[gcc r16-6001] libstdc++: Set __cpp_lib_submdspan to 202411.

[Tomasz Kaminski]

https://gcc.gnu.org/g:e2026d74f61c4883d7ac834773ed9dca6d9cc30a

commit r16-6001-ge2026d74f61c4883d7ac834773ed9dca6d9cc30a
Author: Luc Grosheintz <luc.grosheintz@gmail.com>
Date:   Mon Dec 8 21:23:46 2025 +0100

    libstdc++: Set __cpp_lib_submdspan to 202411.
    
    The submdspan feature is complete and this commit sets the feature
    testing macros accordingly. Also makes the feature testing macro
    submdspan depend on constant_wrapper.
    
    Also changes the value of the internal feature testing macro for padded
    layouts to 202403.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/version.def (padded_layouts): Set to 202403.
            (submdspan): Set to 202411 add dependency.
            * include/bits/version.h: Regenerate.
    
    Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
    Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>

Diff:
---
 libstdc++-v3/include/bits/version.def | 6 +++---
 libstdc++-v3/include/bits/version.h   | 7 ++++---
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/include/bits/version.def b/libstdc++-v3/include/bits/version.def
index bbc8d383938f..5c010a4f770e 100644
--- a/libstdc++-v3/include/bits/version.def
+++ b/libstdc++-v3/include/bits/version.def
@@ -1094,17 +1094,17 @@ ftms = {
   name = padded_layouts;
   no_stdname = true; // internal
   values = {
-    v = 1;
+    v = 202403;
     cxxmin = 26;
   };
 };
 
 ftms = {
   name = submdspan;
-  no_stdname = true; // TODO: change once complete
   values = {
-    v = 1;
+    v = 202411;
     cxxmin = 26;
+    extra_cond = "__glibcxx_constant_wrapper >= 202506L";
   };
 };
 
diff --git a/libstdc++-v3/include/bits/version.h b/libstdc++-v3/include/bits/version.h
index 7ee9ae84215e..219f4bb43414 100644
--- a/libstdc++-v3/include/bits/version.h
+++ b/libstdc++-v3/include/bits/version.h
@@ -1214,7 +1214,7 @@
 
 #if !defined(__cpp_lib_padded_layouts)
 # if (__cplusplus >  202302L)
-#  define __glibcxx_padded_layouts 1L
+#  define __glibcxx_padded_layouts 202403L
 #  if defined(__glibcxx_want_all) || defined(__glibcxx_want_padded_layouts)
 #  endif
 # endif
@@ -1222,9 +1222,10 @@
 #undef __glibcxx_want_padded_layouts
 
 #if !defined(__cpp_lib_submdspan)
-# if (__cplusplus >  202302L)
-#  define __glibcxx_submdspan 1L
+# if (__cplusplus >  202302L) && (__glibcxx_constant_wrapper >= 202506L)
+#  define __glibcxx_submdspan 202411L
 #  if defined(__glibcxx_want_all) || defined(__glibcxx_want_submdspan)
+#   define __cpp_lib_submdspan 202411L
 #  endif
 # endif
 #endif /* !defined(__cpp_lib_submdspan) */