https://github.com/llvmbot created
https://github.com/llvm/llvm-project/pull/127732
Backport 2207e3e32549306bf563c6987f790cabe8d4ea78
Requested by: @frederick-vs-ja
>From 3cf1f7f66db80ed3f74b91574d5ed5604fc74b3f Mon Sep 17 00:00:00 2001
From: "A. Jiang" <d...@live.cn>
Date: Wed, 19 Feb 2025 09:06:51 +0800
Subject: [PATCH] [libc++] Set feature-test macro `__cpp_lib_atomic_float`
(#127559)
The corresponding feature was implemented in LLVM 18 (by #67799), but
this FTM wasn't added before.
(cherry picked from commit 2207e3e32549306bf563c6987f790cabe8d4ea78)
---
libcxx/docs/FeatureTestMacroTable.rst | 2 +-
libcxx/docs/Status/Cxx20Papers.csv | 2 +-
libcxx/include/version | 2 +-
.../atomic.version.compile.pass.cpp | 48 ++++++-------------
.../version.version.compile.pass.cpp | 48 ++++++-------------
.../generate_feature_test_macro_components.py | 1 -
6 files changed, 33 insertions(+), 70 deletions(-)
diff --git a/libcxx/docs/FeatureTestMacroTable.rst
b/libcxx/docs/FeatureTestMacroTable.rst
index ccaa784ccb088..dcf9838edd74b 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -174,7 +174,7 @@ Status
----------------------------------------------------------
-----------------
``__cpp_lib_atomic_flag_test`` ``201907L``
----------------------------------------------------------
-----------------
- ``__cpp_lib_atomic_float`` *unimplemented*
+ ``__cpp_lib_atomic_float`` ``201711L``
----------------------------------------------------------
-----------------
``__cpp_lib_atomic_lock_free_type_aliases`` ``201907L``
----------------------------------------------------------
-----------------
diff --git a/libcxx/docs/Status/Cxx20Papers.csv
b/libcxx/docs/Status/Cxx20Papers.csv
index 524c6d0ac8be0..b595da3728841 100644
--- a/libcxx/docs/Status/Cxx20Papers.csv
+++ b/libcxx/docs/Status/Cxx20Papers.csv
@@ -2,7 +2,7 @@
"`P0463R1 <https://wg21.link/P0463R1>`__","Endian just Endian","2017-07
(Toronto)","|Complete|","7",""
"`P0674R1 <https://wg21.link/P0674R1>`__","Extending make_shared to Support
Arrays","2017-07 (Toronto)","|Complete|","15",""
"","","","","",""
-"`P0020R6 <https://wg21.link/P0020R6>`__","Floating Point Atomic","2017-11
(Albuquerque)","|Complete|","18",""
+"`P0020R6 <https://wg21.link/P0020R6>`__","Floating Point Atomic","2017-11
(Albuquerque)","|Complete|","18","The feature-test macro was not set until LLVM
20."
"`P0053R7 <https://wg21.link/P0053R7>`__","C++ Synchronized Buffered
Ostream","2017-11 (Albuquerque)","|Complete|","18",""
"`P0202R3 <https://wg21.link/P0202R3>`__","Add constexpr modifiers to
functions in <algorithm> and <utility> Headers","2017-11
(Albuquerque)","|Complete|","12",""
"`P0415R1 <https://wg21.link/P0415R1>`__","Constexpr for ``std::complex``\
","2017-11 (Albuquerque)","|Complete|","16",""
diff --git a/libcxx/include/version b/libcxx/include/version
index c5966b90c061d..63ead9fd5d29d 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -378,7 +378,7 @@ __cpp_lib_void_t
201411L <type_traits>
# define __cpp_lib_array_constexpr 201811L
# define __cpp_lib_assume_aligned 201811L
# define __cpp_lib_atomic_flag_test 201907L
-// # define __cpp_lib_atomic_float 201711L
+# define __cpp_lib_atomic_float 201711L
# define __cpp_lib_atomic_lock_free_type_aliases 201907L
# define __cpp_lib_atomic_ref 201806L
// # define __cpp_lib_atomic_shared_ptr 201711L
diff --git
a/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
b/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
index 9ed18fbfe19ac..5a21e6320bffe 100644
---
a/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
+++
b/libcxx/test/std/language.support/support.limits/support.limits.general/atomic.version.compile.pass.cpp
@@ -169,17 +169,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++20"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++20"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++20"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++20"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++20"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
@@ -262,17 +256,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++23"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++23"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++23"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++23"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++23"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
@@ -355,17 +343,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++26"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++26"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++26"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++26"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++26"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
diff --git
a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
index 137d6cb428930..1e4465d515e6b 100644
---
a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
+++
b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
@@ -3282,17 +3282,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++20"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++20"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++20"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++20"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++20"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
@@ -4707,17 +4701,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++23"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++23"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++23"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++23"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++23"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
@@ -6369,17 +6357,11 @@
# error "__cpp_lib_atomic_flag_test should have the value 201907L in c++26"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should be defined in c++26"
-# endif
-# if __cpp_lib_atomic_float != 201711L
-# error "__cpp_lib_atomic_float should have the value 201711L in c++26"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_atomic_float
-# error "__cpp_lib_atomic_float should not be defined because it is
unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_atomic_float
+# error "__cpp_lib_atomic_float should be defined in c++26"
+# endif
+# if __cpp_lib_atomic_float != 201711L
+# error "__cpp_lib_atomic_float should have the value 201711L in c++26"
# endif
# ifndef __cpp_lib_atomic_is_always_lock_free
diff --git a/libcxx/utils/generate_feature_test_macro_components.py
b/libcxx/utils/generate_feature_test_macro_components.py
index 00318c2d2a3cd..a26bab8790f6a 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -162,7 +162,6 @@ def add_version_header(tc):
"name": "__cpp_lib_atomic_float",
"values": {"c++20": 201711},
"headers": ["atomic"],
- "unimplemented": True,
},
{
"name": "__cpp_lib_atomic_is_always_lock_free",
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