This incorporates:
2020-08-16 time_rz: remove unused functions
2020-08-16 time_rz: fix issues with mktime_z failures
2020-08-16 nstrftime: Guide inlining also on clang
2020-08-16 intprops: Avoid bogus warning on clang
2020-08-16 libc-config: Enable __REDIRECT macro also on clang
2020-08-16 regex: Use initializer shorthand syntax also with clang
2020-08-16 regex: Use space optimization also with clang
2020-08-16 Use _Static_assert and static_assert when present on clang
2020-08-16 Use 'throw ()' for optimization in C++ mode also on clang
2020-08-16 stdio: Don't break attribute 'scanf' on clang
2020-08-16 Fix "warning: 'format' attribute ...: rpl_printf"
2020-08-16 Fix "warning: attribute declaration must precede definition"
2020-08-16 Fix undesired warnings
2020-08-16 Don't use Autoconf quadrigraphsxo
2020-08-16 Fix quoting of AC_LANG_PROGRAM arguments
2020-08-16 Assume autoconf >= 2.64
2020-08-15 nstrftime: be more predictable about errno
2020-08-15 canonicalize: Fix autoconf test on MSVC/clang
2020-08-15 Support compiling without -loldnames on native Windows
2020-08-14 mktime, mktime-internal: Remove obsolete code
2020-08-14 Assume tzset exists
* lib/c++defs.h, lib/canonicalize-lgpl.c, lib/cdefs.h, lib/dup2.c:
* lib/fcntl.in.h, lib/getopt-cdefs.in.h, lib/intprops.h, lib/md5.h:
* lib/mktime.c, lib/nstrftime.c, lib/open.c, lib/regcomp.c:
* lib/regex_internal.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/strftime.h, lib/string.in.h, lib/sys_select.in.h:
* lib/sys_stat.in.h, lib/sys_time.in.h, lib/time.in.h, lib/time_rz.c:
* lib/unistd.in.h, lib/verify.h, m4/00gnulib.m4:
* m4/absolute-header.m4, m4/alloca.m4, m4/canonicalize.m4, m4/dup2.m4:
* m4/fchmodat.m4, m4/fcntl.m4, m4/fdopendir.m4, m4/fpending.m4:
* m4/futimens.m4, m4/getdtablesize.m4, m4/getloadavg.m4:
* m4/gnulib-common.m4, m4/include_next.m4, m4/largefile.m4:
* m4/manywarnings.m4, m4/mktime.m4, m4/nstrftime.m4, m4/open-slash.m4:
* m4/pselect.m4, m4/pthread_sigmask.m4, m4/time_h.m4, m4/utimens.m4:
* m4/utimensat.m4, m4/utimes.m4, m4/warnings.m4:
Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

This incorporates:
2020-08-11 Use expression statements also on clang
2020-08-10 Use many __attribute__s with clang
2020-08-09 Use attribute __aligned__ with clang
2020-08-09 Use __alignof__ with clang
2020-08-09 ignore-value: Simplify on clang
2020-08-09 Use __typeof__ with clang
2020-08-09 intprops: Fix typo in comment
2020-08-09 Silence warnings from clang 10 with -Wimplicit-fallthrough
2020-08-09 count-one-bits: Use __builtin_popcount{,l,ll} on clang
2020-08-09 string: Fix build error in C++ mode with clang
2020-08-09 Add ability to emit user-defined diagnostics with clang
2020-08-07 alloca: No need to compile alloca.c with clang
2020-08-06 Use __builtin_assume with clang
* lib/alloca.in.h, lib/arg-nonnull.h, lib/c++defs.h, lib/cdefs.h:
* lib/count-one-bits.h, lib/dirent.in.h, lib/ignore-value.h:
* lib/intprops.h, lib/malloca.h, lib/regex_internal.h:
* lib/stdalign.in.h, lib/stddef.in.h, lib/stdio.in.h:
* lib/stdlib.in.h, lib/string.in.h, lib/verify.h, lib/warn-on-use.h:
* m4/gnulib-common.m4, m4/stddef_h.m4, m4/stdint.m4:
Copy from Gnulib.

This incorporates:
2020-05-09 stdio: don't redefine _GL_ATTRIBUTE_FORMAT
2020-05-09 dirent, stdlib, string: don't redefine _GL_ATTRIBUTE_PURE
2020-05-08 limits-h: define LONG_BIT correctly on Haiku/x86_64
2020-05-08 ignore-value tests: use module 'attribute'
2020-05-06 attribute: minor style fixes
* build-aux/config.sub, doc/misc/texinfo.tex, lib/attribute.h:
* lib/dirent.in.h, lib/limits.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/string.in.h, m4/gnulib-common.m4:
Copy from Gnulib.

This incorporates:
2020-02-22 fchmodat, lchmod: simplify
2020-02-22 lchmod: fix link error on Solaris 10
2020-02-22 use 'restrict' in all POSIX function declarations
2020-02-22 chmodat, chownat: new modules
* lib/gnulib.mk.in: Regenerate.
* lib/inttypes.in.h, lib/openat.h, lib/signal.in.h:
* lib/stdio.in.h, lib/stdlib.in.h, lib/string.in.h:
* lib/sys_stat.in.h, lib/time.in.h, lib/unistd.in.h, m4/inttypes.m4:
* m4/signal_h.m4, m4/stdio_h.m4, m4/stdlib_h.m4, m4/string_h.m4:
* m4/sys_socket_h.m4, m4/sys_stat_h.m4, m4/time_h.m4:
* m4/unistd_h.m4: Copy from Gnulib.

This incorporates:
2019-12-23 mktime, nstrftime: tweak division performance
2019-12-22 count-leading-zeros: assume 'long long'
2019-12-22 count-one-bits: assume 'long long'
2019-12-22 count-trailing-zeros: assume 'long long'
2019-12-12 inttypes-incomplete: assume 'long long'
2019-12-22 malloca: assume 'long long'
2019-12-22 stdint: assume 'long long'
2019-12-22 strtoll, strtoimax, strtoumax: assume 'long long'
2019-12-22 prefer lib_SOURCES to unconditional AC_LIBOBJ
2019-12-19 nstrftime: avoid a shadowing warning
2019-12-18 improve port of AC_C_RESTRICT to Oracle C++
2019-12-12 stdalign: port to xlclang 16.01
2019-12-11 stddef, unistd: fix compilation error in C++ mode on MSVC
2019-12-08 fix compilation errors in C++ mode on Haiku
2019-12-08 fix compilation errors in 32-bit C++ mode on HP-UX 11/ia64
2019-12-08 fix compilation error in C++ mode on OpenBSD
* build-aux/config.guess, doc/misc/texinfo.tex:
* lib/count-leading-zeros.h, lib/count-one-bits.h:
* lib/count-trailing-zeros.h, lib/inttypes.in.h, lib/malloca.h:
* lib/mktime.c, lib/nstrftime.c, lib/signal.in.h, lib/stdalign.in.h:
* lib/stddef.in.h, lib/stdint.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/strtoimax.c, lib/unistd.in.h, m4/gnulib-common.m4:
* m4/inttypes.m4, m4/largefile.m4, m4/malloca.m4, m4/strtoimax.m4:
* m4/strtoll.m4:
Copy from Gnulib.  Also, change copyright notices in some other
Gnulib-copied files to exactly match Gnulib, as Gnulib updated
them in a trivially different way.
* lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

This incorporates:
2019-11-24 Fix errors in C++ mode on mingw
2019-11-24 time_r: Fix for mingw (regression from 2019-11-16)
2019-11-24 sys_time: Fix errors in C++ mode on mingw
2019-11-22 intprops: INT_MULTIPLY_WRAPV speedup for GCC 8.4+
2019-11-21 Disable many _GL_CXXALIASWARN on non-glibc
2019-11-21 Fix various errors in _GL_CXXALIAS_SYS invocations
2019-11-19 intprops: INT_MULTIPLY_WRAPV speedup for GCC 9.3+
2019-11-18 stdint: Define [u]intptr_t correctly on 64-bit native Windows
2019-11-18 stdint: Fix value of WINT_MAX when we override wint_t
2019-11-18 stdint: Avoid "conflicting types" error on mingw 5.22
2019-11-16 time_r: Fix for mingw
2019-11-06 regex: now back in sync with glibc
* lib/intprops.h, lib/regexec.c, lib/signal.in.h:
* lib/stdint.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/string.in.h, lib/sys_select.in.h, lib/sys_time.in.h:
* lib/time.in.h, lib/unistd.in.h, m4/time_r.m4:
Copy from Gnulib.

This incorporates:
2019-01-26 getloadavg: Add support for Android
2019-01-24 fchownat: Fix compilation error on Android 4.3
2019-01-24 mbtowc: Fix compilation error on Android 4.3
2019-01-24 random: Fix compilation error on Android 4.3
2019-01-24 renameat: Fix compilation error on Android 4.3
2019-01-24 unlinkat: Fix compilation error on Android 4.3
2019-01-19 gettext: support disabling use of VLAs
2019-01-17 sys_stat: Fix warning on OS/2 kLIBC
2019-01-17 fcntl: Fix syntax error (regression from 2018-10-05)
2019-01-10 verify: Enable _GL_HAVE_STATIC_ASSERT for recent G++
2018-12-22 stdioext: port to newer 32-bit Android
2018-12-16 libc-config: Support HP-UX cc in C99 mode.
* build-aux/config.guess, build-aux/config.sub, doc/misc/texinfo.tex:
* lib/cdefs.h, lib/fcntl.c, lib/getloadavg.c, lib/gettext.h:
* lib/regexec.c, lib/stdio-impl.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/sys_stat.in.h, lib/unistd.in.h, lib/verify.h, m4/stdlib_h.m4:
Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

2fcf2df Fix copyright years by hand
26bed8b Update copyright year to 2019
2814292 Fix value of default frame height.  (Bug#33921)

Run 'TZ=UTC0 admin/update-copyright $(git ls-files)'.