Merge branch 'master' into devel/sphinx

21 files changed, 1147 insertions, 97 deletions

diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index dac7765..be3e12a 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -103,7 +103,6 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/multi.m4 \
 	$(top_srcdir)/../config/no-executables.m4 \
 	$(top_srcdir)/../config/override.m4 \
-	$(top_srcdir)/../config/stdint.m4 \
 	$(top_srcdir)/../config/toolexeclibdir.m4 \
 	$(top_srcdir)/../config/unwind_ipinfo.m4 \
 	$(top_srcdir)/../libtool.m4 $(top_srcdir)/../ltoptions.m4 \
diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h
index 76ed740..bd1ed56 100644
--- a/libstdc++-v3/include/bits/atomic_wait.h
+++ b/libstdc++-v3/include/bits/atomic_wait.h
@@ -58,14 +58,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #ifdef _GLIBCXX_HAVE_LINUX_FUTEX
 #define _GLIBCXX_HAVE_PLATFORM_WAIT 1
     using __platform_wait_t = int;
-    static constexpr size_t __platform_wait_alignment = 4;
+    inline constexpr size_t __platform_wait_alignment = 4;
 #else
 // define _GLIBCX_HAVE_PLATFORM_WAIT and implement __platform_wait()
 // and __platform_notify() if there is a more efficient primitive supported
 // by the platform (e.g. __ulock_wait()/__ulock_wake()) which is better than
 // a mutex/condvar based wait.
     using __platform_wait_t = uint64_t;
-    static constexpr size_t __platform_wait_alignment
+    inline constexpr size_t __platform_wait_alignment
       = __alignof__(__platform_wait_t);
 #endif
   } // namespace __detail
@@ -142,8 +142,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #endif
     }
 
-    constexpr auto __atomic_spin_count_relax = 12;
-    constexpr auto __atomic_spin_count = 16;
+    inline constexpr auto __atomic_spin_count_relax = 12;
+    inline constexpr auto __atomic_spin_count = 16;
 
     struct __default_spin_policy
     {
diff --git a/libstdc++-v3/include/bits/cpp_type_traits.h b/libstdc++-v3/include/bits/cpp_type_traits.h
index 8f91bbe..592673a 100644
--- a/libstdc++-v3/include/bits/cpp_type_traits.h
+++ b/libstdc++-v3/include/bits/cpp_type_traits.h
@@ -315,6 +315,51 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
       typedef __true_type __type;
     };
 
+#ifdef __STDCPP_FLOAT16_T__
+  template<>
+    struct __is_floating<_Float16>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif
+
+#ifdef __STDCPP_FLOAT32_T__
+  template<>
+    struct __is_floating<_Float32>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif
+
+#ifdef __STDCPP_FLOAT64_T__
+  template<>
+    struct __is_floating<_Float64>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif
+
+#ifdef __STDCPP_FLOAT128_T__
+  template<>
+    struct __is_floating<_Float128>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif
+
+#ifdef __STDCPP_BFLOAT16_T__
+  template<>
+    struct __is_floating<__gnu_cxx::__bfloat16_t>
+    {
+      enum { __value = 1 };
+      typedef __true_type __type;
+    };
+#endif
+
   //
   // Pointer types
   //
diff --git a/libstdc++-v3/include/bits/fs_path.h b/libstdc++-v3/include/bits/fs_path.h
index 6e7b366..2fc7dcd 100644
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -1262,9 +1262,9 @@ namespace __detail
       {
 	if (_M_pathname.back() == preferred_separator)
 	  return {};
-	auto& __last = *--end();
-	if (__last._M_type() == _Type::_Filename)
-	  return __last;
+	auto __last = --end();
+	if (__last->_M_type() == _Type::_Filename)
+	  return *__last;
       }
     return {};
   }
diff --git a/libstdc++-v3/include/bits/ranges_algobase.h b/libstdc++-v3/include/bits/ranges_algobase.h
index f6f0b9c..443ad52 100644
--- a/libstdc++-v3/include/bits/ranges_algobase.h
+++ b/libstdc++-v3/include/bits/ranges_algobase.h
@@ -239,7 +239,7 @@ namespace ranges
 	{
 	  auto [__in,__out]
 	    = ranges::__copy_or_move<_IsMove>(__first.base(), __last.base(),
-					      __result);
+					      std::move(__result));
 	  return {decltype(__first){__in}, std::move(__out)};
 	}
       else if constexpr (__is_normal_iterator<_Out>)
diff --git a/libstdc++-v3/include/bits/regex_automaton.h b/libstdc++-v3/include/bits/regex_automaton.h
index f95eb7d..44bde42 100644
--- a/libstdc++-v3/include/bits/regex_automaton.h
+++ b/libstdc++-v3/include/bits/regex_automaton.h
@@ -46,7 +46,7 @@ namespace __detail
    */
 
   typedef long _StateIdT;
-  static const _StateIdT _S_invalid_state_id  = -1;
+  _GLIBCXX17_INLINE constexpr _StateIdT _S_invalid_state_id  = -1;
 
   template<typename _CharT>
     using _Matcher = std::function<bool (_CharT)>;
diff --git a/libstdc++-v3/include/bits/regex_error.h b/libstdc++-v3/include/bits/regex_error.h
index 74a1428..ab20765 100644
--- a/libstdc++-v3/include/bits/regex_error.h
+++ b/libstdc++-v3/include/bits/regex_error.h
@@ -66,60 +66,60 @@ namespace regex_constants
     };
 
   /** The expression contained an invalid collating element name. */
-  constexpr error_type error_collate(_S_error_collate);
+  _GLIBCXX17_INLINE constexpr error_type error_collate(_S_error_collate);
 
   /** The expression contained an invalid character class name. */
-  constexpr error_type error_ctype(_S_error_ctype);
+  _GLIBCXX17_INLINE constexpr error_type error_ctype(_S_error_ctype);
 
   /**
    * The expression contained an invalid escaped character, or a trailing
    * escape.
    */
-  constexpr error_type error_escape(_S_error_escape);
+  _GLIBCXX17_INLINE constexpr error_type error_escape(_S_error_escape);
 
   /** The expression contained an invalid back reference. */
-  constexpr error_type error_backref(_S_error_backref);
+  _GLIBCXX17_INLINE constexpr error_type error_backref(_S_error_backref);
 
   /** The expression contained mismatched [ and ]. */
-  constexpr error_type error_brack(_S_error_brack);
+  _GLIBCXX17_INLINE constexpr error_type error_brack(_S_error_brack);
 
   /** The expression contained mismatched ( and ). */
-  constexpr error_type error_paren(_S_error_paren);
+  _GLIBCXX17_INLINE constexpr error_type error_paren(_S_error_paren);
 
   /** The expression contained mismatched { and } */
-  constexpr error_type error_brace(_S_error_brace);
+  _GLIBCXX17_INLINE constexpr error_type error_brace(_S_error_brace);
 
   /** The expression contained an invalid range in a {} expression. */
-  constexpr error_type error_badbrace(_S_error_badbrace);
+  _GLIBCXX17_INLINE constexpr error_type error_badbrace(_S_error_badbrace);
 
   /**
    * The expression contained an invalid character range,
    * such as [b-a] in most encodings.
    */
-  constexpr error_type error_range(_S_error_range);
+  _GLIBCXX17_INLINE constexpr error_type error_range(_S_error_range);
 
   /**
    * There was insufficient memory to convert the expression into a
    * finite state machine.
    */
-  constexpr error_type error_space(_S_error_space);
+  _GLIBCXX17_INLINE constexpr error_type error_space(_S_error_space);
 
   /**
    * One of <em>*?+{</em> was not preceded by a valid regular expression.
    */
-  constexpr error_type error_badrepeat(_S_error_badrepeat);
+  _GLIBCXX17_INLINE constexpr error_type error_badrepeat(_S_error_badrepeat);
 
   /**
    * The complexity of an attempted match against a regular expression
    * exceeded a pre-set level.
    */
-  constexpr error_type error_complexity(_S_error_complexity);
+  _GLIBCXX17_INLINE constexpr error_type error_complexity(_S_error_complexity);
 
   /**
    * There was insufficient memory to determine whether the
    * regular expression could match the specified character sequence.
    */
-  constexpr error_type error_stack(_S_error_stack);
+  _GLIBCXX17_INLINE constexpr error_type error_stack(_S_error_stack);
 
   ///@}
 } // namespace regex_constants
diff --git a/libstdc++-v3/include/bits/regex_executor.h b/libstdc++-v3/include/bits/regex_executor.h
index dc0878c..cdafcd5 100644
--- a/libstdc++-v3/include/bits/regex_executor.h
+++ b/libstdc++-v3/include/bits/regex_executor.h
@@ -71,14 +71,15 @@ namespace __detail
 		_ResultsVec&    __results,
 		const _RegexT&  __re,
 		_FlagT          __flags)
-      : _M_begin(__begin),
-      _M_end(__end),
-      _M_re(__re),
-      _M_nfa(*__re._M_automaton),
-      _M_results(__results),
-      _M_rep_count(_M_nfa.size()),
-      _M_states(_M_nfa._M_start(), _M_nfa.size()),
-      _M_flags(__flags)
+      : _M_cur_results(__results.get_allocator()),
+	_M_begin(__begin),
+	_M_end(__end),
+	_M_re(__re),
+	_M_nfa(*__re._M_automaton),
+	_M_results(__results),
+	_M_rep_count(_M_nfa.size()),
+	_M_states(_M_nfa._M_start(), _M_nfa.size()),
+	_M_flags(__flags)
       {
 	using namespace regex_constants;
 	if (__flags & match_prev_avail) // ignore not_bol and not_bow
diff --git a/libstdc++-v3/include/bits/regex_executor.tcc b/libstdc++-v3/include/bits/regex_executor.tcc
index b93e958..a5885ed 100644
--- a/libstdc++-v3/include/bits/regex_executor.tcc
+++ b/libstdc++-v3/include/bits/regex_executor.tcc
@@ -124,9 +124,10 @@ namespace __detail
 	    break;
 	  std::fill_n(_M_states._M_visited_states, _M_nfa.size(), false);
 	  auto __old_queue = std::move(_M_states._M_match_queue);
+	  auto __alloc = _M_cur_results.get_allocator();
 	  for (auto& __task : __old_queue)
 	    {
-	      _M_cur_results = std::move(__task.second);
+	      _M_cur_results = _ResultsVec(std::move(__task.second), __alloc);
 	      _M_dfs(__match_mode, __task.first);
 	    }
 	  if (__match_mode == _Match_mode::_Prefix)
diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
index 555d644..e52055a 100644
--- a/libstdc++-v3/include/c_global/cmath
+++ b/libstdc++-v3/include/c_global/cmath
@@ -2755,9 +2755,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   nearbyint(_Float16 __x)
   { return _Float16(__builtin_nearbyintf(__x)); }
 
-  inline _Float16
+  constexpr _Float16
   nextafter(_Float16 __x, _Float16 __y)
   {
+    if (std::__is_constant_evaluated())
+      return __builtin_nextafterf16(__x, __y);
 #ifdef __INT16_TYPE__
     using __float16_int_type = __INT16_TYPE__;
 #else
@@ -3471,9 +3473,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   nearbyint(__gnu_cxx::__bfloat16_t __x)
   { return __gnu_cxx::__bfloat16_t(__builtin_nearbyintf(__x)); }
 
-  inline __gnu_cxx::__bfloat16_t
+  constexpr __gnu_cxx::__bfloat16_t
   nextafter(__gnu_cxx::__bfloat16_t __x, __gnu_cxx::__bfloat16_t __y)
   {
+    if (std::__is_constant_evaluated())
+      return __builtin_nextafterf16b(__x, __y);
 #ifdef __INT16_TYPE__
     using __bfloat16_int_type = __INT16_TYPE__;
 #else
diff --git a/libstdc++-v3/include/experimental/propagate_const b/libstdc++-v3/include/experimental/propagate_const
index 258ef6f..12b0f27 100644
--- a/libstdc++-v3/include/experimental/propagate_const
+++ b/libstdc++-v3/include/experimental/propagate_const
@@ -50,6 +50,48 @@ namespace experimental
 {
 inline namespace fundamentals_v2
 {
+  template<typename _Tp>
+    using __propagate_const_elem_type
+      = remove_reference_t<decltype(*std::declval<_Tp&>())>;
+
+  template<typename _Tp,
+	   typename _Elem = __propagate_const_elem_type<_Tp>,
+	   bool = is_convertible<const _Tp, const _Elem*>::value>
+    struct __propagate_const_conversion_c
+    { };
+
+  template<typename _Tp, typename _Elem>
+    struct __propagate_const_conversion_c<_Tp, _Elem, true>
+    {
+      constexpr operator const _Elem*() const;
+    };
+
+  template<typename _Tp,
+	   typename _Elem = __propagate_const_elem_type<_Tp>,
+	   bool = is_convertible<_Tp, _Elem*>::value>
+    struct __propagate_const_conversion_nc
+    { };
+
+  template<typename _Tp, typename _Elem>
+    struct __propagate_const_conversion_nc<_Tp, _Elem, true>
+    {
+      constexpr operator _Elem*();
+    };
+
+  // Base class of propagate_const<T> when T is a class type.
+  template <typename _Tp>
+    struct __propagate_const_conversions
+    : __propagate_const_conversion_c<_Tp>, __propagate_const_conversion_nc<_Tp>
+    { };
+
+  // Base class of propagate_const<T> when T is a pointer type.
+  template<typename _Tp>
+    struct __propagate_const_conversions<_Tp*>
+    {
+      constexpr operator const _Tp*() const noexcept;
+      constexpr operator _Tp*() noexcept;
+    };
+
   /**
    * @defgroup propagate_const Const-propagating wrapper
    * @ingroup libfund-ts
@@ -63,10 +105,10 @@ inline namespace fundamentals_v2
 
   /// Const-propagating wrapper.
   template <typename _Tp>
-    class propagate_const
+    class propagate_const : public __propagate_const_conversions<_Tp>
     {
     public:
-      typedef remove_reference_t<decltype(*std::declval<_Tp&>())> element_type;
+      using element_type = __propagate_const_elem_type<_Tp>;
 
     private:
       template <typename _Up>
@@ -186,16 +228,6 @@ inline namespace fundamentals_v2
 	return get();
       }
 
-      template <typename _Up = _Tp,
-		typename enable_if<__or_<is_pointer<_Up>,
-					 is_convertible<_Up,
-							const element_type*>
-					 >::value, bool>::type = true>
-      constexpr operator const element_type*() const
-      {
-	return get();
-      }
-
       constexpr const element_type& operator*() const
       {
 	return *get();
@@ -212,16 +244,6 @@ inline namespace fundamentals_v2
 	return get();
       }
 
-      template <typename _Up = _Tp,
-		typename enable_if<__or_<is_pointer<_Up>,
-					 is_convertible<_Up,
-						        const element_type*>
-					 >::value, bool>::type = true>
-      constexpr operator element_type*()
-      {
-	return get();
-      }
-
       constexpr element_type& operator*()
       {
 	return *get();
@@ -430,6 +452,28 @@ inline namespace fundamentals_v2
       return __pt._M_t;
     }
 
+  template<typename _Tp>
+    constexpr
+    __propagate_const_conversions<_Tp*>::operator const _Tp*() const noexcept
+    { return static_cast<const propagate_const<_Tp*>*>(this)->get(); }
+
+  template<typename _Tp>
+    constexpr
+    __propagate_const_conversions<_Tp*>::operator _Tp*() noexcept
+    { return static_cast<propagate_const<_Tp*>*>(this)->get(); }
+
+  template<typename _Tp, typename _Elem>
+    constexpr
+    __propagate_const_conversion_c<_Tp, _Elem, true>::
+    operator const _Elem*() const
+    { return static_cast<const propagate_const<_Tp>*>(this)->get(); }
+
+  template<typename _Tp, typename _Elem>
+    constexpr
+    __propagate_const_conversion_nc<_Tp, _Elem, true>::
+    operator _Elem*()
+    { return static_cast<propagate_const<_Tp>*>(this)->get(); }
+
   /// @} group propagate_const
 } // namespace fundamentals_v2
 } // namespace experimental
diff --git a/libstdc++-v3/include/ext/concurrence.h b/libstdc++-v3/include/ext/concurrence.h
index aea861b..7fd8149 100644
--- a/libstdc++-v3/include/ext/concurrence.h
+++ b/libstdc++-v3/include/ext/concurrence.h
@@ -50,7 +50,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   // Compile time constant that indicates prefered locking policy in
   // the current configuration.
-  static const _Lock_policy __default_lock_policy = 
+  _GLIBCXX17_INLINE const _Lock_policy __default_lock_policy =
 #ifndef __GTHREADS
   _S_single;
 #elif defined _GLIBCXX_HAVE_ATOMIC_LOCK_POLICY
diff --git a/libstdc++-v3/include/pstl/execution_defs.h b/libstdc++-v3/include/pstl/execution_defs.h
index 13b0029..3eca558 100644
--- a/libstdc++-v3/include/pstl/execution_defs.h
+++ b/libstdc++-v3/include/pstl/execution_defs.h
@@ -107,10 +107,10 @@ class unsequenced_policy
 };
 
 // 2.8, Execution policy objects
-constexpr sequenced_policy seq{};
-constexpr parallel_policy par{};
-constexpr parallel_unsequenced_policy par_unseq{};
-constexpr unsequenced_policy unseq{};
+_GLIBCXX17_INLINE constexpr sequenced_policy seq{};
+_GLIBCXX17_INLINE constexpr parallel_policy par{};
+_GLIBCXX17_INLINE constexpr parallel_unsequenced_policy par_unseq{};
+_GLIBCXX17_INLINE constexpr unsequenced_policy unseq{};
 
 // 2.3, Execution policy type trait
 template <class _Tp>
diff --git a/libstdc++-v3/include/std/charconv b/libstdc++-v3/include/std/charconv
index a65fbed..e9bf953 100644
--- a/libstdc++-v3/include/std/charconv
+++ b/libstdc++-v3/include/std/charconv
@@ -672,6 +672,87 @@ namespace __detail
   from_chars_result
   from_chars(const char* __first, const char* __last, long double& __value,
 	     chars_format __fmt = chars_format::general) noexcept;
+
+  // Library routines for 16-bit extended floating point formats
+  // using float as interchange format.
+  from_chars_result
+  __from_chars_float16_t(const char* __first, const char* __last,
+			 float& __value,
+			 chars_format __fmt = chars_format::general) noexcept;
+  from_chars_result
+  __from_chars_bfloat16_t(const char* __first, const char* __last,
+			  float& __value,
+			  chars_format __fmt = chars_format::general) noexcept;
+
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32) \
+    && defined(__cpp_lib_to_chars)
+  inline from_chars_result
+  from_chars(const char* __first, const char* __last, _Float16& __value,
+	     chars_format __fmt = chars_format::general) noexcept
+  {
+    float __val;
+    from_chars_result __res
+      = __from_chars_float16_t(__first, __last, __val, __fmt);
+    if (__res.ec == errc{})
+      __value = __val;
+    return __res;
+  }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline from_chars_result
+  from_chars(const char* __first, const char* __last, _Float32& __value,
+	     chars_format __fmt = chars_format::general) noexcept
+  {
+    float __val;
+    from_chars_result __res = from_chars(__first, __last, __val, __fmt);
+    if (__res.ec == errc{})
+      __value = __val;
+    return __res;
+  }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+  inline from_chars_result
+  from_chars(const char* __first, const char* __last, _Float64& __value,
+	     chars_format __fmt = chars_format::general) noexcept
+  {
+    double __val;
+    from_chars_result __res = from_chars(__first, __last, __val, __fmt);
+    if (__res.ec == errc{})
+      __value = __val;
+    return __res;
+  }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+  inline from_chars_result
+  from_chars(const char* __first, const char* __last, _Float128& __value,
+	     chars_format __fmt = chars_format::general) noexcept
+  {
+    long double __val;
+    from_chars_result __res = from_chars(__first, __last, __val, __fmt);
+    if (__res.ec == errc{})
+      __value = __val;
+    return __res;
+  }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32) \
+    && defined(__cpp_lib_to_chars)
+  inline from_chars_result
+  from_chars(const char* __first, const char* __last,
+	     __gnu_cxx::__bfloat16_t & __value,
+	     chars_format __fmt = chars_format::general) noexcept
+  {
+    float __val;
+    from_chars_result __res
+      = __from_chars_bfloat16_t(__first, __last, __val, __fmt);
+    if (__res.ec == errc{})
+      __value = __val;
+    return __res;
+  }
+#endif
 #endif
 
