Update gnulib to current trunk

This fixes two issues on Windows: Update.
https://sourceware.org/pipermail/gdb-patches/2020-June/169978.html

gnulib/ChangeLog:

2020-08-26  Christian Biesinger  <cbiesinger@google.com>
	    Pedro Alves  <palves@redhat.com>
	    Joel Brobecker  <brobecker@adacore.com>

	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* config.in: Regenerate.
	* configure: Regenerate.
	* import/Makefile.am: Update.
	* import/Makefile.in: Regenerate.
	* import/alloca.in.h (if): Update.
	* import/assure.h (affirm): Update.
	* import/at-func.c: Update.
	* import/attribute.h: New file.
	* import/btowc.c: New file.
	* import/canonicalize-lgpl.c: Update.
	* import/count-one-bits.h (COUNT_ONE_BITS_GENERIC): Update.
	(COUNT_ONE_BITS): Update.
	(intrinsic): Update.
	(__popcnt64): Update.
	(popcount_supported): Update.
	* import/ctype.in.h: New file.
	* import/dirent-private.h (WIN32_FIND_DATA): Update.
	* import/dirent.in.h (_GL_ATTRIBUTE_PURE): Update.
	* import/dirname.h: Update.
	* import/dosname.h: Remove.
	* import/error.h (_GL_ATTRIBUTE_FORMAT): Update.
	* import/extra/update-copyright: Update.
	* import/fchdir.c: Update.
	* import/fcntl.in.h (GNULIB_defined_rpl_fcntl): Update.
	(GNULIB_defined_fcntl): Update.
	* import/filename.h (HAS_DEVICE): Update.
	(IS_ABSOLUTE_PATH): Update.
	(IS_PATH_WITH_DIR): Update.
	(FILE_SYSTEM_PREFIX_LEN): Update.
	(_IS_DRIVE_LETTER): Update.
	(FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE): Update.
	(IS_ABSOLUTE_FILE_NAME): Update.
	(IS_RELATIVE_FILE_NAME): Update.
	(IS_FILE_NAME_WITH_DIR): Update.
	* import/filenamecat-lgpl.c (mfile_name_concat): Update.
	* import/fnmatch.c (WIDE_CHAR_SUPPORT): Update.
	(btowc): Update.
	(iswctype): Update.
	(mempcpy): Update.
	(strnlen): Update.
	(towlower): Update.
	(wcscat): Update.
	(wcslen): Update.
	(wctype): Update.
	(wmemchr): Update.
	(wmempcpy): Update.
	(SIZE_MAX): Update.
	(isblank): Update.
	(__libc_use_alloca): Update.
	(alloca): Update.
	(alloca_account): Update.
	(STREQ): Update.
	(CHAR_CLASS_MAX_LENGTH): Update.
	(IS_CHAR_CLASS): Update.
	(ISWCTYPE): Update.
	(if): Update.
	(HANDLE_MULTIBYTE): Update.
	(internal_function): Update.
	(FOLD): Update.
	(CHAR): Update.
	(UCHAR): Update.
	(INT): Update.
	(FCT): Update.
	(EXT): Update.
	(END): Update.
	(L_): Update.
	(BTOWC): Update.
	(STRLEN): Update.
	(STRCAT): Update.
	(MEMPCPY): Update.
	(MEMCHR): Update.
	(WIDE_CHAR_VERSION): Update.
	(STRUCT): Update.
	(FINDIDX): Update.
	(findidx): Update.
	(ALLOCA_LIMIT): Update.
	(SHLIB_COMPAT): Update.
	* import/fnmatch_loop.c (struct STRUCT): Update.
	(FCT): Update.
	(EXT): Update.
	(END): Update.
	(str): Update.
	(NEW_PATTERN): Update.
	* import/getcwd.c: Update.
	* import/getlogin_r.c (GetUserName): Update.
	* import/getprogname.c (getprogname): Update.
	* import/getrandom.c: New file.
	* import/gettimeofday.c: Remove.
	* import/glob.in.h (_Restrict_): Update.
	* import/inttypes.in.h (_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	* import/isblank.c: New file.
	* import/isnanl-nolibm.h (__has_builtin): Update.
	* import/libc-config.h (versioned_symbol): Update.
	(compat_symbol): Update.
	* import/limits.in.h (_GL_ALREADY_INCLUDING_LIMITS_H): Update.
	* import/m4/btowc.m4: New file.
	* import/m4/ctype.m4: New file.
	* import/m4/exponentl.m4: Update.
	* import/m4/fnmatch.m4: Update.
	* import/m4/getrandom.m4: New file.
	* import/m4/glob.m4: Update.
	* import/m4/gnulib-cache.m4: Update.
	* import/m4/gnulib-common.m4: Update.
	* import/m4/gnulib-comp.m4: Update.
	* import/m4/inttypes.m4: Update.
	* import/m4/isblank.m4: New file.
	* import/m4/isnanl.m4: Update.
	* import/m4/largefile.m4: Update.
	* import/m4/mbtowc.m4: New file.
	* import/m4/memmem.m4: Update.
	* import/m4/minmax.m4: New file.
	* import/m4/signal_h.m4: Update.
	* import/m4/stdio_h.m4: Update.
	* import/m4/stdlib_h.m4: Update.
	* import/m4/string_h.m4: Update.
	* import/m4/strnlen.m4: New file.
	* import/m4/sys_random_h.m4: New file.
	* import/m4/sys_socket_h.m4: Update.
	* import/m4/sys_stat_h.m4: Update.
	* import/m4/time_h.m4: Update.
	* import/m4/unistd_h.m4: Update.
	* import/m4/wchar_h.m4: Update.
	* import/m4/wint_t.m4: Update.
	* import/m4/wmemchr.m4: New file.
	* import/m4/wmempcpy.m4: New file.
	* import/math.in.h (__has_builtin): Update.
	* import/mbrtowc.c (FALLTHROUGH): Update.
	* import/mbtowc-impl.h: New file.
	* import/mbtowc.c: New file.
	* import/minmax.h: New file.
	* import/open.c (open): Update.
	* import/openat-proc.c (openat_proc_name): Update.
	* import/openat.c (rpl_openat): Update.
	(openat_needs_fchdir): Update.
	* import/openat.h (FCHOWNAT_INLINE): Update.
	(CHOWNAT_INLINE): Update.
	(FCHMODAT_INLINE): Update.
	(CHMODAT_INLINE): Update.
	* import/opendir.c (WIN32_FIND_DATA): Update.
	(GetFullPathName): Update.
	(FindFirstFile): Update.
	* import/readdir.c (FindNextFile): Update.
	* import/rename.c (MoveFileEx): Update.
	* import/rewinddir.c (FindFirstFile): Update.
	* import/rmdir.c: Update.
	* import/signal.in.h (_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	* import/stat-w32.c (_WIN32_WINNT): Update.
	(LoadLibrary): Update.
	(GetFinalPathNameByHandle): Update.
	(GetProcAddress): Update.
	(DWORD): Update.
	(GetFileInformationByHandleExFunc): Update.
	(GetFinalPathNameByHandleFunc): Update.
	* import/stat.c (WIN32_FIND_DATA): Update.
	(CreateFile): Update.
	(FindFirstFile): Update.
	* import/stdio.in.h (_GL_ATTRIBUTE_FORMAT): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	(_GL_FUNCDECL_RPL_1): Update.
	(_GL_CXXALIAS_RPL_1): Update.
	(_GL_CXXALIAS_SYS_CAST): Update.
	* import/stdlib.in.h (_GL_ATTRIBUTE_PURE): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	* import/string.in.h (_GL_ATTRIBUTE_PURE): Update.
	(_GL_WARN_ON_USE): Update.
	(_GL_WARN_ON_USE_CXX): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_CXXALIAS_SYS): Update.
	(mbstok_r): Update.
	* import/strnlen.c: New file.
	* import/sys_random.in.h: New file.
	* import/sys_socket.in.h (GNULIB_defined_socklen_t): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_CXXALIAS_SYS_CAST): Update.
	* import/sys_stat.in.h (_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	(lchmod): Update.
	(_GL_CXXALIAS_RPL_1): Update.
	(stat): Update.
	* import/tempname.c (__set_errno): Update.
	(__secure_getenv): Update.
	(__try_tempname): Update.
	(__getpid): Update.
	(__gettimeofday): Update.
	(RANDOM_BITS): Update.
	(uint64_t): Update.
	(RANDOM_VALUE_MAX): Update.
	(BASE_62_DIGITS): Update.
	(BASE_62_POWER): Update.
	(try_tempname_len): Update.
	(try_file): Update.
	(try_dir): Update.
	(try_nocreate): Update.
	(gen_tempname_len): Update.
	(__gen_tempname): Update.
	(try_tempname): Update.
	* import/tempname.h (gen_tempname_len): Update.
	(try_tempname_len): Update.
	* import/time.in.h (_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_CXXALIAS_SYS): Update.
	* import/unistd.in.h (if): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	(_GL_CXXALIASWARN): Update.
	(_GL_WARN_ON_USE): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	* import/verify.h: Update.
	* import/warn-on-use.h (_GL_WARN_ON_USE_CXX): Update.
	* import/wchar.in.h (_GL_ATTRIBUTE_PURE): Update.
	(_GL_FUNCDECL_RPL): Update.
	(_GL_CXXALIAS_RPL): Update.
	(_GL_FUNCDECL_SYS): Update.
	(_GL_CXXALIAS_SYS): Update.
	(_GL_CXXALIASWARN): Update.
	(_GL_WARN_ON_USE): Update.
	(_GL_CXXALIAS_SYS_CAST2): Update.
	(_GL_CXXALIASWARN1): Update.
	* import/windows-rwlock.c (CreateEvent): Update.
	* import/wmemchr-impl.h: New file.
	* import/wmemchr.c: New file.
	* import/wmempcpy.c: New file.
	* update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add gettimeofday.
	(GNULIB_COMMIT_SHA1): Update gnulib revision.

30 files changed, 787 insertions, 77 deletions

diff --git a/gnulib/import/m4/btowc.m4 b/gnulib/import/m4/btowc.m4
new file mode 100644
index 0000000..c28ccb2
--- /dev/null
+++ b/gnulib/import/m4/btowc.m4
@@ -0,0 +1,120 @@
+# btowc.m4 serial 11
+dnl Copyright (C) 2008-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_BTOWC],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+
+  dnl Check whether <wchar.h> is usable at all, first. Otherwise the test
+  dnl program below may lead to an endless loop. See
+  dnl <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>.
+  AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
+
+  AC_CHECK_FUNCS_ONCE([btowc])
+  if test $ac_cv_func_btowc = no; then
+    HAVE_BTOWC=0
+  else
+
+    AC_REQUIRE([AC_PROG_CC])
+    AC_REQUIRE([gt_LOCALE_FR])
+    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+
+    dnl Cygwin 1.7.2 btowc('\0') is WEOF, not 0.
+    AC_CACHE_CHECK([whether btowc(0) is correct],
+      [gl_cv_func_btowc_nul],
+      [
+        AC_RUN_IFELSE(
+          [AC_LANG_SOURCE([[
+#include <string.h>
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
+   included before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <wchar.h>
+int main ()
+{
+  if (btowc ('\0') != 0)
+    return 1;
+  return 0;
+}]])],
+          [gl_cv_func_btowc_nul=yes],
+          [gl_cv_func_btowc_nul=no],
+          [
+changequote(,)dnl
+           case "$host_os" in
+                      # Guess no on Cygwin.
+             cygwin*) gl_cv_func_btowc_nul="guessing no" ;;
+                      # Guess yes on native Windows.
+             mingw*)  gl_cv_func_btowc_nul="guessing yes" ;;
+                      # Guess yes otherwise.
+             *)       gl_cv_func_btowc_nul="guessing yes" ;;
+           esac
+changequote([,])dnl
+          ])
+      ])
+
+    dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF.
+    AC_CACHE_CHECK([whether btowc(EOF) is correct],
+      [gl_cv_func_btowc_eof],
+      [
+        dnl Initial guess, used when cross-compiling or when no suitable locale
+        dnl is present.
+changequote(,)dnl
+        case "$host_os" in
+                  # Guess no on IRIX.
+          irix*)  gl_cv_func_btowc_eof="guessing no" ;;
+                  # Guess yes on native Windows.
+          mingw*) gl_cv_func_btowc_eof="guessing yes" ;;
+                  # Guess yes otherwise.
+          *)      gl_cv_func_btowc_eof="guessing yes" ;;
+        esac
+changequote([,])dnl
+        if test $LOCALE_FR != none; then
+          AC_RUN_IFELSE(
+            [AC_LANG_SOURCE([[
+#include <locale.h>
+#include <string.h>
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
+   included before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <wchar.h>
+int main ()
+{
+  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
+    {
+      if (btowc (EOF) != WEOF)
+        return 1;
+    }
+  return 0;
+}]])],
+            [gl_cv_func_btowc_eof=yes],
+            [gl_cv_func_btowc_eof=no],
+            [:])
+        fi
+      ])
+
+    case "$gl_cv_func_btowc_nul" in
+      *yes) ;;
+      *) REPLACE_BTOWC=1 ;;
+    esac
+    case "$gl_cv_func_btowc_eof" in
+      *yes) ;;
+      *) REPLACE_BTOWC=1 ;;
+    esac
+  fi
+])
+
+# Prerequisites of lib/btowc.c.
+AC_DEFUN([gl_PREREQ_BTOWC], [
+  :
+])
diff --git a/gnulib/import/m4/ctype.m4 b/gnulib/import/m4/ctype.m4
new file mode 100644
index 0000000..0b123d5
--- /dev/null
+++ b/gnulib/import/m4/ctype.m4
@@ -0,0 +1,32 @@
+# ctype_h.m4 serial 6
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_CTYPE_H],
+[
+  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+
+  dnl <ctype.h> is always overridden, because of GNULIB_POSIXCHECK.
+  gl_NEXT_HEADERS([ctype.h])
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[#include <ctype.h>
+    ]], [isblank])
+])
+
+AC_DEFUN([gl_CTYPE_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+])
+
+AC_DEFUN([gl_CTYPE_H_DEFAULTS],
+[
+  GNULIB_ISBLANK=0; AC_SUBST([GNULIB_ISBLANK])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_ISBLANK=1;   AC_SUBST([HAVE_ISBLANK])
+])
diff --git a/gnulib/import/m4/exponentl.m4 b/gnulib/import/m4/exponentl.m4
index b33b3bf..0a35c11 100644
--- a/gnulib/import/m4/exponentl.m4
+++ b/gnulib/import/m4/exponentl.m4
@@ -1,4 +1,4 @@
-# exponentl.m4 serial 4
+# exponentl.m4 serial 5
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -22,14 +22,14 @@ typedef union { long double value; unsigned int word[NWORDS]; }
         memory_long_double;
 static unsigned int ored_words[NWORDS];
 static unsigned int anded_words[NWORDS];
-static void add_to_ored_words (long double x)
+static void add_to_ored_words (long double *x)
 {
   memory_long_double m;
   size_t i;
   /* Clear it first, in case
      sizeof (long double) < sizeof (memory_long_double).  */
   memset (&m, 0, sizeof (memory_long_double));
-  m.value = x;
+  m.value = *x;
   for (i = 0; i < NWORDS; i++)
     {
       ored_words[i] |= m.word[i];
@@ -38,17 +38,15 @@ static void add_to_ored_words (long double x)
 }
 int main ()
 {
+  static long double samples[5] = { 0.25L, 0.5L, 1.0L, 2.0L, 4.0L };
   size_t j;
   FILE *fp = fopen ("conftest.out", "w");
   if (fp == NULL)
     return 1;
   for (j = 0; j < NWORDS; j++)
     anded_words[j] = ~ (unsigned int) 0;
-  add_to_ored_words (0.25L);
-  add_to_ored_words (0.5L);
-  add_to_ored_words (1.0L);
-  add_to_ored_words (2.0L);
-  add_to_ored_words (4.0L);
+  for (j = 0; j < 5; j++)
+    add_to_ored_words (&samples[j]);
   /* Remove bits that are common (e.g. if representation of the first mantissa
      bit is explicit).  */
   for (j = 0; j < NWORDS; j++)
diff --git a/gnulib/import/m4/fnmatch.m4 b/gnulib/import/m4/fnmatch.m4
index 0f41f8c..2f8e4a8 100644
--- a/gnulib/import/m4/fnmatch.m4
+++ b/gnulib/import/m4/fnmatch.m4
@@ -1,4 +1,4 @@
-# Check for fnmatch - serial 14.  -*- coding: utf-8 -*-
+# Check for fnmatch - serial 15.  -*- coding: utf-8 -*-
 
