[libc++][NFC] Replace _LIBCPP_NORETURN and TEST_NORETURN with [[noreturn]] (llvm#80455)

philnik777 · web-flow · commit 748023dc3210 · 2024-09-11T08:59:46.000+02:00
`[[__noreturn__]]` is now always available, so we can simply use the
attribute directly instead of through a macro.
diff --git a/libcxx/.clang-format b/libcxx/.clang-format
@@ -44,7 +44,6 @@ AttributeMacros: [
                   '_LIBCPP_NO_UNIQUE_ADDRESS',
                   '_LIBCPP_NOALIAS',
                   '_LIBCPP_NODISCARD',
-                  '_LIBCPP_NORETURN',
                   '_LIBCPP_OVERRIDABLE_FUNC_VIS',
                   '_LIBCPP_STANDALONE_DEBUG',
                   '_LIBCPP_TEMPLATE_DATA_VIS',
diff --git a/libcxx/include/__chrono/exception.h b/libcxx/include/__chrono/exception.h
@@ -71,7 +71,7 @@ class nonexistent_local_time : public runtime_error {
 };
 
 template <class _Duration>
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
+[[noreturn]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
     [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
 #    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw nonexistent_local_time(__time, __info);
@@ -115,7 +115,7 @@ class ambiguous_local_time : public runtime_error {
 };
 
 template <class _Duration>
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
+[[noreturn]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
     [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
 #    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw ambiguous_local_time(__time, __info);
diff --git a/libcxx/include/__config b/libcxx/include/__config
@@ -312,7 +312,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) alignas(x)
 #    define _ALIGNAS(x) alignas(x)
-#    define _LIBCPP_NORETURN [[noreturn]]
 #    define _NOEXCEPT noexcept
 #    define _NOEXCEPT_(...) noexcept(__VA_ARGS__)
 #    define _LIBCPP_CONSTEXPR constexpr
@@ -322,7 +321,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #    define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
 #    define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
 #    define _ALIGNAS(x) __attribute__((__aligned__(x)))
-#    define _LIBCPP_NORETURN __attribute__((__noreturn__))
 #    define _LIBCPP_HAS_NO_NOEXCEPT
 #    define nullptr __nullptr
 #    define _NOEXCEPT throw()
diff --git a/libcxx/include/__exception/exception_ptr.h b/libcxx/include/__exception/exception_ptr.h
@@ -159,7 +159,7 @@ _LIBCPP_EXPORTED_FROM_ABI void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
 
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr __copy_exception_ptr(void* __except, const void* __ptr);
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
 
 // This is a built-in template function which automagically extracts the required
 // information.
diff --git a/libcxx/include/__exception/nested_exception.h b/libcxx/include/__exception/nested_exception.h
@@ -40,7 +40,7 @@ class _LIBCPP_EXPORTED_FROM_ABI nested_exception {
   virtual ~nested_exception() _NOEXCEPT;
 
   // access functions
-  _LIBCPP_NORETURN void rethrow_nested() const;
+  [[__noreturn__]] void rethrow_nested() const;
   _LIBCPP_HIDE_FROM_ABI exception_ptr nested_ptr() const _NOEXCEPT { return __ptr_; }
 };
 
@@ -55,19 +55,19 @@ struct __throw_with_nested;
 
 template <class _Tp, class _Up>
 struct __throw_with_nested<_Tp, _Up, true> {
-  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
+  [[__noreturn__]] static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
     throw __nested<_Up>(std::forward<_Tp>(__t));
   }
 };
 
 template <class _Tp, class _Up>
 struct __throw_with_nested<_Tp, _Up, false> {
-  _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
+  [[__noreturn__]] static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
 };
 #endif
 
 template <class _Tp>
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   using _Up = __decay_t<_Tp>;
   static_assert(is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
diff --git a/libcxx/include/__exception/operations.h b/libcxx/include/__exception/operations.h
@@ -22,7 +22,7 @@ namespace std { // purposefully not using versioning namespace
 using unexpected_handler = void (*)();
 _LIBCPP_EXPORTED_FROM_ABI unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
 _LIBCPP_EXPORTED_FROM_ABI unexpected_handler get_unexpected() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void unexpected();
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void unexpected();
 #endif
 
 using terminate_handler = void (*)();
@@ -37,7 +37,7 @@ _LIBCPP_EXPORTED_FROM_ABI int uncaught_exceptions() _NOEXCEPT;
 class _LIBCPP_EXPORTED_FROM_ABI exception_ptr;
 
 _LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
 } // namespace std
 
 #endif // _LIBCPP___EXCEPTION_OPERATIONS_H
diff --git a/libcxx/include/__exception/terminate.h b/libcxx/include/__exception/terminate.h
@@ -16,7 +16,7 @@
 #endif
 
 namespace std { // purposefully not using versioning namespace
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void terminate() _NOEXCEPT;
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void terminate() _NOEXCEPT;
 } // namespace std
 
 #endif // _LIBCPP___EXCEPTION_TERMINATE_H
diff --git a/libcxx/include/__filesystem/filesystem_error.h b/libcxx/include/__filesystem/filesystem_error.h
@@ -69,13 +69,13 @@ class _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_EXPORTED_FROM_ABI filesyst
 
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
 template <class... _Args>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
 __throw_filesystem_error(_Args&&... __args) {
   throw filesystem_error(std::forward<_Args>(__args)...);
 }
 #  else
 template <class... _Args>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY void
 __throw_filesystem_error(_Args&&...) {
   _LIBCPP_VERBOSE_ABORT("filesystem_error was thrown in -fno-exceptions mode");
 }
diff --git a/libcxx/include/__format/format_error.h b/libcxx/include/__format/format_error.h
@@ -35,7 +35,7 @@ class _LIBCPP_EXPORTED_FROM_ABI format_error : public runtime_error {
 };
 _LIBCPP_DIAGNOSTIC_POP
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_format_error(const char* __s) {
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI void __throw_format_error(const char* __s) {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw format_error(__s);
 #  else
diff --git a/libcxx/include/__format/parser_std_format_spec.h b/libcxx/include/__format/parser_std_format_spec.h
@@ -52,13 +52,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace __format_spec {
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void
+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void
 __throw_invalid_option_format_error(const char* __id, const char* __option) {
   std::__throw_format_error(
       (string("The format specifier for ") + __id + " does not allow the " + __option + " option").c_str());
 }
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {
+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {
   std::__throw_format_error(
       (string("The type option contains an invalid value for ") + __id + " formatting argument").c_str());
 }
diff --git a/libcxx/include/__functional/function.h b/libcxx/include/__functional/function.h
@@ -78,7 +78,7 @@ class _LIBCPP_EXPORTED_FROM_ABI bad_function_call : public exception {
 };
 _LIBCPP_DIAGNOSTIC_POP
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_function_call() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_function_call() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_function_call();
 #  else
diff --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h
@@ -123,7 +123,7 @@ class _LIBCPP_EXPORTED_FROM_ABI bad_weak_ptr : public std::exception {
   const char* what() const _NOEXCEPT override;
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_weak_ptr() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_weak_ptr() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_weak_ptr();
 #else
diff --git a/libcxx/include/__system_error/system_error.h b/libcxx/include/__system_error/system_error.h
@@ -39,8 +39,8 @@ class _LIBCPP_EXPORTED_FROM_ABI system_error : public runtime_error {
   _LIBCPP_HIDE_FROM_ABI const error_code& code() const _NOEXCEPT { return __ec_; }
 };
 
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw system_error(__ec, __what_arg);
 #else
diff --git a/libcxx/include/__utility/unreachable.h b/libcxx/include/__utility/unreachable.h
@@ -18,7 +18,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
+[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __libcpp_unreachable() {
   _LIBCPP_ASSERT_INTERNAL(false, "std::unreachable() was reached");
   __builtin_unreachable();
 }
diff --git a/libcxx/include/__verbose_abort b/libcxx/include/__verbose_abort
@@ -20,7 +20,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 // This function should never be called directly from the code -- it should only be called through
 // the _LIBCPP_VERBOSE_ABORT macro.
-_LIBCPP_NORETURN _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS
+[[__noreturn__]] _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_OVERRIDABLE_FUNC_VIS
 _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2) void __libcpp_verbose_abort(const char* __format, ...);
 
 // _LIBCPP_VERBOSE_ABORT(format, args...)
diff --git a/libcxx/include/any b/libcxx/include/any
@@ -127,7 +127,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 #if _LIBCPP_STD_VER >= 17
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST void __throw_bad_any_cast() {
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST void __throw_bad_any_cast() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_any_cast();
 #  else
diff --git a/libcxx/include/future b/libcxx/include/future
@@ -472,7 +472,7 @@ inline _LIBCPP_HIDE_FROM_ABI error_condition make_error_condition(future_errc __
   return error_condition(static_cast<int>(__e), future_category());
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_future_error(future_errc __ev);
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_future_error(future_errc __ev);
 
 class _LIBCPP_EXPORTED_FROM_ABI future_error : public logic_error {
   error_code __ec_;
diff --git a/libcxx/include/ios b/libcxx/include/ios
@@ -440,7 +440,7 @@ public:
   ~failure() _NOEXCEPT override;
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_failure(char const* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_failure(char const* __msg) {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw ios_base::failure(__msg);
 #  else
diff --git a/libcxx/include/new b/libcxx/include/new
@@ -166,9 +166,9 @@ public:
 };
 #endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0
 
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_array_new_length();
 #else
diff --git a/libcxx/include/optional b/libcxx/include/optional
@@ -255,7 +255,7 @@ public:
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS void
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS void
 __throw_bad_optional_access() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_optional_access();
diff --git a/libcxx/include/regex b/libcxx/include/regex
@@ -983,7 +983,7 @@ public:
 };
 
 template <regex_constants::error_type _Ev>
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_regex_error() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_regex_error() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw regex_error(_Ev);
 #else
diff --git a/libcxx/include/stdexcept b/libcxx/include/stdexcept
@@ -209,65 +209,65 @@ public:
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 // in the dylib
-_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_runtime_error(const char*);
+[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_runtime_error(const char*);
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_logic_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_logic_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw logic_error(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("logic_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_domain_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_domain_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw domain_error(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("domain_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_invalid_argument(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_invalid_argument(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw invalid_argument(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("invalid_argument was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_length_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_length_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw length_error(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("length_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw out_of_range(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("out_of_range was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_range_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_range_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw range_error(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("range_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_overflow_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_overflow_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw overflow_error(__msg);
 #else
   _LIBCPP_VERBOSE_ABORT("overflow_error was thrown in -fno-exceptions mode with message \"%s\"", __msg);
 #endif
 }
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_underflow_error(const char* __msg) {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_underflow_error(const char* __msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw underflow_error(__msg);
 #else
diff --git a/libcxx/include/string b/libcxx/include/string
@@ -2230,11 +2230,11 @@ private:
     return std::__is_pointer_in_range(data(), data() + size() + 1, std::addressof(__v));
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const {
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const {
     std::__throw_length_error("basic_string");
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const {
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const {
     std::__throw_out_of_range("basic_string");
   }
 
diff --git a/libcxx/include/typeinfo b/libcxx/include/typeinfo
@@ -373,7 +373,7 @@ private:
 #endif // defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0
 
 _LIBCPP_BEGIN_NAMESPACE_STD
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_cast() {
+[[__noreturn__]] inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_cast() {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_cast();
 #else
diff --git a/libcxx/include/variant b/libcxx/include/variant
@@ -298,7 +298,7 @@ struct __farray {
   _LIBCPP_HIDE_FROM_ABI constexpr const _Tp& operator[](size_t __n) const noexcept { return __buf_[__n]; }
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS void
+[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS void
 __throw_bad_variant_access() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_variant_access();
diff --git a/libcxx/include/vector b/libcxx/include/vector
@@ -995,9 +995,9 @@ private:
     __move_assign_alloc(__c, integral_constant<bool, __alloc_traits::propagate_on_container_move_assignment::value>());
   }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
 
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void __copy_assign_alloc(const vector& __c, true_type) {
     if (__alloc() != __c.__alloc()) {
@@ -2163,9 +2163,9 @@ public:
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __invariants() const;
 
 private:
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_length_error() const { std::__throw_length_error("vector"); }
 
-  _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
+  [[__noreturn__]] _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("vector"); }
 
   template <class _InputIterator, class _Sentinel>
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
diff --git a/libcxx/src/stdexcept.cpp b/libcxx/src/stdexcept.cpp
@@ -19,7 +19,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-_LIBCPP_NORETURN void __throw_runtime_error(const char* msg) {
+void __throw_runtime_error(const char* msg) {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw runtime_error(msg);
 #else
diff --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
diff --git a/libcxx/src/support/runtime/exception_fallback.ipp b/libcxx/src/support/runtime/exception_fallback.ipp
diff --git a/libcxx/src/support/runtime/exception_msvc.ipp b/libcxx/src/support/runtime/exception_msvc.ipp
diff --git a/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp b/libcxx/src/support/runtime/exception_pointer_cxxabi.ipp
diff --git a/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp b/libcxx/src/support/runtime/exception_pointer_glibcxx.ipp
diff --git a/libcxx/src/support/runtime/exception_pointer_msvc.ipp b/libcxx/src/support/runtime/exception_pointer_msvc.ipp
diff --git a/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp b/libcxx/src/support/runtime/exception_pointer_unimplemented.ipp
diff --git a/libcxx/src/vector.cpp b/libcxx/src/vector.cpp
diff --git a/libcxx/test/support/assert_macros.h b/libcxx/test/support/assert_macros.h
diff --git a/libcxx/test/support/check_assertion.h b/libcxx/test/support/check_assertion.h
diff --git a/libcxx/test/support/count_new.h b/libcxx/test/support/count_new.h
diff --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h

Original file line number	Diff line number	Diff line change
`@@ -52,13 +52,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD`
`52`	`52`
`53`	`53`	`namespace __format_spec {`
`54`	`54`
`55`		`-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void`
	`55`	`+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void`
`56`	`56`	`__throw_invalid_option_format_error(const char* __id, const char* __option) {`
`57`	`57`	`std::__throw_format_error(`
`58`	`58`	`(string("The format specifier for ") + __id + " does not allow the " + __option + " option").c_str());`
`59`	`59`	`}`
`60`	`60`
`61`		`-_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {`
	`61`	`+[[noreturn]] _LIBCPP_HIDE_FROM_ABI inline void __throw_invalid_type_format_error(const char* __id) {`
`62`	`62`	`std::__throw_format_error(`
`63`	`63`	`(string("The type option contains an invalid value for ") + __id + " formatting argument").c_str());`
`64`	`64`	`}`