+2023-12-06 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2023-12-05 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/111948
+ * include/bits/ranges_util.h (subrange): Add constructor to
+ _Size to avoid setting member in constructor.
+ * testsuite/std/ranges/subrange/111948.cc: New test.
+
+2023-12-06 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2023-11-13 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/112480
+ * include/std/optional (_Optional_payload_base::_M_reset): Set
+ _M_engaged to false unconditionally.
+
+2023-12-06 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2023-11-11 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/112473
+ * include/bits/utility.h (integer_sequence): Add static_assert.
+ * testsuite/20_util/integer_sequence/112473.cc: New test.
+
+2023-12-06 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2023-12-05 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/112832
+ * include/std/format (formatter::set_debug_format): Ensure this
+ member is defined conditionally for all specializations.
+ * testsuite/std/format/formatter/112832.cc: New test.
+
+2023-12-06 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2023-11-04 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/110133
+ * include/std/system_error (system_error::system_error): Group
+ arguments so that concatenation can reuse rvalue's capacity.
+ * src/c++11/system_error.cc (strerror_string): New function.
+ [_GLIBCXX_HAVE_STRERROR_R] (use_strerror_result): New functions.
+ (generic_error_category::message): Use strerror_string.
+ (system_error_category::message): Likewise.
+
2023-12-05 Jakub Jelinek <jakub@redhat.com>
Backported from master: