[libc++] [P1612] Add missing feature-test macro __cpp_lib_endian.

Thanks to Marek Kurdej for the patch.

Differential Revision: https://reviews.llvm.org/D70221

6 files changed, 52 insertions, 2 deletions

diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index 2200a998aa4..3dd00fabf62 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -20,7 +20,7 @@ Status
 .. table:: Current Status
      :name: feature-status-table
      :widths: auto
-     
+
     ================================================= =================
     Macro Name                                        Value            
     ================================================= =================
@@ -184,6 +184,8 @@ Status
     ------------------------------------------------- -----------------
     ``__cpp_lib_destroying_delete``                   ``201806L``      
     ------------------------------------------------- -----------------
+    ``__cpp_lib_endian``                              ``201907L``      
+    ------------------------------------------------- -----------------
     ``__cpp_lib_erase_if``                            ``201811L``      
     ------------------------------------------------- -----------------
     ``__cpp_lib_generic_unordered_lookup``            *unimplemented*  
diff --git a/libcxx/include/version b/libcxx/include/version
index fe9cfed876b..2abc71e0f38 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -43,6 +43,7 @@ __cpp_lib_constexpr_misc                                201811L <array> <functio
 __cpp_lib_constexpr_swap_algorithms                     201806L <algorithm>
 __cpp_lib_destroying_delete                             201806L <new>
 __cpp_lib_enable_shared_from_this                       201603L <memory>
+__cpp_lib_endian                                        201907L <bit>
 __cpp_lib_erase_if                                      201811L <string> <deque> <forward_list>
                                                                 <list> <vector> <map>
                                                                 <set> <unordered_map> <unordered_set>
@@ -223,6 +224,7 @@ __cpp_lib_void_t                                        201411L <type_traits>
 # if _LIBCPP_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L
 #   define __cpp_lib_destroying_delete                  201806L
 # endif
+# define __cpp_lib_endian                               201907L
 # define __cpp_lib_erase_if                             201811L
 // # define __cpp_lib_generic_unordered_lookup             201811L
 # define __cpp_lib_interpolate                          201902L
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
index 3e42d06fbe8..4f99d8d86a7 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/bit.version.pass.cpp
@@ -15,6 +15,7 @@
 
 /*  Constant              Value
     __cpp_lib_bit_cast    201806L [C++2a]
+    __cpp_lib_endian      201907L [C++2a]
 */
 
 #include <bit>
@@ -26,18 +27,30 @@
 #   error "__cpp_lib_bit_cast should not be defined before c++2a"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 #elif TEST_STD_VER == 14
 
 # ifdef __cpp_lib_bit_cast
 #   error "__cpp_lib_bit_cast should not be defined before c++2a"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 #elif TEST_STD_VER == 17
 
 # ifdef __cpp_lib_bit_cast
 #   error "__cpp_lib_bit_cast should not be defined before c++2a"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 #elif TEST_STD_VER > 17
 
 # if !defined(_LIBCPP_VERSION)
@@ -53,6 +66,13 @@
 #   endif
 # endif
 
+# ifndef __cpp_lib_endian
+#   error "__cpp_lib_endian should be defined in c++2a"
+# endif
+# if __cpp_lib_endian != 201907L
+#   error "__cpp_lib_endian should have the value 201907L in c++2a"
+# endif
+
 #endif // TEST_STD_VER > 17
 
 int main(int, char**) { return 0; }
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
index 3503051afad..e721b73ed06 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
@@ -37,6 +37,7 @@
     __cpp_lib_constexpr_swap_algorithms            201806L [C++2a]
     __cpp_lib_destroying_delete                    201806L [C++2a]
     __cpp_lib_enable_shared_from_this              201603L [C++17]
+    __cpp_lib_endian                               201907L [C++2a]
     __cpp_lib_erase_if                             201811L [C++2a]
     __cpp_lib_exchange_function                    201304L [C++14]
     __cpp_lib_execution                            201603L [C++17]
@@ -197,6 +198,10 @@
 #   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 # ifdef __cpp_lib_erase_if
 #   error "__cpp_lib_erase_if should not be defined before c++2a"
 # endif
@@ -537,6 +542,10 @@
 #   error "__cpp_lib_enable_shared_from_this should not be defined before c++17"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 # ifdef __cpp_lib_erase_if
 #   error "__cpp_lib_erase_if should not be defined before c++2a"
 # endif
@@ -994,6 +1003,10 @@
 #   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++17"
 # endif
 
+# ifdef __cpp_lib_endian
+#   error "__cpp_lib_endian should not be defined before c++2a"
+# endif
+
 # ifdef __cpp_lib_erase_if
 #   error "__cpp_lib_erase_if should not be defined before c++2a"
 # endif
@@ -1682,6 +1695,13 @@
 #   error "__cpp_lib_enable_shared_from_this should have the value 201603L in c++2a"
 # endif
 
+# ifndef __cpp_lib_endian
+#   error "__cpp_lib_endian should be defined in c++2a"
+# endif
+# if __cpp_lib_endian != 201907L
+#   error "__cpp_lib_endian should have the value 201907L in c++2a"
+# endif
+
 # ifndef __cpp_lib_erase_if
 #   error "__cpp_lib_erase_if should be defined in c++2a"
 # endif
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index b1721938c60..a6191a50899 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -580,6 +580,12 @@ feature_test_macros = sorted([ add_version_header(x) for x in [
    },
    "headers": ["numeric"],
    },
+  {"name": "__cpp_lib_endian",
+   "values": {
+     "c++2a": int(201907),
+   },
+   "headers": ["bit"],
+   },
 ]], key=lambda tc: tc["name"])
 
 def get_std_dialects():
diff --git a/libcxx/www/cxx2a_status.html b/libcxx/www/cxx2a_status.html
index 995e1614b38..cf2e397d0ca 100644
--- a/libcxx/www/cxx2a_status.html
+++ b/libcxx/www/cxx2a_status.html
@@ -181,7 +181,7 @@
 	<tr><td><a href="https://wg21.link/P1502">P1502</a></td><td>LWG</td><td>Standard library header units for C++20</td><td>Cologne</td><td></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P1522">P1522</a></td><td>LWG</td><td>Iterator Difference Type and Integer Overflow</td><td>Cologne</td><td></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P1523">P1523</a></td><td>LWG</td><td>Views and Size Types</td><td>Cologne</td><td></td><td></td></tr>
-	<tr><td><a href="https://wg21.link/P1612">P1612</a></td><td>LWG</td><td>Relocate Endian’s Specification</td><td>Cologne</td><td></td><td></td></tr>
+	<tr><td><a href="https://wg21.link/P1612">P1612</a></td><td>LWG</td><td>Relocate Endian’s Specification</td><td>Cologne</td><td>Complete</td><td>10.0</td></tr>
 	<tr><td><a href="https://wg21.link/P1614">P1614</a></td><td>LWG</td><td>The Mothership has Landed</td><td>Cologne</td><td></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P1638">P1638</a></td><td>LWG</td><td>basic_istream_view::iterator should not be copyable</td><td>Cologne</td><td></td><td></td></tr>
 	<tr><td><a href="https://wg21.link/P1643">P1643</a></td><td>LWG</td><td>Add wait/notify to atomic_ref</td><td>Cologne</td><td></td><td></td></tr>