[gcc r16-8175] libstdc++: Export std::allocation_result in std.cc [PR118030]

[Jakub Jelinek]

https://gcc.gnu.org/g:a51dbc0cdcafcd051ac1b9ee230d31e7897d0bb0

commit r16-8175-ga51dbc0cdcafcd051ac1b9ee230d31e7897d0bb0
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Mar 19 16:11:14 2026 +0100

    libstdc++: Export std::allocation_result in std.cc [PR118030]
    
    allocation_result has been added in PR118030 P0401 r16-7986 but
    not exported in std module.
    
    2026-03-19  Jakub Jelinek  <jakub@redhat.com>
    
            PR libstdc++/118030
            * src/c++23/std.cc.in: Add allocation_result.

Diff:
---
 libstdc++-v3/src/c++23/std.cc.in | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/src/c++23/std.cc.in b/libstdc++-v3/src/c++23/std.cc.in
index 75273ce56c5d..5b0e5c4debd2 100644
--- a/libstdc++-v3/src/c++23/std.cc.in
+++ b/libstdc++-v3/src/c++23/std.cc.in
@@ -2055,6 +2055,9 @@ export namespace std
   using std::start_lifetime_as;
   using std::start_lifetime_as_array;
 #endif
+#ifdef __glibcxx_allocate_at_least
+  using std::allocation_result;
+#endif
 }
 
 // 20.4 <memory_resource>