diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
--- a/libcxx/docs/ReleaseNotes.rst
+++ b/libcxx/docs/ReleaseNotes.rst
@@ -46,6 +46,7 @@
 - P0174R2 (Deprecating Vestigial Library Parts in C++17)
 - N4190 (Removing auto_ptr, random_shuffle(), And Old <functional> Stuff)
 - P0154R1 (Hardware inference size)
+- P0618R0 (Deprecating <codecvt>)
 
 - Marked the following papers as "Complete" (note that some of those might have
   been implemented in a previous release but not marked as such):
@@ -155,6 +156,10 @@
   you have to define ``_LIBCPP_DISABLE_DEPRECATION_WARNINGS``. Note that this disables
   all deprecation warnings.
 
+- The contents of ``<codecvt>``, ``wstring_convert`` and ``wbuffer_convert`` have been marked as deprecated.
+  To disable deprecation warnings you have to define ``_LIBCPP_DISABLE_DEPRECATION_WARNINGS``. Note that this
+  disables all deprecation warnings.
+
 ABI Changes
 -----------
 
diff --git a/libcxx/docs/Status/Cxx17Papers.csv b/libcxx/docs/Status/Cxx17Papers.csv
--- a/libcxx/docs/Status/Cxx17Papers.csv
+++ b/libcxx/docs/Status/Cxx17Papers.csv
@@ -106,7 +106,7 @@
 "`P0599R1 <https://wg21.link/P0599R1>`__","LWG","noexcept for hash functions","Kona","|Complete|","5.0"
 "`P0604R0 <https://wg21.link/P0604R0>`__","LWG","Resolving GB 55, US 84, US 85, US 86","Kona","|Complete|",""
 "`P0607R0 <https://wg21.link/P0607R0>`__","LWG","Inline Variables for the Standard Library","Kona","|In Progress| [#note-P0607]_","6.0"
-"`P0618R0 <https://wg21.link/P0618R0>`__","LWG","Deprecating <codecvt>","Kona","",""
+"`P0618R0 <https://wg21.link/P0618R0>`__","LWG","Deprecating <codecvt>","Kona","|Complete|","15.0"
 "`P0623R0 <https://wg21.link/P0623R0>`__","LWG","Final C++17 Parallel Algorithms Fixes","Kona","",""
 "","","","","",""
 "`P0682R1 <https://wg21.link/P0682R1>`__","LWG","Repairing elementary string conversions","Toronto","",""
diff --git a/libcxx/include/codecvt b/libcxx/include/codecvt
--- a/libcxx/include/codecvt
+++ b/libcxx/include/codecvt
@@ -65,7 +65,7 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-enum codecvt_mode
+enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode
 {
     consume_header = 4,
     generate_header = 2,
@@ -82,17 +82,21 @@
     : public codecvt<wchar_t, char, mbstate_t>
 {
     unsigned long _Maxcode_;
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     codecvt_mode _Mode_;
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     typedef wchar_t   intern_type;
     typedef char      extern_type;
     typedef mbstate_t state_type;
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     _LIBCPP_INLINE_VISIBILITY
     explicit __codecvt_utf8(size_t __refs, unsigned long _Maxcode,
                             codecvt_mode _Mode)
         : codecvt<wchar_t, char, mbstate_t>(__refs), _Maxcode_(_Maxcode),
           _Mode_(_Mode) {}
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
     virtual result
         do_out(state_type& __st,
@@ -189,9 +193,10 @@
     virtual int do_max_length() const _NOEXCEPT;
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
           codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TEMPLATE_VIS codecvt_utf8
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8
     : public __codecvt_utf8<_Elem>
 {
 public:
@@ -202,6 +207,7 @@
     _LIBCPP_INLINE_VISIBILITY
     ~codecvt_utf8() {}
 };
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // codecvt_utf16
 
@@ -213,17 +219,21 @@
     : public codecvt<wchar_t, char, mbstate_t>
 {
     unsigned long _Maxcode_;
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     codecvt_mode _Mode_;
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     typedef wchar_t   intern_type;
     typedef char      extern_type;
     typedef mbstate_t state_type;
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     _LIBCPP_INLINE_VISIBILITY
     explicit __codecvt_utf16(size_t __refs, unsigned long _Maxcode,
                             codecvt_mode _Mode)
         : codecvt<wchar_t, char, mbstate_t>(__refs), _Maxcode_(_Maxcode),
           _Mode_(_Mode) {}
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
     virtual result
         do_out(state_type& __st,
@@ -248,17 +258,21 @@
     : public codecvt<wchar_t, char, mbstate_t>
 {
     unsigned long _Maxcode_;
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     codecvt_mode _Mode_;
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     typedef wchar_t   intern_type;
     typedef char      extern_type;
     typedef mbstate_t state_type;
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     _LIBCPP_INLINE_VISIBILITY
     explicit __codecvt_utf16(size_t __refs, unsigned long _Maxcode,
                             codecvt_mode _Mode)
         : codecvt<wchar_t, char, mbstate_t>(__refs), _Maxcode_(_Maxcode),
           _Mode_(_Mode) {}
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
     virtual result
         do_out(state_type& __st,
@@ -431,9 +445,10 @@
     virtual int do_max_length() const _NOEXCEPT;
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
           codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TEMPLATE_VIS codecvt_utf16
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf16
     : public __codecvt_utf16<_Elem, _Mode & little_endian>
 {
 public:
@@ -444,6 +459,7 @@
     _LIBCPP_INLINE_VISIBILITY
     ~codecvt_utf16() {}
 };
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // codecvt_utf8_utf16
 
@@ -455,17 +471,21 @@
     : public codecvt<wchar_t, char, mbstate_t>
 {
     unsigned long _Maxcode_;
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     codecvt_mode _Mode_;
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 public:
     typedef wchar_t   intern_type;
     typedef char      extern_type;
     typedef mbstate_t state_type;
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
     _LIBCPP_INLINE_VISIBILITY
     explicit __codecvt_utf8_utf16(size_t __refs, unsigned long _Maxcode,
                             codecvt_mode _Mode)
         : codecvt<wchar_t, char, mbstate_t>(__refs), _Maxcode_(_Maxcode),
           _Mode_(_Mode) {}
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 protected:
     virtual result
         do_out(state_type& __st,
@@ -562,9 +582,10 @@
     virtual int do_max_length() const _NOEXCEPT;
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Elem, unsigned long _Maxcode = 0x10ffff,
           codecvt_mode _Mode = (codecvt_mode)0>
-class _LIBCPP_TEMPLATE_VIS codecvt_utf8_utf16
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 codecvt_utf8_utf16
     : public __codecvt_utf8_utf16<_Elem>
 {
 public:
@@ -575,6 +596,7 @@
     _LIBCPP_INLINE_VISIBILITY
     ~codecvt_utf8_utf16() {}
 };
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/libcxx/include/locale b/libcxx/include/locale
--- a/libcxx/include/locale
+++ b/libcxx/include/locale
@@ -3618,7 +3618,7 @@
 template<class _Codecvt, class _Elem = wchar_t,
          class _Wide_alloc = allocator<_Elem>,
          class _Byte_alloc = allocator<char> >
-class _LIBCPP_TEMPLATE_VIS wstring_convert
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 wstring_convert
 {
 public:
     typedef basic_string<char, char_traits<char>, _Byte_alloc>   byte_string;
@@ -3685,6 +3685,7 @@
     state_type state() const {return __cvtstate_;}
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template<class _Codecvt, class _Elem, class _Wide_alloc, class _Byte_alloc>
 inline
 wstring_convert<_Codecvt, _Elem, _Wide_alloc, _Byte_alloc>::
@@ -3692,6 +3693,7 @@
         : __cvtptr_(__pcvt), __cvtstate_(), __cvtcount_(0)
 {
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 template<class _Codecvt, class _Elem, class _Wide_alloc, class _Byte_alloc>
 inline
@@ -3726,6 +3728,7 @@
 
 #endif // _LIBCPP_CXX03_LANG
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template<class _Codecvt, class _Elem, class _Wide_alloc, class _Byte_alloc>
 wstring_convert<_Codecvt, _Elem, _Wide_alloc, _Byte_alloc>::~wstring_convert()
 {
@@ -3737,6 +3740,7 @@
 wstring_convert<_Codecvt, _Elem, _Wide_alloc, _Byte_alloc>::
     from_bytes(const char* __frm, const char* __frm_end)
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     __cvtcount_ = 0;
     if (__cvtptr_ != nullptr)
     {
@@ -3883,7 +3887,7 @@
 }
 
 template <class _Codecvt, class _Elem = wchar_t, class _Tr = char_traits<_Elem> >
-class _LIBCPP_TEMPLATE_VIS wbuffer_convert
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 wbuffer_convert
     : public basic_streambuf<_Elem, _Tr>
 {
 public:
@@ -3960,6 +3964,7 @@
     wbuffer_convert* __close();
 };
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 wbuffer_convert<_Codecvt, _Elem, _Tr>::
     wbuffer_convert(streambuf* __bytebuf, _Codecvt* __pcvt, state_type __state)
@@ -3995,6 +4000,7 @@
 typename wbuffer_convert<_Codecvt, _Elem, _Tr>::int_type
 wbuffer_convert<_Codecvt, _Elem, _Tr>::underflow()
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     if (__cv_ == 0 || __bufptr_ == 0)
         return traits_type::eof();
     bool __initial = __read_mode();
@@ -4059,10 +4065,12 @@
     return __c;
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 typename wbuffer_convert<_Codecvt, _Elem, _Tr>::int_type
 wbuffer_convert<_Codecvt, _Elem, _Tr>::pbackfail(int_type __c)
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     if (__cv_ != 0 && __bufptr_ != 0 && this->eback() < this->gptr())
     {
         if (traits_type::eq_int_type(__c, traits_type::eof()))
@@ -4080,10 +4088,12 @@
     return traits_type::eof();
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 typename wbuffer_convert<_Codecvt, _Elem, _Tr>::int_type
 wbuffer_convert<_Codecvt, _Elem, _Tr>::overflow(int_type __c)
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     if (__cv_ == 0 || __bufptr_ == 0)
         return traits_type::eof();
     __write_mode();
@@ -4142,10 +4152,12 @@
     return traits_type::not_eof(__c);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 basic_streambuf<_Elem, _Tr>*
 wbuffer_convert<_Codecvt, _Elem, _Tr>::setbuf(char_type* __s, streamsize __n)
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     this->setg(0, 0, 0);
     this->setp(0, 0);
     if (__owns_eb_)
@@ -4195,6 +4207,7 @@
     return this;
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 typename wbuffer_convert<_Codecvt, _Elem, _Tr>::pos_type
 wbuffer_convert<_Codecvt, _Elem, _Tr>::seekoff(off_type __off, ios_base::seekdir __way,
@@ -4226,6 +4239,7 @@
 int
 wbuffer_convert<_Codecvt, _Elem, _Tr>::sync()
 {
+_LIBCPP_SUPPRESS_DEPRECATED_POP
     if (__cv_ == 0 || __bufptr_ == 0)
         return 0;
     if (__cm_ & ios_base::out)
@@ -4294,6 +4308,7 @@
     return 0;
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 template <class _Codecvt, class _Elem, class _Tr>
 bool
 wbuffer_convert<_Codecvt, _Elem, _Tr>::__read_mode()
@@ -4348,6 +4363,8 @@
     return __rt;
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_POP
+
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
diff --git a/libcxx/src/locale.cpp b/libcxx/src/locale.cpp
--- a/libcxx/src/locale.cpp
+++ b/libcxx/src/locale.cpp
@@ -1831,6 +1831,7 @@
 // 040000 - 0FFFFF  D8C0 - DBBF, DC00 - DFFF  F1 - F3, 80 - BF, 80 - BF, 80 - BF   786432
 // 100000 - 10FFFF  DBC0 - DBFF, DC00 - DFFF  F4 - F4, 80 - 8F, 80 - BF, 80 - BF    65536
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 static
 codecvt_base::result
 utf16_to_utf8(const uint16_t* frm, const uint16_t* frm_end, const uint16_t*& frm_nxt,
@@ -3204,6 +3205,8 @@
     return static_cast<int>(frm_nxt - frm);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_POP
+
 // template <> class codecvt<char16_t, char, mbstate_t>
 
 locale::id codecvt<char16_t, char, mbstate_t>::id;
@@ -3611,6 +3614,7 @@
 #endif
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf8<wchar_t>::do_max_length() const noexcept
 {
@@ -3693,6 +3697,7 @@
     return utf8_to_ucs2_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf8<char16_t>::do_max_length() const noexcept
 {
@@ -3700,6 +3705,7 @@
         return 6;
     return 3;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf8<char32_t>
 
@@ -3768,6 +3774,7 @@
     return utf8_to_ucs4_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf8<char32_t>::do_max_length() const noexcept
 {
@@ -3775,6 +3782,7 @@
         return 7;
     return 4;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf16<wchar_t, false>
 
@@ -4053,6 +4061,7 @@
     return utf16be_to_ucs2_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf16<char16_t, false>::do_max_length() const noexcept
 {
@@ -4060,6 +4069,7 @@
         return 4;
     return 2;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf16<char16_t, true>
 
@@ -4128,6 +4138,7 @@
     return utf16le_to_ucs2_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf16<char16_t, true>::do_max_length() const noexcept
 {
@@ -4135,6 +4146,7 @@
         return 4;
     return 2;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf16<char32_t, false>
 
@@ -4203,6 +4215,7 @@
     return utf16be_to_ucs4_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf16<char32_t, false>::do_max_length() const noexcept
 {
@@ -4210,6 +4223,7 @@
         return 6;
     return 4;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf16<char32_t, true>
 
@@ -4278,6 +4292,7 @@
     return utf16le_to_ucs4_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf16<char32_t, true>::do_max_length() const noexcept
 {
@@ -4285,6 +4300,7 @@
         return 6;
     return 4;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf8_utf16<wchar_t>
 
@@ -4442,6 +4458,7 @@
     return utf8_to_utf16_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf8_utf16<char16_t>::do_max_length() const noexcept
 {
@@ -4449,6 +4466,7 @@
         return 7;
     return 4;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __codecvt_utf8_utf16<char32_t>
 
@@ -4517,6 +4535,7 @@
     return utf8_to_utf16_length(_frm, _frm_end, mx, _Maxcode_, _Mode_);
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 int
 __codecvt_utf8_utf16<char32_t>::do_max_length() const noexcept
 {
@@ -4524,6 +4543,7 @@
         return 7;
     return 4;
 }
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // __narrow_to_utf8<16>
 
diff --git a/libcxx/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp b/libcxx/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
--- a/libcxx/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
+++ b/libcxx/test/libcxx/localization/locales/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp
@@ -10,6 +10,8 @@
 
 // UNSUPPORTED: c++03
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <locale>
 
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // enum codecvt_mode
 // {
 //     consume_header = 4,
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
@@ -8,6 +8,8 @@
 
 // <codecvt>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template <class Elem, unsigned long Maxcode = 0x10ffff,
 //           codecvt_mode Mode = (codecvt_mode)0>
 // class codecvt_utf8_utf16
diff --git a/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
new file mode 100644
--- /dev/null
+++ b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+// UNSUPPORTED: no-wide-characters
+
+// <codecvt>
+
+// ensure that codecvt content is marked as deprecated
+
+#include <codecvt>
+
+std::codecvt_mode c1; // expected-warning {{'codecvt_mode' is deprecated}}
+std::codecvt_utf8<wchar_t> c2; // expected-warning {{'codecvt_utf8<wchar_t, 1114111, 0>' is deprecated}}
+std::codecvt_utf16<wchar_t> c3; // expected-warning {{'codecvt_utf16<wchar_t, 1114111, 0>' is deprecated}}
+std::codecvt_utf8_utf16<wchar_t> c4; // expected-warning {{'codecvt_utf8_utf16<wchar_t, 1114111, 0>' is deprecated}}
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/ctor.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // wbuffer_convert(streambuf* bytebuf = 0, Codecvt* pcvt = new Codecvt,
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
copy from libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
copy to libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
@@ -6,29 +6,16 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <locale>
-
-// wbuffer_convert<Codecvt, Elem, Tr>
-
-// state_type state() const;
+// UNSUPPORTED: c++03, c++11, c++14
 
 // XFAIL: no-wide-characters
 
-#include <locale>
-#include <codecvt>
-#include <sstream>
-#include <cassert>
+// <codecvt>
 
-#include "test_macros.h"
+// ensure that wbuffer_convert is marked as deprecated
 
-int main(int, char**)
-{
-    typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
-    {
-        B b;
-        std::mbstate_t s = b.state();
-        ((void)s);
-    }
+#include <codecvt>
+#include <locale>
 
-  return 0;
-}
+std::wbuffer_convert<std::codecvt_utf8<wchar_t>> c1; // expected-warning {{'wbuffer_convert<std::codecvt_utf8<wchar_t, 1114111, 0>>' is deprecated}}
+// expected-warning@-1 {{'codecvt_utf8<wchar_t, 1114111, 0>' is deprecated}}
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/overflow.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // int_type overflow(int_type c = traits::eof());
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/pbackfail.pass.cpp
@@ -10,6 +10,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // int_type pbackfail(int_type c = traits::eof());
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/rdbuf.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // streambuf *rdbuf(streambuf *bytebuf);
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // pos_type seekoff(off_type off, ios_base::seekdir way,
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // state_type state() const;
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/test.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // XFAIL: no-wide-characters
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/underflow.pass.cpp
@@ -10,6 +10,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wbuffer_convert<Codecvt, Elem, Tr>
 
 // int_type underflow();
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/converted.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // size_t converted() const;
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // wstring_convert(Codecvt* pcvt = new Codecvt);          // before C++14
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_codecvt_state.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // wstring_convert(Codecvt* pcvt, state_type state);
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_copy.pass.cpp
@@ -12,6 +12,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // wstring_convert(wstring_convert const&) = delete;
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/ctor_err_string.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // wstring_convert(const byte_string& byte_err,
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
copy from libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
copy to libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/state.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
@@ -6,29 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-// <locale>
+// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: no-wide-characters
 
-// wbuffer_convert<Codecvt, Elem, Tr>
+// <codecvt>
 
-// state_type state() const;
+// ensure that wstring_convert is marked as deprecated
 
-// XFAIL: no-wide-characters
-
-#include <locale>
 #include <codecvt>
-#include <sstream>
-#include <cassert>
-
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    typedef std::wbuffer_convert<std::codecvt_utf8<wchar_t> > B;
-    {
-        B b;
-        std::mbstate_t s = b.state();
-        ((void)s);
-    }
+#include <locale>
 
-  return 0;
-}
+std::wstring_convert<std::codecvt_utf8<wchar_t>> c1; // expected-warning {{'wstring_convert<std::codecvt_utf8<wchar_t, 1114111, 0>>' is deprecated}}
+// expected-warning@-1 {{'codecvt_utf8<wchar_t, 1114111, 0>' is deprecated}}
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/from_bytes.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // wide_string from_bytes(char byte);
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/state.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // state_type state() const;
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/to_bytes.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
 
 // byte_string to_bytes(Elem wchar);
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/types.pass.cpp
@@ -8,6 +8,8 @@
 
 // <locale>
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // template<class Codecvt, class Elem = wchar_t,
 //          class Wide_alloc = allocator<Elem>,
 //          class Byte_alloc = allocator<char>>
diff --git a/libcxx/test/support/platform_support.h b/libcxx/test/support/platform_support.h
--- a/libcxx/test/support/platform_support.h
+++ b/libcxx/test/support/platform_support.h
@@ -14,6 +14,8 @@
 #ifndef PLATFORM_SUPPORT_H
 #define PLATFORM_SUPPORT_H
 
+#include "test_macros.h"
+
 // locale names
 #define LOCALE_en_US           "en_US"
 #define LOCALE_en_US_UTF_8     "en_US.UTF-8"
@@ -88,6 +90,7 @@
 #endif
 }
 
+_LIBCPP_SUPPRESS_DEPRECATED_PUSH
 #ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 inline
 std::wstring get_wide_temp_file_name()
@@ -96,6 +99,7 @@
         get_temp_file_name());
 }
 #endif // _LIBCPP_HAS_OPEN_WITH_WCHAR
+_LIBCPP_SUPPRESS_DEPRECATED_POP
 
 #if defined(_CS_GNU_LIBC_VERSION)
 inline bool glibc_version_less_than(char const* version) {