 #if defined __cpp_lib_to_chars
@@ -698,6 +779,97 @@ namespace __detail
 			   chars_format __fmt) noexcept;
   to_chars_result to_chars(char* __first, char* __last, long double __value,
 			   chars_format __fmt, int __precision) noexcept;
+
+  // Library routines for 16-bit extended floating point formats
+  // using float as interchange format.
+  to_chars_result __to_chars_float16_t(char* __first, char* __last,
+				       float __value,
+				       chars_format __fmt) noexcept;
+  to_chars_result __to_chars_bfloat16_t(char* __first, char* __last,
+					float __value,
+					chars_format __fmt) noexcept;
+
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float16 __value) noexcept
+  {
+    return __to_chars_float16_t(__first, __last, float(__value),
+				chars_format{});
+  }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float16 __value,
+	   chars_format __fmt) noexcept
+  { return __to_chars_float16_t(__first, __last, float(__value), __fmt); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float16 __value,
+	   chars_format __fmt, int __precision) noexcept
+  { return to_chars(__first, __last, float(__value), __fmt, __precision); }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float32 __value) noexcept
+  { return to_chars(__first, __last, float(__value)); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float32 __value,
+	   chars_format __fmt) noexcept
+  { return to_chars(__first, __last, float(__value), __fmt); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float32 __value,
+	   chars_format __fmt, int __precision) noexcept
+  { return to_chars(__first, __last, float(__value), __fmt, __precision); }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float64 __value) noexcept
+  { return to_chars(__first, __last, double(__value)); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float64 __value,
+	   chars_format __fmt) noexcept
+  { return to_chars(__first, __last, double(__value), __fmt); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float64 __value,
+	   chars_format __fmt, int __precision) noexcept
+  { return to_chars(__first, __last, double(__value), __fmt, __precision); }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float128 __value) noexcept
+  { return to_chars(__first, __last, static_cast<long double>(__value)); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float128 __value,
+	   chars_format __fmt) noexcept
+  {
+    return to_chars(__first, __last, static_cast<long double>(__value), __fmt);
+  }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, _Float128 __value,
+	   chars_format __fmt, int __precision) noexcept
+  {
+    return to_chars(__first, __last, static_cast<long double>(__value), __fmt,
+		    __precision);
+  }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline to_chars_result
+  to_chars(char* __first, char* __last,
+	   __gnu_cxx::__bfloat16_t __value) noexcept
+  {
+    return __to_chars_bfloat16_t(__first, __last, float(__value),
+				 chars_format{});
+  }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, __gnu_cxx::__bfloat16_t __value,
+	   chars_format __fmt) noexcept
+  { return __to_chars_bfloat16_t(__first, __last, float(__value), __fmt); }
+  inline to_chars_result
+  to_chars(char* __first, char* __last, __gnu_cxx::__bfloat16_t __value,
+	   chars_format __fmt, int __precision) noexcept
+  { return to_chars(__first, __last, float(__value), __fmt, __precision); }
+#endif
 #endif
 
 _GLIBCXX_END_NAMESPACE_VERSION
diff --git a/libstdc++-v3/include/std/complex b/libstdc++-v3/include/std/complex
index 8f9368f..da2df91 100644
--- a/libstdc++-v3/include/std/complex
+++ b/libstdc++-v3/include/std/complex
@@ -142,8 +142,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       ///  Converting constructor.
       template<typename _Up>
-        _GLIBCXX_CONSTEXPR complex(const complex<_Up>& __z)
-	: _M_real(__z.real()), _M_imag(__z.imag()) { }
+#if __cplusplus > 202002L
+	explicit(!requires(_Up __u) { _Tp{__u}; })
+#endif
+	_GLIBCXX_CONSTEXPR complex(const complex<_Up>& __z)
+	: _M_real(_Tp(__z.real())), _M_imag(_Tp(__z.imag())) { }
 
 #if __cplusplus >= 201103L
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
@@ -1077,6 +1080,264 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	                 : std::pow(complex<_Tp>(__x), __y);
     }
 
+#if _GLIBCXX_USE_C99_COMPLEX
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline _Float16
+  __complex_abs(__complex__ _Float16 __z)
+  { return _Float16(__builtin_cabsf(__z)); }
+
+  inline _Float16
+  __complex_arg(__complex__ _Float16 __z)
+  { return _Float16(__builtin_cargf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_cos(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_ccosf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_cosh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_ccoshf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_exp(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_cexpf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_log(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_clogf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_sin(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_csinf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_sinh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_csinhf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_sqrt(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_csqrtf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_tan(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_ctanf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_tanh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_ctanhf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_pow(__complex__ _Float16 __x, __complex__ _Float16 __y)
+  { return static_cast<__complex__ _Float16>(__builtin_cpowf(__x, __y)); }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline _Float32
+  __complex_abs(__complex__ _Float32 __z) { return __builtin_cabsf(__z); }
+
+  inline _Float32
+  __complex_arg(__complex__ _Float32 __z) { return __builtin_cargf(__z); }
+
+  inline __complex__ _Float32
+  __complex_cos(__complex__ _Float32 __z) { return __builtin_ccosf(__z); }
+
+  inline __complex__ _Float32
+  __complex_cosh(__complex__ _Float32 __z) { return __builtin_ccoshf(__z); }
+
+  inline __complex__ _Float32
+  __complex_exp(__complex__ _Float32 __z) { return __builtin_cexpf(__z); }
+
+  inline __complex__ _Float32
+  __complex_log(__complex__ _Float32 __z) { return __builtin_clogf(__z); }
+
+  inline __complex__ _Float32
+  __complex_sin(__complex__ _Float32 __z) { return __builtin_csinf(__z); }
+
+  inline __complex__ _Float32
+  __complex_sinh(__complex__ _Float32 __z) { return __builtin_csinhf(__z); }
+
+  inline __complex__ _Float32
+  __complex_sqrt(__complex__ _Float32 __z) { return __builtin_csqrtf(__z); }
+
+  inline __complex__ _Float32
+  __complex_tan(__complex__ _Float32 __z) { return __builtin_ctanf(__z); }
+
+  inline __complex__ _Float32
+  __complex_tanh(__complex__ _Float32 __z) { return __builtin_ctanhf(__z); }
+
+  inline __complex__ _Float32
+  __complex_pow(__complex__ _Float32 __x, __complex__ _Float32 __y)
+  { return __builtin_cpowf(__x, __y); }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+  inline _Float64
+  __complex_abs(__complex__ _Float64 __z) { return __builtin_cabs(__z); }
+
+  inline _Float64
+  __complex_arg(__complex__ _Float64 __z) { return __builtin_carg(__z); }
+
+  inline __complex__ _Float64
+  __complex_cos(__complex__ _Float64 __z) { return __builtin_ccos(__z); }
+
+  inline __complex__ _Float64
+  __complex_cosh(__complex__ _Float64 __z) { return __builtin_ccosh(__z); }
+
+  inline __complex__ _Float64
+  __complex_exp(__complex__ _Float64 __z) { return __builtin_cexp(__z); }
+
+  inline __complex__ _Float64
+  __complex_log(__complex__ _Float64 __z) { return __builtin_clog(__z); }
+
+  inline __complex__ _Float64
+  __complex_sin(__complex__ _Float64 __z) { return __builtin_csin(__z); }
+
+  inline __complex__ _Float64
+  __complex_sinh(__complex__ _Float64 __z) { return __builtin_csinh(__z); }
+
+  inline __complex__ _Float64
+  __complex_sqrt(__complex__ _Float64 __z) { return __builtin_csqrt(__z); }
+
+  inline __complex__ _Float64
+  __complex_tan(__complex__ _Float64 __z) { return __builtin_ctan(__z); }
+
+  inline __complex__ _Float64
+  __complex_tanh(__complex__ _Float64 __z) { return __builtin_ctanh(__z); }
+
+  inline __complex__ _Float64
+  __complex_pow(__complex__ _Float64 __x, __complex__ _Float64 __y)
+  { return __builtin_cpow(__x, __y); }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+  inline _Float128
+  __complex_abs(__complex__ _Float128 __z) { return __builtin_cabsl(__z); }
+
+  inline _Float128
+  __complex_arg(__complex__ _Float128 __z) { return __builtin_cargl(__z); }
+
+  inline __complex__ _Float128
+  __complex_cos(__complex__ _Float128 __z) { return __builtin_ccosl(__z); }
+
+  inline __complex__ _Float128
+  __complex_cosh(__complex__ _Float128 __z) { return __builtin_ccoshl(__z); }
+
+  inline __complex__ _Float128
+  __complex_exp(__complex__ _Float128 __z) { return __builtin_cexpl(__z); }
+
+  inline __complex__ _Float128
+  __complex_log(__complex__ _Float128 __z) { return __builtin_clogl(__z); }
+
+  inline __complex__ _Float128
+  __complex_sin(__complex__ _Float128 __z) { return __builtin_csinl(__z); }
+
+  inline __complex__ _Float128
+  __complex_sinh(__complex__ _Float128 __z) { return __builtin_csinhl(__z); }
+
+  inline __complex__ _Float128
+  __complex_sqrt(__complex__ _Float128 __z) { return __builtin_csqrtl(__z); }
+
+  inline __complex__ _Float128
+  __complex_tan(__complex__ _Float128 __z) { return __builtin_ctanl(__z); }
+
+  inline __complex__ _Float128
+  __complex_tanh(__complex__ _Float128 __z) { return __builtin_ctanhl(__z); }
+
+  inline __complex__ _Float128
+  __complex_pow(__complex__ _Float128 __x, __complex__ _Float128 __y)
+  { return __builtin_cpowl(__x, __y); }
+#elif defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
+  inline _Float128
+  __complex_abs(__complex__ _Float128 __z) { return __builtin_cabsf128(__z); }
+
+  inline _Float128
+  __complex_arg(__complex__ _Float128 __z) { return __builtin_cargf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_cos(__complex__ _Float128 __z) { return __builtin_ccosf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_cosh(__complex__ _Float128 __z) { return __builtin_ccoshf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_exp(__complex__ _Float128 __z) { return __builtin_cexpf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_log(__complex__ _Float128 __z) { return __builtin_clogf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_sin(__complex__ _Float128 __z) { return __builtin_csinf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_sinh(__complex__ _Float128 __z) { return __builtin_csinhf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_sqrt(__complex__ _Float128 __z) { return __builtin_csqrtf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_tan(__complex__ _Float128 __z) { return __builtin_ctanf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_tanh(__complex__ _Float128 __z) { return __builtin_ctanhf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_pow(__complex__ _Float128 __x, __complex__ _Float128 __y)
+  { return __builtin_cpowf128(__x, __y); }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __gnu_cxx::__bfloat16_t
+  __complex_abs(__complex__ decltype(0.0bf16) __z)
+  { return __gnu_cxx::__bfloat16_t(__builtin_cabsf(__z)); }
+
+  inline __gnu_cxx::__bfloat16_t
+  __complex_arg(__complex__ decltype(0.0bf16) __z)
+  { return __gnu_cxx::__bfloat16_t(__builtin_cargf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_cos(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_ccosf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_cosh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_ccoshf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_exp(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_cexpf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_log(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_clogf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_sin(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_csinf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_sinh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_csinhf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_sqrt(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_csqrtf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_tan(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_ctanf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_tanh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_ctanhf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_pow(__complex__ decltype(0.0bf16) __x,
+		__complex__ decltype(0.0bf16) __y)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_cpowf(__x,
+								      __y)); }
+#endif
+#endif
+
   /// 26.2.3  complex specializations
   /// complex<float> specialization
   template<>
@@ -1098,8 +1359,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus > 202002L
+      template<typename _Up>
+	explicit(!requires(_Up __u) { value_type{__u}; })
+	constexpr complex(const complex<_Up>& __z)
+	: _M_value{ value_type(__z.real()), value_type(__z.imag()) } { }
+#else
       explicit _GLIBCXX_CONSTEXPR complex(const complex<double>&);
       explicit _GLIBCXX_CONSTEXPR complex(const complex<long double>&);
+#endif
 
 #if __cplusplus >= 201103L
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
@@ -1244,10 +1512,17 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus > 202002L
+      template<typename _Up>
+	explicit(!requires(_Up __u) { value_type{__u}; })
+	constexpr complex(const complex<_Up>& __z)
+	: _M_value{ value_type(__z.real()), value_type(__z.imag()) } { }
+#else
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }
 
       explicit _GLIBCXX_CONSTEXPR complex(const complex<long double>&);
+#endif
 
 #if __cplusplus >= 201103L
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
@@ -1391,11 +1666,18 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       }
 #endif
 
+#if __cplusplus > 202002L
+      template<typename _Up>
+	explicit(!requires(_Up __u) { value_type{__u}; })
+	constexpr complex(const complex<_Up>& __z)
+	: _M_value{ value_type(__z.real()), value_type(__z.imag()) } { }
+#else
       _GLIBCXX_CONSTEXPR complex(const complex<float>& __z)
       : _M_value(__z.__rep()) { }
 
       _GLIBCXX_CONSTEXPR complex(const complex<double>& __z)
       : _M_value(__z.__rep()) { }
+#endif
 
