[libcxx-commits] [libcxx] [libc++] Removes codecvt. (PR #72496)
Mark de Wever via libcxx-commits
libcxx-commits at lists.llvm.org
Wed Nov 22 11:49:53 PST 2023
https://github.com/mordante updated https://github.com/llvm/llvm-project/pull/72496
>From 981f5343fffea6c911cb0d4ea4745e58d421080c Mon Sep 17 00:00:00 2001
From: Mark de Wever <koraq at xs4all.nl>
Date: Tue, 14 Nov 2023 19:16:33 +0100
Subject: [PATCH] [libc++] Removes codecvt.
Implements:
- P2871R3 Remove Deprecated Unicode Conversion Facets from C++26
---
libcxx/docs/ReleaseNotes/18.rst | 5 +++++
libcxx/docs/Status/Cxx2cPapers.csv | 2 +-
libcxx/docs/UsingLibcxx.rst | 7 +++++++
libcxx/include/codecvt | 4 ++++
libcxx/modules/std/codecvt.inc | 2 ++
.../conversions.string/ctor_move.pass.cpp | 2 +-
.../ifstream.members/buffered_reads.pass.cpp | 2 +-
.../ofstream.members/buffered_writes.pass.cpp | 2 +-
.../utf_sanity_check.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_mode.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf16.pass.cpp | 2 +-
.../codecvt_utf16_always_noconv.pass.cpp | 2 +-
.../codecvt_utf16_encoding.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf16_in.pass.cpp | 2 +-
.../codecvt_utf16_length.pass.cpp | 2 +-
.../codecvt_utf16_max_length.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf16_out.pass.cpp | 2 +-
.../codecvt_utf16_unshift.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf8.pass.cpp | 2 +-
.../codecvt_utf8_always_noconv.pass.cpp | 2 +-
.../codecvt_utf8_encoding.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf8_in.pass.cpp | 2 +-
.../codecvt_utf8_length.pass.cpp | 2 +-
.../codecvt_utf8_max_length.pass.cpp | 2 +-
.../locale.stdcvt/codecvt_utf8_out.pass.cpp | 2 +-
.../codecvt_utf8_unshift.pass.cpp | 2 +-
.../codecvt_utf8_utf16_always_noconv.pass.cpp | 2 +-
.../codecvt_utf8_utf16_encoding.pass.cpp | 2 +-
.../codecvt_utf8_utf16_in.pass.cpp | 2 +-
.../codecvt_utf8_utf16_length.pass.cpp | 2 +-
.../codecvt_utf8_utf16_max_length.pass.cpp | 2 +-
.../codecvt_utf8_utf16_out.pass.cpp | 2 +-
.../codecvt_utf8_utf16_unshift.pass.cpp | 2 +-
.../locale.stdcvt/depr.verify.cpp | 5 +++--
.../locale.stdcvt/remove.verify.cpp | 21 +++++++++++++++++++
.../conversions.buffer/ctor.pass.cpp | 2 +-
.../conversions.buffer/depr.verify.cpp | 2 +-
.../conversions.buffer/overflow.pass.cpp | 2 +-
.../conversions.buffer/pbackfail.pass.cpp | 2 +-
.../conversions.buffer/rdbuf.pass.cpp | 2 +-
.../conversions.buffer/state.pass.cpp | 2 +-
.../conversions.buffer/test.pass.cpp | 2 +-
.../conversions.buffer/underflow.pass.cpp | 2 +-
.../conversions.string/converted.pass.cpp | 2 +-
.../conversions.string/ctor_codecvt.pass.cpp | 2 +-
.../ctor_codecvt_state.pass.cpp | 2 +-
.../conversions.string/ctor_copy.pass.cpp | 2 +-
.../ctor_err_string.pass.cpp | 2 +-
.../conversions.string/depr.verify.cpp | 2 +-
.../conversions.string/from_bytes.pass.cpp | 2 +-
.../conversions.string/state.pass.cpp | 2 +-
.../conversions.string/to_bytes.pass.cpp | 2 +-
.../conversions.string/types.pass.cpp | 2 +-
53 files changed, 89 insertions(+), 49 deletions(-)
create mode 100644 libcxx/test/std/localization/locale.stdcvt/remove.verify.cpp
diff --git a/libcxx/docs/ReleaseNotes/18.rst b/libcxx/docs/ReleaseNotes/18.rst
index d5df7fde5be91af..0d8d8df273cd42f 100644
--- a/libcxx/docs/ReleaseNotes/18.rst
+++ b/libcxx/docs/ReleaseNotes/18.rst
@@ -48,6 +48,7 @@ Implemented Papers
- P2538R1 - ADL-proof ``std::projected``
- P2614R2 - Deprecate ``numeric_limits::has_denorm``
- P0053R7 - C++ Synchronized Buffered Ostream (in the experimental library)
+- P2871R3 - Remove Deprecated Unicode Conversion Facets from C++26
Improvements and New Features
@@ -68,6 +69,10 @@ Improvements and New Features
on a per translation unit basis using the ``_LIBCPP_HARDENING_MODE`` macro. See :ref:`the hardening documentation
<using-hardening-modes>` for more details.
+- The ``_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT`` macro has been added to make
+ the declarations in ``<codecvt>`` available.
+
+
Deprecations and Removals
-------------------------
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index eb5398f66d0e0c1..63ea9a79534bf92 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -38,7 +38,7 @@
"`P2821R5 <https://wg21.link/P2821R5>`__","LWG","``span.at()``","Kona November 2023","","",""
"`P2868R3 <https://wg21.link/P2868R3>`__","LWG","Remove Deprecated ``std::allocator`` Typedef From C++26","Kona November 2023","","",""
"`P2870R3 <https://wg21.link/P2870R3>`__","LWG","Remove ``basic_string::reserve()`` From C++26","Kona November 2023","","",""
-"`P2871R3 <https://wg21.link/P2871R3>`__","LWG","Remove Deprecated Unicode Conversion Facets from C++26","Kona November 2023","","",""
+"`P2871R3 <https://wg21.link/P2871R3>`__","LWG","Remove Deprecated Unicode Conversion Facets from C++26","Kona November 2023","|Complete|","18.0",""
"`P2819R2 <https://wg21.link/P2819R2>`__","LWG","Add tuple protocol to complex","Kona November 2023","","",""
"`P2937R0 <https://wg21.link/P2937R0>`__","LWG","Freestanding: Remove ``strtok``","Kona November 2023","","",""
"`P2833R2 <https://wg21.link/P2833R2>`__","LWG","Freestanding Library: inout expected span","Kona November 2023","","",""
diff --git a/libcxx/docs/UsingLibcxx.rst b/libcxx/docs/UsingLibcxx.rst
index 24d6a7b95f5b2e4..5e2b5ee745d1d58 100644
--- a/libcxx/docs/UsingLibcxx.rst
+++ b/libcxx/docs/UsingLibcxx.rst
@@ -329,6 +329,13 @@ C++20 Specific Configuration Macros
`result_of` and `result_of_t`.
+C++26 Specific Configuration Macros
+-----------------------------------
+
+**_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT**:
+ This macro is used to re-enable all named declarations in ``<codecvt>``.
+
+
Libc++ Extensions
=================
diff --git a/libcxx/include/codecvt b/libcxx/include/codecvt
index 7a8c28d55941524..7a363280d52127c 100644
--- a/libcxx/include/codecvt
+++ b/libcxx/include/codecvt
@@ -63,6 +63,8 @@ class codecvt_utf8_utf16
# pragma GCC system_header
#endif
+#if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+
_LIBCPP_BEGIN_NAMESPACE_STD
enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode
@@ -553,6 +555,8 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
_LIBCPP_END_NAMESPACE_STD
+#endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+
#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <atomic>
# include <concepts>
diff --git a/libcxx/modules/std/codecvt.inc b/libcxx/modules/std/codecvt.inc
index 996036822bb40a0..277ef046349a9e0 100644
--- a/libcxx/modules/std/codecvt.inc
+++ b/libcxx/modules/std/codecvt.inc
@@ -9,10 +9,12 @@
export namespace std {
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
+# if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
using std::codecvt_mode;
using std::codecvt_utf16;
using std::codecvt_utf8;
using std::codecvt_utf8_utf16;
+# endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
#endif // _LIBCPP_HAS_NO_LOCALIZATION
} // namespace std
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
index 61e92089e4659c3..006bece21105b1a 100644
--- 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
@@ -10,7 +10,7 @@
// UNSUPPORTED: c++03
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// <locale>
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/buffered_reads.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/buffered_reads.pass.cpp
index 699e6c20160febf..d57b7c20a2da272 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/buffered_reads.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/buffered_reads.pass.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// UNSUPPORTED: c++03
// <fstream>
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/buffered_writes.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/buffered_writes.pass.cpp
index 4aeaa42c18adeb7..e7820739505106a 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/buffered_writes.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/buffered_writes.pass.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// UNSUPPORTED: c++03
// <fstream>
diff --git a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
index 07789cadbf6a0a9..62fce70052c2a02 100644
--- a/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
+++ b/libcxx/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/utf_sanity_check.pass.cpp
@@ -9,7 +9,7 @@
// XFAIL: availability-char8_t_support-missing
// This test runs in C++20, but we have deprecated codecvt<char(16|32), char, mbstate_t> in C++20.
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// <locale>
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
index b7020ac0f161a90..a8a05da969da897 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_mode.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// enum codecvt_mode
// {
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
index c38f11df5ac4d64..229c634116796ff 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index f91706c77d25d67..ecf9b670895d3dd 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 12bfa096924b6fc..9e16daa221fb080 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 8d4f48e8f54ddcf..f9dc6f0920355b9 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index bf2f8af6e842800..68898957599f3d1 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index e9c19e51b24e621..3a5f1e972b0d080 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 24b1d22881b4754..951e9cb51de7096 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 55cbf5a7d0717ed..fa6af0a7f3120a0 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
diff --git a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
index 1f06de27d9aec0c..effd8d5317eadd3 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index f25c8e45451054e..f6bb25b41acf0ff 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 55c1c5e52f766fa..25f308170a79b9c 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 9abd0868f40a783..7f56bc0073ad90e 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 0d52894282bd0d1..bea2ba3d15768aa 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 32fdde30153ec80..41e9e5cc5654ff8 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 22636ca08980c2d..b6f872e9068c1cc 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 9ab9629978224ce..7bc4d02bf82374e 100644
--- a/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 97d7ef2301702ba..82b99a38de1a7a2 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index f0514b51cedb705..2bb6f7b9ccc0095 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 24eb2dff6182c7f..0cf6290418daa14 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 03f813719acdc06..3fcf8e5b2dc522d 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index c59e8e803501771..06503cbd725af05 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index b9eeb6adc9c86b6..006d9839689f8e6 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
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
index 6db92c5b6a0754a..f1b01ee05633f81 100644
--- 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
@@ -8,7 +8,7 @@
// <codecvt>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
diff --git a/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
index d0f58777d39c316..b3c6fc8674f8a25 100644
--- a/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
+++ b/libcxx/test/std/localization/locale.stdcvt/depr.verify.cpp
@@ -6,12 +6,13 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: c++03, c++11, c++14, c++26
// UNSUPPORTED: no-wide-characters
// <codecvt>
-// ensure that codecvt content is marked as deprecated
+// Ensure that codecvt content is marked as deprecated.
+// The header has been removed in C++26.
#include <codecvt>
diff --git a/libcxx/test/std/localization/locale.stdcvt/remove.verify.cpp b/libcxx/test/std/localization/locale.stdcvt/remove.verify.cpp
new file mode 100644
index 000000000000000..4ea3b3a0baf4f45
--- /dev/null
+++ b/libcxx/test/std/localization/locale.stdcvt/remove.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, c++17, c++20, c++23
+// UNSUPPORTED: no-wide-characters
+
+// <codecvt>
+
+// Ensure that codecvt content is marked as removed.
+
+#include <codecvt>
+
+std::codecvt_mode c1; // expected-error {{no type named 'codecvt_mode' in namespace 'std'}}
+std::codecvt_utf8<wchar_t> c2; // expected-error {{no template named 'codecvt_utf8' in namespace 'std'}}
+std::codecvt_utf16<wchar_t> c3; // expected-error {{no template named 'codecvt_utf16' in namespace 'std'}}
+std::codecvt_utf8_utf16<wchar_t> c4; // expected-error {{no template named 'codecvt_utf8_utf16' in namespace 'std'}}
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
index 5846e4e72a843ea..e99a85a87398117 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
index 54819c666392734..cb067e99a4764be 100644
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/depr.verify.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: c++03, c++11, c++14, c++26
// XFAIL: no-wide-characters
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
index 198007e9f91d043..5a5a3f5a3462be0 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index e8e4953426741da..926f661a2d44edc 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index c9c134592bf6b68..cdbabafcdf5a739 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index 57058d148feec29..fe77d9b3bcc85d7 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index b37424bb5595eed..01a112e03e8e967 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index 32a3b18dda030dc..0e6f77fff9d1fc4 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wbuffer_convert<Codecvt, Elem, Tr>
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
index 2861e4a52036efd..9627d2ca3312b43 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 8c0321049663dfa..76ccd1ac9f6de94 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 5032a301506d4b4..454576d8035d39a 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index d3117d3ef6d0651..3d7d8c601c1bf9a 100644
--- 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
@@ -12,7 +12,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 3f74bbfa37d8d1b..e5da324196ff1c0 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
index f44a8af3d9365c2..c520d34a23802b0 100644
--- a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.string/depr.verify.cpp
@@ -6,7 +6,7 @@
//
//===----------------------------------------------------------------------===//
-// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: c++03, c++11, c++14, c++26
// UNSUPPORTED: no-wide-characters
// <codecvt>
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
index ac614b087b90a66..f745cbc202d6279 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 3bf3736a7bcefa4..d7e1989e6a17281 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 4f3b9318c2f35c3..19ffdd57d2ecc9f 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// wstring_convert<Codecvt, Elem, Wide_alloc, Byte_alloc>
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
index 0ea13e2ce38362e..1987a06a9048d49 100644
--- 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
@@ -8,7 +8,7 @@
// <locale>
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -D_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT
// template<class Codecvt, class Elem = wchar_t,
// class Wide_alloc = allocator<Elem>,
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