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Author: H-G-Hristov

libcxx/docs/FeatureTestMacroTable.rst

@@ -390,7 +390,7 @@ Status
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_reference_from_temporary``                     *unimplemented*
     ---------------------------------------------------------- -----------------
-    ``__cpp_lib_spanstream``                                   ``202106L``
+    ``__cpp_lib_spanstream``                                   *unimplemented*
     ---------------------------------------------------------- -----------------
     ``__cpp_lib_stacktrace``                                   *unimplemented*
     ---------------------------------------------------------- -----------------

libcxx/include/version

@@ -523,7 +523,7 @@ __cpp_lib_void_t                                        201411L <type_traits>
 # define __cpp_lib_ranges_to_container                  202202L
 // # define __cpp_lib_ranges_zip                           202110L
 // # define __cpp_lib_reference_from_temporary             202202L
-# define __cpp_lib_spanstream                           202106L
+// # define __cpp_lib_spanstream                           202106L
 // # define __cpp_lib_stacktrace                           202011L
 # define __cpp_lib_stdatomic_h                          202011L
 # define __cpp_lib_string_contains                      202011L

libcxx/modules/std.compat.cppm.in

@@ -68,6 +68,9 @@ module;
 #  if __has_include(<rcu>)
 #    error "please update the header information for <rcu> in headers_not_available in utils/libcxx/header_information.py"
 #  endif // __has_include(<rcu>)
+#  if __has_include(<spanstream>)
+#    error "please update the header information for <spanstream> in headers_not_available in utils/libcxx/header_information.py"
+#  endif // __has_include(<spanstream>)
 #  if __has_include(<stacktrace>)
 #    error "please update the header information for <stacktrace> in headers_not_available in utils/libcxx/header_information.py"
 #  endif // __has_include(<stacktrace>)

libcxx/modules/std.cppm.in

@@ -181,6 +181,9 @@ module;
 #  if __has_include(<rcu>)
 #    error "please update the header information for <rcu> in headers_not_available in utils/libcxx/header_information.py"
 #  endif // __has_include(<rcu>)
+#  if __has_include(<spanstream>)
+#    error "please update the header information for <spanstream> in headers_not_available in utils/libcxx/header_information.py"
+#  endif // __has_include(<spanstream>)
 #  if __has_include(<stacktrace>)
 #    error "please update the header information for <stacktrace> in headers_not_available in utils/libcxx/header_information.py"
 #  endif // __has_include(<stacktrace>)

libcxx/test/std/language.support/support.limits/support.limits.general/spanstream.version.compile.pass.cpp

@@ -5807,11 +5807,17 @@
 #    error "__cpp_lib_span_initializer_list should not be defined before c++26"
 #  endif
 
-#  ifndef __cpp_lib_spanstream
-#    error "__cpp_lib_spanstream should be defined in c++23"
-#  endif
-#  if __cpp_lib_spanstream != 202106L
-#    error "__cpp_lib_spanstream should have the value 202106L in c++23"
+#  if !defined(_LIBCPP_VERSION)
+#    ifndef __cpp_lib_spanstream
+#      error "__cpp_lib_spanstream should be defined in c++23"
+#    endif
+#    if __cpp_lib_spanstream != 202106L
+#      error "__cpp_lib_spanstream should have the value 202106L in c++23"
+#    endif
+#  else
+#    ifdef __cpp_lib_spanstream
+#      error "__cpp_lib_spanstream should not be defined because it is unimplemented in libc++!"
+#    endif
 #  endif
 
 #  ifndef __cpp_lib_ssize
@@ -7738,11 +7744,17 @@
 #    error "__cpp_lib_span_initializer_list should have the value 202311L in c++26"
 #  endif
 
-#  ifndef __cpp_lib_spanstream
-#    error "__cpp_lib_spanstream should be defined in c++26"
-#  endif
-#  if __cpp_lib_spanstream != 202106L
-#    error "__cpp_lib_spanstream should have the value 202106L in c++26"
+#  if !defined(_LIBCPP_VERSION)
+#    ifndef __cpp_lib_spanstream
+#      error "__cpp_lib_spanstream should be defined in c++26"
+#    endif
+#    if __cpp_lib_spanstream != 202106L
+#      error "__cpp_lib_spanstream should have the value 202106L in c++26"
+#    endif
+#  else
+#    ifdef __cpp_lib_spanstream
+#      error "__cpp_lib_spanstream should not be defined because it is unimplemented in libc++!"
+#    endif
 #  endif
 
 #  ifndef __cpp_lib_ssize

libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp

@@ -1269,6 +1269,7 @@ def add_version_header(tc):
             "name": "__cpp_lib_spanstream",
             "values": {"c++23": 202106},
             "headers": ["spanstream"],
+            "unimplemented": True,
         },
         {
             "name": "__cpp_lib_ssize",

libcxx/utils/generate_feature_test_macro_components.py

@@ -169,6 +169,7 @@ def __hash__(self) -> int:
     "inplace_vector",
     "linalg",
     "rcu",
+    "spanstream",
     "stacktrace",
     "stdfloat",
     "text_encoding",