gnulib: update

[Akim Demaille]

commit 8cd61aa72566d82be725b81ab9d4347f2d2d70dd
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Wed Jun 15 07:00:39 2022 +0200

    gnulib: update

diff --git a/bootstrap b/bootstrap
index 63e76dee..1f375eef 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2021-04-11.09; # UTC
+scriptversion=2022-06-04.00; # UTC
 
 # Bootstrap this package from checked-out sources.
 
-# Copyright (C) 2003-2021 Free Software Foundation, Inc.
+# Copyright (C) 2003-2022 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -487,7 +487,7 @@ fi
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
 found_aux_dir=no
-grep '^[        ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'\])' configure.ac \
+grep '^[        ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'])' configure.ac \
     >/dev/null && found_aux_dir=yes
 grep '^[        ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
     >/dev/null && found_aux_dir=yes
@@ -763,9 +763,26 @@ if $use_gnulib; then
       shallow=
       if test -z "$GNULIB_REVISION"; then
         git clone -h 2>&1 | grep -- --depth > /dev/null && shallow='--depth 2'
+        git clone $shallow ${GNULIB_URL:-$default_gnulib_url} "$gnulib_path" \
+          || cleanup_gnulib
+      else
+        git fetch -h 2>&1 | grep -- --depth > /dev/null && shallow='--depth 2'
+        mkdir -p "$gnulib_path"
+        # Only want a shallow checkout of $GNULIB_REVISION, but git does not
+        # support cloning by commit hash. So attempt a shallow fetch by commit
+        # hash to minimize the amount of data downloaded and changes needed to
+        # be processed, which can drastically reduce download and processing
+        # time for checkout. If the fetch by commit fails, a shallow fetch can
+        # not be performed because we do not know what the depth of the commit
+        # is without fetching all commits. So fallback to fetching all commits.
+        git -C "$gnulib_path" init
+        git -C "$gnulib_path" remote add origin \
+            ${GNULIB_URL:-$default_gnulib_url}
+        git -C "$gnulib_path" fetch $shallow origin "$GNULIB_REVISION" \
+          || git -C "$gnulib_path" fetch origin \
+          || cleanup_gnulib
+        git -C "$gnulib_path" reset --hard FETCH_HEAD
       fi
-      git clone $shallow ${GNULIB_URL:-$default_gnulib_url} "$gnulib_path" \
-        || cleanup_gnulib
 
       trap - 1 2 13 15
     fi
@@ -1093,7 +1110,7 @@ bootstrap_epilogue
 
 echo "$0: done.  Now you can run './configure'."
 
-# Local variables:
+# Local Variables:
 # eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
diff --git a/gnulib b/gnulib
index 4bdc327d..d682f8de 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 4bdc327dbda59dcdbfa0f983a4f35c4a4ec3578c
+Subproject commit d682f8de7f9d384f4cfc482a3ba2960329a8db21
diff --git a/lib/.gitignore b/lib/.gitignore
index 374ccdd9..fac66ae4 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -371,7 +371,9 @@
 /stdint.in.h
 /stdio--.h
 /stdio-impl.h
+/stdio-read.c
 /stdio-safer.h
+/stdio-write.c
 /stdio.h
 /stdio.in.h
 /stdlib.h