      #include <type_traits>
>      #include <cstddef>
>     +#include <version>
>      #ifdef _LIBCPP_NO_EXCEPTIONS
>      #include <cstdlib>
>      #endif
>
>     Modified: libcxx/trunk/include/numeric
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/numeric?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/numeric (original)
>     +++ libcxx/trunk/include/numeric Wed Sep 12 12:41:40 2018
>     @@ -142,6 +142,7 @@ template <class M, class N>
>      #include <iterator>
>      #include <limits> // for numeric_limits
>      #include <functional>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/optional
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/optional?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/optional (original)
>     +++ libcxx/trunk/include/optional Wed Sep 12 12:41:40 2018
>     @@ -156,6 +156,7 @@ template<class T>
>      #include <stdexcept>
>      #include <type_traits>
>      #include <utility>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/regex
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/regex?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/regex (original)
>     +++ libcxx/trunk/include/regex Wed Sep 12 12:41:40 2018
>     @@ -769,6 +769,7 @@ typedef regex_token_iterator<wstring::co
>      #include <memory>
>      #include <vector>
>      #include <deque>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/scoped_allocator
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/scoped_allocator?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/scoped_allocator (original)
>     +++ libcxx/trunk/include/scoped_allocator Wed Sep 12 12:41:40 2018
>     @@ -108,6 +108,7 @@ template <class OuterA1, class OuterA2,
>
>      #include <__config>
>      #include <memory>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/set
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/set?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/set (original)
>     +++ libcxx/trunk/include/set Wed Sep 12 12:41:40 2018
>     @@ -402,6 +402,7 @@ swap(multiset<Key, Compare, Allocator>&
>      #include <__tree>
>      #include <__node_handle>
>      #include <functional>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/shared_mutex
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/shared_mutex?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/shared_mutex (original)
>     +++ libcxx/trunk/include/shared_mutex Wed Sep 12 12:41:40 2018
>     @@ -124,6 +124,7 @@ template <class Mutex>
>      */
>
>      #include <__config>
>     +#include <version>
>
>      _LIBCPP_PUSH_MACROS
>      #include <__undef_macros>
>
>     Modified: libcxx/trunk/include/string
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/string?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/string (original)
>     +++ libcxx/trunk/include/string Wed Sep 12 12:41:40 2018
>     @@ -510,6 +510,7 @@ basic_string<char32_t> operator "" s( co
>      #include <type_traits>
>      #include <initializer_list>
>      #include <__functional_base>
>     +#include <version>
>      #ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
>      #include <cstdint>
>      #endif
>
>     Modified: libcxx/trunk/include/string_view
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/string_view?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/string_view (original)
>     +++ libcxx/trunk/include/string_view Wed Sep 12 12:41:40 2018
>     @@ -178,6 +178,7 @@ namespace std {
>      #include <iterator>
>      #include <limits>
>      #include <stdexcept>
>     +#include <version>
>      #include <__debug>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>
>     Modified: libcxx/trunk/include/tuple
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/tuple?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/tuple (original)
>     +++ libcxx/trunk/include/tuple Wed Sep 12 12:41:40 2018
>     @@ -141,6 +141,7 @@ template <class... Types>
>      #include <type_traits>
>      #include <__functional_base>
>      #include <utility>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/type_traits
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/type_traits?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/type_traits (original)
>     +++ libcxx/trunk/include/type_traits Wed Sep 12 12:41:40 2018
>     @@ -404,6 +404,7 @@ namespace std
>      */
>      #include <__config>
>      #include <cstddef>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>     @@ -4758,7 +4759,6 @@ struct __has_operator_addressof
>
>      #if _LIBCPP_STD_VER > 14
>
>     -#define __cpp_lib_void_t 201411
>      template <class...> using void_t = void;
>
>      # ifndef _LIBCPP_HAS_NO_VARIADICS
>
>     Modified: libcxx/trunk/include/unordered_map
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/unordered_map?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/unordered_map (original)
>     +++ libcxx/trunk/include/unordered_map Wed Sep 12 12:41:40 2018
>     @@ -386,6 +386,7 @@ template <class Key, class T, class Hash
>      #include <functional>
>      #include <stdexcept>
>      #include <tuple>
>     +#include <version>
>
>      #include <__debug>
>
>
>     Modified: libcxx/trunk/include/unordered_set
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/unordered_set?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/unordered_set (original)
>     +++ libcxx/trunk/include/unordered_set Wed Sep 12 12:41:40 2018
>     @@ -338,6 +338,7 @@ template <class Value, class Hash, class
>      #include <__hash_table>
>      #include <__node_handle>
>      #include <functional>
>     +#include <version>
>
>      #include <__debug>
>
>
>     Modified: libcxx/trunk/include/utility
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/utility?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/utility (original)
>     +++ libcxx/trunk/include/utility Wed Sep 12 12:41:40 2018
>     @@ -203,6 +203,7 @@ template <size_t I>
>      #include <cstddef>
>      #include <cstring>
>      #include <cstdint>
>     +#include <version>
>      #include <__debug>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>
>     Modified: libcxx/trunk/include/variant
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/variant?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/variant (original)
>     +++ libcxx/trunk/include/variant Wed Sep 12 12:41:40 2018
>     @@ -208,6 +208,7 @@ namespace std {
>      #include <type_traits>
>      #include <utility>
>      #include <limits>
>     +#include <version>
>
>      #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
>      #pragma GCC system_header
>
>     Modified: libcxx/trunk/include/vector
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/vector?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/vector (original)
>     +++ libcxx/trunk/include/vector Wed Sep 12 12:41:40 2018
>     @@ -276,6 +276,7 @@ void swap(vector<T,Allocator>& x, vector
>      #include <stdexcept>
>      #include <algorithm>
>      #include <cstring>
>     +#include <version>
>      #include <__split_buffer>
>      #include <__functional_base>
>
>
>     Modified: libcxx/trunk/include/version
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/version?rev=342073&r1=342072&r2=342073&view=diff
>
> ==============================================================================
>     --- libcxx/trunk/include/version (original)
>     +++ libcxx/trunk/include/version Wed Sep 12 12:41:40 2018
>     @@ -101,4 +101,17 @@ __cpp_lib_void_t
>      #pragma GCC system_header
>      #endif
>
>     +#if _LIBCPP_STD_VER > 11
>     +#endif
>     +
>     +#if _LIBCPP_STD_VER > 14
>     +# define __cpp_lib_atomic_is_always_lock_free           201603L
>     +# define __cpp_lib_filesystem                           201703L
>     +# define __cpp_lib_invoke                               201411L
>     +# define __cpp_lib_void_t                               201411L
>     +#endif
>     +
>     +#if _LIBCPP_STD_VER > 17
>     +#endif
>     +
>      #endif  // _LIBCPP_VERSIONH
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/algorithm.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,36 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <algorithm> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_clamp                             201603L
>     +    __cpp_lib_constexpr_swap_algorithms         201806L
>     +    __cpp_lib_parallel_algorithm                201603L
>     +    __cpp_lib_robust_nonmodifying_seq_ops       201304L
>     +    __cpp_lib_sample                            201603L
>     +
>     +*/
>     +
>     +#include <algorithm>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <algorithm> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/any.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <any> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_any                               201606L
>     +
>     +*/
>     +
>     +#include <any>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in <any>
> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/array.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,33 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <array> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_array_constexpr                   201603L
>     +    __cpp_lib_nonmember_container_access        201411L
>     +
>     +*/
>     +
>     +#include <array>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in <array>
> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/atomic.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,41 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <atomic> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_atomic_is_always_lock_free        201603L
>     +    __cpp_lib_atomic_ref                        201806L
>     +
>     +*/
>     +
>     +#include <atomic>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <atomic> are defined.
>     +
>     +#if _TEST_STD_VER > 14
>     +# if !defined(__cpp_lib_atomic_is_always_lock_free)
>     +#  error "__cpp_lib_atomic_is_always_lock_free is not defined"
>     +# elif __cpp_lib_atomic_is_always_lock_free < 201603L
>     +#  error "__cpp_lib_atomic_is_always_lock_free has an invalid value"
>     +# endif
>     +#endif
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <bit> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_bit_cast                          201806L
>     +
>     +*/
>     +
>     +#include <bit>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in <bit>
> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/chrono.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <chrono> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_chrono                            201611L
>     +
>     +*/
>     +
>     +#include <chrono>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <chrono> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cmath.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,33 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <cmath> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_hypot                             201603L
>     +    __cpp_lib_math_special_functions            201603L
>     +
>     +*/
>     +
>     +#include <cmath>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in <cmath>
> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/complex.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <complex> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_complex_udls                      201309L
>     +
>     +*/
>     +
>     +#include <complex>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <complex> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/concepts.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,33 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <concepts> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_concepts                          201806L
>     +
>     +*/
>     +
>     +// XFAIL
>     +// #include <concepts>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <concepts> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/cstddef.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <cstddef> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_byte                              201603L
>     +
>     +*/
>     +
>     +#include <cstddef>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <cstddef> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/deque.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,33 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <deque> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_allocator_traits_is_always_equal  201411L
>     +    __cpp_lib_nonmember_container_access        201411L
>     +
>     +*/
>     +
>     +#include <deque>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in <deque>
> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/exception.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <exception> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_uncaught_exceptions               201411L
>     +
>     +*/
>     +
>     +#include <exception>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <exception> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/execution.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,33 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <execution> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_execution                         201603L
>     +
>     +*/
>     +
>     +// XFAIL
>     +// #include <execution>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <execution> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/filesystem.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,40 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <filesystem> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_filesystem                        201703L
>     +
>     +*/
>     +
>     +#include <filesystem>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <filesystem> are defined.
>     +
>     +#if _TEST_STD_VER > 14
>     +# if !defined(__cpp_lib_filesystem)
>     +#  error "__cpp_lib_filesystem is not defined"
>     +# elif __cpp_lib_filesystem < 201703L
>     +#  error "__cpp_lib_filesystem has an invalid value"
>     +# endif
>     +#endif
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/forward_list.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,35 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <forward_list> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_allocator_traits_is_always_equal  201411L
>     +    __cpp_lib_incomplete_container_elements     201505L
>     +    __cpp_lib_list_remove_return_type           201806L
>     +    __cpp_lib_nonmember_container_access        201411L
>     +
>     +*/
>     +
>     +#include <forward_list>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <forward_list> are defined.
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/functional.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,44 @@
>     +
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +//                     The LLVM Compiler Infrastructure
>     +//
>     +// This file is dual licensed under the MIT and the University of
> Illinois Open
>     +// Source Licenses. See LICENSE.TXT for details.
>     +//
>
> +//===----------------------------------------------------------------------===//
>     +//
>     +// <functional> feature macros
>     +
>     +/*  Constant                                    Value
>     +    __cpp_lib_boyer_moore_searcher              201603L
>     +    __cpp_lib_invoke                            201411L
>     +    __cpp_lib_not_fn                            201603L
>     +    __cpp_lib_result_of_sfinae                  201210L
>     +    __cpp_lib_transparent_operators             201510L
>     +
>     +*/
>     +
>     +#include <functional>
>     +#include "test_macros.h"
>     +
>     +int main()
>     +{
>     +//  ensure that the macros that are supposed to be defined in
> <functional> are defined.
>     +
>     +#if _TEST_STD_VER > 14
>     +# if !defined(__cpp_lib_invoke)
>     +#  error "__cpp_lib_invoke is not defined"
>     +# elif __cpp_lib_invoke < 201411L
>     +#  error "__cpp_lib_invoke has an invalid value"
>     +# endif
>     +#endif
>     +
>     +/*
>     +#if !defined(__cpp_lib_fooby)
>     +# error "__cpp_lib_fooby is not defined"
>     +#elif __cpp_lib_fooby < 201606L
>     +# error "__cpp_lib_fooby has an invalid value"
>     +#endif
>     +*/
>     +}
>
>     Added:
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
>     URL:
> http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp?rev=342073&view=auto
>
> ==============================================================================
>     ---
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
> (added)
>     +++
> libcxx/trunk/test/std/language.support/support.limits/support.limits.general/iomanip.version.pass.cpp
> Wed Sep 12 12:41:40 2018
>     @@ -0,0 +1,32 @@
>     +
>
> +//===----------------------------------------------------------------------==
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