+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-18 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/char_traits.h (__gnu_cxx::char_traits::move):
+ Do not compare unrelated pointers during constant evaluation.
+ * testsuite/21_strings/char_traits/requirements/constexpr_functions_c++20.cc:
+ Improve tests for char_traits::move.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103877
+ * doc/xml/faq.xml: Add '-x c++' to preprocessor command.
+ * doc/html/faq.html: Regenerate.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-12-04 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103549
+ * include/bits/regex.h (match_results): Give names to template
+ parameters in first declaration.
+ (match_results::_M_begin): Add default member-initializer.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-30 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103453
+ * config/allocator/malloc_allocator_base.h
+ (_GLIBCXX_SANITIZE_STD_ALLOCATOR): Define for Clang.
+ * config/allocator/new_allocator_base.h
+ (_GLIBCXX_SANITIZE_STD_ALLOCATOR): Likewise.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ * python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Strip
+ versioned namespace from the type name that is printed.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-08-28 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/alloc_traits.h (allocator_traits): Add explicit
+ specialization for allocator<void>. Improve doxygen comments.
+ * include/bits/allocator.h (allocator<void>): Restore for the
+ versioned namespace.
+ (allocator<void>::construct, allocator<void>::destroy): Remove.
+ * include/ext/extptr_allocator.h (_Extptr_allocator<void>):
+ Add default constructor and converting constructor.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-23 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103086
+ * testsuite/libstdc++-prettyprinters/cxx11.cc: Check unique_ptr
+ with non-empty pointer and non-empty deleter.
+
+2022-01-05 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-04 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103086
+ * python/libstdcxx/v6/printers.py (_tuple_impl_get): New helper
+ for accessing the tuple element stored in a _Tuple_impl node.
+ (tuple_get): New function for accessing a tuple element.
+ (unique_ptr_get): New function for accessing a unique_ptr.
+ (UniquePointerPrinter, StdPathPrinter): Use unique_ptr_get.
+ * python/libstdcxx/v6/xmethods.py (UniquePtrGetWorker): Cast
+ tuple to its base class before accessing _M_head_impl.
+
2021-11-26 Jonathan Wakely <jwakely@redhat.com>
Backported from master: