Add libc++ and libc++abi to third-party.

third_party/libcxx/include/__config

+// -*- C++ -*-
+//===--------------------------- __config ---------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_CONFIG
+#define _LIBCPP_CONFIG
+
+#if !defined(_MSC_VER) || defined(__clang__)
+#pragma GCC system_header
+#endif
+
+#ifdef __GNUC__
+#define _GNUC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
+#endif
+
+#define _LIBCPP_VERSION 1101
+
+#define _LIBCPP_ABI_VERSION 1
+
+#define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
+#define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y)
+
+#define _LIBCPP_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION)
+
+#ifdef __LITTLE_ENDIAN__
+#if __LITTLE_ENDIAN__
+#define _LIBCPP_LITTLE_ENDIAN 1
+#define _LIBCPP_BIG_ENDIAN    0
+#endif  // __LITTLE_ENDIAN__
+#endif  // __LITTLE_ENDIAN__
+
+#ifdef __BIG_ENDIAN__
+#if __BIG_ENDIAN__
+#define _LIBCPP_LITTLE_ENDIAN 0
+#define _LIBCPP_BIG_ENDIAN    1
+#endif  // __BIG_ENDIAN__
+#endif  // __BIG_ENDIAN__
+
+#ifdef __FreeBSD__
+# include <sys/endian.h>
+#  if _BYTE_ORDER == _LITTLE_ENDIAN
+#   define _LIBCPP_LITTLE_ENDIAN 1
+#   define _LIBCPP_BIG_ENDIAN    0
+# else  // _BYTE_ORDER == _LITTLE_ENDIAN
+#   define _LIBCPP_LITTLE_ENDIAN 0
+#   define _LIBCPP_BIG_ENDIAN    1
+# endif  // _BYTE_ORDER == _LITTLE_ENDIAN
+# ifndef __LONG_LONG_SUPPORTED
+#  define _LIBCPP_HAS_NO_LONG_LONG
+# endif  // __LONG_LONG_SUPPORTED
+#endif  // __FreeBSD__
+
+#ifdef __NetBSD__
+# include <sys/endian.h>
+#  if _BYTE_ORDER == _LITTLE_ENDIAN
+#   define _LIBCPP_LITTLE_ENDIAN 1
+#   define _LIBCPP_BIG_ENDIAN    0
+# else  // _BYTE_ORDER == _LITTLE_ENDIAN
+#   define _LIBCPP_LITTLE_ENDIAN 0
+#   define _LIBCPP_BIG_ENDIAN    1
+# endif  // _BYTE_ORDER == _LITTLE_ENDIAN
+# define _LIBCPP_HAS_QUICK_EXIT
+#endif  // __NetBSD__
+
+#ifdef _WIN32
+#  define _LIBCPP_LITTLE_ENDIAN 1
+#  define _LIBCPP_BIG_ENDIAN    0
+// Compiler intrinsics (GCC or MSVC)
+#  if defined(__clang__) \
+   || (defined(_MSC_VER) && _MSC_VER >= 1400) \
+   || (defined(__GNUC__) && _GNUC_VER > 403)
+#    define _LIBCPP_HAS_IS_BASE_OF
+#  endif
+#  if defined(_MSC_VER) && !defined(__clang__)
+#    define _LIBCPP_MSVC // Using Microsoft Visual C++ compiler
+#    define _LIBCPP_TOSTRING2(x) #x
+#    define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
+#    define _LIBCPP_WARNING(x) __pragma(message(__FILE__ "(" _LIBCPP_TOSTRING(__LINE__) ") : warning note: " x))
+#  endif
+#  // If mingw not explicitly detected, assume using MS C runtime only.
+#  ifndef __MINGW32__
+#    define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
+#  endif
+#endif  // _WIN32
+
+#ifdef __linux__
+#  if defined(__GNUC__) && _GNUC_VER >= 403
+#    define _LIBCPP_HAS_IS_BASE_OF
+#  endif
+#endif
+
+#ifdef __sun__
+# include <sys/isa_defs.h>
+# ifdef _LITTLE_ENDIAN
+#   define _LIBCPP_LITTLE_ENDIAN 1
+#   define _LIBCPP_BIG_ENDIAN    0
+# else
+#   define _LIBCPP_LITTLE_ENDIAN 0
+#   define _LIBCPP_BIG_ENDIAN    1
+# endif
+#endif // __sun__
+
+#if !defined(_LIBCPP_LITTLE_ENDIAN) || !defined(_LIBCPP_BIG_ENDIAN)
+# include <endian.h>
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define _LIBCPP_LITTLE_ENDIAN 1
+#  define _LIBCPP_BIG_ENDIAN    0
+# elif __BYTE_ORDER == __BIG_ENDIAN
+#  define _LIBCPP_LITTLE_ENDIAN 0
+#  define _LIBCPP_BIG_ENDIAN    1
+# else  // __BYTE_ORDER == __BIG_ENDIAN
+#  error unable to determine endian
+# endif
+#endif  // !defined(_LIBCPP_LITTLE_ENDIAN) || !defined(_LIBCPP_BIG_ENDIAN)
+
+#ifdef _WIN32
+
+// only really useful for a DLL
+#ifdef _LIBCPP_DLL // this should be a compiler builtin define ideally...
+# ifdef cxx_EXPORTS
+#  define _LIBCPP_HIDDEN
+#  define _LIBCPP_FUNC_VIS __declspec(dllexport)
+#  define _LIBCPP_TYPE_VIS __declspec(dllexport)
+# else
+#  define _LIBCPP_HIDDEN
+#  define _LIBCPP_FUNC_VIS __declspec(dllimport)
+#  define _LIBCPP_TYPE_VIS __declspec(dllimport)
+# endif
+#else
+# define _LIBCPP_HIDDEN
+# define _LIBCPP_FUNC_VIS
+# define _LIBCPP_TYPE_VIS
+#endif
+
+#define _LIBCPP_TYPE_VIS_ONLY
+#define _LIBCPP_FUNC_VIS_ONLY
+
+#ifndef _LIBCPP_INLINE_VISIBILITY
+# ifdef _LIBCPP_MSVC
+#  define _LIBCPP_INLINE_VISIBILITY __forceinline
+# else // MinGW GCC and Clang
+#  define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__always_inline__))
+# endif
+#endif
+
+#ifndef _LIBCPP_EXCEPTION_ABI
+#define _LIBCPP_EXCEPTION_ABI _LIBCPP_TYPE_VIS
+#endif
+
+#ifndef _LIBCPP_ALWAYS_INLINE
+# ifdef _LIBCPP_MSVC
+#  define _LIBCPP_ALWAYS_INLINE __forceinline
+# endif
+#endif
+
+#endif // _WIN32
+
+#ifndef __has_attribute
+#define __has_attribute(__x) 0
+#endif
+
+#ifndef _LIBCPP_HIDDEN
+#define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden")))
+#endif
+
+#ifndef _LIBCPP_FUNC_VIS
+#define _LIBCPP_FUNC_VIS __attribute__ ((__visibility__("default")))
+#endif
+
+#ifndef _LIBCPP_TYPE_VIS
+#  if __has_attribute(type_visibility)
+#    define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
+#  else
+#    define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
+#  endif
+#endif
+
+#ifndef _LIBCPP_TYPE_VIS_ONLY
+# define _LIBCPP_TYPE_VIS_ONLY _LIBCPP_TYPE_VIS
+#endif
+
+#ifndef _LIBCPP_FUNC_VIS_ONLY
+# define _LIBCPP_FUNC_VIS_ONLY _LIBCPP_FUNC_VIS
+#endif
+
+#ifndef _LIBCPP_INLINE_VISIBILITY
+#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__visibility__("hidden"), __always_inline__))
+#endif
+
+#ifndef _LIBCPP_EXCEPTION_ABI
+#define _LIBCPP_EXCEPTION_ABI _LIBCPP_TYPE_VIS
+#endif
+
+#ifndef _LIBCPP_ALWAYS_INLINE
+#define _LIBCPP_ALWAYS_INLINE  __attribute__ ((__visibility__("hidden"), __always_inline__))
+#endif
+
+#if defined(__clang__)
+
+#if __has_feature(cxx_alignas)
+#  define _ALIGNAS_TYPE(x) alignas(x)
+#  define _ALIGNAS(x) alignas(x)
+#else
+#  define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+#  define _ALIGNAS(x) __attribute__((__aligned__(x)))
+#endif
+
+#if !__has_feature(cxx_alias_templates)
+#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
+#endif
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+#ifdef __linux__
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#else
+typedef __char16_t char16_t;
+typedef __char32_t char32_t;
+#endif
+#endif
+
+#if !(__has_feature(cxx_exceptions))
+#define _LIBCPP_NO_EXCEPTIONS
+#endif
+
+#if !(__has_feature(cxx_rtti))
+#define _LIBCPP_NO_RTTI
+#endif
+
+#if !(__has_feature(cxx_strong_enums))
+#define _LIBCPP_HAS_NO_STRONG_ENUMS
+#endif
+
+#if !(__has_feature(cxx_decltype))
+#define _LIBCPP_HAS_NO_DECLTYPE
+#endif
+
+#if __has_feature(cxx_attributes)
+#  define _LIBCPP_NORETURN [[noreturn]]
+#else
+#  define _LIBCPP_NORETURN __attribute__ ((noreturn))
+#endif
+
+#if !(__has_feature(cxx_defaulted_functions))
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#endif  // !(__has_feature(cxx_defaulted_functions))
+
+#if !(__has_feature(cxx_deleted_functions))
+#define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#endif  // !(__has_feature(cxx_deleted_functions))
+
+#if !(__has_feature(cxx_lambdas))
+#define _LIBCPP_HAS_NO_LAMBDAS
+#endif
+
+#if !(__has_feature(cxx_nullptr))
+#define _LIBCPP_HAS_NO_NULLPTR
+#endif
+
+#if !(__has_feature(cxx_rvalue_references))
+#define _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#endif
+
+#if !(__has_feature(cxx_static_assert))
+#define _LIBCPP_HAS_NO_STATIC_ASSERT
+#endif
+
+#if !(__has_feature(cxx_auto_type))
+#define _LIBCPP_HAS_NO_AUTO_TYPE
+#endif
+
+#if !(__has_feature(cxx_access_control_sfinae)) || !__has_feature(cxx_trailing_return)
+#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
+#endif
+
+#if !(__has_feature(cxx_variadic_templates))
+#define _LIBCPP_HAS_NO_VARIADICS
+#endif
+
+#if !(__has_feature(cxx_trailing_return))
+#define _LIBCPP_HAS_NO_TRAILING_RETURN
+#endif
+
+#if !(__has_feature(cxx_generalized_initializers))
+#define _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
+#endif
+
+#if __has_feature(is_base_of)
+#  define _LIBCPP_HAS_IS_BASE_OF
+#endif
+
+// Objective-C++ features (opt-in)
+#if __has_feature(objc_arc)
+#define _LIBCPP_HAS_OBJC_ARC
+#endif
+
+#if __has_feature(objc_arc_weak)
+#define _LIBCPP_HAS_OBJC_ARC_WEAK
+#define _LIBCPP_HAS_NO_STRONG_ENUMS
+#endif
+
+#if !(__has_feature(cxx_constexpr))
+#define _LIBCPP_HAS_NO_CONSTEXPR
+#endif
+
+#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
+#if defined(__FreeBSD__)
+#define _LIBCPP_HAS_QUICK_EXIT
+#define _LIBCPP_HAS_C11_FEATURES
+#elif defined(__linux__)
+#include <features.h>
+#if __GLIBC_PREREQ(2, 15)
+#define _LIBCPP_HAS_QUICK_EXIT
+#endif
+#if __GLIBC_PREREQ(2, 17)
+#define _LIBCPP_HAS_C11_FEATURES
+#endif
+#endif
+#endif
+
+#if (__has_feature(cxx_noexcept))
+#  define _NOEXCEPT noexcept
+#  define _NOEXCEPT_(x) noexcept(x)
+#else
+#  define _NOEXCEPT throw()
+#  define _NOEXCEPT_(x)
+#endif
+
+#if __has_feature(underlying_type)
+#  define _LIBCXX_UNDERLYING_TYPE(T) __underlying_type(T)
+#endif
+
+// Inline namespaces are available in Clang regardless of C++ dialect.
+#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace _LIBCPP_NAMESPACE {
+#define _LIBCPP_END_NAMESPACE_STD  } }
+#define _VSTD std::_LIBCPP_NAMESPACE
+
+namespace std {
+  inline namespace _LIBCPP_NAMESPACE {
+  }
+}
+
+#elif defined(__GNUC__)
+
+#define _ALIGNAS(x) __attribute__((__aligned__(x)))
+#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+
+#define _LIBCPP_NORETURN __attribute__((noreturn))
+
+#if !__EXCEPTIONS
+#define _LIBCPP_NO_EXCEPTIONS
+#endif
+
+#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
+#define _LIBCPP_HAS_NO_CONSTEXPR
+
+#define _NOEXCEPT throw()
+#define _NOEXCEPT_(x)
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+
+#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
+#define _LIBCPP_HAS_NO_DECLTYPE
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#define _LIBCPP_HAS_NO_NULLPTR
+#define _LIBCPP_HAS_NO_STATIC_ASSERT
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#define _LIBCPP_HAS_NO_VARIADICS
+#define _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
+
+#else  // __GXX_EXPERIMENTAL_CXX0X__
+
+#define _LIBCPP_HAS_NO_TRAILING_RETURN
+#define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
+
+#if _GNUC_VER < 403
+#define _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#endif
+
+#if _GNUC_VER < 403
+#define _LIBCPP_HAS_NO_STATIC_ASSERT
+#endif
+
+#if _GNUC_VER < 404
+#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
+#define _LIBCPP_HAS_NO_DECLTYPE
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#define _LIBCPP_HAS_NO_VARIADICS
+#define _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
+#endif  // _GNUC_VER < 404
+
+#if _GNUC_VER < 406
+#define _LIBCPP_HAS_NO_NULLPTR
+#endif
+
+#endif  // __GXX_EXPERIMENTAL_CXX0X__
+
+#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { namespace _LIBCPP_NAMESPACE {
+#define _LIBCPP_END_NAMESPACE_STD  } }
+#define _VSTD std::_LIBCPP_NAMESPACE
+
+namespace std {
+namespace _LIBCPP_NAMESPACE {
+}
+using namespace _LIBCPP_NAMESPACE __attribute__((__strong__));
+}
+
+#elif defined(_LIBCPP_MSVC)
+
+#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
+#define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
+#define _LIBCPP_HAS_NO_CONSTEXPR
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#define _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#define _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#define __alignof__ __alignof
+#define _LIBCPP_NORETURN __declspec(noreturn)
+#define _ALIGNAS(x) __declspec(align(x))
+#define _LIBCPP_HAS_NO_VARIADICS
+
+#define _NOEXCEPT throw()
+#define _NOEXCEPT_(x)
+
+#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {
+#define _LIBCPP_END_NAMESPACE_STD  }
+#define _VSTD std
+
+#  define _LIBCPP_WEAK
+namespace std {
+}
+
+#elif defined(__IBMCPP__)
+
+#define _ALIGNAS(x) __attribute__((__aligned__(x)))
+#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(__alignof(x))))
+#define _ATTRIBUTE(x) __attribute__((x))
+#define _LIBCPP_NORETURN __attribute__((noreturn))
+
+#define _NOEXCEPT throw()
+#define _NOEXCEPT_(x)
+
+#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
+#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
+#define _LIBCPP_HAS_NO_ALWAYS_INLINE_VARIADICS
+#define _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
+#define _LIBCPP_HAS_NO_NULLPTR
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#define _LIBCPP_HAS_NO_STRONG_ENUMS
+#define _LIBCPP_HAS_IS_BASE_OF
+
+#if defined(_AIX)
+#define __MULTILOCALE_API
+#endif
+
+#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace _LIBCPP_NAMESPACE {
+#define _LIBCPP_END_NAMESPACE_STD  } }
+#define _VSTD std::_LIBCPP_NAMESPACE
+
+namespace std {
+  inline namespace _LIBCPP_NAMESPACE {
+  }
+}
+
+#endif // __clang__ || __GNUC___ || _MSC_VER || __IBMCPP__
+
+#ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
+typedef unsigned short char16_t;
+typedef unsigned int   char32_t;
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+#ifdef _LIBCPP_HAS_NO_STATIC_ASSERT
+
+template <bool> struct __static_assert_test;
+template <> struct __static_assert_test<true> {};
+template <unsigned> struct __static_assert_check {};
+#define static_assert(__b, __m) \
+    typedef __static_assert_check<sizeof(__static_assert_test<(__b)>)> \
+    _LIBCPP_CONCAT(__t, __LINE__)
+
+#endif  // _LIBCPP_HAS_NO_STATIC_ASSERT
+
+#ifdef _LIBCPP_HAS_NO_DECLTYPE
+#define decltype(x) __typeof__(x)
+#endif
+
+#ifdef _LIBCPP_HAS_NO_CONSTEXPR
+#define _LIBCPP_CONSTEXPR
+#else
+#define _LIBCPP_CONSTEXPR constexpr
+#endif
+
+#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
+#define _LIBCPP_DEFAULT {}
+#else
+#define _LIBCPP_DEFAULT = default;
+#endif
+
+#ifdef __GNUC__
+#define _NOALIAS __attribute__((__malloc__))
+#else
+#define _NOALIAS
+#endif
+
+#ifndef __has_feature
+#define __has_feature(__x) 0
+#endif
+
+#if __has_feature(cxx_explicit_conversions)
+#   define _LIBCPP_EXPLICIT explicit
+#else
+#   define _LIBCPP_EXPLICIT
+#endif
+
+#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
+#define _LIBCPP_DECLARE_STRONG_ENUM(x) struct _LIBCPP_TYPE_VIS x { enum __lx
+#define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \
+    __lx __v_; \
+    _LIBCPP_ALWAYS_INLINE x(__lx __v) : __v_(__v) {} \
+    _LIBCPP_ALWAYS_INLINE explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
+    _LIBCPP_ALWAYS_INLINE operator int() const {return __v_;} \
+    };
+#else  // _LIBCPP_HAS_NO_STRONG_ENUMS
+#define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_TYPE_VIS x
+#define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
+#endif  // _LIBCPP_HAS_NO_STRONG_ENUMS
+
+#ifdef _LIBCPP_DEBUG
+#   if _LIBCPP_DEBUG == 0
+#       define _LIBCPP_DEBUG_LEVEL 1
+#   elif _LIBCPP_DEBUG == 1
+#       define _LIBCPP_DEBUG_LEVEL 2
+#   else
+#       error Supported values for _LIBCPP_DEBUG are 0 and 1
+#   endif
+#   define _LIBCPP_EXTERN_TEMPLATE(...)
+#endif
+
+#ifndef _LIBCPP_EXTERN_TEMPLATE
+#define _LIBCPP_EXTERN_TEMPLATE(...)
+#endif
+
+#ifndef _LIBCPP_EXTERN_TEMPLATE2
+#define _LIBCPP_EXTERN_TEMPLATE2(...) extern template __VA_ARGS__;
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_WIN32) || defined(__sun__) || defined(__NetBSD__)
+#define _LIBCPP_LOCALE__L_EXTENSIONS 1
+#endif
+#ifdef __FreeBSD__
+#define _DECLARE_C99_LDBL_MATH 1
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#define _LIBCPP_HAS_DEFAULTRUNELOCALE
+#endif
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)
+#define _LIBCPP_WCTYPE_IS_MASK
+#endif
+
+#ifndef _LIBCPP_STD_VER
+#  if  __cplusplus <= 201103L
+#    define _LIBCPP_STD_VER 11
+#  else
+#    define _LIBCPP_STD_VER 13  // current year, or date of c++14 ratification
+#  endif
+#endif  // _LIBCPP_STD_VER
+
+#if _LIBCPP_STD_VER > 11
+#define _LIBCPP_DEPRECATED [[deprecated]]
+#else
+#define _LIBCPP_DEPRECATED
+#endif
+
+#if _LIBCPP_STD_VER <= 11
+#define _LIBCPP_CONSTEXPR_AFTER_CXX11
+#define _LIBCPP_EXPLICIT_AFTER_CXX11
+#define _LIBCPP_DEPRECATED_AFTER_CXX11
+#else
+#define _LIBCPP_CONSTEXPR_AFTER_CXX11 constexpr
+#define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit
+#define _LIBCPP_DEPRECATED_AFTER_CXX11 [[deprecated]]
+#endif
+
+// Try to find out if RTTI is disabled.
+// g++ and cl.exe have RTTI on by default and define a macro when it is.
+// g++ only defines the macro in 4.3.2 and onwards.
+#if !defined(_LIBCPP_NO_RTTI)
+#  if defined(__GNUG__) && (__GNUC__ >= 4 && \
+   (__GNUC_MINOR__ >= 3 || __GNUC_PATCHLEVEL__ >= 2)) && !defined(__GXX_RTTI)
+#    define _LIBCPP_NO_RTTI
+#  elif (defined(_MSC_VER) && !defined(__clang__)) && !defined(_CPPRTTI)
+#    define _LIBCPP_NO_RTTI
+#  endif
+#endif
+
+#ifndef _LIBCPP_WEAK
+#  define _LIBCPP_WEAK __attribute__((__weak__))
+#endif
+
+#endif  // _LIBCPP_CONFIG