libcxx: update to LLVM 18

release/18.x branch, commit 78b99c73ee4b96fe9ce0e294d4632326afb2db42

This adds the flag `-D_LIBCPP_HARDENING_MODE` which is determined based
on the Zig optimization mode.

This commit also fixes libunwind, libcxx, and libcxxabi to properly
report sub compilation errors.

1 files changed, 255 insertions, 300 deletions

diff --git a/lib/libcxx/include/array b/lib/libcxx/include/array
index 3fc25d4c30..41f016a485 100644
--- a/lib/libcxx/include/array
+++ b/lib/libcxx/include/array
@@ -131,6 +131,7 @@ template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexce
 #include <__type_traits/is_same.h>
 #include <__type_traits/is_swappable.h>
 #include <__type_traits/remove_cv.h>
+#include <__utility/empty.h>
 #include <__utility/integer_sequence.h>
 #include <__utility/move.h>
 #include <__utility/unreachable.h>
@@ -158,279 +159,257 @@ template <size_t I, class T, size_t N> const T&& get(const array<T, N>&&) noexce
 #  pragma GCC system_header
 #endif
 
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS array
-{
-    // types:
-    typedef array __self;
-    typedef _Tp                                   value_type;
-    typedef value_type&                           reference;
-    typedef const value_type&                     const_reference;
-    typedef value_type*                           iterator;
-    typedef const value_type*                     const_iterator;
-    typedef value_type*                           pointer;
-    typedef const value_type*                     const_pointer;
-    typedef size_t                                size_type;
-    typedef ptrdiff_t                             difference_type;
-    typedef _VSTD::reverse_iterator<iterator>       reverse_iterator;
-    typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
-
-    _Tp __elems_[_Size];
-
-    // No explicit construct/copy/destroy for aggregate type
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-    void fill(const value_type& __u) {
-        _VSTD::fill_n(data(), _Size, __u);
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-    void swap(array& __a) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) {
-        _VSTD::swap_ranges(data(), data() + _Size, __a.data());
-    }
-
-    // iterators:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    iterator begin() _NOEXCEPT {return iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    iterator end() _NOEXCEPT {return iterator(data() + _Size);}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator end() const _NOEXCEPT {return const_iterator(data() + _Size);}
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator cbegin() const _NOEXCEPT {return begin();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator cend() const _NOEXCEPT {return end();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
-
-    // capacity:
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return _Size;}
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return _Size;}
-    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return _Size == 0;}
-
-    // element access:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reference operator[](size_type __n) _NOEXCEPT {
-        _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
-        return __elems_[__n];
-    }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-    const_reference operator[](size_type __n) const _NOEXCEPT {
-        _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
-        return __elems_[__n];
-    }
-
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference at(size_type __n)
-    {
-        if (__n >= _Size)
-            __throw_out_of_range("array::at");
-        return __elems_[__n];
-    }
-
-    _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference at(size_type __n) const
-    {
-        if (__n >= _Size)
-            __throw_out_of_range("array::at");
-        return __elems_[__n];
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17 reference front()             _NOEXCEPT {return (*this)[0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference front() const _NOEXCEPT {return (*this)[0];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17 reference back()              _NOEXCEPT {return (*this)[_Size - 1];}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference back() const  _NOEXCEPT {return (*this)[_Size - 1];}
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    value_type* data() _NOEXCEPT {return __elems_;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const value_type* data() const _NOEXCEPT {return __elems_;}
+struct _LIBCPP_TEMPLATE_VIS array {
+  // types:
+  using __self                 = array;
+  using value_type             = _Tp;
+  using reference              = value_type&;
+  using const_reference        = const value_type&;
+  using iterator               = value_type*;
+  using const_iterator         = const value_type*;
+  using pointer                = value_type*;
+  using const_pointer          = const value_type*;
+  using size_type              = size_t;
+  using difference_type        = ptrdiff_t;
+  using reverse_iterator       = std::reverse_iterator<iterator>;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+
+  _Tp __elems_[_Size];
+
+  // No explicit construct/copy/destroy for aggregate type
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void fill(const value_type& __u) {
+    std::fill_n(data(), _Size, __u);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(array& __a)
+      _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) {
+    std::swap_ranges(data(), data() + _Size, __a.data());
+  }
+
+  // iterators:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 iterator begin() _NOEXCEPT { return iterator(data()); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator begin() const _NOEXCEPT {
+    return const_iterator(data());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 iterator end() _NOEXCEPT { return iterator(data() + _Size); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator end() const _NOEXCEPT {
+    return const_iterator(data() + _Size);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reverse_iterator rbegin() _NOEXCEPT {
+    return reverse_iterator(end());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator rbegin() const _NOEXCEPT {
+    return const_reverse_iterator(end());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reverse_iterator rend() _NOEXCEPT {
+    return reverse_iterator(begin());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator rend() const _NOEXCEPT {
+    return const_reverse_iterator(begin());
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator cbegin() const _NOEXCEPT { return begin(); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator cend() const _NOEXCEPT { return end(); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator crbegin() const _NOEXCEPT {
+    return rbegin();
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator crend() const _NOEXCEPT { return rend(); }
+
+  // capacity:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT { return _Size; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT { return _Size; }
+  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {
+    return _Size == 0;
+  }
+
+  // element access:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference operator[](size_type __n) _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
+    return __elems_[__n];
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference operator[](size_type __n) const _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__n < _Size, "out-of-bounds access in std::array<T, N>");
+    return __elems_[__n];
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference at(size_type __n) {
+    if (__n >= _Size)
+      __throw_out_of_range("array::at");
+    return __elems_[__n];
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference at(size_type __n) const {
+    if (__n >= _Size)
+      __throw_out_of_range("array::at");
+    return __elems_[__n];
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference front() _NOEXCEPT { return (*this)[0]; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference front() const _NOEXCEPT { return (*this)[0]; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference back() _NOEXCEPT { return (*this)[_Size - 1]; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference back() const _NOEXCEPT {
+    return (*this)[_Size - 1];
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 value_type* data() _NOEXCEPT { return __elems_; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const value_type* data() const _NOEXCEPT { return __elems_; }
 };
 
 template <class _Tp>
-struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0>
-{
-    // types:
-    typedef array __self;
-    typedef _Tp                                   value_type;
-    typedef value_type&                           reference;
-    typedef const value_type&                     const_reference;
-    typedef value_type*                           iterator;
-    typedef const value_type*                     const_iterator;
-    typedef value_type*                           pointer;
-    typedef const value_type*                     const_pointer;
-    typedef size_t                                size_type;
-    typedef ptrdiff_t                             difference_type;
-    typedef _VSTD::reverse_iterator<iterator>       reverse_iterator;
-    typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;
-
-    typedef __conditional_t<is_const<_Tp>::value, const char, char> _CharType;
-
-    struct  _ArrayInStructT { _Tp __data_[1]; };
-    _ALIGNAS_TYPE(_ArrayInStructT) _CharType __elems_[sizeof(_ArrayInStructT)];
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    value_type* data() _NOEXCEPT {return nullptr;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const value_type* data() const _NOEXCEPT {return nullptr;}
-
-    // No explicit construct/copy/destroy for aggregate type
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-    void fill(const value_type&) {
-      static_assert(!is_const<_Tp>::value,
-                    "cannot fill zero-sized array of type 'const T'");
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-    void swap(array&) _NOEXCEPT {
-      static_assert(!is_const<_Tp>::value,
-                    "cannot swap zero-sized array of type 'const T'");
-    }
-
-    // iterators:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    iterator begin() _NOEXCEPT {return iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator begin() const _NOEXCEPT {return const_iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    iterator end() _NOEXCEPT {return iterator(data());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator end() const _NOEXCEPT {return const_iterator(data());}
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator rbegin() const _NOEXCEPT {return const_reverse_iterator(end());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator rend() const _NOEXCEPT {return const_reverse_iterator(begin());}
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator cbegin() const _NOEXCEPT {return begin();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_iterator cend() const _NOEXCEPT {return end();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
-
-    // capacity:
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT {return 0; }
-    _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT {return 0;}
-    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
-    _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT {return true;}
-
-    // element access:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reference operator[](size_type) _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-    const_reference operator[](size_type) const _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reference at(size_type) {
-      __throw_out_of_range("array<T, 0>::at");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-    const_reference at(size_type) const {
-      __throw_out_of_range("array<T, 0>::at");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reference front() _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-    const_reference front() const _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX17
-    reference back() _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
-      __libcpp_unreachable();
-    }
-
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-    const_reference back() const _NOEXCEPT {
-      _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
-      __libcpp_unreachable();
-    }
+struct _LIBCPP_TEMPLATE_VIS array<_Tp, 0> {
+  // types:
+  typedef array __self;
+  typedef _Tp value_type;
+  typedef value_type& reference;
+  typedef const value_type& const_reference;
+  typedef value_type* iterator;
+  typedef const value_type* const_iterator;
+  typedef value_type* pointer;
+  typedef const value_type* const_pointer;
+  typedef size_t size_type;
+  typedef ptrdiff_t difference_type;
+  typedef std::reverse_iterator<iterator> reverse_iterator;
+  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+
+  typedef __conditional_t<is_const<_Tp>::value, const __empty, __empty> _EmptyType;
+
+  struct _ArrayInStructT {
+    _Tp __data_[1];
+  };
+  _ALIGNAS_TYPE(_ArrayInStructT) _EmptyType __elems_[sizeof(_ArrayInStructT)];
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 value_type* data() _NOEXCEPT { return nullptr; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const value_type* data() const _NOEXCEPT { return nullptr; }
+
+  // No explicit construct/copy/destroy for aggregate type
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void fill(const value_type&) {
+    static_assert(!is_const<_Tp>::value, "cannot fill zero-sized array of type 'const T'");
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(array&) _NOEXCEPT {
+    static_assert(!is_const<_Tp>::value, "cannot swap zero-sized array of type 'const T'");
+  }
+
+  // iterators:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 iterator begin() _NOEXCEPT { return iterator(data()); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator begin() const _NOEXCEPT {
+    return const_iterator(data());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 iterator end() _NOEXCEPT { return iterator(data()); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator end() const _NOEXCEPT {
+    return const_iterator(data());
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reverse_iterator rbegin() _NOEXCEPT {
+    return reverse_iterator(end());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator rbegin() const _NOEXCEPT {
+    return const_reverse_iterator(end());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reverse_iterator rend() _NOEXCEPT {
+    return reverse_iterator(begin());
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator rend() const _NOEXCEPT {
+    return const_reverse_iterator(begin());
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator cbegin() const _NOEXCEPT { return begin(); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_iterator cend() const _NOEXCEPT { return end(); }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator crbegin() const _NOEXCEPT {
+    return rbegin();
+  }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 const_reverse_iterator crend() const _NOEXCEPT { return rend(); }
+
+  // capacity:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR size_type size() const _NOEXCEPT { return 0; }
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR size_type max_size() const _NOEXCEPT { return 0; }
+  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR bool empty() const _NOEXCEPT { return true; }
+
+  // element access:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference operator[](size_type) _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference operator[](size_type) const _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::operator[] on a zero-sized array");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference at(size_type) {
+    __throw_out_of_range("array<T, 0>::at");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference at(size_type) const {
+    __throw_out_of_range("array<T, 0>::at");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference front() _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference front() const _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::front() on a zero-sized array");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reference back() _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
+    __libcpp_unreachable();
+  }
+
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const_reference back() const _NOEXCEPT {
+    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(false, "cannot call array<T, 0>::back() on a zero-sized array");
+    __libcpp_unreachable();
+  }
 };
 
-
 #if _LIBCPP_STD_VER >= 17
-template<class _Tp, class... _Args,
-         class = enable_if_t<__all<_IsSame<_Tp, _Args>::value...>::value>
-         >
-array(_Tp, _Args...)
-  -> array<_Tp, 1 + sizeof...(_Args)>;
+template <class _Tp, class... _Args, class = enable_if_t<__all<_IsSame<_Tp, _Args>::value...>::value> >
+array(_Tp, _Args...) -> array<_Tp, 1 + sizeof...(_Args)>;
 #endif
 
 template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY
-_LIBCPP_CONSTEXPR_SINCE_CXX20 bool
-operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y)
-{
-    return _VSTD::equal(__x.begin(), __x.end(), __y.begin());
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
+operator==(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
+  return std::equal(__x.begin(), __x.end(), __y.begin());
 }
 
 #if _LIBCPP_STD_VER <= 17
 
 template <class _Tp, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return !(__x == __y);
+  return !(__x == __y);
 }
 
 template <class _Tp, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI bool operator<(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
+  return std::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
 }
 
 template <class _Tp, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI bool operator>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return __y < __x;
+  return __y < __x;
 }
 
 template <class _Tp, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return !(__y < __x);
+  return !(__y < __x);
 }
 
 template <class _Tp, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return !(__x < __y);
+  return !(__x < __y);
 }
 
 #else // _LIBCPP_STD_VER <= 17
@@ -438,111 +417,87 @@ inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const array<_Tp, _Size>& __x, const
 template <class _Tp, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI constexpr __synth_three_way_result<_Tp>
 operator<=>(const array<_Tp, _Size>& __x, const array<_Tp, _Size>& __y) {
-    return std::lexicographical_compare_three_way(
-        __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way<_Tp, _Tp>);
+  return std::lexicographical_compare_three_way(
+      __x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way<_Tp, _Tp>);
 }
 
 #endif // _LIBCPP_STD_VER <= 17
 
-template <class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
-__enable_if_t<_Size == 0 || __is_swappable<_Tp>::value, void>
-swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
-                                  _NOEXCEPT_(noexcept(__x.swap(__y)))
-{
-    __x.swap(__y);
+template <class _Tp, size_t _Size, __enable_if_t<_Size == 0 || __is_swappable<_Tp>::value, int> = 0>
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
+    _NOEXCEPT_(noexcept(__x.swap(__y))) {
+  __x.swap(__y);
 }
 
 template <class _Tp, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> >
-    : public integral_constant<size_t, _Size> {};
+struct _LIBCPP_TEMPLATE_VIS tuple_size<array<_Tp, _Size> > : public integral_constant<size_t, _Size> {};
 
 template <size_t _Ip, class _Tp, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> >
-{
-    static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
-    typedef _Tp type;
+struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, array<_Tp, _Size> > {
+  static_assert(_Ip < _Size, "Index out of bounds in std::tuple_element<> (std::array)");
+  typedef _Tp type;
 };
 
 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-_Tp&
-get(array<_Tp, _Size>& __a) _NOEXCEPT
-{
-    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
-    return __a.__elems_[_Ip];
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp& get(array<_Tp, _Size>& __a) _NOEXCEPT {
+  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array)");
+  return __a.__elems_[_Ip];
 }
 
 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const _Tp&
-get(const array<_Tp, _Size>& __a) _NOEXCEPT
-{
-    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
-    return __a.__elems_[_Ip];
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp& get(const array<_Tp, _Size>& __a) _NOEXCEPT {
+  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array)");
+  return __a.__elems_[_Ip];
 }
 
 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-_Tp&&
-get(array<_Tp, _Size>&& __a) _NOEXCEPT
-{
-    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
-    return _VSTD::move(__a.__elems_[_Ip]);
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp&& get(array<_Tp, _Size>&& __a) _NOEXCEPT {
+  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (std::array &&)");
+  return std::move(__a.__elems_[_Ip]);
 }
 
 template <size_t _Ip, class _Tp, size_t _Size>
-inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX14
-const _Tp&&
-get(const array<_Tp, _Size>&& __a) _NOEXCEPT
-{
-    static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
-    return _VSTD::move(__a.__elems_[_Ip]);
+inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&& get(const array<_Tp, _Size>&& __a) _NOEXCEPT {
+  static_assert(_Ip < _Size, "Index out of bounds in std::get<> (const std::array &&)");
+  return std::move(__a.__elems_[_Ip]);
 }
 
 #if _LIBCPP_STD_VER >= 20
 
 template <typename _Tp, size_t _Size, size_t... _Index>
-_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+_LIBCPP_HIDE_FROM_ABI constexpr array<remove_cv_t<_Tp>, _Size>
 __to_array_lvalue_impl(_Tp (&__arr)[_Size], index_sequence<_Index...>) {
   return {{__arr[_Index]...}};
 }
 
 template <typename _Tp, size_t _Size, size_t... _Index>
-_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
-__to_array_rvalue_impl(_Tp(&&__arr)[_Size], index_sequence<_Index...>) {
-  return {{_VSTD::move(__arr[_Index])...}};
+_LIBCPP_HIDE_FROM_ABI constexpr array<remove_cv_t<_Tp>, _Size>
+__to_array_rvalue_impl(_Tp (&&__arr)[_Size], index_sequence<_Index...>) {
+  return {{std::move(__arr[_Index])...}};
 }
 
 template <typename _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
+_LIBCPP_HIDE_FROM_ABI constexpr array<remove_cv_t<_Tp>, _Size>
 to_array(_Tp (&__arr)[_Size]) noexcept(is_nothrow_constructible_v<_Tp, _Tp&>) {
-  static_assert(
-      !is_array_v<_Tp>,
-      "[array.creation]/1: to_array does not accept multidimensional arrays.");
-  static_assert(
-      is_constructible_v<_Tp, _Tp&>,
-      "[array.creation]/1: to_array requires copy constructible elements.");
-  return _VSTD::__to_array_lvalue_impl(__arr, make_index_sequence<_Size>());
+  static_assert(!is_array_v<_Tp>, "[array.creation]/1: to_array does not accept multidimensional arrays.");
+  static_assert(is_constructible_v<_Tp, _Tp&>, "[array.creation]/1: to_array requires copy constructible elements.");
+  return std::__to_array_lvalue_impl(__arr, make_index_sequence<_Size>());
 }
 
 template <typename _Tp, size_t _Size>
-_LIBCPP_INLINE_VISIBILITY constexpr array<remove_cv_t<_Tp>, _Size>
-to_array(_Tp(&&__arr)[_Size]) noexcept(is_nothrow_move_constructible_v<_Tp>) {
-  static_assert(
-      !is_array_v<_Tp>,
-      "[array.creation]/4: to_array does not accept multidimensional arrays.");
-  static_assert(
-      is_move_constructible_v<_Tp>,
-      "[array.creation]/4: to_array requires move constructible elements.");
-  return _VSTD::__to_array_rvalue_impl(_VSTD::move(__arr),
-                                       make_index_sequence<_Size>());
+_LIBCPP_HIDE_FROM_ABI constexpr array<remove_cv_t<_Tp>, _Size>
+to_array(_Tp (&&__arr)[_Size]) noexcept(is_nothrow_move_constructible_v<_Tp>) {
+  static_assert(!is_array_v<_Tp>, "[array.creation]/4: to_array does not accept multidimensional arrays.");
+  static_assert(is_move_constructible_v<_Tp>, "[array.creation]/4: to_array requires move constructible elements.");
+  return std::__to_array_rvalue_impl(std::move(__arr), make_index_sequence<_Size>());
 }
 
 #endif // _LIBCPP_STD_VER >= 20
 
 _LIBCPP_END_NAMESPACE_STD
 
+_LIBCPP_POP_MACROS
+
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <algorithm>
 #  include <concepts>