[gcc r15-10618] Daily bump.

[GCC Administrator]

https://gcc.gnu.org/g:0c1049091681a35b775420cfd564d5ee613a9128

commit r15-10618-g0c1049091681a35b775420cfd564d5ee613a9128
Author: GCC Administrator <gccadmin@gcc.gnu.org>
Date:   Thu Dec 18 00:20:41 2025 +0000

    Daily bump.

Diff:
---
 gcc/DATESTAMP          |  2 +-
 libstdc++-v3/ChangeLog | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index f9e8e911bab6..0488a44f70fb 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20251217
+20251218
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 1d8ff988b448..69089529ef29 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,55 @@
+2025-12-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2025-12-16  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/std/chrono (chrono::__detail::__get_leap_second_info):
+	Update expiry date for leap seconds list.
+	* src/c++20/tzdb.cc (tzdb_list::_Node::_S_read_leap_seconds):
+	Likewise.
+	* src/c++20/tzdata.zi: Import new file from 2025c release.
+
+2025-12-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2025-12-16  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/122907
+	* include/bits/cpp_type_traits.h (__memcpyable_integer<bool>):
+	Define as false.
+	* testsuite/25_algorithms/copy/122907.cc: New test.
+
+2025-12-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2025-12-06  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/atomic_wait.h (__detail::__atomic_compare): Use
+	std::addressof instead of &.
+	* include/std/atomic (atomic::wait, atomic::notify_one)
+	(atomic::notify_all): Likewise.
+
+2025-12-17  Vladimir Bespalov  <vlad.bespalov@jetstreamsoft.com>
+
+	Backported from master:
+	2025-12-03  Vladimir Bespalov  <vlad.bespalov@jetstreamsoft.com>
+
+	PR libstdc++/122812
+	* python/libstdcxx/v6/printers.py (lookup_templ_spec): Use
+	gdb.Type.tag if present.
+
+2025-12-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2025-11-27  Jonathan Wakely  <jwakely@redhat.com>
+
+	* testsuite/performance/23_containers/sort_search/list.cc: Cast
+	results to void to suppress -Wunused-result warnings from
+	nodiscard functions.
+	* testsuite/performance/25_algorithms/equal_deque_iterators.cc:
+	Likewise.
+	* testsuite/performance/25_algorithms/search_n.cc: Likewise.
+
 2025-12-16  Patrick Palka  <ppalka@redhat.com>
 
 	Backported from master: