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[PATCH 3/7] maint: update bootstrap, (re-)enable po file generation


From: Eric Blake
Subject: [PATCH 3/7] maint: update bootstrap, (re-)enable po file generation
Date: Sat, 8 May 2021 06:28:18 -0500

In commit 4694c4e67, I disabled bootstrap pulling in po files, because
I got an error while attempting to get them, and remembered that while
the experimental 2.0 has a .pot file, branch-1.4 (and the 1.4.18
release) historically did not.  Basically, since the translation
project does not have any m4.pot corresponding to a released m4 that
needs it, they deleted tp/latest/m4, and with nothing to pull from,
rsync fails.  I did not, however, realize that commit 610290de had
intentionally added translation support, such that m4 1.4.19 WILL have
translations; so until I get that directory reinstated by releasing
1.4.18b, I'll just use './bootstrap --skip-po'.

Meanwhile, Gary's upstream bootstrap has had some commits
(https://github.com/gnulib-modules/bootstrap.git)
Regenerate them via:
for f in gl/build-aux/*; do cp ~/bootstrap/build-aux/$(basename $f) $f; done
gl/build-aux/inline-source gl/build-aux/bootstrap.in > bootstrap

* gl/build-aux/*: Sync from upstream.
* bootstrap: Regenerate.
* bootstrap.conf (m4_bootstrap_options_prep): Re-enable po.
* NEWS: Document this as intentional.
Fixes: 4694c4e67
---
 NEWS                        |    7 +
 bootstrap                   | 1061 +++++++++++++++++++++++------------
 bootstrap.conf              |   11 +-
 gl/build-aux/bootstrap.in   |  225 +++++---
 gl/build-aux/extract-trace  |  215 ++++---
 gl/build-aux/funclib.sh     |  329 +++++++----
 gl/build-aux/inline-source  |   38 +-
 gl/build-aux/options-parser |  284 ++++++----
 8 files changed, 1408 insertions(+), 762 deletions(-)

diff --git a/NEWS b/NEWS
index 3baed833..56b85fc1 100644
--- a/NEWS
+++ b/NEWS
@@ -6,6 +6,13 @@ GNU M4 NEWS - User visible changes.
    modern systems have enough memory to benefit from fewer hash collisions
    by default.

+** Introduce the use of gettext, with the immediate benefit of nicer
+   UTF-8 author names.  Over time, more translations of program messages
+   will become available.
+
+** A number of portability improvements inherited from gnulib.
+
+
 * Noteworthy changes in release 1.4.18 (2016-12-31) [stable]

 ** Diagnose --word-regexp as unsupported if it was not configured.
diff --git a/bootstrap b/bootstrap
index f245cada..b9326ba8 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,37 +1,30 @@
 #! /bin/sh
 ## DO NOT EDIT - This file generated from build-aux/bootstrap.in
-##               by inline-source v2014-01-03.01
+##               by inline-source v2019-02-19.15

 # Bootstrap an Autotooled package from checked-out sources.
 # Written by Gary V. Vaughan, 2010
+# Inspired by a script written by Paul Eggert.

-# Copyright (C) 2010-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.

-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# You should place a copy of this script under version control in the
+# top-level directory of your project.  The intent is that all
+# customization can be done with a `bootstrap.conf` file also maintained
+# in your version control.

-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Originally written by Paul Eggert.  The canonical version of this
-# script is maintained as build-aux/bootstrap in gnulib, however, to
-# be useful to your project, you should place a copy of it under
-# version control in the top-level directory of your project.  The
-# intent is that all customization can be done with a bootstrap.conf
-# file also maintained in your version control; gnulib comes with a
-# template build-aux/bootstrap.conf to get you started.
-
-# Please report bugs or propose patches to bug-gnulib@gnu.org.
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>


 ## ------ ##
@@ -139,7 +132,7 @@ package_bugreport=
 doc_base=
 gnulib_mk=
 gnulib_name=
-local_gl_dir=
+local_gl_path=
 source_base=
 tests_base=

@@ -167,6 +160,9 @@ gnulib_non_module_files="
 gnulib_path=
 gnulib_url=

+# Date from which to clone github, to avoid a full clone.
+gnulib_clone_since=
+
 # Additional gnulib-tool options to use.
 gnulib_tool_options="
         --no-changelog
@@ -231,35 +227,25 @@ vc_ignore=

 # Source required external libraries:
 # Set a version string for this script.
-scriptversion=2014-01-03.01; # UTC
+scriptversion=2019-02-19.15; # UTC

 # General shell script boiler plate, and helper functions.
 # Written by Gary V. Vaughan, 2004

-# Copyright (C) 2004-2014, 2016-2017, 2020 Free Software Foundation,
-# Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-# 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
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-
-# As a special exception to the GNU General Public License, if you distribute
-# this file as part of a program or library that is built using GNU Libtool,
-# you may include this file under the same distribution terms that you use
-# for the rest of that program.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNES FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2004-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.
+
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>


 ## ------ ##
@@ -308,9 +294,6 @@ do
        fi"
 done

-# CDPATH.
-(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
-
 # Make sure IFS has a sensible default
 sp=' '
 nl='
@@ -327,6 +310,26 @@ if test "${PATH_SEPARATOR+set}" != set; then
 fi


+# func_unset VAR
+# --------------
+# Portably unset VAR.
+# In some shells, an 'unset VAR' statement leaves a non-zero return
+# status if VAR is already unset, which might be problematic if the
+# statement is used at the end of a function (thus poisoning its return
+# value) or when 'set -e' is active (causing even a spurious abort of
+# the script in this case).
+func_unset ()
+{
+    { eval $1=; (eval unset $1) >/dev/null 2>&1 && eval unset $1 || : ; }
+}
+
+
+# Make sure CDPATH doesn't cause `cd` commands to output the target dir.
+func_unset CDPATH
+
+# Make sure ${,E,F}GREP behave sanely.
+func_unset GREP_OPTIONS
+

 ## ------------------------- ##
 ## Locate command utilities. ##
@@ -360,7 +363,7 @@ func_path_progs ()

     _G_path_prog_max=0
     _G_path_prog_found=false
-    _G_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+    _G_save_IFS=$IFS; IFS=${PATH_SEPARATOR-:}
     for _G_dir in $_G_PATH; do
       IFS=$_G_save_IFS
       test -z "$_G_dir" && _G_dir=.
@@ -427,7 +430,7 @@ test -z "$SED" && {
     rm -f conftest.in conftest.tmp conftest.nl conftest.out
   }

-  func_path_progs "sed gsed" func_check_prog_sed $PATH:/usr/xpg4/bin
+  func_path_progs "sed gsed" func_check_prog_sed "$PATH:/usr/xpg4/bin"
   rm -f conftest.sed
   SED=$func_path_progs_result
 }
@@ -463,7 +466,7 @@ test -z "$GREP" && {
     rm -f conftest.in conftest.tmp conftest.nl conftest.out
   }

-  func_path_progs "grep ggrep" func_check_prog_grep $PATH:/usr/xpg4/bin
+  func_path_progs "grep ggrep" func_check_prog_grep "$PATH:/usr/xpg4/bin"
   GREP=$func_path_progs_result
 }

@@ -748,16 +751,16 @@ if test yes = "$_G_HAVE_PLUSEQ_OP"; then
   {
     $debug_cmd

-    func_quote_for_eval "$2"
-    eval "$1+=\\ \$func_quote_for_eval_result"
+    func_quote_arg pretty "$2"
+    eval "$1+=\\ \$func_quote_arg_result"
   }'
 else
   func_append_quoted ()
   {
     $debug_cmd

-    func_quote_for_eval "$2"
-    eval "$1=\$$1\\ \$func_quote_for_eval_result"
+    func_quote_arg pretty "$2"
+    eval "$1=\$$1\\ \$func_quote_arg_result"
   }
 fi

@@ -1259,85 +1262,199 @@ func_relative_path ()
 }


-# func_quote_for_eval ARG...
-# --------------------------
-# Aesthetically quote ARGs to be evaled later.
-# This function returns two values:
-#   i) func_quote_for_eval_result
-#      double-quoted, suitable for a subsequent eval
-#  ii) func_quote_for_eval_unquoted_result
-#      has all characters that are still active within double
-#      quotes backslashified.
-func_quote_for_eval ()
+# func_quote_portable EVAL ARG
+# ----------------------------
+# Internal function to portably implement func_quote_arg.  Note that we still
+# keep attention to performance here so we as much as possible try to avoid
+# calling sed binary (so far O(N) complexity as long as func_append is O(1)).
+func_quote_portable ()
 {
     $debug_cmd

-    func_quote_for_eval_unquoted_result=
-    func_quote_for_eval_result=
-    while test 0 -lt $#; do
-      case $1 in
+    func_quote_portable_result=$2
+
+    # one-time-loop (easy break)
+    while true
+    do
+      if $1; then
+        func_quote_portable_result=`$ECHO "$2" | $SED \
+          -e "$sed_double_quote_subst" -e "$sed_double_backslash"`
+        break
+      fi
+
+      # Quote for eval.
+      case $func_quote_portable_result in
         *[\\\`\"\$]*)
-         _G_unquoted_arg=`printf '%s\n' "$1" |$SED "$sed_quote_subst"` ;;
-        *)
-          _G_unquoted_arg=$1 ;;
-      esac
-      if test -n "$func_quote_for_eval_unquoted_result"; then
-       func_append func_quote_for_eval_unquoted_result " $_G_unquoted_arg"
-      else
-        func_append func_quote_for_eval_unquoted_result "$_G_unquoted_arg"
-      fi
+          case $func_quote_portable_result in
+            *[\[\*\?]*)
+              func_quote_portable_result=`$ECHO "$func_quote_portable_result" \
+                  | $SED "$sed_quote_subst"`
+              break
+              ;;
+          esac

-      case $_G_unquoted_arg in
-        # Double-quote args containing shell metacharacters to delay
-        # word splitting, command substitution and variable expansion
-        # for a subsequent eval.
-        # Many Bourne shells cannot handle close brackets correctly
-        # in scan sets, so we specify it separately.
-        *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \  ]*|*]*|"")
-          _G_quoted_arg=\"$_G_unquoted_arg\"
+          func_quote_portable_old_IFS=$IFS
+          for _G_char in '\' '`' '"' '$'
+          do
+            # STATE($1) PREV($2) SEPARATOR($3)
+            set start "" ""
+            
func_quote_portable_result=dummy"$_G_char$func_quote_portable_result$_G_char"dummy
+            IFS=$_G_char
+            for _G_part in $func_quote_portable_result
+            do
+              case $1 in
+              quote)
+                func_append func_quote_portable_result "$3$2"
+                set quote "$_G_part" "\\$_G_char"
+                ;;
+              start)
+                set first "" ""
+                func_quote_portable_result=
+                ;;
+              first)
+                set quote "$_G_part" ""
+                ;;
+              esac
+            done
+          done
+          IFS=$func_quote_portable_old_IFS
           ;;
-        *)
-          _G_quoted_arg=$_G_unquoted_arg
-         ;;
+        *) ;;
       esac
-
-      if test -n "$func_quote_for_eval_result"; then
-       func_append func_quote_for_eval_result " $_G_quoted_arg"
-      else
-        func_append func_quote_for_eval_result "$_G_quoted_arg"
-      fi
-      shift
+      break
     done
-}

-
-# func_quote_for_expand ARG
-# -------------------------
-# Aesthetically quote ARG to be evaled later; same as above,
-# but do not quote variable references.
-func_quote_for_expand ()
-{
-    $debug_cmd
-
-    case $1 in
-      *[\\\`\"]*)
-       _G_arg=`$ECHO "$1" | $SED \
-           -e "$sed_double_quote_subst" -e "$sed_double_backslash"` ;;
-      *)
-        _G_arg=$1 ;;
-    esac
-
-    case $_G_arg in
-      # Double-quote args containing shell metacharacters to delay
-      # word splitting and command substitution for a subsequent eval.
-      # Many Bourne shells cannot handle close brackets correctly
+    func_quote_portable_unquoted_result=$func_quote_portable_result
+    case $func_quote_portable_result in
+      # double-quote args containing shell metacharacters to delay
+      # word splitting, command substitution and variable expansion
+      # for a subsequent eval.
+      # many bourne shells cannot handle close brackets correctly
       # in scan sets, so we specify it separately.
       *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \    ]*|*]*|"")
-        _G_arg=\"$_G_arg\"
+        func_quote_portable_result=\"$func_quote_portable_result\"
         ;;
     esac
+}

-    func_quote_for_expand_result=$_G_arg
+
+# func_quotefast_eval ARG
+# -----------------------
+# Quote one ARG (internal).  This is equivalent to 'func_quote_arg eval ARG',
+# but optimized for speed.  Result is stored in $func_quotefast_eval.
+if test xyes = `(x=; printf -v x %q yes; echo x"$x") 2>/dev/null`; then
+  printf -v _GL_test_printf_tilde %q '~'
+  if test '\~' = "$_GL_test_printf_tilde"; then
+    func_quotefast_eval ()
+    {
+      printf -v func_quotefast_eval_result %q "$1"
+    }
+  else
+    # Broken older Bash implementations.  Make those faster too if possible.
+    func_quotefast_eval ()
+    {
+      case $1 in
+        '~'*)
+          func_quote_portable false "$1"
+          func_quotefast_eval_result=$func_quote_portable_result
+          ;;
+        *)
+          printf -v func_quotefast_eval_result %q "$1"
+          ;;
+      esac
+    }
+  fi
+else
+  func_quotefast_eval ()
+  {
+    func_quote_portable false "$1"
+    func_quotefast_eval_result=$func_quote_portable_result
+  }
+fi
+
+
+# func_quote_arg MODEs ARG
+# ------------------------
+# Quote one ARG to be evaled later.  MODEs argument may contain zero or more
+# specifiers listed below separated by ',' character.  This function returns 
two
+# values:
+#   i) func_quote_arg_result
+#      double-quoted (when needed), suitable for a subsequent eval
+#  ii) func_quote_arg_unquoted_result
+#      has all characters that are still active within double
+#      quotes backslashified.  Available only if 'unquoted' is specified.
+#
+# Available modes:
+# ----------------
+# 'eval' (default)
+#       - escape shell special characters
+# 'expand'
+#       - the same as 'eval';  but do not quote variable references
+# 'pretty'
+#       - request aesthetic output, i.e. '"a b"' instead of 'a\ b'.  This might
+#         be used later in func_quote to get output like: 'echo "a b"' instead
+#         of 'echo a\ b'.  This is slower than default on some shells.
+# 'unquoted'
+#       - produce also $func_quote_arg_unquoted_result which does not contain
+#         wrapping double-quotes.
+#
+# Examples for 'func_quote_arg pretty,unquoted string':
+#
+#   string      | *_result              | *_unquoted_result
+#   ------------+-----------------------+-------------------
+#   "           | \"                    | \"
+#   a b         | "a b"                 | a b
+#   "a b"       | "\"a b\""             | \"a b\"
+#   *           | "*"                   | *
+#   z="${x-$y}" | "z=\"\${x-\$y}\""     | z=\"\${x-\$y}\"
+#
+# Examples for 'func_quote_arg pretty,unquoted,expand string':
+#
+#   string        |   *_result          |  *_unquoted_result
+#   --------------+---------------------+--------------------
+#   z="${x-$y}"   | "z=\"${x-$y}\""     | z=\"${x-$y}\"
+func_quote_arg ()
+{
+    _G_quote_expand=false
+    case ,$1, in
+      *,expand,*)
+        _G_quote_expand=:
+        ;;
+    esac
+
+    case ,$1, in
+      *,pretty,*|*,expand,*|*,unquoted,*)
+        func_quote_portable $_G_quote_expand "$2"
+        func_quote_arg_result=$func_quote_portable_result
+        func_quote_arg_unquoted_result=$func_quote_portable_unquoted_result
+        ;;
+      *)
+        # Faster quote-for-eval for some shells.
+        func_quotefast_eval "$2"
+        func_quote_arg_result=$func_quotefast_eval_result
+        ;;
+    esac
+}
+
+
+# func_quote MODEs ARGs...
+# ------------------------
+# Quote all ARGs to be evaled later and join them into single command.  See
+# func_quote_arg's description for more info.
+func_quote ()
+{
+    $debug_cmd
+    _G_func_quote_mode=$1 ; shift
+    func_quote_result=
+    while test 0 -lt $#; do
+      func_quote_arg "$_G_func_quote_mode" "$1"
+      if test -n "$func_quote_result"; then
+        func_append func_quote_result " $func_quote_arg_result"
+      else
+        func_append func_quote_result "$func_quote_arg_result"
+      fi
+      shift
+    done
 }


@@ -1383,8 +1500,8 @@ func_show_eval ()
     _G_cmd=$1
     _G_fail_exp=${2-':'}

-    func_quote_for_expand "$_G_cmd"
-    eval "func_notquiet $func_quote_for_expand_result"
+    func_quote_arg pretty,expand "$_G_cmd"
+    eval "func_notquiet $func_quote_arg_result"

     $opt_dry_run || {
       eval "$_G_cmd"
@@ -1409,8 +1526,8 @@ func_show_eval_locale ()
     _G_fail_exp=${2-':'}

     $opt_quiet || {
-      func_quote_for_expand "$_G_cmd"
-      eval "func_echo $func_quote_for_expand_result"
+      func_quote_arg expand,pretty "$_G_cmd"
+      eval "func_echo $func_quote_arg_result"
     }

     $opt_dry_run || {
@@ -1537,31 +1654,26 @@ func_lt_ver ()
 # End:
 #! /bin/sh

-# Set a version string for this script.
-scriptversion=2014-01-07.03; # UTC
-
 # A portable, pluggable option parser for Bourne shell.
 # Written by Gary V. Vaughan, 2010

-# Copyright (C) 2010-2014, 2016-2017, 2020 Free Software Foundation,
-# Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.

-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>

-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+# Set a version string for this script.
+scriptversion=2019-02-19.15; # UTC


 ## ------ ##
@@ -1584,7 +1696,7 @@ scriptversion=2014-01-07.03; # UTC
 #
 # In order for the '--version' option to work, you will need to have a
 # suitably formatted comment like the one at the top of this file
-# starting with '# Written by ' and ending with '# warranty; '.
+# starting with '# Written by ' and ending with '# Copyright'.
 #
 # For '-h' and '--help' to work, you will also need a one line
 # description of your script's purpose in a comment directly above the
@@ -1596,7 +1708,7 @@ scriptversion=2014-01-07.03; # UTC
 # to display verbose messages only when your user has specified
 # '--verbose'.
 #
-# After sourcing this file, you can plug processing for additional
+# After sourcing this file, you can plug in processing for additional
 # options by amending the variables from the 'Configuration' section
 # below, and following the instructions in the 'Option parsing'
 # section further down.
@@ -1645,8 +1757,8 @@ fatal_help="Try '\$progname --help' for more information."
 ## ------------------------- ##

 # This section contains functions for adding, removing, and running hooks
-# to the main code.  A hook is just a named list of of function, that can
-# be run in order later on.
+# in the main code.  A hook is just a list of function names that can be
+# run in order later on.

 # func_hookable FUNC_NAME
 # -----------------------
@@ -1679,7 +1791,8 @@ func_add_hook ()

 # func_remove_hook FUNC_NAME HOOK_FUNC
 # ------------------------------------
-# Remove HOOK_FUNC from the list of functions called by FUNC_NAME.
+# Remove HOOK_FUNC from the list of hook functions to be called by
+# FUNC_NAME.
 func_remove_hook ()
 {
     $debug_cmd
@@ -1688,10 +1801,28 @@ func_remove_hook ()
 }


+# func_propagate_result FUNC_NAME_A FUNC_NAME_B
+# ---------------------------------------------
+# If the *_result variable of FUNC_NAME_A _is set_, assign its value to
+# *_result variable of FUNC_NAME_B.
+func_propagate_result ()
+{
+    $debug_cmd
+
+    func_propagate_result_result=:
+    if eval "test \"\${${1}_result+set}\" = set"
+    then
+      eval "${2}_result=\$${1}_result"
+    else
+      func_propagate_result_result=false
+    fi
+}
+
+
 # func_run_hooks FUNC_NAME [ARG]...
 # ---------------------------------
 # Run all hook functions registered to FUNC_NAME.
-# It is assumed that the list of hook functions contains nothing more
+# It's assumed that the list of hook functions contains nothing more
 # than a whitespace-delimited list of legal shell function names, and
 # no effort is wasted trying to catch shell meta-characters or preserve
 # whitespace.
@@ -1701,22 +1832,19 @@ func_run_hooks ()

     case " $hookable_fns " in
       *" $1 "*) ;;
-      *) func_fatal_error "'$1' does not support hook funcions.n" ;;
+      *) func_fatal_error "'$1' does not support hook functions." ;;
     esac

     eval _G_hook_fns=\$$1_hooks; shift

     for _G_hook in $_G_hook_fns; do
-      eval $_G_hook '"$@"'
-
-      # store returned options list back into positional
-      # parameters for next 'cmd' execution.
-      eval _G_hook_result=\$${_G_hook}_result
-      eval set dummy "$_G_hook_result"; shift
+      func_unset "${_G_hook}_result"
+      eval $_G_hook '${1+"$@"}'
+      func_propagate_result $_G_hook func_run_hooks
+      if $func_propagate_result_result; then
+        eval set dummy "$func_run_hooks_result"; shift
+      fi
     done
-
-    func_quote_for_eval ${1+"$@"}
-    func_run_hooks_result=$func_quote_for_eval_result
 }


@@ -1726,10 +1854,18 @@ func_run_hooks ()
 ## --------------- ##

 # In order to add your own option parsing hooks, you must accept the
-# full positional parameter list in your hook function, remove any
-# options that you action, and then pass back the remaining unprocessed
-# options in '<hooked_function_name>_result', escaped suitably for
-# 'eval'.  Like this:
+# full positional parameter list from your hook function.  You may remove
+# or edit any options that you action, and then pass back the remaining
+# unprocessed options in '<hooked_function_name>_result', escaped
+# suitably for 'eval'.
+#
+# The '<hooked_function_name>_result' variable is automatically unset
+# before your hook gets called; for best performance, only set the
+# *_result variable when necessary (i.e. don't call the 'func_quote'
+# function unnecessarily because it can be an expensive operation on some
+# machines).
+#
+# Like this:
 #
 #    my_options_prep ()
 #    {
@@ -1739,9 +1875,8 @@ func_run_hooks ()
 #        usage_message=$usage_message'
 #      -s, --silent       don'\''t print informational messages
 #    '
-#
-#        func_quote_for_eval ${1+"$@"}
-#        my_options_prep_result=$func_quote_for_eval_result
+#        # No change in '$@' (ignored completely by this hook).  Leave
+#        # my_options_prep_result variable intact.
 #    }
 #    func_add_hook func_options_prep my_options_prep
 #
@@ -1750,25 +1885,36 @@ func_run_hooks ()
 #    {
 #        $debug_cmd
 #
-#        # Note that for efficiency, we parse as many options as we can
+#        args_changed=false
+#
+#        # Note that, for efficiency, we parse as many options as we can
 #        # recognise in a loop before passing the remainder back to the
 #        # caller on the first unrecognised argument we encounter.
 #        while test $# -gt 0; do
 #          opt=$1; shift
 #          case $opt in
-#            --silent|-s) opt_silent=: ;;
+#            --silent|-s) opt_silent=:
+#                         args_changed=:
+#                         ;;
 #            # Separate non-argument short options:
 #            -s*)         func_split_short_opt "$_G_opt"
 #                         set dummy "$func_split_short_opt_name" \
 #                             "-$func_split_short_opt_arg" ${1+"$@"}
 #                         shift
+#                         args_changed=:
 #                         ;;
-#            *)            set dummy "$_G_opt" "$*"; shift; break ;;
+#            *)           # Make sure the first unrecognised option "$_G_opt"
+#                         # is added back to "$@" in case we need it later,
+#                         # if $args_changed was set to 'true'.
+#                         set dummy "$_G_opt" ${1+"$@"}; shift; break ;;
 #          esac
 #        done
 #
-#        func_quote_for_eval ${1+"$@"}
-#        my_silent_option_result=$func_quote_for_eval_result
+#        # Only call 'func_quote' here if we processed at least one argument.
+#        if $args_changed; then
+#          func_quote eval ${1+"$@"}
+#          my_silent_option_result=$func_quote_result
+#        fi
 #    }
 #    func_add_hook func_parse_options my_silent_option
 #
@@ -1779,17 +1925,26 @@ func_run_hooks ()
 #
 #        $opt_silent && $opt_verbose && func_fatal_help "\
 #    '--silent' and '--verbose' options are mutually exclusive."
-#
-#        func_quote_for_eval ${1+"$@"}
-#        my_option_validation_result=$func_quote_for_eval_result
 #    }
 #    func_add_hook func_validate_options my_option_validation
 #
-# You'll alse need to manually amend $usage_message to reflect the extra
+# You'll also need to manually amend $usage_message to reflect the extra
 # options you parse.  It's preferable to append if you can, so that
 # multiple option parsing hooks can be added safely.


+# func_options_finish [ARG]...
+# ----------------------------
+# Finishing the option parse loop (call 'func_options' hooks ATM).
+func_options_finish ()
+{
+    $debug_cmd
+
+    func_run_hooks func_options ${1+"$@"}
+    func_propagate_result func_run_hooks func_options_finish
+}
+
+
 # func_options [ARG]...
 # ---------------------
 # All the functions called inside func_options are hookable. See the
@@ -1799,17 +1954,27 @@ func_options ()
 {
     $debug_cmd

-    func_options_prep ${1+"$@"}
-    eval func_parse_options \
-        ${func_options_prep_result+"$func_options_prep_result"}
-    eval func_validate_options \
-        ${func_parse_options_result+"$func_parse_options_result"}
+    _G_options_quoted=false

-    eval func_run_hooks func_options \
-        ${func_validate_options_result+"$func_validate_options_result"}
+    for my_func in options_prep parse_options validate_options options_finish
+    do
+      func_unset func_${my_func}_result
+      func_unset func_run_hooks_result
+      eval func_$my_func '${1+"$@"}'
+      func_propagate_result func_$my_func func_options
+      if $func_propagate_result_result; then
+        eval set dummy "$func_options_result"; shift
+        _G_options_quoted=:
+      fi
+    done

