diff --git a/libcxx/include/__availability b/libcxx/include/__availability
--- a/libcxx/include/__availability
+++ b/libcxx/include/__availability
@@ -149,13 +149,6 @@
 // #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch
 // #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
 
-    // This controls the availability of the C++20 format library.
-    // The library is in development and not ABI stable yet. P2216 is
-    // retroactively accepted in C++20. This paper contains ABI breaking
-    // changes.
-#   define _LIBCPP_AVAILABILITY_FORMAT
-// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
-
     // This controls whether the library claims to provide a default verbose
     // termination function, and consequently whether the headers will try
     // to use it when the mechanism isn't overriden at compile-time.
@@ -259,10 +252,6 @@
 #       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
 #   endif
 
-#   define _LIBCPP_AVAILABILITY_FORMAT                                          \
-        __attribute__((unavailable))
-#   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
-
 #   define _LIBCPP_HAS_NO_VERBOSE_ABORT_IN_LIBRARY
 
 #else
diff --git a/libcxx/include/__chrono/formatter.h b/libcxx/include/__chrono/formatter.h
--- a/libcxx/include/__chrono/formatter.h
+++ b/libcxx/include/__chrono/formatter.h
@@ -542,7 +542,7 @@
 } // namespace __formatter
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_chrono {
+struct _LIBCPP_TEMPLATE_VIS __formatter_chrono {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto __parse(
       basic_format_parse_context<_CharT>& __parse_ctx, __format_spec::__fields __fields, __format_spec::__flags __flags)
@@ -582,7 +582,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -594,7 +594,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -606,7 +606,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -618,7 +618,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -630,7 +630,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday_indexed, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_indexed, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -642,7 +642,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -654,7 +654,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -666,7 +666,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_day_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_day_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -678,7 +678,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -690,7 +690,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::month_weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::month_weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -702,7 +702,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -714,7 +714,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_day, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -726,7 +726,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_day_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_day_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -738,7 +738,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_weekday, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
@@ -750,7 +750,7 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<chrono::year_month_weekday_last, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<chrono::year_month_weekday_last, _CharT>
     : public __formatter_chrono<_CharT> {
 public:
   using _Base = __formatter_chrono<_CharT>;
diff --git a/libcxx/include/__chrono/ostream.h b/libcxx/include/__chrono/ostream.h
--- a/libcxx/include/__chrono/ostream.h
+++ b/libcxx/include/__chrono/ostream.h
@@ -93,7 +93,7 @@
 }
 
 template <class _CharT, class _Traits, class _Rep, class _Period>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const duration<_Rep, _Period>& __d) {
   basic_ostringstream<_CharT, _Traits> __s;
   __s.flags(__os.flags());
@@ -104,8 +104,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
-operator<<(basic_ostream<_CharT, _Traits>& __os, const day& __d) {
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __os, const day& __d) {
   return __os << (__d.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%d}"), __d)
                            // Note this error differs from the wording of the Standard. The
                            // Standard wording doesn't work well on AIX or Windows. There
@@ -117,7 +116,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month& __m) {
   return __os << (__m.ok() ? std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%b}"), __m)
                            : std::format(__os.getloc(),
@@ -126,14 +125,14 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year& __y) {
   return __os << (__y.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%Y}"), __y)
                            : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%Y} is not a valid year"), __y));
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday& __wd) {
   return __os << (__wd.ok() ? std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%a}"), __wd)
                             : std::format(__os.getloc(), // TODO FMT Standard mandated locale isn't used.
@@ -142,7 +141,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday_indexed& __wdi) {
   auto __i = __wdi.index();
   return __os << (__i >= 1 && __i <= 5
@@ -154,13 +153,13 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const weekday_last& __wdl) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}[last]"), __wdl.weekday());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_day& __md) {
   // TODO FMT The Standard allows 30th of February to be printed.
   // It would be nice to show an error message instead.
@@ -168,47 +167,47 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_day_last& __mdl) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/last"), __mdl.month());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_weekday& __mwd) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/{:L}"), __mwd.month(), __mwd.weekday_indexed());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const month_weekday_last& __mwdl) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L}/{:L}"), __mwdl.month(), __mwdl.weekday_last());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month& __ym) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{}/{:L}"), __ym.year(), __ym.month());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_day& __ymd) {
   return __os << (__ymd.ok() ? std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%F}"), __ymd)
                              : std::format(_LIBCPP_STATICALLY_WIDEN(_CharT, "{:%F} is not a valid date"), __ymd));
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_day_last& __ymdl) {
   return __os << std::format(
              __os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{}/{:L}"), __ymdl.year(), __ymdl.month_day_last());
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_weekday& __ymwd) {
   return __os << std::format(
              __os.getloc(),
@@ -219,7 +218,7 @@
 }
 
 template <class _CharT, class _Traits>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const year_month_weekday_last& __ymwdl) {
   return __os << std::format(
              __os.getloc(),
@@ -230,7 +229,7 @@
 }
 
 template <class _CharT, class _Traits, class _Duration>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT basic_ostream<_CharT, _Traits>&
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
 operator<<(basic_ostream<_CharT, _Traits>& __os, const hh_mm_ss<_Duration> __hms) {
   return __os << std::format(__os.getloc(), _LIBCPP_STATICALLY_WIDEN(_CharT, "{:L%T}"), __hms);
 }
diff --git a/libcxx/include/__format/container_adaptor.h b/libcxx/include/__format/container_adaptor.h
--- a/libcxx/include/__format/container_adaptor.h
+++ b/libcxx/include/__format/container_adaptor.h
@@ -37,7 +37,7 @@
 // adaptor headers. To use the format functions users already include <format>.
 
 template <class _Adaptor, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_container_adaptor {
+struct _LIBCPP_TEMPLATE_VIS __formatter_container_adaptor {
 private:
   using __maybe_const_container = __fmt_maybe_const<typename _Adaptor::container_type, _CharT>;
   using __maybe_const_adaptor   = __maybe_const<is_const_v<__maybe_const_container>, _Adaptor>;
@@ -57,15 +57,15 @@
 };
 
 template <class _CharT, class _Tp, formattable<_CharT> _Container>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<queue<_Tp, _Container>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<queue<_Tp, _Container>, _CharT>
     : public __formatter_container_adaptor<queue<_Tp, _Container>, _CharT> {};
 
 template <class _CharT, class _Tp, class _Container, class _Compare>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<priority_queue<_Tp, _Container, _Compare>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<priority_queue<_Tp, _Container, _Compare>, _CharT>
     : public __formatter_container_adaptor<priority_queue<_Tp, _Container, _Compare>, _CharT> {};
 
 template <class _CharT, class _Tp, formattable<_CharT> _Container>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<stack<_Tp, _Container>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<stack<_Tp, _Container>, _CharT>
     : public __formatter_container_adaptor<stack<_Tp, _Container>, _CharT> {};
 
 #endif //_LIBCPP_STD_VER >= 23
diff --git a/libcxx/include/__format/format_arg.h b/libcxx/include/__format/format_arg.h
--- a/libcxx/include/__format/format_arg.h
+++ b/libcxx/include/__format/format_arg.h
@@ -95,7 +95,7 @@
 // This function is not user obervable, so it can directly use the non-standard
 // types of the "variant". See __arg_t for more details.
 template <class _Visitor, class _Context>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT decltype(auto)
+_LIBCPP_HIDE_FROM_ABI decltype(auto)
 __visit_format_arg(_Visitor&& __vis, basic_format_arg<_Context> __arg) {
   switch (__arg.__type_) {
   case __format::__arg_t::__none:
@@ -225,7 +225,7 @@
 };
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_arg {
+class _LIBCPP_TEMPLATE_VIS basic_format_arg {
 public:
   class _LIBCPP_TEMPLATE_VIS handle;
 
@@ -277,7 +277,7 @@
 // This function is user facing, so it must wrap the non-standard types of
 // the "variant" in a handle to stay conforming. See __arg_t for more details.
 template <class _Visitor, class _Context>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT decltype(auto)
+_LIBCPP_HIDE_FROM_ABI decltype(auto)
 visit_format_arg(_Visitor&& __vis, basic_format_arg<_Context> __arg) {
   switch (__arg.__type_) {
 #  ifndef _LIBCPP_HAS_NO_INT128
diff --git a/libcxx/include/__format/format_args.h b/libcxx/include/__format/format_args.h
--- a/libcxx/include/__format/format_args.h
+++ b/libcxx/include/__format/format_args.h
@@ -27,7 +27,7 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_args {
+class _LIBCPP_TEMPLATE_VIS basic_format_args {
 public:
   _LIBCPP_HIDE_FROM_ABI basic_format_args() noexcept = default;
 
diff --git a/libcxx/include/__format/format_context.h b/libcxx/include/__format/format_context.h
--- a/libcxx/include/__format/format_context.h
+++ b/libcxx/include/__format/format_context.h
@@ -41,7 +41,7 @@
 
 template <class _OutIt, class _CharT>
 requires output_iterator<_OutIt, const _CharT&>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_context;
+class _LIBCPP_TEMPLATE_VIS basic_format_context;
 
 #ifndef _LIBCPP_HAS_NO_LOCALIZATION
 /**
@@ -80,7 +80,6 @@
 class
     // clang-format off
     _LIBCPP_TEMPLATE_VIS
-    _LIBCPP_AVAILABILITY_FORMAT
     _LIBCPP_PREFERRED_NAME(format_context)
     _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wformat_context))
     // clang-format on
@@ -162,7 +161,7 @@
 // Here the width of an element in input is determined dynamically.
 // Note when the top-level element has no width the retargeting is not needed.
 template <class _CharT>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT
+class _LIBCPP_TEMPLATE_VIS
     basic_format_context<typename __format::__retarget_buffer<_CharT>::__iterator, _CharT> {
 public:
   using iterator  = typename __format::__retarget_buffer<_CharT>::__iterator;
diff --git a/libcxx/include/__format/format_functions.h b/libcxx/include/__format/format_functions.h
--- a/libcxx/include/__format/format_functions.h
+++ b/libcxx/include/__format/format_functions.h
@@ -344,7 +344,7 @@
                            _Context{__types_.data(), __handles_.data(), sizeof...(_Args)});
   }
 
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT constexpr basic_string_view<_CharT> get() const noexcept {
+  _LIBCPP_HIDE_FROM_ABI constexpr basic_string_view<_CharT> get() const noexcept {
     return __str_;
   }
 
@@ -409,21 +409,21 @@
 // https://reviews.llvm.org/D110499#inline-1180704
 // TODO FMT Evaluate whether we want to file a Clang bug report regarding this.
 template <output_iterator<const char&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 vformat_to(_OutIt __out_it, string_view __fmt, format_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 vformat_to(_OutIt __out_it, wstring_view __fmt, wformat_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), __fmt, __args);
 }
 #endif
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt.get(),
                            _VSTD::make_format_args(__args...));
@@ -431,14 +431,17 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), __fmt.get(),
                            _VSTD::make_wformat_args(__args...));
 }
 #endif
 
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI string
 vformat(string_view __fmt, format_args __args) {
   string __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
@@ -446,7 +449,10 @@
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI wstring
 vformat(wstring_view __fmt, wformat_args __args) {
   wstring __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), __fmt, __args);
@@ -455,14 +461,14 @@
 #endif
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string format(format_string<_Args...> __fmt,
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI string format(format_string<_Args...> __fmt,
                                                                                       _Args&&... __args) {
   return _VSTD::vformat(__fmt.get(), _VSTD::make_format_args(__args...));
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI wstring
 format(wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat(__fmt.get(), _VSTD::make_wformat_args(__args...));
 }
@@ -479,14 +485,14 @@
 }
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformat_to_n<format_context>(_VSTD::move(__out_it), __n, __fmt.get(), _VSTD::make_format_args(__args...));
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, wformat_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<wformat_context>(_VSTD::move(__out_it), __n, __fmt.get(), _VSTD::make_wformat_args(__args...));
@@ -502,14 +508,14 @@
 }
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(__fmt.get(), basic_format_args{_VSTD::make_format_args(__args...)});
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(__fmt.get(), basic_format_args{_VSTD::make_wformat_args(__args...)});
 }
@@ -536,7 +542,7 @@
 }
 
 template <output_iterator<const char&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt vformat_to(
     _OutIt __out_it, locale __loc, string_view __fmt, format_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
                              __args);
@@ -544,7 +550,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt vformat_to(
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt vformat_to(
     _OutIt __out_it, locale __loc, wstring_view __fmt, wformat_args __args) {
   return _VSTD::__vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt,
                              __args);
@@ -552,7 +558,7 @@
 #endif
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, locale __loc, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt.get(),
                            _VSTD::make_format_args(__args...));
@@ -560,14 +566,17 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT _OutIt
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _OutIt
 format_to(_OutIt __out_it, locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat_to(_VSTD::move(__out_it), _VSTD::move(__loc), __fmt.get(),
                            _VSTD::make_wformat_args(__args...));
 }
 #endif
 
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI string
 vformat(locale __loc, string_view __fmt, format_args __args) {
   string __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
@@ -576,7 +585,10 @@
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+// TODO FMT This needs to be a template or std::to_chars(floating-point) availability markup
+// fires too eagerly, see http://llvm.org/PR61563.
+template <class = void>
+_LIBCPP_ALWAYS_INLINE inline _LIBCPP_HIDE_FROM_ABI wstring
 vformat(locale __loc, wstring_view __fmt, wformat_args __args) {
   wstring __res;
   _VSTD::vformat_to(_VSTD::back_inserter(__res), _VSTD::move(__loc), __fmt,
@@ -586,7 +598,7 @@
 #endif
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT string format(locale __loc,
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI string format(locale __loc,
                                                                                       format_string<_Args...> __fmt,
                                                                                       _Args&&... __args) {
   return _VSTD::vformat(_VSTD::move(__loc), __fmt.get(),
@@ -595,7 +607,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT wstring
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI wstring
 format(locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::vformat(_VSTD::move(__loc), __fmt.get(),
                         _VSTD::make_wformat_args(__args...));
@@ -614,7 +626,7 @@
 }
 
 template <output_iterator<const char&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc, format_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<format_context>(_VSTD::move(__out_it), __n, _VSTD::move(__loc), __fmt.get(),
@@ -623,7 +635,7 @@
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <output_iterator<const wchar_t&> _OutIt, class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT format_to_n_result<_OutIt>
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI format_to_n_result<_OutIt>
 format_to_n(_OutIt __out_it, iter_difference_t<_OutIt> __n, locale __loc, wformat_string<_Args...> __fmt,
             _Args&&... __args) {
   return _VSTD::__vformat_to_n<wformat_context>(_VSTD::move(__out_it), __n, _VSTD::move(__loc), __fmt.get(),
@@ -641,14 +653,14 @@
 }
 
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(locale __loc, format_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(_VSTD::move(__loc), __fmt.get(), basic_format_args{_VSTD::make_format_args(__args...)});
 }
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <class... _Args>
-_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI _LIBCPP_AVAILABILITY_FORMAT size_t
+_LIBCPP_ALWAYS_INLINE _LIBCPP_HIDE_FROM_ABI size_t
 formatted_size(locale __loc, wformat_string<_Args...> __fmt, _Args&&... __args) {
   return _VSTD::__vformatted_size(_VSTD::move(__loc), __fmt.get(), basic_format_args{_VSTD::make_wformat_args(__args...)});
 }
diff --git a/libcxx/include/__format/format_fwd.h b/libcxx/include/__format/format_fwd.h
--- a/libcxx/include/__format/format_fwd.h
+++ b/libcxx/include/__format/format_fwd.h
@@ -23,14 +23,14 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <class _Context>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_arg;
+class _LIBCPP_TEMPLATE_VIS basic_format_arg;
 
 template <class _OutIt, class _CharT>
   requires output_iterator<_OutIt, const _CharT&>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_context;
+class _LIBCPP_TEMPLATE_VIS basic_format_context;
 
 template <class _Tp, class _CharT = char>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter;
+struct _LIBCPP_TEMPLATE_VIS formatter;
 
 #endif //_LIBCPP_STD_VER >= 20
 
diff --git a/libcxx/include/__format/format_parse_context.h b/libcxx/include/__format/format_parse_context.h
--- a/libcxx/include/__format/format_parse_context.h
+++ b/libcxx/include/__format/format_parse_context.h
@@ -24,7 +24,7 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <class _CharT>
-class _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT basic_format_parse_context {
+class _LIBCPP_TEMPLATE_VIS basic_format_parse_context {
 public:
   using char_type = _CharT;
   using const_iterator = typename basic_string_view<_CharT>::const_iterator;
diff --git a/libcxx/include/__format/formatter.h b/libcxx/include/__format/formatter.h
--- a/libcxx/include/__format/formatter.h
+++ b/libcxx/include/__format/formatter.h
@@ -32,7 +32,7 @@
 /// - is_copy_assignable<F>, and
 /// - is_move_assignable<F>.
 template <class _Tp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter {
+struct _LIBCPP_TEMPLATE_VIS formatter {
   formatter() = delete;
   formatter(const formatter&) = delete;
   formatter& operator=(const formatter&) = delete;
diff --git a/libcxx/include/__format/formatter_bool.h b/libcxx/include/__format/formatter_bool.h
--- a/libcxx/include/__format/formatter_bool.h
+++ b/libcxx/include/__format/formatter_bool.h
@@ -36,7 +36,7 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<bool, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<bool, _CharT> {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
diff --git a/libcxx/include/__format/formatter_char.h b/libcxx/include/__format/formatter_char.h
--- a/libcxx/include/__format/formatter_char.h
+++ b/libcxx/include/__format/formatter_char.h
@@ -31,7 +31,7 @@
 #if _LIBCPP_STD_VER >= 20
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_char {
+struct _LIBCPP_TEMPLATE_VIS __formatter_char {
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
   parse(basic_format_parse_context<_CharT>& __parse_ctx) -> decltype(__parse_ctx.begin()) {
@@ -74,14 +74,14 @@
 };
 
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, char> : public __formatter_char<char> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<char, char> : public __formatter_char<char> {};
 
 #  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<char, wchar_t> : public __formatter_char<wchar_t> {};
 
 template <>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {
+struct _LIBCPP_TEMPLATE_VIS formatter<wchar_t, wchar_t> : public __formatter_char<wchar_t> {
 };
 
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
diff --git a/libcxx/include/__format/formatter_floating_point.h b/libcxx/include/__format/formatter_floating_point.h
--- a/libcxx/include/__format/formatter_floating_point.h
+++ b/libcxx/include/__format/formatter_floating_point.h
@@ -739,13 +739,13 @@
 };
 
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<float, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<float, _CharT>
     : public __formatter_floating_point<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<double, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<double, _CharT>
     : public __formatter_floating_point<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long double, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<long double, _CharT>
     : public __formatter_floating_point<_CharT> {};
 
 #endif //_LIBCPP_STD_VER >= 20
diff --git a/libcxx/include/__format/formatter_integer.h b/libcxx/include/__format/formatter_integer.h
--- a/libcxx/include/__format/formatter_integer.h
+++ b/libcxx/include/__format/formatter_integer.h
@@ -31,7 +31,7 @@
 #if _LIBCPP_STD_VER >= 20
 
     template <__fmt_char_type _CharT>
-    struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_integer {
+    struct _LIBCPP_TEMPLATE_VIS __formatter_integer {
 
 public:
   _LIBCPP_HIDE_FROM_ABI constexpr auto
@@ -60,43 +60,43 @@
 
 // Signed integral types.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<signed char, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<signed char, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<short, _CharT> : public __formatter_integer<_CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<short, _CharT> : public __formatter_integer<_CharT> {
 };
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<int, _CharT> : public __formatter_integer<_CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<int, _CharT> : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long, _CharT> : public __formatter_integer<_CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<long, _CharT> : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<long long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<long long, _CharT>
     : public __formatter_integer<_CharT> {};
 #  ifndef _LIBCPP_HAS_NO_INT128
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<__int128_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<__int128_t, _CharT>
     : public __formatter_integer<_CharT> {};
 #  endif
 
 // Unsigned integral types.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned char, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned char, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned short, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned short, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned long, _CharT>
     : public __formatter_integer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<unsigned long long, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<unsigned long long, _CharT>
     : public __formatter_integer<_CharT> {};
 #  ifndef _LIBCPP_HAS_NO_INT128
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<__uint128_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<__uint128_t, _CharT>
     : public __formatter_integer<_CharT> {};
 #  endif
 
diff --git a/libcxx/include/__format/formatter_pointer.h b/libcxx/include/__format/formatter_pointer.h
--- a/libcxx/include/__format/formatter_pointer.h
+++ b/libcxx/include/__format/formatter_pointer.h
@@ -55,13 +55,13 @@
 // - template<> struct formatter<void*, charT>;
 // - template<> struct formatter<const void*, charT>;
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<nullptr_t, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<nullptr_t, _CharT>
     : public __formatter_pointer<_CharT> {};
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<void*, _CharT> : public __formatter_pointer<_CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<void*, _CharT> : public __formatter_pointer<_CharT> {
 };
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const void*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<const void*, _CharT>
     : public __formatter_pointer<_CharT> {};
 
 #endif //_LIBCPP_STD_VER >= 20
diff --git a/libcxx/include/__format/formatter_string.h b/libcxx/include/__format/formatter_string.h
--- a/libcxx/include/__format/formatter_string.h
+++ b/libcxx/include/__format/formatter_string.h
@@ -57,7 +57,7 @@
 
 // Formatter const char*.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<const _CharT*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<const _CharT*, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -95,7 +95,7 @@
 
 // Formatter char*.
 template <__fmt_char_type _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT*, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<_CharT*, _CharT>
     : public formatter<const _CharT*, _CharT> {
   using _Base = formatter<const _CharT*, _CharT>;
 
@@ -106,7 +106,7 @@
 
 // Formatter char[].
 template <__fmt_char_type _CharT, size_t _Size>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_CharT[_Size], _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<_CharT[_Size], _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -117,7 +117,7 @@
 
 // Formatter std::string.
 template <__fmt_char_type _CharT, class _Traits, class _Allocator>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string<_CharT, _Traits, _Allocator>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<basic_string<_CharT, _Traits, _Allocator>, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
@@ -130,7 +130,7 @@
 
 // Formatter std::string_view.
 template <__fmt_char_type _CharT, class _Traits>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<basic_string_view<_CharT, _Traits>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<basic_string_view<_CharT, _Traits>, _CharT>
     : public __formatter_string<_CharT> {
   using _Base = __formatter_string<_CharT>;
 
diff --git a/libcxx/include/__format/formatter_tuple.h b/libcxx/include/__format/formatter_tuple.h
--- a/libcxx/include/__format/formatter_tuple.h
+++ b/libcxx/include/__format/formatter_tuple.h
@@ -39,7 +39,7 @@
 #if _LIBCPP_STD_VER >= 23
 
 template <__fmt_char_type _CharT, class _Tuple, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __formatter_tuple {
+struct _LIBCPP_TEMPLATE_VIS __formatter_tuple {
   _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) noexcept {
     __separator_ = __separator;
   }
@@ -164,11 +164,11 @@
 };
 
 template <__fmt_char_type _CharT, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<pair<_Args...>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<pair<_Args...>, _CharT>
     : public __formatter_tuple<_CharT, pair<_Args...>, _Args...> {};
 
 template <__fmt_char_type _CharT, formattable<_CharT>... _Args>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<tuple<_Args...>, _CharT>
+struct _LIBCPP_TEMPLATE_VIS formatter<tuple<_Args...>, _CharT>
     : public __formatter_tuple<_CharT, tuple<_Args...>, _Args...> {};
 
 #endif //_LIBCPP_STD_VER >= 23
diff --git a/libcxx/include/__format/range_default_formatter.h b/libcxx/include/__format/range_default_formatter.h
--- a/libcxx/include/__format/range_default_formatter.h
+++ b/libcxx/include/__format/range_default_formatter.h
@@ -84,12 +84,12 @@
 }();
 
 template <range_format _Kp, ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter;
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter;
 
 // Required specializations
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::sequence, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::sequence, _Rp, _CharT> {
 private:
   using __maybe_const_r = __fmt_maybe_const<_Rp, _CharT>;
   range_formatter<remove_cvref_t<ranges::range_reference_t<__maybe_const_r>>, _CharT> __underlying_;
@@ -115,7 +115,7 @@
 };
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::map, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::map, _Rp, _CharT> {
 private:
   using __maybe_const_map = __fmt_maybe_const<_Rp, _CharT>;
   using __element_type    = remove_cvref_t<ranges::range_reference_t<__maybe_const_map>>;
@@ -143,7 +143,7 @@
 };
 
 template <ranges::input_range _Rp, class _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<range_format::set, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<range_format::set, _Rp, _CharT> {
 private:
   using __maybe_const_set = __fmt_maybe_const<_Rp, _CharT>;
   using __element_type    = remove_cvref_t<ranges::range_reference_t<__maybe_const_set>>;
@@ -168,14 +168,13 @@
 
 template <range_format _Kp, ranges::input_range _Rp, class _CharT>
   requires(_Kp == range_format::string || _Kp == range_format::debug_string)
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT __range_default_formatter<_Kp, _Rp, _CharT> {
+struct _LIBCPP_TEMPLATE_VIS __range_default_formatter<_Kp, _Rp, _CharT> {
   __range_default_formatter() = delete; // TODO FMT Implement
 };
 
 template <ranges::input_range _Rp, class _CharT>
   requires(format_kind<_Rp> != range_format::disabled && formattable<ranges::range_reference_t<_Rp>, _CharT>)
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_Rp, _CharT>
-    : __range_default_formatter<format_kind<_Rp>, _Rp, _CharT> {};
+struct _LIBCPP_TEMPLATE_VIS formatter<_Rp, _CharT> : __range_default_formatter<format_kind<_Rp>, _Rp, _CharT> {};
 
 #endif //_LIBCPP_STD_VER >= 23
 
diff --git a/libcxx/include/__format/range_formatter.h b/libcxx/include/__format/range_formatter.h
--- a/libcxx/include/__format/range_formatter.h
+++ b/libcxx/include/__format/range_formatter.h
@@ -40,7 +40,7 @@
 
 template <class _Tp, class _CharT = char>
   requires same_as<remove_cvref_t<_Tp>, _Tp> && formattable<_Tp, _CharT>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT range_formatter {
+struct _LIBCPP_TEMPLATE_VIS range_formatter {
   _LIBCPP_HIDE_FROM_ABI constexpr void set_separator(basic_string_view<_CharT> __separator) noexcept {
     __separator_ = __separator;
   }
diff --git a/libcxx/include/vector b/libcxx/include/vector
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -3328,7 +3328,7 @@
 template <class _Tp, class CharT>
 // Since is-vector-bool-reference is only used once it's inlined here.
   requires same_as<typename _Tp::__container, vector<bool, typename _Tp::__container::allocator_type>>
-struct _LIBCPP_TEMPLATE_VIS _LIBCPP_AVAILABILITY_FORMAT formatter<_Tp, CharT> {
+struct _LIBCPP_TEMPLATE_VIS formatter<_Tp, CharT> {
 private:
   formatter<bool, CharT> __underlying_;
 
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.format.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.vformat.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
 // following formatter specialization where adaptor-type is the name of the
diff --git a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
--- a/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
+++ b/libcxx/test/std/containers/container.adaptors/container.adaptors.format/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // [container.adaptors.format]
 // For each of queue, priority_queue, and stack, the library provides the
 // following formatter specialization where adaptor-type is the name of the
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.format.pass.cpp
@@ -11,6 +11,10 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <vector>
 
 // template<class T, class charT>
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.vformat.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <vector>
 
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <vector>
 
 // template<class T, class charT>
diff --git a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
--- a/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
+++ b/libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <vector>
 
 // template<class T, class charT>
diff --git a/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.hms/time.hms.nonmembers/ostream.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.day/time.cal.day.nonmembers/ostream.pass.cpp
@@ -15,6 +15,10 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.md/time.cal.md.nonmembers/ostream.pass.cpp
@@ -16,6 +16,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mdlast/ostream.pass.cpp
@@ -18,6 +18,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.month/time.cal.month.nonmembers/ostream.pass.cpp
@@ -15,6 +15,10 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mwd/time.cal.mwd.nonmembers/ostream.pass.cpp
@@ -18,6 +18,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.mwdlast/time.cal.mwdlast.nonmembers/ostream.pass.cpp
@@ -18,6 +18,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.wdidx/time.cal.wdidx.nonmembers/ostream.pass.cpp
@@ -13,6 +13,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.wdlast/time.cal.wdlast.nonmembers/ostream.pass.cpp
@@ -13,6 +13,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.weekday/time.cal.weekday.nonmembers/ostream.pass.cpp
@@ -10,6 +10,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.year/time.cal.year.nonmembers/ostream.pass.cpp
@@ -13,6 +13,10 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ym/time.cal.ym.nonmembers/ostream.pass.cpp
@@ -18,6 +18,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymd/time.cal.ymd.nonmembers/ostream.pass.cpp
@@ -16,6 +16,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymdlast/time.cal.ymdlast.nonmembers/ostream.pass.cpp
@@ -18,6 +18,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymwd/time.cal.ymwd.nonmembers/ostream.pass.cpp
@@ -16,6 +16,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp b/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
--- a/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.cal/time.cal.ymwdlast/time.cal.ymwdlast.nonmembers/ostream.pass.cpp
@@ -16,6 +16,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp b/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
--- a/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
+++ b/libcxx/test/std/time/time.duration/time.duration.nonmember/ostream.pass.cpp
@@ -15,6 +15,10 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp b/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.hh_mm_ss.pass.cpp
@@ -17,6 +17,9 @@
 
 // XFAIL: LIBCXX-FREEBSD-FIXME
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.day.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp b/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.duration.pass.cpp
@@ -16,6 +16,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.month.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month.pass.cpp
@@ -11,6 +11,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_day.pass.cpp
@@ -17,6 +17,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_day_last.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.month_weekday.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday_index.pass.cpp
@@ -17,6 +17,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.weekday_last.pass.cpp
@@ -17,6 +17,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT Investigate Windows issues.
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_day.pass.cpp
@@ -17,6 +17,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_day_last.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_weekday.pass.cpp
@@ -14,6 +14,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp b/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
--- a/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
+++ b/libcxx/test/std/time/time.syn/formatter.year_month_weekday_last.pass.cpp
@@ -12,6 +12,10 @@
 // TODO FMT It seems GCC uses too much memory in the CI and fails.
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.fr_FR.UTF-8
 // REQUIRES: locale.ja_JP.UTF-8
 
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_format_args.pass.cpp
@@ -22,10 +22,10 @@
 #include "test_macros.h"
 
 int main(int, char**) {
-  [[maybe_unused]] auto store = std::make_format_args(42, nullptr, false, 1.0);
+  [[maybe_unused]] auto store = std::make_format_args(42, nullptr, false, 'x');
 
   LIBCPP_STATIC_ASSERT(
-      std::same_as<decltype(store), std::__format_arg_store<std::format_context, int, nullptr_t, bool, double>>);
+      std::same_as<decltype(store), std::__format_arg_store<std::format_context, int, nullptr_t, bool, char>>);
 
   return 0;
 }
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.arg.store/make_wformat_args.pass.cpp
@@ -22,10 +22,10 @@
 #include "test_macros.h"
 
 int main(int, char**) {
-  [[maybe_unused]] auto store = std::make_wformat_args(42, nullptr, false, 1.0);
+  [[maybe_unused]] auto store = std::make_wformat_args(42, nullptr, false, 'x');
 
   LIBCPP_STATIC_ASSERT(
-      std::same_as<decltype(store), std::__format_arg_store<std::wformat_context, int, nullptr_t, bool, double>>);
+      std::same_as<decltype(store), std::__format_arg_store<std::wformat_context, int, nullptr_t, bool, char>>);
 
   return 0;
 }
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp
@@ -8,9 +8,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // template<class Visitor, class Context>
diff --git a/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp b/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
--- a/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.arguments/format.args/get.pass.cpp
@@ -8,9 +8,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // basic_format_arg<Context> get(size_t i) const noexcept;
diff --git a/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp b/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
--- a/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.error/format.error.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // class format_error;
diff --git a/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp b/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
--- a/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.fmt.string/ctor.verify.cpp
@@ -33,14 +33,14 @@
   (void)std::basic_format_string<char>{"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{0:{0}}"};
-  (void)std::basic_format_string<char, float>{"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
+  (void)std::basic_format_string<char, bool>{"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<char, int>{"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
   (void)std::basic_format_string<wchar_t>{L"foo"};
   (void)std::basic_format_string<wchar_t>{L"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{0:{0}}"};
-  (void)std::basic_format_string<wchar_t, float>{L"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
+  (void)std::basic_format_string<wchar_t, bool>{L"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
   (void)std::basic_format_string<wchar_t, int>{L"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
 #endif
 }
diff --git a/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp b/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
--- a/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.fmt.string/get.pass.cpp
@@ -35,10 +35,10 @@
 constexpr bool test() {
   assert((std::basic_format_string<CharT>{CSTR("foo")}.get() == SV("foo")));
   assert((std::basic_format_string<CharT, int>{CSTR("{}")}.get() == SV("{}")));
-  assert((std::basic_format_string<CharT, int, float>{CSTR("{} {:01.23L}")}.get() == SV("{} {:01.23L}")));
+  assert((std::basic_format_string<CharT, int, char>{CSTR("{} {:*>6}")}.get() == SV("{} {:*>6}")));
 
   // Embedded NUL character
-  assert((std::basic_format_string<CharT, void*, double>{SV("{}\0{}")}.get() == SV("{}\0{}")));
+  assert((std::basic_format_string<CharT, void*, bool>{SV("{}\0{}")}.get() == SV("{}\0{}")));
   return true;
 }
 
diff --git a/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp b/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.fmt.string/types.compile.pass.cpp
@@ -29,12 +29,11 @@
 
 static_assert(std::same_as<std::format_string<>, std::basic_format_string<char>>);
 static_assert(std::same_as<std::format_string<int>, std::basic_format_string<char, int>>);
-static_assert(std::same_as<std::format_string<int, float>, std::basic_format_string<char, int, float>>);
-static_assert(std::same_as<std::format_string<int, float, void*>, std::basic_format_string<char, int, float, void*>>);
+static_assert(std::same_as<std::format_string<int, bool>, std::basic_format_string<char, int, bool>>);
+static_assert(std::same_as<std::format_string<int, bool, void*>, std::basic_format_string<char, int, bool, void*>>);
 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 static_assert(std::same_as<std::wformat_string<>, std::basic_format_string<wchar_t>>);
 static_assert(std::same_as<std::wformat_string<int>, std::basic_format_string<wchar_t, int>>);
-static_assert(std::same_as<std::wformat_string<int, float>, std::basic_format_string<wchar_t, int, float>>);
-static_assert(
-    std::same_as<std::wformat_string<int, float, void*>, std::basic_format_string<wchar_t, int, float, void*>>);
+static_assert(std::same_as<std::wformat_string<int, bool>, std::basic_format_string<wchar_t, int, bool>>);
+static_assert(std::same_as<std::wformat_string<int, bool, void*>, std::basic_format_string<wchar_t, int, bool, void*>>);
 #endif
diff --git a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.compile.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// This test uses std::filesystem::path, which was introduced in macOS 10.15
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+
 // <format>
 
 // template<class T, class charT>
@@ -107,9 +110,7 @@
   assert_is_formattable<__uint128_t, CharT>();
 #endif
 
-  assert_is_formattable<float, CharT>();
-  assert_is_formattable<double, CharT>();
-  assert_is_formattable<long double, CharT>();
+  // floating-point types are tested in concept.formattable.float.compile.pass.cpp
 
   assert_is_formattable<std::nullptr_t, CharT>();
   assert_is_formattable<void*, CharT>();
diff --git a/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/utilities/format/format.formattable/concept.formattable.float.compile.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-format
+
+// <format>
+
+// template<class T, class charT>
+// concept formattable = ...
+
+#include <concepts>
+#include <format>
+
+#include "test_macros.h"
+
+template <class T, class CharT>
+void assert_is_not_formattable() {
+  static_assert(!std::formattable<T, CharT>);
+}
+
+template <class T, class CharT>
+void assert_is_formattable() {
+  // Only formatters for CharT == char || CharT == wchar_t are enabled for the
+  // standard formatters. When CharT is a different type the formatter should
+  // be disabled.
+  if constexpr (std::same_as<CharT, char>
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+                || std::same_as<CharT, wchar_t>
+#endif
+  )
+    static_assert(std::formattable<T, CharT>);
+  else
+    assert_is_not_formattable<T, CharT>();
+}
+
+template <class CharT>
+void test() {
+  assert_is_formattable<float, CharT>();
+  assert_is_formattable<double, CharT>();
+  assert_is_formattable<long double, CharT>();
+}
+
+void test() {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+  test<char8_t>();
+  test<char16_t>();
+  test<char32_t>();
+
+  test<int>();
+}
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/formatter.floating_point.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // [format.formatter.spec]:
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/check_arg_id.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // constexpr void check_arg_id(size_t id);
diff --git a/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp b/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
--- a/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.formatter/format.parse.ctx/next_arg_id.pass.cpp
@@ -9,9 +9,6 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14|15}}
-
 // <format>
 
 // constexpr size_t next_arg_id();
diff --git a/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp b/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/P2418.pass.cpp
@@ -10,6 +10,10 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Tests whether a move only type can be formatted. This is required by
 // P2418R2 "Add support for std::generator-like types to std::format"
 
diff --git a/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp b/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/ascii.pass.cpp
@@ -11,6 +11,10 @@
 // Force unicode to be disabled.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // Tests Unicode is ignored and handled as ASCII.
diff --git a/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp b/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/escaped_output.ascii.pass.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Force unicode to be disabled.
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_HAS_NO_UNICODE
 
diff --git a/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp b/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp
@@ -15,6 +15,10 @@
 // UNSUPPORTED: msvc, target={{.+}}-windows-gnu
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // This test the debug string type for the formatter specializations for char
diff --git a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED:gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.locale.verify.cpp
@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Note this formatter shows additional information when tests are failing.
 // This aids the development. Since other formatters fail in the same fashion
 // they don't have this additional output.
diff --git a/libcxx/test/std/utilities/format/format.functions/format.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format.verify.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out, class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp
@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out, class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to.verify.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // Basic test to validate ill-formed code is properly detected.
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out, class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.locale.verify.cpp
@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out, class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp b/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/format_to_n.verify.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.locale.verify.cpp
@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class... Args>
diff --git a/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp b/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
--- a/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/formatted_size.verify.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // Basic test to validate ill-formed code is properly detected.
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/locale-specific_form.pass.cpp
@@ -12,6 +12,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // REQUIRES: locale.en_US.UTF-8
 
 // <format>
diff --git a/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp b/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/unicode.pass.cpp
@@ -15,6 +15,10 @@
 // UNSUPPORTED msvc, target={{.+}}-windows-gnu
 // UNSUPPORTED: LIBCXX-AIX-FIXME
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // Tests the Unicode width support of the standard format specifiers.
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // string vformat(const locale& loc, string_view fmt, format_args args);
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // string vformat(string_view fmt, format_args args);
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.locale.pass.cpp
@@ -11,6 +11,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out>
diff --git a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
--- a/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.functions/vformat_to.pass.cpp
@@ -10,6 +10,9 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 // <format>
 
 // template<class Out>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_brackets.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtdef/set_separator.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtkind/format_kind.compile.pass.cpp
@@ -8,6 +8,9 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// This test uses std::filesystem::path, which was introduced in macOS 10.15
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+
 // <format>
 
 // template<ranges::input_range R>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.format.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.vformat.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtmap/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.format.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.vformat.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.fmtset/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp
@@ -11,9 +11,8 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_brackets.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/set_separator.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
diff --git a/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp b/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
--- a/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.range/format.range.formatter/underlying.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class T, class charT = char>
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.pass.cpp
@@ -11,9 +11,9 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.format.verify.cpp
@@ -8,6 +8,10 @@
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 // UNSUPPORTED: libcpp-has-no-incomplete-format
 
+// TODO FMT This test should not require std::to_chars(floating-point)
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
+
 #include <format>
 
 #include <utility>
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.functions.vformat.pass.cpp
@@ -10,9 +10,8 @@
 // TODO FMT Evaluate gcc-12 status
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
+// This test requires std::to_chars(floating-point), which is in the dylib
+// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0}}
 
 // <format>
 
diff --git a/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/format.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
@@ -61,7 +57,7 @@
   test(SV("(1)"), std::tuple<int>{1});
   test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
   test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
-  test(SV("(1, 1, 1)"), std::tuple<int, CharT, double>{1, CharT('1'), 1.0});
+  test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
 }
 
 void test() {
diff --git a/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/parse.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
@@ -64,7 +60,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/set_brackets.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // template<class charT, formattable<charT>... Ts>
@@ -49,7 +45,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp b/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
--- a/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
+++ b/libcxx/test/std/utilities/format/format.tuple/set_separator.pass.cpp
@@ -11,10 +11,6 @@
 // TODO FMT Fix this test using GCC, it currently times out.
 // UNSUPPORTED: gcc-12
 
-// This test requires the dylib support introduced in D92214.
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx11.{{.+}}
-
 // <format>
 
 // class range_formatter
@@ -49,7 +45,7 @@
   test<CharT, std::tuple<int>>();
   test<CharT, std::tuple<int, CharT>>();
   test<CharT, std::pair<int, CharT>>();
-  test<CharT, std::tuple<int, CharT, double>>();
+  test<CharT, std::tuple<int, CharT, bool>>();
 }
 
 constexpr bool test() {
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -492,9 +492,6 @@
     PARAMS+=";unwind_runtime_root=${OSX_ROOTS}/macOS/libunwind/${DEPLOYMENT_TARGET}"
     PARAMS+=";use_system_cxx_lib=True"
     PARAMS+=";enable_assertions=True"
-    # TODO: Enable experimental features during back-deployment -- right now some of the availability
-    #       annotations are incorrect, leading to test failures that could be avoided.
-    PARAMS+=";enable_experimental=False"
 
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_CONFIG="apple-libc++-backdeployment.cfg.in" \
@@ -533,9 +530,6 @@
     PARAMS+=";abi_runtime_root=${OSX_ROOTS}/macOS/libc++abi/${DEPLOYMENT_TARGET}"
     PARAMS+=";unwind_runtime_root=${OSX_ROOTS}/macOS/libunwind/${DEPLOYMENT_TARGET}"
     PARAMS+=";use_system_cxx_lib=True"
-    # TODO: Enable experimental features during back-deployment -- right now some of the availability
-    #       annotations are incorrect, leading to test failures that could be avoided.
-    PARAMS+=";enable_experimental=False"
 
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_CONFIG="apple-libc++-backdeployment.cfg.in" \