 # Copyright (C) 2000-2007, 2009-2020 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -149,7 +149,5 @@ AC_DEFUN([gl_PREREQ_FNMATCH],
 [
   dnl Prerequisites of lib/fnmatch.c.
   AC_REQUIRE([AC_TYPE_MBSTATE_T])
-  AC_CHECK_DECLS([isblank], [], [], [[#include <ctype.h>]])
-  AC_CHECK_FUNCS_ONCE([btowc isblank iswctype mbsrtowcs mempcpy wmemchr wmemcpy wmempcpy])
-  AC_CHECK_HEADERS_ONCE([wctype.h])
+  AC_CHECK_FUNCS_ONCE([mbsrtowcs])
 ])
diff --git a/gnulib/import/m4/getrandom.m4 b/gnulib/import/m4/getrandom.m4
new file mode 100644
index 0000000..2a0034b
--- /dev/null
+++ b/gnulib/import/m4/getrandom.m4
@@ -0,0 +1,65 @@
+# getrandom.m4 serial 6
+dnl Copyright 2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Written by Paul Eggert.
+
+AC_DEFUN([gl_FUNC_GETRANDOM],
+[
+  AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([getrandom])
+  if test "$ac_cv_func_getrandom" != yes; then
+    HAVE_GETRANDOM=0
+  else
+    dnl On Solaris 11.4 the return type is 'int', not 'ssize_t'.
+    AC_CACHE_CHECK([whether getrandom is compatible with its GNU+BSD signature],
+      [gl_cv_func_getrandom_ok],
+      [AC_COMPILE_IFELSE(
+         [AC_LANG_PROGRAM(
+            [[/* Additional includes are needed before <sys/random.h> on Mac OS X.  */
+              #include <sys/types.h>
+              #include <stdlib.h>
+              #include <sys/random.h>
+              ssize_t getrandom (void *, size_t, unsigned int);
+            ]],
+            [[]])
+         ],
+         [gl_cv_func_getrandom_ok=yes],
+         [gl_cv_func_getrandom_ok=no])
+      ])
+    if test $gl_cv_func_getrandom_ok = no; then
+      REPLACE_GETRANDOM=1
+    fi
+  fi
+
+  case "$host_os" in
+    mingw*)
+      AC_CHECK_HEADERS([bcrypt.h])
+      AC_CACHE_CHECK([whether the bcrypt library is guaranteed to be present],
+        [gl_cv_lib_assume_bcrypt],
+        [AC_COMPILE_IFELSE(
+           [AC_LANG_PROGRAM(
+              [[#include <windows.h>]],
+              [[#if !(_WIN32_WINNT >= _WIN32_WINNT_WIN7)
+                  cannot assume it
+                #endif
+              ]])
+           ],
+           [gl_cv_lib_assume_bcrypt=yes],
+           [gl_cv_lib_assume_bcrypt=no])
+        ])
+      if test $gl_cv_lib_assume_bcrypt = yes; then
+        AC_DEFINE([HAVE_LIB_BCRYPT], [1],
+          [Define to 1 if the bcrypt library is guaranteed to be present.])
+        LIB_GETRANDOM='-lbcrypt'
+      else
+        LIB_GETRANDOM='-ladvapi32'
+      fi
+      ;;
+    *)
+      LIB_GETRANDOM= ;;
+  esac
+  AC_SUBST([LIB_GETRANDOM])
+])
diff --git a/gnulib/import/m4/glob.m4 b/gnulib/import/m4/glob.m4
index dbd09e8..d4cd03f 100644
--- a/gnulib/import/m4/glob.m4
+++ b/gnulib/import/m4/glob.m4
@@ -1,4 +1,4 @@
-# glob.m4 serial 23
+# glob.m4 serial 24
 dnl Copyright (C) 2005-2007, 2009-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -47,6 +47,7 @@ char a[_GNU_GLOB_INTERFACE_VERSION == 1 || _GNU_GLOB_INTERFACE_VERSION == 2 ? 1
                   [[glob_t found;
                     if (glob ("conf*-globtest", 0, NULL, &found) == GLOB_NOMATCH)
                       return 1;
+                    globfree (&found);
                   ]])],
                [gl_cv_glob_lists_symlinks=yes],
                [gl_cv_glob_lists_symlinks=no],
diff --git a/gnulib/import/m4/gnulib-cache.m4 b/gnulib/import/m4/gnulib-cache.m4
index ce00c9e..db95504 100644
--- a/gnulib/import/m4/gnulib-cache.m4
+++ b/gnulib/import/m4/gnulib-cache.m4
@@ -47,6 +47,7 @@
 #  fnmatch-gnu \
 #  frexpl \
 #  getcwd \
+#  gettimeofday \
 #  glob \
 #  inet_ntop \
 #  inttypes \
@@ -87,6 +88,7 @@ gl_MODULES([
   fnmatch-gnu
   frexpl
   getcwd
+  gettimeofday
   glob
   inet_ntop
   inttypes
diff --git a/gnulib/import/m4/gnulib-common.m4 b/gnulib/import/m4/gnulib-common.m4
index b4795c1..f4ba5e3 100644
--- a/gnulib/import/m4/gnulib-common.m4
+++ b/gnulib/import/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 48
+# gnulib-common.m4 serial 50
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -15,6 +15,15 @@ AC_DEFUN([gl_COMMON], [
   AC_REQUIRE([gl_ZZGNULIB])
 ])
 AC_DEFUN([gl_COMMON_BODY], [
+  AH_VERBATIM([_GL_GNUC_PREREQ],
+[/* True if the compiler says it groks GNU C version MAJOR.MINOR.  */
+#if defined __GNUC__ && defined __GNUC_MINOR__
+# define _GL_GNUC_PREREQ(major, minor) \
+    ((major) < __GNUC__ + ((minor) <= __GNUC_MINOR__))
+#else
+# define _GL_GNUC_PREREQ(major, minor) 0
+#endif
+])
   AH_VERBATIM([_Noreturn],
 [/* The _Noreturn keyword of C11.  */
 #ifndef _Noreturn
@@ -31,12 +40,12 @@ AC_DEFUN([gl_COMMON_BODY], [
 #  define _Noreturn [[noreturn]]
 # elif ((!defined __cplusplus || defined __clang__) \
         && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
+            || _GL_GNUC_PREREQ (4, 7) \
             || (defined __apple_build_version__ \
                 ? 6000000 <= __apple_build_version__ \
                 : 3 < __clang_major__ + (5 <= __clang_minor__))))
    /* _Noreturn works as-is.  */
-# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
+# elif _GL_GNUC_PREREQ (2, 8) || 0x5110 <= __SUNPRO_C
 #  define _Noreturn __attribute__ ((__noreturn__))
 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
 #  define _Noreturn __declspec (noreturn)
@@ -55,48 +64,206 @@ AC_DEFUN([gl_COMMON_BODY], [
 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
 # define __GNUC_STDC_INLINE__ 1
 #endif])
-  AH_VERBATIM([unused_parameter],
-[/* Define as a marker that can be attached to declarations that might not
-    be used.  This helps to reduce warnings, such as from
-    GCC -Wunused-parameter.  */
-#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
-# define _GL_UNUSED __attribute__ ((__unused__))
+  AH_VERBATIM([attribute],
+[/* Attributes.  */
+#ifdef __has_attribute
+# define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__)
 #else
-# define _GL_UNUSED
+# define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr
+# define _GL_ATTR_alloc_size _GL_GNUC_PREREQ (4, 3)
+# define _GL_ATTR_always_inline _GL_GNUC_PREREQ (3, 2)
+# define _GL_ATTR_artificial _GL_GNUC_PREREQ (4, 3)
+# define _GL_ATTR_cold _GL_GNUC_PREREQ (4, 3)
+# define _GL_ATTR_const _GL_GNUC_PREREQ (2, 95)
+# define _GL_ATTR_deprecated _GL_GNUC_PREREQ (3, 1)
+# define _GL_ATTR_error _GL_GNUC_PREREQ (4, 3)
+# define _GL_ATTR_externally_visible _GL_GNUC_PREREQ (4, 1)
+# define _GL_ATTR_fallthrough _GL_GNUC_PREREQ (7, 0)
+# define _GL_ATTR_format _GL_GNUC_PREREQ (2, 7)
+# define _GL_ATTR_leaf _GL_GNUC_PREREQ (4, 6)
+# ifdef _ICC
+#  define _GL_ATTR_may_alias 0
+# else
+#  define _GL_ATTR_may_alias _GL_GNUC_PREREQ (3, 3)
+# endif
+# define _GL_ATTR_malloc _GL_GNUC_PREREQ (3, 0)
+# define _GL_ATTR_noinline _GL_GNUC_PREREQ (3, 1)
+# define _GL_ATTR_nonnull _GL_GNUC_PREREQ (3, 3)
+# define _GL_ATTR_nonstring _GL_GNUC_PREREQ (8, 0)
+# define _GL_ATTR_nothrow _GL_GNUC_PREREQ (3, 3)
+# define _GL_ATTR_packed _GL_GNUC_PREREQ (2, 7)
+# define _GL_ATTR_pure _GL_GNUC_PREREQ (2, 96)
+# define _GL_ATTR_returns_nonnull _GL_GNUC_PREREQ (4, 9)
+# define _GL_ATTR_sentinel _GL_GNUC_PREREQ (4, 0)
+# define _GL_ATTR_unused _GL_GNUC_PREREQ (2, 7)
+# define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4)
 #endif
-/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
-   is a misnomer outside of parameter lists.  */
-#define _UNUSED_PARAMETER_ _GL_UNUSED
-
-/* gcc supports the "unused" attribute on possibly unused labels, and
-   g++ has since version 4.5.  Note to support C++ as well as C,
-   _GL_UNUSED_LABEL should be used with a trailing ;  */
-#if !defined __cplusplus || __GNUC__ > 4 \
-    || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
-# define _GL_UNUSED_LABEL _GL_UNUSED
+
+]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's _Alignas instead.
+[
+#if _GL_HAS_ATTRIBUTE (alloc_size)
+# define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 #else
-# define _GL_UNUSED_LABEL
+# define _GL_ATTRIBUTE_ALLOC_SIZE(args)
 #endif
 
-/* The __pure__ attribute was added in gcc 2.96.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
-# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#if _GL_HAS_ATTRIBUTE (always_inline)
+# define _GL_ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
 #else
-# define _GL_ATTRIBUTE_PURE /* empty */
+# define _GL_ATTRIBUTE_ALWAYS_INLINE
 #endif
 
-/* The __const__ attribute was added in gcc 2.95.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
+#if _GL_HAS_ATTRIBUTE (artificial)
+# define _GL_ATTRIBUTE_ARTIFICIAL __attribute__ ((__artificial__))
+#else
+# define _GL_ATTRIBUTE_ARTIFICIAL
+#endif
+
+/* Avoid __attribute__ ((cold)) on MinGW; see thread starting at
+   <https://lists.gnu.org/r/emacs-devel/2019-04/msg01152.html>. */
+#if _GL_HAS_ATTRIBUTE (cold) && !defined __MINGW32__
+# define _GL_ATTRIBUTE_COLD __attribute__ ((__cold__))
+#else
+# define _GL_ATTRIBUTE_COLD
+#endif
+
+#if _GL_HAS_ATTRIBUTE (const)
 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
 #else
-# define _GL_ATTRIBUTE_CONST /* empty */
+# define _GL_ATTRIBUTE_CONST
 #endif
 
-/* The __malloc__ attribute was added in gcc 3.  */
-#if 3 <= __GNUC__
+#if 201710L < __STDC_VERSION__
+# define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]]
+#elif _GL_HAS_ATTRIBUTE (deprecated)
+# define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
+#else
+# define _GL_ATTRIBUTE_DEPRECATED
+#endif
+
+#if _GL_HAS_ATTRIBUTE (error)
+# define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__error__ (msg)))
+# define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__warning__ (msg)))
+#else
+# define _GL_ATTRIBUTE_ERROR(msg)
+# define _GL_ATTRIBUTE_WARNING(msg)
+#endif
+
+#if _GL_HAS_ATTRIBUTE (externally_visible)
+# define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((externally_visible))
+#else
+# define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE
+#endif
+
+/* FALLTHROUGH is special, because it always expands to something.  */
+#if 201710L < __STDC_VERSION__
+# define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]]
+#elif _GL_HAS_ATTRIBUTE (fallthrough)
+# define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
+#else
+# define _GL_ATTRIBUTE_FALLTHROUGH ((void) 0)
+#endif
+
+#if _GL_HAS_ATTRIBUTE (format)
+# define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
+#else
+# define _GL_ATTRIBUTE_FORMAT(spec)
+#endif
+
+#if _GL_HAS_ATTRIBUTE (leaf)
+# define _GL_ATTRIBUTE_LEAF __attribute__ ((__leaf__))
+#else
+# define _GL_ATTRIBUTE_LEAF
+#endif
+
+#if _GL_HAS_ATTRIBUTE (may_alias)
+# define _GL_ATTRIBUTE_MAY_ALIAS __attribute__ ((__may_alias__))
+#else
+# define _GL_ATTRIBUTE_MAY_ALIAS
+#endif
+
+#if 201710L < __STDC_VERSION__
+# define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
+#elif _GL_HAS_ATTRIBUTE (unused)
+# define _GL_ATTRIBUTE_MAYBE_UNUSED __attribute__ ((__unused__))
+#else
+# define _GL_ATTRIBUTE_MAYBE_UNUSED
+#endif
+/* Earlier spellings of this macro.  */
+#define _GL_UNUSED _GL_ATTRIBUTE_MAYBE_UNUSED
+#define _UNUSED_PARAMETER_ _GL_ATTRIBUTE_MAYBE_UNUSED
+
+#if _GL_HAS_ATTRIBUTE (malloc)
 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 #else
-# define _GL_ATTRIBUTE_MALLOC /* empty */
+# define _GL_ATTRIBUTE_MALLOC
+#endif
+
+#if 201710L < __STDC_VERSION__
+# define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]]
+#elif _GL_HAS_ATTRIBUTE (warn_unused_result)
+# define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__))
+#else
+# define _GL_ATTRIBUTE_NODISCARD
+#endif
+
+#if _GL_HAS_ATTRIBUTE (noinline)
+# define _GL_ATTRIBUTE_NOINLINE __attribute__ ((__noinline__))
+#else
+# define _GL_ATTRIBUTE_NOINLINE
+#endif
+
+#if _GL_HAS_ATTRIBUTE (nonnull)
+# define _GL_ATTRIBUTE_NONNULL(args) __attribute__ ((__nonnull__ args))
+#else
+# define _GL_ATTRIBUTE_NONNULL(args)
+#endif
+
+#if _GL_HAS_ATTRIBUTE (nonstring)
+# define _GL_ATTRIBUTE_NONSTRING __attribute__ ((__nonstring__))
+#else
+# define _GL_ATTRIBUTE_NONSTRING
+#endif
+
+/* There is no _GL_ATTRIBUTE_NORETURN; use _Noreturn instead.  */
+
+#if _GL_HAS_ATTRIBUTE (nothrow) && !defined __cplusplus
+# define _GL_ATTRIBUTE_NOTHROW __attribute__ ((__nothrow__))
+#else
+# define _GL_ATTRIBUTE_NOTHROW
+#endif
+
+#if _GL_HAS_ATTRIBUTE (packed)
+# define _GL_ATTRIBUTE_PACKED __attribute__ ((__packed__))
+#else
+# define _GL_ATTRIBUTE_PACKED
+#endif
+
+#if _GL_HAS_ATTRIBUTE (pure)
+# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define _GL_ATTRIBUTE_PURE
+#endif
+
+#if _GL_HAS_ATTRIBUTE (returns_nonnull)
+# define _GL_ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
+#else
+# define _GL_ATTRIBUTE_RETURNS_NONNULL
+#endif
+
+#if _GL_HAS_ATTRIBUTE (sentinel)
+# define _GL_ATTRIBUTE_SENTINEL(pos) __attribute__ ((__sentinel__ pos))
+#else
+# define _GL_ATTRIBUTE_SENTINEL(pos)
+#endif
+
+]dnl There is no _GL_ATTRIBUTE_VISIBILITY; see m4/visibility.m4 instead.
+[
+/* To support C++ as well as C, use _GL_UNUSED_LABEL with trailing ';'.  */
+#if !defined __cplusplus || _GL_GNUC_PREREQ (4, 5)
+# define _GL_UNUSED_LABEL _GL_ATTRIBUTE_MAYBE_UNUSED
+#else
+# define _GL_UNUSED_LABEL
 #endif
 ])
   AH_VERBATIM([async_safe],
diff --git a/gnulib/import/m4/gnulib-comp.m4 b/gnulib/import/m4/gnulib-comp.m4
index 0c67b32..8c2c28e 100644
--- a/gnulib/import/m4/gnulib-comp.m4
+++ b/gnulib/import/m4/gnulib-comp.m4
@@ -49,6 +49,8 @@ AC_DEFUN([gl_EARLY],
   # Code from module arpa_inet:
   # Code from module assure:
   # Code from module at-internal:
+  # Code from module attribute:
+  # Code from module btowc:
   # Code from module builtin-expect:
   # Code from module c99:
   # Code from module canonicalize-lgpl:
@@ -58,12 +60,12 @@ AC_DEFUN([gl_EARLY],
   # Code from module close:
   # Code from module closedir:
   # Code from module count-one-bits:
+  # Code from module ctype:
   # Code from module d-ino:
   # Code from module d-type:
   # Code from module dirent:
   # Code from module dirfd:
   # Code from module dirname-lgpl:
-  # Code from module dosname:
   # Code from module double-slash-root:
   # Code from module dup:
   # Code from module dup2:
@@ -98,6 +100,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module getdtablesize:
   # Code from module getlogin_r:
   # Code from module getprogname:
+  # Code from module getrandom:
   # Code from module gettext-h:
   # Code from module gettimeofday:
   # Code from module glob:
@@ -108,6 +111,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module intprops:
   # Code from module inttypes:
   # Code from module inttypes-incomplete:
+  # Code from module isblank:
   # Code from module isnand-nolibm:
   # Code from module isnanl-nolibm:
   # Code from module largefile:
@@ -125,11 +129,13 @@ AC_DEFUN([gl_EARLY],
   # Code from module mbrtowc:
   # Code from module mbsinit:
   # Code from module mbsrtowcs:
+  # Code from module mbtowc:
   # Code from module memchr:
   # Code from module memmem:
   # Code from module memmem-simple:
   # Code from module mempcpy:
   # Code from module memrchr:
+  # Code from module minmax:
   # Code from module mkdir:
   # Code from module mkdtemp:
   # Code from module mkostemp:
@@ -179,10 +185,12 @@ AC_DEFUN([gl_EARLY],
   # Code from module strerror-override:
   # Code from module strerror_r-posix:
   # Code from module string:
+  # Code from module strnlen:
   # Code from module strnlen1:
   # Code from module strstr:
   # Code from module strstr-simple:
   # Code from module strtok_r:
+  # Code from module sys_random:
   # Code from module sys_socket:
   # Code from module sys_stat:
   # Code from module sys_time:
@@ -204,6 +212,8 @@ AC_DEFUN([gl_EARLY],
   # Code from module windows-once:
   # Code from module windows-recmutex:
   # Code from module windows-rwlock:
+  # Code from module wmemchr:
+  # Code from module wmempcpy:
   # Code from module xalloc-oversized:
 ])
 
@@ -226,6 +236,13 @@ AC_DEFUN([gl_INIT],
   gl_FUNC_ALLOCA
   gl_HEADER_ARPA_INET
   AC_PROG_MKDIR_P
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  gl_FUNC_BTOWC
+  if test $HAVE_BTOWC = 0 || test $REPLACE_BTOWC = 1; then
+    AC_LIBOBJ([btowc])
+    gl_PREREQ_BTOWC
+  fi
+  gl_WCHAR_MODULE_INDICATOR([btowc])
   gl___BUILTIN_EXPECT
   gl_CANONICALIZE_LGPL
   if test $HAVE_CANONICALIZE_FILE_NAME = 0 || test $REPLACE_CANONICALIZE_FILE_NAME = 1; then
@@ -251,6 +268,7 @@ AC_DEFUN([gl_INIT],
     AC_LIBOBJ([closedir])
   fi
   gl_DIRENT_MODULE_INDICATOR([closedir])
+  gl_CTYPE_H
   gl_CHECK_TYPE_STRUCT_DIRENT_D_INO
   gl_CHECK_TYPE_STRUCT_DIRENT_D_TYPE
   gl_DIRENT_H
@@ -376,6 +394,12 @@ AC_DEFUN([gl_INIT],
   gl_UNISTD_MODULE_INDICATOR([getlogin_r])
   AC_REQUIRE([gl_LIB_GETLOGIN])
   gl_FUNC_GETPROGNAME
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  gl_FUNC_GETRANDOM
+  if test $HAVE_GETRANDOM = 0 || test $REPLACE_GETRANDOM = 1; then
+    AC_LIBOBJ([getrandom])
+  fi
+  gl_SYS_RANDOM_MODULE_INDICATOR([getrandom])
   AC_SUBST([LIBINTL])
   AC_SUBST([LTLIBINTL])
   gl_FUNC_GETTIMEOFDAY
@@ -406,6 +430,12 @@ AC_DEFUN([gl_INIT],
   gl_ARPA_INET_MODULE_INDICATOR([inet_ntop])
   gl_INTTYPES_H
   gl_INTTYPES_INCOMPLETE
+  gl_FUNC_ISBLANK
+  if test $HAVE_ISBLANK = 0; then
+    AC_LIBOBJ([isblank])
+  fi
+  gl_MODULE_INDICATOR([isblank])
+  gl_CTYPE_MODULE_INDICATOR([isblank])
   gl_FUNC_ISNAND_NO_LIBM
   if test $gl_func_isnand_no_libm != yes; then
     AC_LIBOBJ([isnand])
@@ -465,6 +495,12 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_MBSRTOWCS
   fi
   gl_WCHAR_MODULE_INDICATOR([mbsrtowcs])
+  gl_FUNC_MBTOWC
+  if test $HAVE_MBTOWC = 0 || test $REPLACE_MBTOWC = 1; then
+    AC_LIBOBJ([mbtowc])
+    gl_PREREQ_MBTOWC
+  fi
+  gl_STDLIB_MODULE_INDICATOR([mbtowc])
   gl_FUNC_MEMCHR
   if test $HAVE_MEMCHR = 0 || test $REPLACE_MEMCHR = 1; then
     AC_LIBOBJ([memchr])
@@ -492,6 +528,7 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_MEMRCHR
   fi
   gl_STRING_MODULE_INDICATOR([memrchr])
+  gl_MINMAX
   gl_FUNC_MKDIR
   if test $REPLACE_MKDIR = 1; then
     AC_LIBOBJ([mkdir])
@@ -644,6 +681,12 @@ AC_DEFUN([gl_INIT],
   dnl For the modules argp, error.
   gl_MODULE_INDICATOR([strerror_r-posix])
   gl_HEADER_STRING_H
+  gl_FUNC_STRNLEN
+  if test $HAVE_DECL_STRNLEN = 0 || test $REPLACE_STRNLEN = 1; then
+    AC_LIBOBJ([strnlen])
+    gl_PREREQ_STRNLEN
+  fi
+  gl_STRING_MODULE_INDICATOR([strnlen])
   gl_FUNC_STRSTR
   if test $REPLACE_STRSTR = 1; then
     AC_LIBOBJ([strstr])
@@ -659,6 +702,8 @@ AC_DEFUN([gl_INIT],
     gl_PREREQ_STRTOK_R
   fi
   gl_STRING_MODULE_INDICATOR([strtok_r])
+  gl_HEADER_SYS_RANDOM
+  AC_PROG_MKDIR_P
   AC_REQUIRE([gl_HEADER_SYS_SOCKET])
   AC_PROG_MKDIR_P
   gl_HEADER_SYS_STAT_H
@@ -712,6 +757,16 @@ AC_DEFUN([gl_INIT],
       AC_LIBOBJ([windows-rwlock])
       ;;
   esac
+  gl_FUNC_WMEMCHR
+  if test $HAVE_WMEMCHR = 0; then
+    AC_LIBOBJ([wmemchr])
+  fi
+  gl_WCHAR_MODULE_INDICATOR([wmemchr])
+  gl_FUNC_WMEMPCPY
+  if test $HAVE_WMEMPCPY = 0; then
+    AC_LIBOBJ([wmempcpy])
+  fi
+  gl_WCHAR_MODULE_INDICATOR([wmempcpy])
   # End of code from modules
   m4_ifval(gl_LIBSOURCES_LIST, [
     m4_syscmd([test ! -d ]m4_defn([gl_LIBSOURCES_DIR])[ ||
@@ -860,7 +915,9 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/arpa_inet.in.h
   lib/assure.h
   lib/at-func.c
+  lib/attribute.h
   lib/basename-lgpl.c
+  lib/btowc.c
   lib/c++defs.h
   lib/canonicalize-lgpl.c
   lib/cdefs.h
@@ -872,12 +929,12 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/closedir.c
   lib/count-one-bits.c
   lib/count-one-bits.h
+  lib/ctype.in.h
   lib/dirent-private.h
   lib/dirent.in.h
   lib/dirfd.c
   lib/dirname-lgpl.c
   lib/dirname.h
-  lib/dosname.h
   lib/dup-safer-flag.c
   lib/dup-safer.c
   lib/dup.c
@@ -916,6 +973,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/getlogin_r.c
   lib/getprogname.c
   lib/getprogname.h
+  lib/getrandom.c
   lib/gettext.h
   lib/gettimeofday.c
   lib/glob-libc.h
@@ -932,6 +990,7 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/inet_ntop.c
   lib/intprops.h
   lib/inttypes.in.h
+  lib/isblank.c
   lib/isnan.c
   lib/isnand-nolibm.h
   lib/isnand.c
@@ -964,13 +1023,16 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/mbsrtowcs-impl.h
   lib/mbsrtowcs-state.c
   lib/mbsrtowcs.c
+  lib/mbtowc-impl.h
   lib/mbtowc-lock.c
   lib/mbtowc-lock.h
+  lib/mbtowc.c
   lib/memchr.c
   lib/memchr.valgrind
   lib/memmem.c
   lib/mempcpy.c
   lib/memrchr.c
+  lib/minmax.h
   lib/mkdir.c
   lib/mkdtemp.c
   lib/mkostemp.c
@@ -1027,10 +1089,12 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/strerror_r.c
   lib/string.in.h
   lib/stripslash.c
+  lib/strnlen.c
   lib/strnlen1.c
   lib/strnlen1.h
   lib/strstr.c
   lib/strtok_r.c
+  lib/sys_random.in.h
   lib/sys_socket.c
   lib/sys_socket.in.h
   lib/sys_stat.in.h
@@ -1060,18 +1124,23 @@ AC_DEFUN([gl_FILE_LIST], [
   lib/windows-recmutex.h
   lib/windows-rwlock.c
   lib/windows-rwlock.h
+  lib/wmemchr-impl.h
+  lib/wmemchr.c
+  lib/wmempcpy.c
   lib/xalloc-oversized.h
   m4/00gnulib.m4
   m4/__inline.m4
   m4/absolute-header.m4
   m4/alloca.m4
   m4/arpa_inet_h.m4
+  m4/btowc.m4
   m4/builtin-expect.m4
   m4/canonicalize.m4
   m4/chdir-long.m4
   m4/close.m4
   m4/closedir.m4
   m4/codeset.m4
+  m4/ctype.m4
   m4/d-ino.m4
   m4/d-type.m4
   m4/dirent_h.m4
@@ -1111,6 +1180,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/getlogin_r.m4
   m4/getpagesize.m4
   m4/getprogname.m4
+  m4/getrandom.m4
   m4/gettimeofday.m4
   m4/glob.m4
   m4/glob_h.m4
@@ -1119,6 +1189,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/inet_ntop.m4
   m4/inttypes-pri.m4
   m4/inttypes.m4
+  m4/isblank.m4
   m4/isnand.m4
   m4/isnanl.m4
   m4/largefile.m4
@@ -1138,10 +1209,12 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/mbsinit.m4
   m4/mbsrtowcs.m4
   m4/mbstate_t.m4
+  m4/mbtowc.m4
   m4/memchr.m4
   m4/memmem.m4
   m4/mempcpy.m4
   m4/memrchr.m4
+  m4/minmax.m4
   m4/mkdir.m4
   m4/mkdtemp.m4
   m4/mkostemp.m4
@@ -1188,8 +1261,10 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/strerror.m4
   m4/strerror_r.m4
   m4/string_h.m4
+  m4/strnlen.m4
   m4/strstr.m4
   m4/strtok_r.m4
+  m4/sys_random_h.m4
   m4/sys_socket_h.m4
   m4/sys_stat_h.m4
   m4/sys_time_h.m4
@@ -1207,5 +1282,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/wchar_t.m4
   m4/wctype_h.m4
   m4/wint_t.m4
+  m4/wmemchr.m4
+  m4/wmempcpy.m4
   m4/zzgnulib.m4
 ])
diff --git a/gnulib/import/m4/inttypes.m4 b/gnulib/import/m4/inttypes.m4
index d0487d6..224d0cd 100644
--- a/gnulib/import/m4/inttypes.m4
+++ b/gnulib/import/m4/inttypes.m4
@@ -1,4 +1,4 @@
-# inttypes.m4 serial 28
+# inttypes.m4 serial 29
 dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -28,6 +28,8 @@ AC_DEFUN_ONCE([gl_INTTYPES_INCOMPLETE],
   dnl corresponding gnulib module is not in use.
   gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
     ]], [imaxabs imaxdiv strtoimax strtoumax])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 # Ensure that the PRI* and SCN* macros are defined appropriately.
diff --git a/gnulib/import/m4/isblank.m4 b/gnulib/import/m4/isblank.m4
new file mode 100644
index 0000000..5e1b783
--- /dev/null
+++ b/gnulib/import/m4/isblank.m4
@@ -0,0 +1,17 @@
+# isblank.m4 serial 3
+dnl Copyright (C) 2009-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_ISBLANK],
+[
+  dnl Persuade glibc <ctype.h> to declare isblank().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([isblank])
+  if test $ac_cv_func_isblank = no; then
+    HAVE_ISBLANK=0
+  fi
+])
diff --git a/gnulib/import/m4/isnanl.m4 b/gnulib/import/m4/isnanl.m4
index 9874418..75d5462 100644
--- a/gnulib/import/m4/isnanl.m4
+++ b/gnulib/import/m4/isnanl.m4
@@ -1,4 +1,4 @@
-# isnanl.m4 serial 20
+# isnanl.m4 serial 21
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -68,7 +68,10 @@ AC_DEFUN([gl_HAVE_ISNANL_NO_LIBM],
       AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <math.h>
-             #if __GNUC__ >= 4
+             #ifndef __has_builtin
+             # define __has_builtin(name) 0
+             #endif
+             #if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl))
              # undef isnanl
              # define isnanl(x) __builtin_isnanl ((long double)(x))
              #elif defined isnan
@@ -93,7 +96,10 @@ AC_DEFUN([gl_HAVE_ISNANL_IN_LIBM],
       AC_LINK_IFELSE(
         [AC_LANG_PROGRAM(
            [[#include <math.h>
-             #if __GNUC__ >= 4
+             #ifndef __has_builtin
+             # define __has_builtin(name) 0
+             #endif
+             #if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl))
              # undef isnanl
              # define isnanl(x) __builtin_isnanl ((long double)(x))
              #elif defined isnan
@@ -123,7 +129,10 @@ AC_DEFUN([gl_FUNC_ISNANL_WORKS],
 #include <float.h>
 #include <limits.h>
 #include <math.h>
-#if __GNUC__ >= 4
+#ifndef __has_builtin
+# define __has_builtin(name) 0
+#endif
+#if __GNUC__ >= 4 && (!defined __clang__ || __has_builtin (__builtin_isnanl))
 # undef isnanl
 # define isnanl(x) __builtin_isnanl ((long double)(x))
 #elif defined isnan
diff --git a/gnulib/import/m4/largefile.m4 b/gnulib/import/m4/largefile.m4
index e381339..8017ca7 100644
--- a/gnulib/import/m4/largefile.m4
+++ b/gnulib/import/m4/largefile.m4
@@ -113,9 +113,6 @@ if test "$enable_largefile" != no; then
       [Define for large files, on AIX-style hosts.],
       [_AC_SYS_LARGEFILE_TEST_INCLUDES])
   fi
-
-  AC_DEFINE([_DARWIN_USE_64_BIT_INODE], [1],
-    [Enable large inode numbers on Mac OS X 10.5.])
 fi
 ])# AC_SYS_LARGEFILE
 ])# m4_version_prereq 2.70
diff --git a/gnulib/import/m4/mbtowc.m4 b/gnulib/import/m4/mbtowc.m4
new file mode 100644
index 0000000..befcffa
--- /dev/null
+++ b/gnulib/import/m4/mbtowc.m4
@@ -0,0 +1,24 @@
+# mbtowc.m4 serial 3
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_MBTOWC],
+[
+  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+
+  AC_CHECK_FUNCS([mbtowc])
+  if test $ac_cv_func_mbtowc = no; then
+    HAVE_MBTOWC=0
+  else
+    if false; then
+      REPLACE_MBTOWC=1
+    fi
+  fi
+])
+
+# Prerequisites of lib/mbtowc.c.
+AC_DEFUN([gl_PREREQ_MBTOWC], [
+  :
+])
diff --git a/gnulib/import/m4/memmem.m4 b/gnulib/import/m4/memmem.m4
index e034d7b..35a5bb1 100644
--- a/gnulib/import/m4/memmem.m4
+++ b/gnulib/import/m4/memmem.m4
@@ -1,4 +1,4 @@
-# memmem.m4 serial 26
+# memmem.m4 serial 27
 dnl Copyright (C) 2002-2004, 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -37,7 +37,7 @@ AC_DEFUN([gl_FUNC_MEMMEM_SIMPLE],
     /* Check for empty needle behavior.  */
     {
       const char *haystack = "AAA";
-      if (memmem (haystack, 3, NULL, 0) != haystack)
+      if (memmem (haystack, 3, (const char *) 1, 0) != haystack)
         result |= 2;
     }
     return result;
diff --git a/gnulib/import/m4/minmax.m4 b/gnulib/import/m4/minmax.m4
new file mode 100644
index 0000000..e5b28b0
--- /dev/null
+++ b/gnulib/import/m4/minmax.m4
@@ -0,0 +1,44 @@
+# minmax.m4 serial 4
+dnl Copyright (C) 2005, 2009-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_PREREQ([2.53])
+
+AC_DEFUN([gl_MINMAX],
+[
+  AC_REQUIRE([gl_PREREQ_MINMAX])
+])
+
+# Prerequisites of lib/minmax.h.
+AC_DEFUN([gl_PREREQ_MINMAX],
+[
+  gl_MINMAX_IN_HEADER([limits.h])
+  gl_MINMAX_IN_HEADER([sys/param.h])
+])
+
+dnl gl_MINMAX_IN_HEADER(HEADER)
+dnl The parameter has to be a literal header name; it cannot be macro,
+dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
+dnl invocations with a literal macro name.)
+AC_DEFUN([gl_MINMAX_IN_HEADER],
+[
+  m4_pushdef([header], AS_TR_SH([$1]))
+  m4_pushdef([HEADER], AS_TR_CPP([$1]))
+  AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
+    [gl_cv_minmax_in_]header,
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <$1>
+            int x = MIN (42, 17);]],
+          [[]])],
+       [gl_cv_minmax_in_]header[=yes],
+       [gl_cv_minmax_in_]header[=no])])
+  if test $gl_cv_minmax_in_[]header = yes; then
+    AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
+      [Define to 1 if <$1> defines the MIN and MAX macros.])
+  fi
+  m4_popdef([HEADER])
+  m4_popdef([header])
+])
diff --git a/gnulib/import/m4/signal_h.m4 b/gnulib/import/m4/signal_h.m4
index 0868438..b262980 100644
--- a/gnulib/import/m4/signal_h.m4
+++ b/gnulib/import/m4/signal_h.m4
@@ -1,4 +1,4 @@
-# signal_h.m4 serial 18
+# signal_h.m4 serial 19
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -34,6 +34,8 @@ AC_DEFUN([gl_SIGNAL_H],
     ]], [pthread_sigmask sigaction
     sigaddset sigdelset sigemptyset sigfillset sigismember
     sigpending sigprocmask])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_CHECK_TYPE_SIGSET_T],
diff --git a/gnulib/import/m4/stdio_h.m4 b/gnulib/import/m4/stdio_h.m4
index c603b51..5f968bc 100644
--- a/gnulib/import/m4/stdio_h.m4
+++ b/gnulib/import/m4/stdio_h.m4
@@ -1,4 +1,4 @@
-# stdio_h.m4 serial 49
+# stdio_h.m4 serial 50
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -107,6 +107,8 @@ AC_DEFUN([gl_STDIO_H],
   gl_WARN_ON_USE_PREPARE([[#include <stdio.h>
     ]], [dprintf fpurge fseeko ftello getdelim getline gets pclose popen
     renameat snprintf tmpfile vdprintf vsnprintf])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_STDIO_MODULE_INDICATOR],
diff --git a/gnulib/import/m4/stdlib_h.m4 b/gnulib/import/m4/stdlib_h.m4
index 61a3e31..743066a 100644
--- a/gnulib/import/m4/stdlib_h.m4
+++ b/gnulib/import/m4/stdlib_h.m4
@@ -1,4 +1,4 @@
-# stdlib_h.m4 serial 48
+# stdlib_h.m4 serial 49
 dnl Copyright (C) 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -27,6 +27,8 @@ AC_DEFUN([gl_STDLIB_H],
     posix_openpt ptsname ptsname_r qsort_r random random_r reallocarray
     realpath rpmatch secure_getenv setenv setstate setstate_r srandom
     srandom_r strtod strtold strtoll strtoull unlockpt unsetenv])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_STDLIB_MODULE_INDICATOR],
diff --git a/gnulib/import/m4/string_h.m4 b/gnulib/import/m4/string_h.m4
index 4c1f685..cc51337 100644
--- a/gnulib/import/m4/string_h.m4
+++ b/gnulib/import/m4/string_h.m4
@@ -5,7 +5,7 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 22
+# serial 23
 
 # Written by Paul Eggert.
 
@@ -18,7 +18,6 @@ AC_DEFUN([gl_HEADER_STRING_H],
 
 AC_DEFUN([gl_HEADER_STRING_H_BODY],
 [
-  AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
   gl_NEXT_HEADERS([string.h])
 
@@ -30,6 +29,8 @@ AC_DEFUN([gl_HEADER_STRING_H_BODY],
     [ffsl ffsll memmem mempcpy memrchr rawmemchr stpcpy stpncpy strchrnul
      strdup strncat strndup strnlen strpbrk strsep strcasestr strtok_r
      strerror_r strsignal strverscmp])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_STRING_MODULE_INDICATOR],
diff --git a/gnulib/import/m4/strnlen.m4 b/gnulib/import/m4/strnlen.m4
new file mode 100644
index 0000000..71b8e1b
--- /dev/null
+++ b/gnulib/import/m4/strnlen.m4
@@ -0,0 +1,30 @@
+# strnlen.m4 serial 13
+dnl Copyright (C) 2002-2003, 2005-2007, 2009-2020 Free Software Foundation,
+dnl Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_STRNLEN],
+[
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+
+  dnl Persuade glibc <string.h> to declare strnlen().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  AC_CHECK_DECLS_ONCE([strnlen])
+  if test $ac_cv_have_decl_strnlen = no; then
+    HAVE_DECL_STRNLEN=0
+  else
+    m4_pushdef([AC_LIBOBJ], [:])
+    dnl Note: AC_FUNC_STRNLEN does AC_LIBOBJ([strnlen]).
+    AC_FUNC_STRNLEN
+    m4_popdef([AC_LIBOBJ])
+    if test $ac_cv_func_strnlen_working = no; then
+      REPLACE_STRNLEN=1
+    fi
+  fi
+])
+
+# Prerequisites of lib/strnlen.c.
+AC_DEFUN([gl_PREREQ_STRNLEN], [:])
diff --git a/gnulib/import/m4/sys_random_h.m4 b/gnulib/import/m4/sys_random_h.m4
new file mode 100644
index 0000000..a964b15
--- /dev/null
+++ b/gnulib/import/m4/sys_random_h.m4
@@ -0,0 +1,52 @@
+# sys_random_h.m4 serial 4
+dnl Copyright (C) 2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_HEADER_SYS_RANDOM],
+[
+  AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
+  dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
+  gl_CHECK_NEXT_HEADERS([sys/random.h])
+  if test $ac_cv_header_sys_random_h = yes; then
+    HAVE_SYS_RANDOM_H=1
+  else
+    HAVE_SYS_RANDOM_H=0
+  fi
+  AC_SUBST([HAVE_SYS_RANDOM_H])
+
+  m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
+  if test $ac_cv_header_sys_random_h = yes; then
+    UNISTD_H_HAVE_SYS_RANDOM_H=1
+  fi
+
+  dnl Check for declarations of anything we want to poison if the
+  dnl corresponding gnulib module is not in use.
+  gl_WARN_ON_USE_PREPARE([[
+#if HAVE_SYS_RANDOM_H
+/* Additional includes are needed before <sys/random.h> on Mac OS X.  */
+# include <sys/types.h>
+# include <stdlib.h>
+# include <sys/random.h>
+#endif
+    ]],
+    [getrandom])
+])
+
+AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
+  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
+  dnl Define it also as a C macro, for the benefit of the unit tests.
+  gl_MODULE_INDICATOR_FOR_TESTS([$1])
+])
+
+AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
+[
+  GNULIB_GETRANDOM=0;     AC_SUBST([GNULIB_GETRANDOM])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_GETRANDOM=1;       AC_SUBST([HAVE_GETRANDOM])
+  REPLACE_GETRANDOM=0;    AC_SUBST([REPLACE_GETRANDOM])
+])
diff --git a/gnulib/import/m4/sys_socket_h.m4 b/gnulib/import/m4/sys_socket_h.m4
index 1471aea..bf902f0 100644
--- a/gnulib/import/m4/sys_socket_h.m4
+++ b/gnulib/import/m4/sys_socket_h.m4
@@ -1,4 +1,4 @@
-# sys_socket_h.m4 serial 24
+# sys_socket_h.m4 serial 25
 dnl Copyright (C) 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -95,6 +95,8 @@ AC_DEFUN([gl_HEADER_SYS_SOCKET],
 #include <sys/socket.h>
     ]], [socket connect accept bind getpeername getsockname getsockopt
     listen recv send recvfrom sendto setsockopt shutdown accept4])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],
diff --git a/gnulib/import/m4/sys_stat_h.m4 b/gnulib/import/m4/sys_stat_h.m4
index a5f35d4..3efba5a 100644
--- a/gnulib/import/m4/sys_stat_h.m4
+++ b/gnulib/import/m4/sys_stat_h.m4
@@ -1,4 +1,4 @@
-# sys_stat_h.m4 serial 32   -*- Autoconf -*-
+# sys_stat_h.m4 serial 33   -*- Autoconf -*-
 dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -48,7 +48,9 @@ AC_DEFUN([gl_HEADER_SYS_STAT_H],
   gl_WARN_ON_USE_PREPARE([[#include <sys/stat.h>
     ]], [fchmodat fstat fstatat futimens lchmod lstat mkdirat mkfifo mkfifoat
     mknod mknodat stat utimensat])
-]) # gl_HEADER_SYS_STAT_H
+
+  AC_REQUIRE([AC_C_RESTRICT])
+])
 
 AC_DEFUN([gl_SYS_STAT_MODULE_INDICATOR],
 [
@@ -92,7 +94,6 @@ AC_DEFUN([gl_SYS_STAT_H_DEFAULTS],
   REPLACE_FSTAT=0;      AC_SUBST([REPLACE_FSTAT])
   REPLACE_FSTATAT=0;    AC_SUBST([REPLACE_FSTATAT])
   REPLACE_FUTIMENS=0;   AC_SUBST([REPLACE_FUTIMENS])
-  REPLACE_LCHMOD=0;     AC_SUBST([REPLACE_LCHMOD])
   REPLACE_LSTAT=0;      AC_SUBST([REPLACE_LSTAT])
   REPLACE_MKDIR=0;      AC_SUBST([REPLACE_MKDIR])
   REPLACE_MKFIFO=0;     AC_SUBST([REPLACE_MKFIFO])
diff --git a/gnulib/import/m4/time_h.m4 b/gnulib/import/m4/time_h.m4
index aae0ae2..d0f8932 100644
--- a/gnulib/import/m4/time_h.m4
+++ b/gnulib/import/m4/time_h.m4
@@ -2,7 +2,7 @@
 
 # Copyright (C) 2000-2001, 2003-2007, 2009-2020 Free Software Foundation, Inc.
 
-# serial 11
+# serial 12
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -19,10 +19,12 @@ AC_DEFUN([gl_HEADER_TIME_H],
 
