Update gnulib

This updates gnulib to a relatively recent commit.  Most of this was
done by the gnulib import script; the only change I made was to
update-gnulib.sh.

Tested on x86-64 Fedora 34.  I also did a mingw cross build.

1 files changed, 19 insertions, 32 deletions

diff --git a/gnulib/import/m4/realloc.m4 b/gnulib/import/m4/realloc.m4
index 6f4461d..86e57c2 100644
--- a/gnulib/import/m4/realloc.m4
+++ b/gnulib/import/m4/realloc.m4
@@ -1,21 +1,21 @@
-# realloc.m4 serial 19
-dnl Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
+# realloc.m4 serial 26
+dnl Copyright (C) 2007, 2009-2022 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.
 
 # This is adapted with modifications from upstream Autoconf here:
-# https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=04be2b7a29d65d9a08e64e8e56e594c91749598c
+# https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/functions.m4?id=v2.70#n1455
 AC_DEFUN([_AC_FUNC_REALLOC_IF],
 [
   AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
-  AC_CACHE_CHECK([for GNU libc compatible realloc],
+  AC_CACHE_CHECK([whether realloc (0, 0) returns nonnull],
     [ac_cv_func_realloc_0_nonnull],
     [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <stdlib.h>
           ]],
-          [[char *p = realloc (0, 0);
+          [[void *p = realloc (0, 0);
             int result = !p;
             free (p);
             return result;]])
@@ -24,53 +24,40 @@ AC_DEFUN([_AC_FUNC_REALLOC_IF],
        [ac_cv_func_realloc_0_nonnull=no],
        [case "$host_os" in
           # Guess yes on platforms where we know the result.
-          *-gnu* | gnu* | *-musl* | freebsd* | netbsd* | openbsd* \
-          | hpux* | solaris* | cygwin* | mingw*)
+          *-gnu* | freebsd* | netbsd* | openbsd* | bitrig* \
+          | gnu* | *-musl* | midnightbsd* \
+          | hpux* | solaris* | cygwin* | mingw* | msys* )
             ac_cv_func_realloc_0_nonnull="guessing yes" ;;
           # If we don't know, obey --enable-cross-guesses.
           *) ac_cv_func_realloc_0_nonnull="$gl_cross_guess_normal" ;;
         esac
        ])
     ])
-  case "$ac_cv_func_realloc_0_nonnull" in
-    *yes)
-      $1
-      ;;
-    *)
-      $2
-      ;;
-  esac
+  AS_CASE([$ac_cv_func_realloc_0_nonnull], [*yes], [$1], [$2])
 ])# AC_FUNC_REALLOC
 
 # gl_FUNC_REALLOC_GNU
 # -------------------
-# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace
-# realloc if it is not.
+# Replace realloc if it is not compatible with GNU libc.
 AC_DEFUN([gl_FUNC_REALLOC_GNU],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
-  dnl _AC_FUNC_REALLOC_IF is defined in Autoconf.
-  _AC_FUNC_REALLOC_IF(
-    [AC_DEFINE([HAVE_REALLOC_GNU], [1],
-               [Define to 1 if your system has a GNU libc compatible 'realloc'
-                function, and to 0 otherwise.])],
-    [AC_DEFINE([HAVE_REALLOC_GNU], [0])
-     REPLACE_REALLOC=1
-    ])
+  AC_REQUIRE([gl_FUNC_REALLOC_POSIX])
+  if test $REPLACE_REALLOC_FOR_REALLOC_GNU = 0; then
+    _AC_FUNC_REALLOC_IF([], [REPLACE_REALLOC_FOR_REALLOC_GNU=1])
+  fi
 ])# gl_FUNC_REALLOC_GNU
 
 # gl_FUNC_REALLOC_POSIX
 # ---------------------
 # Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
-# fails), and replace realloc if it is not.
+# fails, and doesn't mess up with ptrdiff_t overflow),
+# and replace realloc if it is not.
 AC_DEFUN([gl_FUNC_REALLOC_POSIX],
 [
   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
-  AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
-  if test $gl_cv_func_malloc_posix = yes; then
-    AC_DEFINE([HAVE_REALLOC_POSIX], [1],
-      [Define if the 'realloc' function is POSIX compliant.])
-  else
-    REPLACE_REALLOC=1
+  AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
+  if test $REPLACE_MALLOC_FOR_MALLOC_POSIX = 1; then
+    REPLACE_REALLOC_FOR_REALLOC_POSIX=1
   fi
 ])