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, 62 insertions, 72 deletions

diff --git a/lib/libcxx/include/__iterator/istreambuf_iterator.h b/lib/libcxx/include/__iterator/istreambuf_iterator.h
index e39fec6d72..51c4ecff35 100644
--- a/lib/libcxx/include/__iterator/istreambuf_iterator.h
+++ b/lib/libcxx/include/__iterator/istreambuf_iterator.h
@@ -11,10 +11,11 @@
 #define _LIBCPP___ITERATOR_ISTREAMBUF_ITERATOR_H
 
 #include <__config>
+#include <__fwd/istream.h>
+#include <__fwd/streambuf.h>
 #include <__iterator/default_sentinel.h>
 #include <__iterator/iterator.h>
 #include <__iterator/iterator_traits.h>
-#include <iosfwd> // for forward declaration of basic_streambuf
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -23,95 +24,84 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
-template<class _CharT, class _Traits>
+template <class _CharT, class _Traits>
 class _LIBCPP_TEMPLATE_VIS istreambuf_iterator
 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
-    : public iterator<input_iterator_tag, _CharT,
-                      typename _Traits::off_type, _CharT*,
-                      _CharT>
+    : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT>
 #endif
 {
-_LIBCPP_SUPPRESS_DEPRECATED_POP
+  _LIBCPP_SUPPRESS_DEPRECATED_POP
+
 public:
-    typedef input_iterator_tag              iterator_category;
-    typedef _CharT                          value_type;
-    typedef typename _Traits::off_type      difference_type;
-    typedef _CharT*                         pointer;
-    typedef _CharT                          reference;
-    typedef _CharT                          char_type;
-    typedef _Traits                         traits_type;
-    typedef typename _Traits::int_type      int_type;
-    typedef basic_streambuf<_CharT,_Traits> streambuf_type;
-    typedef basic_istream<_CharT,_Traits>   istream_type;
+  typedef input_iterator_tag iterator_category;
+  typedef _CharT value_type;
+  typedef typename _Traits::off_type difference_type;
+  typedef _CharT* pointer;
+  typedef _CharT reference;
+  typedef _CharT char_type;
+  typedef _Traits traits_type;
+  typedef typename _Traits::int_type int_type;
+  typedef basic_streambuf<_CharT, _Traits> streambuf_type;
+  typedef basic_istream<_CharT, _Traits> istream_type;
+
 private:
-    mutable streambuf_type* __sbuf_;
-
-    class __proxy
-    {
-        char_type __keep_;
-        streambuf_type* __sbuf_;
-        _LIBCPP_INLINE_VISIBILITY
-        explicit __proxy(char_type __c, streambuf_type* __s)
-            : __keep_(__c), __sbuf_(__s) {}
-        friend class istreambuf_iterator;
-    public:
-        _LIBCPP_INLINE_VISIBILITY char_type operator*() const {return __keep_;}
-    };
-
-    _LIBCPP_INLINE_VISIBILITY
-    bool __test_for_eof() const
-    {
-        if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
-            __sbuf_ = nullptr;
-        return __sbuf_ == nullptr;
-    }
+  mutable streambuf_type* __sbuf_;
+
+  class __proxy {
+    char_type __keep_;
+    streambuf_type* __sbuf_;
+    _LIBCPP_HIDE_FROM_ABI explicit __proxy(char_type __c, streambuf_type* __s) : __keep_(__c), __sbuf_(__s) {}
+    friend class istreambuf_iterator;
+
+  public:
+    _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return __keep_; }
+  };
+
+  _LIBCPP_HIDE_FROM_ABI bool __test_for_eof() const {
+    if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sgetc(), traits_type::eof()))
+      __sbuf_ = nullptr;
+    return __sbuf_ == nullptr;
+  }
+
 public:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR istreambuf_iterator() _NOEXCEPT : __sbuf_(nullptr) {}
 #if _LIBCPP_STD_VER >= 20
-    _LIBCPP_INLINE_VISIBILITY constexpr istreambuf_iterator(default_sentinel_t) noexcept
-        : istreambuf_iterator() {}
+  _LIBCPP_HIDE_FROM_ABI constexpr istreambuf_iterator(default_sentinel_t) noexcept : istreambuf_iterator() {}
 #endif // _LIBCPP_STD_VER >= 20
-    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(istream_type& __s) _NOEXCEPT
-        : __sbuf_(__s.rdbuf()) {}
-    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(streambuf_type* __s) _NOEXCEPT
-        : __sbuf_(__s) {}
-    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator(const __proxy& __p) _NOEXCEPT
-        : __sbuf_(__p.__sbuf_) {}
-
-    _LIBCPP_INLINE_VISIBILITY char_type  operator*() const
-        {return static_cast<char_type>(__sbuf_->sgetc());}
-    _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
-        {
-            __sbuf_->sbumpc();
-            return *this;
-        }
-    _LIBCPP_INLINE_VISIBILITY __proxy              operator++(int)
-        {
-            return __proxy(__sbuf_->sbumpc(), __sbuf_);
-        }
-
-    _LIBCPP_INLINE_VISIBILITY bool equal(const istreambuf_iterator& __b) const
-        {return __test_for_eof() == __b.__test_for_eof();}
+  _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(istream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
+  _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
+  _LIBCPP_HIDE_FROM_ABI istreambuf_iterator(const __proxy& __p) _NOEXCEPT : __sbuf_(__p.__sbuf_) {}
+
+  _LIBCPP_HIDE_FROM_ABI char_type operator*() const { return static_cast<char_type>(__sbuf_->sgetc()); }
+  _LIBCPP_HIDE_FROM_ABI istreambuf_iterator& operator++() {
+    __sbuf_->sbumpc();
+    return *this;
+  }
+  _LIBCPP_HIDE_FROM_ABI __proxy operator++(int) { return __proxy(__sbuf_->sbumpc(), __sbuf_); }
+
+  _LIBCPP_HIDE_FROM_ABI bool equal(const istreambuf_iterator& __b) const {
+    return __test_for_eof() == __b.__test_for_eof();
+  }
 
 #if _LIBCPP_STD_VER >= 20
-    friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) {
-      return __i.__test_for_eof();
-    }
+  friend _LIBCPP_HIDE_FROM_ABI bool operator==(const istreambuf_iterator& __i, default_sentinel_t) {
+    return __i.__test_for_eof();
+  }
 #endif // _LIBCPP_STD_VER >= 20
 };
 
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator==(const istreambuf_iterator<_CharT,_Traits>& __a,
-                const istreambuf_iterator<_CharT,_Traits>& __b)
-                {return __a.equal(__b);}
+inline _LIBCPP_HIDE_FROM_ABI bool
+operator==(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
+  return __a.equal(__b);
+}
 
 #if _LIBCPP_STD_VER <= 17
 template <class _CharT, class _Traits>
-inline _LIBCPP_INLINE_VISIBILITY
-bool operator!=(const istreambuf_iterator<_CharT,_Traits>& __a,
-                const istreambuf_iterator<_CharT,_Traits>& __b)
-                {return !__a.equal(__b);}
+inline _LIBCPP_HIDE_FROM_ABI bool
+operator!=(const istreambuf_iterator<_CharT, _Traits>& __a, const istreambuf_iterator<_CharT, _Traits>& __b) {
+  return !__a.equal(__b);
+}
 #endif // _LIBCPP_STD_VER <= 17
 
 _LIBCPP_END_NAMESPACE_STD