 AC_DEFUN([gl_HEADER_TIME_H_BODY],
 [
-  AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+
   gl_NEXT_HEADERS([time.h])
   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 dnl Check whether 'struct timespec' is declared
diff --git a/gnulib/import/m4/unistd_h.m4 b/gnulib/import/m4/unistd_h.m4
index ea2bb01..dfa38f8 100644
--- a/gnulib/import/m4/unistd_h.m4
+++ b/gnulib/import/m4/unistd_h.m4
@@ -1,4 +1,4 @@
-# unistd_h.m4 serial 77
+# unistd_h.m4 serial 80
 dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -43,11 +43,13 @@ AC_DEFUN([gl_UNISTD_H],
 #endif
     ]], [access chdir chown dup dup2 dup3 environ euidaccess faccessat fchdir
     fchownat fdatasync fsync ftruncate getcwd getdomainname getdtablesize
-    getgroups gethostname getlogin getlogin_r getpagesize getpass
+    getentropy getgroups gethostname getlogin getlogin_r getpagesize getpass
     getusershell setusershell endusershell
     group_member isatty lchown link linkat lseek pipe pipe2 pread pwrite
     readlink readlinkat rmdir sethostname sleep symlink symlinkat
     truncate ttyname_r unlink unlinkat usleep])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 AC_DEFUN([gl_UNISTD_MODULE_INDICATOR],
@@ -80,6 +82,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   GNULIB_GETCWD=0;               AC_SUBST([GNULIB_GETCWD])
   GNULIB_GETDOMAINNAME=0;        AC_SUBST([GNULIB_GETDOMAINNAME])
   GNULIB_GETDTABLESIZE=0;        AC_SUBST([GNULIB_GETDTABLESIZE])
+  GNULIB_GETENTROPY=0;           AC_SUBST([GNULIB_GETENTROPY])
   GNULIB_GETGROUPS=0;            AC_SUBST([GNULIB_GETGROUPS])
   GNULIB_GETHOSTNAME=0;          AC_SUBST([GNULIB_GETHOSTNAME])
   GNULIB_GETLOGIN=0;             AC_SUBST([GNULIB_GETLOGIN])
@@ -127,6 +130,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   HAVE_FSYNC=1;           AC_SUBST([HAVE_FSYNC])
   HAVE_FTRUNCATE=1;       AC_SUBST([HAVE_FTRUNCATE])
   HAVE_GETDTABLESIZE=1;   AC_SUBST([HAVE_GETDTABLESIZE])
+  HAVE_GETENTROPY=1;      AC_SUBST([HAVE_GETENTROPY])
   HAVE_GETGROUPS=1;       AC_SUBST([HAVE_GETGROUPS])
   HAVE_GETHOSTNAME=1;     AC_SUBST([HAVE_GETHOSTNAME])
   HAVE_GETLOGIN=1;        AC_SUBST([HAVE_GETLOGIN])
@@ -196,6 +200,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   REPLACE_UNLINKAT=0;     AC_SUBST([REPLACE_UNLINKAT])
   REPLACE_USLEEP=0;       AC_SUBST([REPLACE_USLEEP])
   REPLACE_WRITE=0;        AC_SUBST([REPLACE_WRITE])
+  UNISTD_H_HAVE_SYS_RANDOM_H=0; AC_SUBST([UNISTD_H_HAVE_SYS_RANDOM_H])
   UNISTD_H_HAVE_WINSOCK2_H=0; AC_SUBST([UNISTD_H_HAVE_WINSOCK2_H])
   UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS=0;
                            AC_SUBST([UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS])
diff --git a/gnulib/import/m4/wchar_h.m4 b/gnulib/import/m4/wchar_h.m4
index d1b7228..6c4e8a6 100644
--- a/gnulib/import/m4/wchar_h.m4
+++ b/gnulib/import/m4/wchar_h.m4
@@ -7,7 +7,7 @@ dnl with or without modifications, as long as this notice is preserved.
 
 dnl Written by Eric Blake.
 
-# wchar_h.m4 serial 44
+# wchar_h.m4 serial 46
 
 AC_DEFUN([gl_WCHAR_H],
 [
@@ -52,11 +52,14 @@ AC_DEFUN([gl_WCHAR_H],
 #include <wchar.h>
     ]],
     [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
-     wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset
+     wcsrtombs wcsnrtombs wcwidth
+     wmemchr wmemcmp wmemcpy wmemmove wmempcpy wmemset
      wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat wcscmp
      wcsncmp wcscasecmp wcsncasecmp wcscoll wcsxfrm wcsdup wcschr wcsrchr
      wcscspn wcsspn wcspbrk wcsstr wcstok wcswidth wcsftime
     ])
+
+  AC_REQUIRE([AC_C_RESTRICT])
 ])
 
 dnl Check whether <wchar.h> is usable at all.
@@ -157,6 +160,7 @@ AC_DEFUN([gl_WCHAR_H_DEFAULTS],
   GNULIB_WMEMCMP=0;     AC_SUBST([GNULIB_WMEMCMP])
   GNULIB_WMEMCPY=0;     AC_SUBST([GNULIB_WMEMCPY])
   GNULIB_WMEMMOVE=0;    AC_SUBST([GNULIB_WMEMMOVE])
+  GNULIB_WMEMPCPY=0;    AC_SUBST([GNULIB_WMEMPCPY])
   GNULIB_WMEMSET=0;     AC_SUBST([GNULIB_WMEMSET])
   GNULIB_WCSLEN=0;      AC_SUBST([GNULIB_WCSLEN])
   GNULIB_WCSNLEN=0;     AC_SUBST([GNULIB_WCSNLEN])
@@ -196,6 +200,7 @@ AC_DEFUN([gl_WCHAR_H_DEFAULTS],
   HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])
   HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])
   HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])
+  HAVE_WMEMPCPY=1;      AC_SUBST([HAVE_WMEMPCPY])
   HAVE_WMEMSET=1;       AC_SUBST([HAVE_WMEMSET])
   HAVE_WCSLEN=1;        AC_SUBST([HAVE_WCSLEN])
   HAVE_WCSNLEN=1;       AC_SUBST([HAVE_WCSNLEN])
diff --git a/gnulib/import/m4/wint_t.m4 b/gnulib/import/m4/wint_t.m4
index 877fd86..5e6c178 100644
--- a/gnulib/import/m4/wint_t.m4
+++ b/gnulib/import/m4/wint_t.m4
@@ -1,4 +1,4 @@
-# wint_t.m4 serial 7
+# wint_t.m4 serial 8
 dnl Copyright (C) 2003, 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -35,7 +35,7 @@ AC_DEFUN([gt_TYPE_WINT_T],
     AC_CACHE_CHECK([whether wint_t is too small],
       [gl_cv_type_wint_t_too_small],
       [AC_COMPILE_IFELSE(
-           [AC_LANG_PROGRAM([[
+         [AC_LANG_PROGRAM([[
 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
    <wchar.h>.
    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
@@ -46,10 +46,10 @@ AC_DEFUN([gt_TYPE_WINT_T],
 # include <time.h>
 #endif
 #include <wchar.h>
-              int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1];
-              ]])],
-           [gl_cv_type_wint_t_too_small=no],
-           [gl_cv_type_wint_t_too_small=yes])])
+            int verify[sizeof (wint_t) < sizeof (int) ? -1 : 1];
+            ]])],
+         [gl_cv_type_wint_t_too_small=no],
+         [gl_cv_type_wint_t_too_small=yes])])
     if test $gl_cv_type_wint_t_too_small = yes; then
       GNULIB_OVERRIDES_WINT_T=1
     else
diff --git a/gnulib/import/m4/wmemchr.m4 b/gnulib/import/m4/wmemchr.m4
new file mode 100644
index 0000000..62bd89c
--- /dev/null
+++ b/gnulib/import/m4/wmemchr.m4
@@ -0,0 +1,32 @@
+# wmemchr.m4 serial 4
+dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_WMEMCHR],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
+  dnl provide this function as an inline function definition.
+  AC_CACHE_CHECK([for wmemchr], [gl_cv_func_wmemchr],
+    [AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM([[
+/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
+   <wchar.h>.
+   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
+   before <wchar.h>.  */
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <wchar.h>
+]],
+          [[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]])
+       ],
+       [gl_cv_func_wmemchr=yes],
+       [gl_cv_func_wmemchr=no])
+    ])
+  if test $gl_cv_func_wmemchr = no; then
+    HAVE_WMEMCHR=0
+  fi
+])
diff --git a/gnulib/import/m4/wmempcpy.m4 b/gnulib/import/m4/wmempcpy.m4
new file mode 100644
index 0000000..1795fc8
--- /dev/null
+++ b/gnulib/import/m4/wmempcpy.m4
@@ -0,0 +1,21 @@
+# wmempcpy.m4 serial 1
+dnl Copyright (C) 2020 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_WMEMPCPY],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+
+  dnl Persuade glibc <wchar.h> to declare wmempcpy().
+  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+  dnl The wmempcpy() declaration in lib/wchar.in.h uses 'restrict'.
+  AC_REQUIRE([AC_C_RESTRICT])
+
+  AC_CHECK_FUNCS_ONCE([wmempcpy])
+  if test $ac_cv_func_wmempcpy = no; then
+    HAVE_WMEMPCPY=0
+  fi
+])