+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-05-06 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/105502
+ * include/bits/random.tcc
+ (operator>>(basic_istream<C,T>&, normal_distribution<R>&)):
+ Update state when __state_avail is false.
+ * testsuite/26_numerics/random/normal_distribution/operators/serialize.cc:
+ Check that deserialized object equals serialized one.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-11-26 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/27_io/types/1.cc: Add c++11 target selector to
+ warnings.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-02-04 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/experimental/bits/fs_ops.h (fs::copy_file): Remove
+ noexcept.
+ (fs::create_directories): Likewise.
+ (fs::remove_all): Likewise.
+ * src/filesystem/ops.cc (fs::copy_file): Remove noexcept.
+ (fs::create_directories): Likewise.
+ (fs::remove_all): Likewise.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-12-09 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103630
+ * libsupc++/exception_ptr.h (make_exception_ptr): Decay the
+ template parameter. Use typeid of the static type.
+ * testsuite/18_support/exception_ptr/103630.cc: New test.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2020-12-17 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93151
+ * config/os/djgpp/error_constants.h: Test POSIX errno macros
+ directly, instead of corresponding _GLIBCXX_HAVE_EXXX macros.
+ * config/os/mingw32-w64/error_constants.h: Likewise.
+ * config/os/mingw32/error_constants.h: Likewise.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2020-12-16 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/93151
+ * acinclude.m4 (GLIBCXX_CHECK_SYSTEM_ERROR): Remove.
+ * config.h.in: Regenerate.
+ * configure: Regenerate.
+ * configure.ac (GLIBCXX_CHECK_SYSTEM_ERROR): Do not use.
+ * config/os/generic/error_constants.h: Test POSIX errno macros
+ directly, instead of corresponding _GLIBCXX_HAVE_EXXX macros.
+ * testsuite/19_diagnostics/headers/system_error/errc_std_c++0x.cc:
+ Likewise.
+ * testsuite/19_diagnostics/headers/system_error/93151.cc: New
+ test.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-05-04 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/bits/basic_string.h (basic_string(const CharT*, const A&)):
+ Do not do arithmetic on null pointer.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-08-12 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/101870
+ * include/c_global/cmath (hypot): Use __promoted_t.
+ (lerp): Add new overload accepting any arithmetic types.
+ * include/ext/type_traits.h (__promoted_t): New alias template.
+ * testsuite/26_numerics/lerp.cc: Moved to...
+ * testsuite/26_numerics/lerp/1.cc: ...here.
+ * testsuite/26_numerics/lerp/constexpr.cc: New test.
+ * testsuite/26_numerics/lerp/version.cc: New test.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-10-01 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/100153
+ * include/bits/vector.tcc (vector<bool>::_M_shrink_to_fit()):
+ When size() is zero just deallocate and reset.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2021-10-01 Jonathan Wakely <jwakely@redhat.com>
+
+ * testsuite/25_algorithms/is_permutation/2.cc: Include <iterator>.
+
+2022-05-09 Pavel I. Kryukov <pavel.kryukov@phystech.edu>
+
+ Backported from master:
+ 2022-01-06 Pavel I. Kryukov <pavel.kryukov@phystech.edu>
+ Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103853
+ * include/bits/forward_list.tcc (forward_list::merge): Check for
+ self-merge.
+ * testsuite/23_containers/forward_list/operations/merge.cc: New test.
+
+2022-05-09 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.
+
+2022-05-09 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.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-01-17 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/103650
+ * include/Makefile.am: Rename LT_OBJDIR and STDC_HEADERS.
+ * include/Makefile.in: Regenerate.
+ * testsuite/17_intro/headers/c++1998/103650.cc: New test.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-04-01 Jonathan Wakely <jwakely@redhat.com>
+
+ * include/experimental/bits/fs_fwd.h (copy_file): Remove
+ incorrect noexcept from declaration.
+ * include/experimental/bits/fs_path.h (path::begin, path::end):
+ Add noexcept to declarations, to match definitions.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-04-14 Jonathan Wakely <jwakely@redhat.com>
+
+ * doc/xml/manual/intro.xml: Fix comment.
+
+2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ Backported from master:
+ 2022-05-09 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/102048
+ * include/ext/rope (rope::erase(size_type)): Deprecate broken
+ function.
+
2021-11-23 Jonathan Wakely <jwakely@redhat.com>
Backported from master: