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, 148 insertions, 208 deletions

diff --git a/lib/libcxx/include/stack b/lib/libcxx/include/stack
index 437f57d76b..f1f6ee8482 100644
--- a/lib/libcxx/include/stack
+++ b/lib/libcxx/include/stack
@@ -138,269 +138,212 @@ template <class T, class Container>
 #  pragma GCC system_header
 #endif
 
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-template <class _Tp, class _Container = deque<_Tp> > class _LIBCPP_TEMPLATE_VIS stack;
+template <class _Tp, class _Container = deque<_Tp> >
+class _LIBCPP_TEMPLATE_VIS stack;
 
 template <class _Tp, class _Container>
-_LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
+_LIBCPP_HIDE_FROM_ABI bool operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
 
 template <class _Tp, class _Container>
-_LIBCPP_INLINE_VISIBILITY
-bool
-operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
+_LIBCPP_HIDE_FROM_ABI bool operator<(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y);
 
 template <class _Tp, class _Container /*= deque<_Tp>*/>
-class _LIBCPP_TEMPLATE_VIS stack
-{
+class _LIBCPP_TEMPLATE_VIS stack {
 public:
-    typedef _Container                               container_type;
-    typedef typename container_type::value_type      value_type;
-    typedef typename container_type::reference       reference;
-    typedef typename container_type::const_reference const_reference;
-    typedef typename container_type::size_type       size_type;
-    static_assert((is_same<_Tp, value_type>::value), "" );
+  typedef _Container container_type;
+  typedef typename container_type::value_type value_type;
+  typedef typename container_type::reference reference;
+  typedef typename container_type::const_reference const_reference;
+  typedef typename container_type::size_type size_type;
+  static_assert((is_same<_Tp, value_type>::value), "");
 
 protected:
-    container_type c;
+  container_type c;
 
 public:
-    _LIBCPP_INLINE_VISIBILITY
-    stack()
-        _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value)
-        : c() {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    stack(const stack& __q) : c(__q.c) {}
+  _LIBCPP_HIDE_FROM_ABI stack() _NOEXCEPT_(is_nothrow_default_constructible<container_type>::value) : c() {}
 
-    _LIBCPP_INLINE_VISIBILITY
-    stack& operator=(const stack& __q) {c = __q.c; return *this;}
+  _LIBCPP_HIDE_FROM_ABI stack(const stack& __q) : c(__q.c) {}
 
+  _LIBCPP_HIDE_FROM_ABI stack& operator=(const stack& __q) {
+    c = __q.c;
+    return *this;
+  }
 
 #ifndef _LIBCPP_CXX03_LANG
-    _LIBCPP_INLINE_VISIBILITY
-    stack(stack&& __q)
-        _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
-        : c(_VSTD::move(__q.c)) {}
-
-    _LIBCPP_INLINE_VISIBILITY
-    stack& operator=(stack&& __q)
-        _NOEXCEPT_(is_nothrow_move_assignable<container_type>::value)
-        {c = _VSTD::move(__q.c); return *this;}
-
-    _LIBCPP_INLINE_VISIBILITY
-    explicit stack(container_type&& __c) : c(_VSTD::move(__c)) {}
+  _LIBCPP_HIDE_FROM_ABI stack(stack&& __q) _NOEXCEPT_(is_nothrow_move_constructible<container_type>::value)
+      : c(std::move(__q.c)) {}
+
+  _LIBCPP_HIDE_FROM_ABI stack& operator=(stack&& __q) _NOEXCEPT_(is_nothrow_move_assignable<container_type>::value) {
+    c = std::move(__q.c);
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI explicit stack(container_type&& __c) : c(std::move(__c)) {}
 #endif // _LIBCPP_CXX03_LANG
 
-    _LIBCPP_INLINE_VISIBILITY
-    explicit stack(const container_type& __c) : c(__c) {}
-
-    template <class _Alloc>
-        _LIBCPP_INLINE_VISIBILITY
-        explicit stack(const _Alloc& __a,
-                       __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
-            : c(__a) {}
-    template <class _Alloc>
-        _LIBCPP_INLINE_VISIBILITY
-        stack(const container_type& __c, const _Alloc& __a,
-              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
-            : c(__c, __a) {}
-    template <class _Alloc>
-        _LIBCPP_INLINE_VISIBILITY
-        stack(const stack& __s, const _Alloc& __a,
-              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
-            : c(__s.c, __a) {}
+  _LIBCPP_HIDE_FROM_ABI explicit stack(const container_type& __c) : c(__c) {}
+
+  template <class _Alloc>
+  _LIBCPP_HIDE_FROM_ABI explicit stack(const _Alloc& __a,
+                                       __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
+      : c(__a) {}
+  template <class _Alloc>
+  _LIBCPP_HIDE_FROM_ABI
+  stack(const container_type& __c, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
+      : c(__c, __a) {}
+  template <class _Alloc>
+  _LIBCPP_HIDE_FROM_ABI
+  stack(const stack& __s, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
+      : c(__s.c, __a) {}
 #ifndef _LIBCPP_CXX03_LANG
-    template <class _Alloc>
-        _LIBCPP_INLINE_VISIBILITY
-        stack(container_type&& __c, const _Alloc& __a,
-              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
-            : c(_VSTD::move(__c), __a) {}
-    template <class _Alloc>
-        _LIBCPP_INLINE_VISIBILITY
-        stack(stack&& __s, const _Alloc& __a,
-              __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
-            : c(_VSTD::move(__s.c), __a) {}
+  template <class _Alloc>
+  _LIBCPP_HIDE_FROM_ABI
+  stack(container_type&& __c, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
+      : c(std::move(__c), __a) {}
+  template <class _Alloc>
+  _LIBCPP_HIDE_FROM_ABI
+  stack(stack&& __s, const _Alloc& __a, __enable_if_t<uses_allocator<container_type, _Alloc>::value>* = 0)
+      : c(std::move(__s.c), __a) {}
 #endif // _LIBCPP_CXX03_LANG
 
 #if _LIBCPP_STD_VER >= 23
-    template <class _InputIterator,
-              class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
-    _LIBCPP_HIDE_FROM_ABI
-    stack(_InputIterator __first, _InputIterator __last) : c(__first, __last) {}
-
-    template <_ContainerCompatibleRange<_Tp> _Range>
-    _LIBCPP_HIDE_FROM_ABI
-    stack(from_range_t, _Range&& __range) : c(from_range, std::forward<_Range>(__range)) {}
-
-    template <class _InputIterator,
-              class _Alloc,
-              class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
-              class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
-    _LIBCPP_HIDE_FROM_ABI
-    stack(_InputIterator __first, _InputIterator __last, const _Alloc& __alloc) : c(__first, __last, __alloc) {}
-
-    template <_ContainerCompatibleRange<_Tp> _Range,
-              class _Alloc,
-              class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
-    _LIBCPP_HIDE_FROM_ABI
-    stack(from_range_t, _Range&& __range, const _Alloc& __alloc)
-        : c(from_range, std::forward<_Range>(__range), __alloc) {}
+  template <class _InputIterator, class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
+  _LIBCPP_HIDE_FROM_ABI stack(_InputIterator __first, _InputIterator __last) : c(__first, __last) {}
 
-#endif
+  template <_ContainerCompatibleRange<_Tp> _Range>
+  _LIBCPP_HIDE_FROM_ABI stack(from_range_t, _Range&& __range) : c(from_range, std::forward<_Range>(__range)) {}
 
-    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
-    bool empty()     const      {return c.empty();}
-    _LIBCPP_INLINE_VISIBILITY
-    size_type size() const      {return c.size();}
-    _LIBCPP_INLINE_VISIBILITY
-    reference top()             {return c.back();}
-    _LIBCPP_INLINE_VISIBILITY
-    const_reference top() const {return c.back();}
-
-    _LIBCPP_INLINE_VISIBILITY
-    void push(const value_type& __v) {c.push_back(__v);}
-#ifndef _LIBCPP_CXX03_LANG
-    _LIBCPP_INLINE_VISIBILITY
-    void push(value_type&& __v) {c.push_back(_VSTD::move(__v));}
+  template <class _InputIterator,
+            class _Alloc,
+            class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
+            class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
+  _LIBCPP_HIDE_FROM_ABI stack(_InputIterator __first, _InputIterator __last, const _Alloc& __alloc)
+      : c(__first, __last, __alloc) {}
 
-#if _LIBCPP_STD_VER >= 23
-    template <_ContainerCompatibleRange<_Tp> _Range>
-    _LIBCPP_HIDE_FROM_ABI
-    void push_range(_Range&& __range) {
-      if constexpr (requires (container_type& __c) {
-        __c.append_range(std::forward<_Range>(__range));
-      }) {
-        c.append_range(std::forward<_Range>(__range));
-      } else {
-        ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
-      }
-    }
-#endif
+  template <_ContainerCompatibleRange<_Tp> _Range,
+            class _Alloc,
+            class = __enable_if_t<uses_allocator<container_type, _Alloc>::value>>
+  _LIBCPP_HIDE_FROM_ABI stack(from_range_t, _Range&& __range, const _Alloc& __alloc)
+      : c(from_range, std::forward<_Range>(__range), __alloc) {}
 
-    template <class... _Args>
-        _LIBCPP_INLINE_VISIBILITY
-#if _LIBCPP_STD_VER >= 17
-        decltype(auto) emplace(_Args&&... __args)
-        { return c.emplace_back(_VSTD::forward<_Args>(__args)...);}
-#else
-        void      emplace(_Args&&... __args)
-        {        c.emplace_back(_VSTD::forward<_Args>(__args)...);}
 #endif
-#endif // _LIBCPP_CXX03_LANG
 
-    _LIBCPP_INLINE_VISIBILITY
-    void pop() {c.pop_back();}
+  _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_HIDE_FROM_ABI bool empty() const { return c.empty(); }
+  _LIBCPP_HIDE_FROM_ABI size_type size() const { return c.size(); }
+  _LIBCPP_HIDE_FROM_ABI reference top() { return c.back(); }
+  _LIBCPP_HIDE_FROM_ABI const_reference top() const { return c.back(); }
 
-    _LIBCPP_INLINE_VISIBILITY
-    void swap(stack& __s)
-        _NOEXCEPT_(__is_nothrow_swappable<container_type>::value)
-    {
-        using _VSTD::swap;
-        swap(c, __s.c);
+  _LIBCPP_HIDE_FROM_ABI void push(const value_type& __v) { c.push_back(__v); }
+#ifndef _LIBCPP_CXX03_LANG
+  _LIBCPP_HIDE_FROM_ABI void push(value_type&& __v) { c.push_back(std::move(__v)); }
+
+#  if _LIBCPP_STD_VER >= 23
+  template <_ContainerCompatibleRange<_Tp> _Range>
+  _LIBCPP_HIDE_FROM_ABI void push_range(_Range&& __range) {
+    if constexpr (requires(container_type& __c) { __c.append_range(std::forward<_Range>(__range)); }) {
+      c.append_range(std::forward<_Range>(__range));
+    } else {
+      ranges::copy(std::forward<_Range>(__range), std::back_inserter(c));
     }
+  }
+#  endif
+
+  template <class... _Args>
+  _LIBCPP_HIDE_FROM_ABI
+#  if _LIBCPP_STD_VER >= 17
+      decltype(auto)
+      emplace(_Args&&... __args) {
+    return c.emplace_back(std::forward<_Args>(__args)...);
+  }
+#  else
+      void
+      emplace(_Args&&... __args) {
+    c.emplace_back(std::forward<_Args>(__args)...);
+  }
+#  endif
+#endif // _LIBCPP_CXX03_LANG
 
-    _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }
+  _LIBCPP_HIDE_FROM_ABI void pop() { c.pop_back(); }
 
-    template <class _T1, class _OtherContainer>
-    friend
-    bool
-    operator==(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
+  _LIBCPP_HIDE_FROM_ABI void swap(stack& __s) _NOEXCEPT_(__is_nothrow_swappable<container_type>::value) {
+    using std::swap;
+    swap(c, __s.c);
+  }
 
-    template <class _T1, class _OtherContainer>
-    friend
-    bool
-    operator< (const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
+  _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI const _Container& __get_container() const { return c; }
+
+  template <class _T1, class _OtherContainer>
+  friend bool operator==(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
+
+  template <class _T1, class _OtherContainer>
+  friend bool operator<(const stack<_T1, _OtherContainer>& __x, const stack<_T1, _OtherContainer>& __y);
 };
 
 #if _LIBCPP_STD_VER >= 17
-template<class _Container,
-         class = enable_if_t<!__is_allocator<_Container>::value>
->
-stack(_Container)
-    -> stack<typename _Container::value_type, _Container>;
-
-template<class _Container,
-         class _Alloc,
-         class = enable_if_t<!__is_allocator<_Container>::value>,
-         class = enable_if_t<uses_allocator<_Container, _Alloc>::value>
-         >
-stack(_Container, _Alloc)
-    -> stack<typename _Container::value_type, _Container>;
+template <class _Container, class = enable_if_t<!__is_allocator<_Container>::value> >
+stack(_Container) -> stack<typename _Container::value_type, _Container>;
+
+template <class _Container,
+          class _Alloc,
+          class = enable_if_t<!__is_allocator<_Container>::value>,
+          class = enable_if_t<uses_allocator<_Container, _Alloc>::value> >
+stack(_Container, _Alloc) -> stack<typename _Container::value_type, _Container>;
 #endif
 
 #if _LIBCPP_STD_VER >= 23
-template<class _InputIterator,
-         class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
-stack(_InputIterator, _InputIterator)
-    -> stack<__iter_value_type<_InputIterator>>;
+template <class _InputIterator, class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>>
+stack(_InputIterator, _InputIterator) -> stack<__iter_value_type<_InputIterator>>;
 
 template <ranges::input_range _Range>
 stack(from_range_t, _Range&&) -> stack<ranges::range_value_t<_Range>>;
 
-template<class _InputIterator,
-         class _Alloc,
-         class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
-         class = __enable_if_t<__is_allocator<_Alloc>::value>>
+template <class _InputIterator,
+          class _Alloc,
+          class = __enable_if_t<__has_input_iterator_category<_InputIterator>::value>,
+          class = __enable_if_t<__is_allocator<_Alloc>::value>>
 stack(_InputIterator, _InputIterator, _Alloc)
     -> stack<__iter_value_type<_InputIterator>, deque<__iter_value_type<_InputIterator>, _Alloc>>;
 
-template <ranges::input_range _Range,
-          class _Alloc,
-          class = __enable_if_t<__is_allocator<_Alloc>::value>>
+template <ranges::input_range _Range, class _Alloc, class = __enable_if_t<__is_allocator<_Alloc>::value>>
 stack(from_range_t, _Range&&, _Alloc)
-  -> stack<ranges::range_value_t<_Range>, deque<ranges::range_value_t<_Range>, _Alloc>>;
+    -> stack<ranges::range_value_t<_Range>, deque<ranges::range_value_t<_Range>, _Alloc>>;
 
 #endif
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return __x.c == __y.c;
+inline _LIBCPP_HIDE_FROM_ABI bool operator==(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return __x.c == __y.c;
 }
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator< (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return __x.c < __y.c;
+inline _LIBCPP_HIDE_FROM_ABI bool operator<(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return __x.c < __y.c;
 }
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return !(__x == __y);
+inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return !(__x == __y);
 }
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator> (const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return __y < __x;
+inline _LIBCPP_HIDE_FROM_ABI bool operator>(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return __y < __x;
 }
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return !(__x < __y);
+inline _LIBCPP_HIDE_FROM_ABI bool operator>=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return !(__x < __y);
 }
 
 template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-bool
-operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
-{
-    return !(__y < __x);
+inline _LIBCPP_HIDE_FROM_ABI bool operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
+  return !(__y < __x);
 }
 
 #if _LIBCPP_STD_VER >= 20
@@ -408,29 +351,26 @@ operator<=(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y)
 template <class _Tp, three_way_comparable _Container>
 _LIBCPP_HIDE_FROM_ABI compare_three_way_result_t<_Container>
 operator<=>(const stack<_Tp, _Container>& __x, const stack<_Tp, _Container>& __y) {
-    // clang 16 bug: declaring `friend operator<=>` causes "use of overloaded operator '*' is ambiguous" errors
-    return __x.__get_container() <=> __y.__get_container();
+  // clang 16 bug: declaring `friend operator<=>` causes "use of overloaded operator '*' is ambiguous" errors
+  return __x.__get_container() <=> __y.__get_container();
 }
 
 #endif
 
-template <class _Tp, class _Container>
-inline _LIBCPP_INLINE_VISIBILITY
-__enable_if_t<__is_swappable<_Container>::value, void>
-swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
-    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
-{
-    __x.swap(__y);
+template <class _Tp, class _Container, __enable_if_t<__is_swappable<_Container>::value, int> = 0>
+inline _LIBCPP_HIDE_FROM_ABI void swap(stack<_Tp, _Container>& __x, stack<_Tp, _Container>& __y)
+    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) {
+  __x.swap(__y);
 }
 
 template <class _Tp, class _Container, class _Alloc>
-struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc>
-    : public uses_allocator<_Container, _Alloc>
-{
+struct _LIBCPP_TEMPLATE_VIS uses_allocator<stack<_Tp, _Container>, _Alloc> : public uses_allocator<_Container, _Alloc> {
 };
 
 _LIBCPP_END_NAMESPACE_STD
 
+_LIBCPP_POP_MACROS
+
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <concepts>
 #  include <functional>