 #if __cplusplus >= 201103L
       // _GLIBCXX_RESOLVE_LIB_DEFECTS
@@ -1517,6 +1799,161 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _ComplexT _M_value;
     };
 
+#if __cplusplus > 202002L
+  template<typename _Tp>
+    struct __complex_type
+    { };
+
+#ifdef __STDCPP_FLOAT16_T__
+  template<>
+    struct __complex_type<_Float16>
+    { typedef __complex__ _Float16 type; };
+#endif
+
+#ifdef __STDCPP_FLOAT32_T__
+  template<>
+    struct __complex_type<_Float32>
+    { typedef __complex__ _Float32 type; };
+#endif
+
+#ifdef __STDCPP_FLOAT64_T__
+  template<>
+    struct __complex_type<_Float64>
+    { typedef __complex__ _Float64 type; };
+#endif
+
+#ifdef __STDCPP_FLOAT128_T__
+  template<>
+    struct __complex_type<_Float128>
+    { typedef __complex__ _Float128 type; };
+#endif
+
+#ifdef __STDCPP_BFLOAT16_T__
+  template<>
+    struct __complex_type<__gnu_cxx::__bfloat16_t>
+    { typedef __complex__ decltype(0.0bf16) type; };
+#endif
+
+  template<typename _Tp>
+    requires(__complex_type<_Tp>::type)
+    class complex<_Tp>
+    {
+    public:
+      typedef _Tp value_type;
+      typedef std::__complex_type<_Tp>::type _ComplexT;
+
+      constexpr complex(_ComplexT __z) : _M_value(__z) { }
+
+      constexpr complex(_Tp __r = _Tp(), _Tp __i = _Tp())
+      : _M_value{ __r, __i } { }
+
+      template<typename _Up>
+	explicit(!requires(_Up __u) { value_type{__u}; })
+	constexpr complex(const complex<_Up>& __z)
+	: _M_value{ value_type(__z.real()), value_type(__z.imag()) } { }
+
+      constexpr _Tp
+      real() const { return __real__ _M_value; }
+
+      constexpr _Tp
+      imag() const { return __imag__ _M_value; }
+
+      constexpr void
+      real(_Tp __val) { __real__ _M_value = __val; }
+
+      constexpr void
+      imag(_Tp __val) { __imag__ _M_value = __val; }
+
+      constexpr complex&
+      operator=(_Tp __f)
+      {
+	_M_value = __f;
+	return *this;
+      }
+
+      constexpr complex&
+      operator+=(_Tp __f)
+      {
+	_M_value += __f;
+	return *this;
+      }
+
+      constexpr complex&
+      operator-=(_Tp __f)
+      {
+	_M_value -= __f;
+	return *this;
+      }
+
+      constexpr complex&
+      operator*=(_Tp __f)
+      {
+	_M_value *= __f;
+	return *this;
+      }
+
+      constexpr complex&
+      operator/=(_Tp __f)
+      {
+	_M_value /= __f;
+	return *this;
+      }
+
+      // Let the compiler synthesize the copy and assignment
+      // operator.  It always does a pretty good job.
+      constexpr complex& operator=(const complex&) = default;
+
+      template<typename _Up>
+	constexpr complex&
+	operator=(const complex<_Up>&  __z)
+	{
+	  __real__ _M_value = __z.real();
+	  __imag__ _M_value = __z.imag();
+	  return *this;
+	}
+
+      template<typename _Up>
+	constexpr complex&
+	operator+=(const complex<_Up>& __z)
+	{
+	  _M_value += __z.__rep();
+	  return *this;
+	}
+
+      template<class _Up>
+	constexpr complex&
+	operator-=(const complex<_Up>& __z)
+	{
+	  _M_value -= __z.__rep();
+	  return *this;
+	}
+
+      template<class _Up>
+	constexpr complex&
+	operator*=(const complex<_Up>& __z)
+	{
+	  const _ComplexT __t = __z.__rep();
+	  _M_value *= __t;
+	  return *this;
+	}
+
+      template<class _Up>
+	constexpr complex&
+	operator/=(const complex<_Up>& __z)
+	{
+	  const _ComplexT __t = __z.__rep();
+	  _M_value /= __t;
+	  return *this;
+	}
+
+      constexpr _ComplexT __rep() const { return _M_value; }
+
+    private:
+      _ComplexT _M_value;
+    };
+#endif
+
+#if __cplusplus <= 202002L
   // These bits have to be at the end of this file, so that the
   // specializations have all been defined.
   inline _GLIBCXX_CONSTEXPR
@@ -1530,6 +1967,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   inline _GLIBCXX_CONSTEXPR
   complex<double>::complex(const complex<long double>& __z)
   : _M_value(__z.__rep()) { }
+#endif
 
   // Inhibit implicit instantiations for required instantiations,
   // which are defined via explicit instantiations elsewhere.
@@ -1809,6 +2247,162 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { return __complex_atanh(__z); }
 #endif
 
+#if _GLIBCXX_USE_C99_COMPLEX_TR1
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ _Float16
+  __complex_acos(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_cacosf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_asin(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_casinf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_atan(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_catanf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_acosh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_cacoshf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_asinh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_casinhf(__z)); }
+
+  inline __complex__ _Float16
+  __complex_atanh(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_catanhf(__z)); }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ _Float32
+  __complex_acos(__complex__ _Float32 __z)
+  { return __builtin_cacosf(__z); }
+
+  inline __complex__ _Float32
+  __complex_asin(__complex__ _Float32 __z)
+  { return __builtin_casinf(__z); }
+
+  inline __complex__ _Float32
+  __complex_atan(__complex__ _Float32 __z)
+  { return __builtin_catanf(__z); }
+
+  inline __complex__ _Float32
+  __complex_acosh(__complex__ _Float32 __z)
+  { return __builtin_cacoshf(__z); }
+
+  inline __complex__ _Float32
+  __complex_asinh(__complex__ _Float32 __z)
+  { return __builtin_casinhf(__z); }
+
+  inline __complex__ _Float32
+  __complex_atanh(__complex__ _Float32 __z)
+  { return __builtin_catanhf(__z); }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+  inline __complex__ _Float64
+  __complex_acos(__complex__ _Float64 __z)
+  { return __builtin_cacos(__z); }
+
+  inline __complex__ _Float64
+  __complex_asin(__complex__ _Float64 __z)
+  { return __builtin_casin(__z); }
+
+  inline __complex__ _Float64
+  __complex_atan(__complex__ _Float64 __z)
+  { return __builtin_catan(__z); }
+
+  inline __complex__ _Float64
+  __complex_acosh(__complex__ _Float64 __z)
+  { return __builtin_cacosh(__z); }
+
+  inline __complex__ _Float64
+  __complex_asinh(__complex__ _Float64 __z)
+  { return __builtin_casinh(__z); }
+
+  inline __complex__ _Float64
+  __complex_atanh(__complex__ _Float64 __z)
+  { return __builtin_catanh(__z); }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+  inline __complex__ _Float128
+  __complex_acos(__complex__ _Float128 __z)
+  { return __builtin_cacosl(__z); }
+
+  inline __complex__ _Float128
+  __complex_asin(__complex__ _Float128 __z)
+  { return __builtin_casinl(__z); }
+
+  inline __complex__ _Float128
+  __complex_atan(__complex__ _Float128 __z)
+  { return __builtin_catanl(__z); }
+
+  inline __complex__ _Float128
+  __complex_acosh(__complex__ _Float128 __z)
+  { return __builtin_cacoshl(__z); }
+
+  inline __complex__ _Float128
+  __complex_asinh(__complex__ _Float128 __z)
+  { return __builtin_casinhl(__z); }
+
+  inline __complex__ _Float128
+  __complex_atanh(__complex__ _Float128 __z)
+  { return __builtin_catanhl(__z); }
+#elif defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
+  inline __complex__ _Float128
+  __complex_acos(__complex__ _Float128 __z)
+  { return __builtin_cacosf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_asin(__complex__ _Float128 __z)
+  { return __builtin_casinf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_atan(__complex__ _Float128 __z)
+  { return __builtin_catanf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_acosh(__complex__ _Float128 __z)
+  { return __builtin_cacoshf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_asinh(__complex__ _Float128 __z)
+  { return __builtin_casinhf128(__z); }
+
+  inline __complex__ _Float128
+  __complex_atanh(__complex__ _Float128 __z)
+  { return __builtin_catanhf128(__z); }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ decltype(0.0bf16)
+  __complex_acos(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_cacosf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_asin(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_casinf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_atan(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_catanf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_acosh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_cacoshf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_asinh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_casinhf(__z)); }
+
+  inline __complex__ decltype(0.0bf16)
+  __complex_atanh(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_catanhf(__z)); }
+#endif
+#endif
+
   template<typename _Tp>
     inline _Tp
     /// fabs(__z) [8.1.8].
@@ -1897,6 +2491,49 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   inline complex<long double>
   __complex_proj(const complex<long double>& __z)
   { return __builtin_cprojl(__z.__rep()); }
+
+#if __cplusplus > 202002L
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ _Float16
+  __complex_proj(__complex__ _Float16 __z)
+  { return static_cast<__complex__ _Float16>(__builtin_cprojf(__z)); }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ _Float32
+  __complex_proj(__complex__ _Float32 __z)
+  { return __builtin_cprojf(__z); }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+  inline __complex__ _Float64
+  __complex_proj(__complex__ _Float64 __z)
+  { return __builtin_cproj(__z); }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+  inline __complex__ _Float128
+  __complex_proj(__complex__ _Float128 __z)
+  { return __builtin_cprojl(__z); }
+#elif defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
+  inline __complex__ _Float128
+  __complex_proj(__complex__ _Float128 __z)
+  { return __builtin_cprojf128(__z); }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+  inline __complex__ decltype(0.0bf16)
+  __complex_proj(__complex__ decltype(0.0bf16) __z)
+  { return static_cast<__complex__ decltype(0.0bf16)>(__builtin_cprojf(__z)); }
+#endif
+
+  template<typename _Tp>
+    requires(__complex_type<_Tp>::type)
+    inline complex<_Tp>
+    __complex_proj(const complex<_Tp>& __z)
+    { return __complex_proj(__z.__rep()); }
+#endif
+
 #elif defined _GLIBCXX_USE_C99_MATH_TR1
   inline complex<float>
   __complex_proj(const complex<float>& __z)
diff --git a/libstdc++-v3/include/std/expected b/libstdc++-v3/include/std/expected
index 3ee13aa..e491ce4 100644
--- a/libstdc++-v3/include/std/expected
+++ b/libstdc++-v3/include/std/expected
@@ -359,7 +359,7 @@ namespace __expected
       requires is_copy_constructible_v<_Tp> && is_copy_constructible_v<_Er>
       && (!is_trivially_copy_constructible_v<_Tp>
 	  || !is_trivially_copy_constructible_v<_Er>)
-      : _M_invalid(), _M_has_value(__x._M_has_value)
+      : _M_has_value(__x._M_has_value)
       {
 	if (_M_has_value)
 	  std::construct_at(__builtin_addressof(_M_val), __x._M_val);
@@ -376,7 +376,7 @@ namespace __expected
       requires is_move_constructible_v<_Tp> && is_move_constructible_v<_Er>
       && (!is_trivially_move_constructible_v<_Tp>
 	  || !is_trivially_move_constructible_v<_Er>)
-      : _M_invalid(), _M_has_value(__x._M_has_value)
+      : _M_has_value(__x._M_has_value)
       {
 	if (_M_has_value)
 	  std::construct_at(__builtin_addressof(_M_val),
@@ -394,7 +394,7 @@ namespace __expected
 	expected(const expected<_Up, _Gr>& __x)
 	noexcept(__and_v<is_nothrow_constructible<_Tp, const _Up&>,
 			 is_nothrow_constructible<_Er, const _Gr&>>)
-	: _M_invalid(), _M_has_value(__x._M_has_value)
+	: _M_has_value(__x._M_has_value)
 	{
 	  if (_M_has_value)
 	    std::construct_at(__builtin_addressof(_M_val), __x._M_val);
@@ -410,7 +410,7 @@ namespace __expected
 	expected(expected<_Up, _Gr>&& __x)
 	noexcept(__and_v<is_nothrow_constructible<_Tp, _Up>,
 			 is_nothrow_constructible<_Er, _Gr>>)
-	: _M_invalid(), _M_has_value(__x._M_has_value)
+	: _M_has_value(__x._M_has_value)
 	{
 	  if (_M_has_value)
 	    std::construct_at(__builtin_addressof(_M_val),
@@ -890,7 +890,6 @@ namespace __expected
       }
 
       union {
-	struct { } _M_invalid;
 	_Tp _M_val;
 	_Er _M_unex;
       };
diff --git a/libstdc++-v3/include/std/functional b/libstdc++-v3/include/std/functional
index d22acaa..b396e8d 100644
--- a/libstdc++-v3/include/std/functional
+++ b/libstdc++-v3/include/std/functional
@@ -285,35 +285,43 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
    * simplify this with variadic templates, because we're introducing
    * unique names for each.
    */
-    extern const _Placeholder<1> _1;
-    extern const _Placeholder<2> _2;
-    extern const _Placeholder<3> _3;
-    extern const _Placeholder<4> _4;
-    extern const _Placeholder<5> _5;
-    extern const _Placeholder<6> _6;
-    extern const _Placeholder<7> _7;
-    extern const _Placeholder<8> _8;
-    extern const _Placeholder<9> _9;
-    extern const _Placeholder<10> _10;
-    extern const _Placeholder<11> _11;
-    extern const _Placeholder<12> _12;
-    extern const _Placeholder<13> _13;
-    extern const _Placeholder<14> _14;
-    extern const _Placeholder<15> _15;
-    extern const _Placeholder<16> _16;
-    extern const _Placeholder<17> _17;
-    extern const _Placeholder<18> _18;
-    extern const _Placeholder<19> _19;
-    extern const _Placeholder<20> _20;
-    extern const _Placeholder<21> _21;
-    extern const _Placeholder<22> _22;
-    extern const _Placeholder<23> _23;
-    extern const _Placeholder<24> _24;
-    extern const _Placeholder<25> _25;
-    extern const _Placeholder<26> _26;
-    extern const _Placeholder<27> _27;
-    extern const _Placeholder<28> _28;
-    extern const _Placeholder<29> _29;
+#if __cpp_inline_variables
+#  define _GLIBCXX_PLACEHOLDER inline
+#else
+#  define _GLIBCXX_PLACEHOLDER extern
+#endif
+
+    _GLIBCXX_PLACEHOLDER const _Placeholder<1> _1;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<2> _2;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<3> _3;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<4> _4;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<5> _5;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<6> _6;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<7> _7;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<8> _8;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<9> _9;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<10> _10;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<11> _11;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<12> _12;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<13> _13;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<14> _14;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<15> _15;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<16> _16;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<17> _17;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<18> _18;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<19> _19;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<20> _20;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<21> _21;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<22> _22;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<23> _23;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<24> _24;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<25> _25;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<26> _26;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<27> _27;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<28> _28;
+    _GLIBCXX_PLACEHOLDER const _Placeholder<29> _29;
+
+#undef _GLIBCXX_PLACEHOLDER
   }
 
   /**
diff --git a/libstdc++-v3/include/std/iostream b/libstdc++-v3/include/std/iostream
index 70318a4..ff78e1c 100644
--- a/libstdc++-v3/include/std/iostream
+++ b/libstdc++-v3/include/std/iostream
@@ -73,7 +73,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   ///@}
 
   // For construction of filebuffers for cout, cin, cerr, clog et. al.
+  // When the init_priority attribute is usable, we do this initialization
+  // in the compiled library instead (src/c++98/ios_init.cc).
+#if !__has_attribute(__init_priority__)
   static ios_base::Init __ioinit;
+#endif
 
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
diff --git a/libstdc++-v3/include/std/istream b/libstdc++-v3/include/std/istream
index 58716ce..8476d62 100644
--- a/libstdc++-v3/include/std/istream
+++ b/libstdc++-v3/include/std/istream
@@ -225,6 +225,94 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       { return _M_extract(__f); }
       ///@}
 
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+      __attribute__((__always_inline__))
+      __istream_type&
+      operator>>(_Float16& __f)
+      {
+	float __flt;
+	__istream_type& __ret = _M_extract(__flt);
+	ios_base::iostate __err = ios_base::goodbit;
+	if (__flt < -__FLT16_MAX__)
+	  {
+	    __f = -__FLT16_MAX__;
+	    __err = ios_base::failbit;
+	  }
+	else if (__flt > __FLT16_MAX__)
+	  {
+	    __f = __FLT16_MAX__;
+	    __err = ios_base::failbit;
+	  }
+	else
+	  __f = static_cast<_Float16>(__flt);
+	if (__err)
+	  this->setstate(__err);
+	return __ret;
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+      __attribute__((__always_inline__))
+      __istream_type&
+      operator>>(_Float32& __f)
+      {
+	float __flt;
+	__istream_type& __ret = _M_extract(__flt);
+	__f = static_cast<_Float32> (__flt);
+	return __ret;
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+      __attribute__((__always_inline__))
+      __istream_type&
+      operator>>(_Float64& __f)
+      {
+	double __dbl;
+	__istream_type& __ret = _M_extract(__dbl);
+	__f = static_cast<_Float64> (__dbl);
+	return __ret;
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+      __attribute__((__always_inline__))
+      __istream_type&
+      operator>>(_Float128& __f)
+      {
+	long double __ldbl;
+	__istream_type& __ret = _M_extract(__ldbl);
+	__f = static_cast<_Float128> (__ldbl);
+	return __ret;
+      }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
+      __attribute__((__always_inline__))
+      __istream_type&
+      operator>>(__gnu_cxx::__bfloat16_t & __f)
+      {
+	float __flt;
+	__istream_type& __ret = _M_extract(__flt);
+	ios_base::iostate __err = ios_base::goodbit;
+	if (__flt < -__BFLT16_MAX__)
+	  {
+	    __f = -__BFLT16_MAX__;
+	    __err = ios_base::failbit;
+	  }
+	else if (__flt > __BFLT16_MAX__)
+	  {
+	    __f = __BFLT16_MAX__;
+	    __err = ios_base::failbit;
+	  }
+	else
+	  __f = static_cast<__gnu_cxx::__bfloat16_t>(__flt);
+	if (__err)
+	  this->setstate(__err);
+	return __ret;
+      }
+#endif
+
       /**
        *  @brief  Basic arithmetic extractors
        *  @param  __p A variable of pointer type.
diff --git a/libstdc++-v3/include/std/ostream b/libstdc++-v3/include/std/ostream
index 674decf..ffffec77 100644
--- a/libstdc++-v3/include/std/ostream
+++ b/libstdc++-v3/include/std/ostream
@@ -235,6 +235,51 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       { return _M_insert(__f); }
       ///@}
 
+#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+      __attribute__((__always_inline__))
+      __ostream_type&
+      operator<<(_Float16 __f)
+      {
+	return _M_insert(static_cast<double>(__f));
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+      __attribute__((__always_inline__))
+      __ostream_type&
+      operator<<(_Float32 __f)
+      {
+	return _M_insert(static_cast<double>(__f));
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+      __attribute__((__always_inline__))
+      __ostream_type&
+      operator<<(_Float64 __f)
+      {
+	return _M_insert(static_cast<double>(__f));
+      }
+#endif
+
+#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
+      __attribute__((__always_inline__))
+      __ostream_type&
+      operator<<(_Float128 __f)
+      {
+	return _M_insert(static_cast<long double>(__f));
+      }
+#endif
+
+#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
+      __attribute__((__always_inline__))
+      __ostream_type&
+      operator<<(__gnu_cxx::__bfloat16_t __f)
+      {
+	return _M_insert(static_cast<double>(__f));
+      }
+#endif
+
       /**
        *  @brief  Pointer arithmetic inserters
        *  @param  __p A variable of pointer type.
diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index c234b54..ba8492b 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -831,10 +831,13 @@ namespace __variant
 	: false_type
 	{ using element_type = _Tp; };
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wignored-qualifiers"
       template <typename... _Args>
 	struct __untag_result<const void(*)(_Args...)>
 	: false_type
 	{ using element_type = void(*)(_Args...); };
+#pragma GCC diagnostic pop
 
       template <typename... _Args>
 	struct __untag_result<__variant_cookie(*)(_Args...)>