-    # save modified positional parameters for caller
-    func_options_result=$func_run_hooks_result
+    $_G_options_quoted || {
+      # As we (func_options) are top-level options-parser function and
+      # nobody quoted "$@" for us yet, we need to do it explicitly for
+      # caller.
+      func_quote eval ${1+"$@"}
+      func_options_result=$func_quote_result
+    }
 }


@@ -1818,9 +1983,8 @@ func_options ()
 # All initialisations required before starting the option parse loop.
 # Note that when calling hook functions, we pass through the list of
 # positional parameters.  If a hook function modifies that list, and
-# needs to propogate that back to rest of this script, then the complete
-# modified list must be put in 'func_run_hooks_result' before
-# returning.
+# needs to propagate that back to rest of this script, then the complete
+# modified list must be put in 'func_run_hooks_result' before returning.
 func_hookable func_options_prep
 func_options_prep ()
 {
@@ -1831,9 +1995,7 @@ func_options_prep ()
     opt_warning_types=

     func_run_hooks func_options_prep ${1+"$@"}
-
-    # save modified positional parameters for caller
-    func_options_prep_result=$func_run_hooks_result
+    func_propagate_result func_run_hooks func_options_prep
 }


@@ -1845,25 +2007,32 @@ func_parse_options ()
 {
     $debug_cmd

-    func_parse_options_result=
-
+    _G_parse_options_requote=false
     # this just eases exit handling
     while test $# -gt 0; do
       # Defer to hook functions for initial option parsing, so they
       # get priority in the event of reusing an option name.
       func_run_hooks func_parse_options ${1+"$@"}
-
-      # Adjust func_parse_options positional parameters to match
-      eval set dummy "$func_run_hooks_result"; shift
+      func_propagate_result func_run_hooks func_parse_options
+      if $func_propagate_result_result; then
+        eval set dummy "$func_parse_options_result"; shift
+        # Even though we may have changed "$@", we passed the "$@" array
+        # down into the hook and it quoted it for us (because we are in
+        # this if-branch).  No need to quote it again.
+        _G_parse_options_requote=false
+      fi

       # Break out of the loop if we already parsed every option.
       test $# -gt 0 || break

+      # We expect that one of the options parsed in this function matches
+      # and thus we remove _G_opt from "$@" and need to re-quote.
+      _G_match_parse_options=:
       _G_opt=$1
       shift
       case $_G_opt in
         --debug|-x)   debug_cmd='set -x'
-                      func_echo "enabling shell trace mode"
+                      func_echo "enabling shell trace mode" >&2
                       $debug_cmd
                       ;;

@@ -1873,7 +2042,10 @@ func_parse_options ()
                      ;;

         --warnings|--warning|-W)
-                      test $# = 0 && func_missing_arg $_G_opt && break
+                      if test $# = 0 && func_missing_arg $_G_opt; then
+                        _G_parse_options_requote=:
+                        break
+                      fi
                       case " $warning_categories $1" in
                         *" $1 "*)
                           # trailing space prevents matching last $1 above
@@ -1926,15 +2098,24 @@ func_parse_options ()
                       shift
                       ;;

-        --)           break ;;
+        --)           _G_parse_options_requote=: ; break ;;
         -*)           func_fatal_help "unrecognised option: '$_G_opt'" ;;
-        *)            set dummy "$_G_opt" ${1+"$@"}; shift; break ;;
+        *)            set dummy "$_G_opt" ${1+"$@"}; shift
+                      _G_match_parse_options=false
+                      break
+                      ;;
       esac
+
+      if $_G_match_parse_options; then
+        _G_parse_options_requote=:
+      fi
     done

-    # save modified positional parameters for caller
-    func_quote_for_eval ${1+"$@"}
-    func_parse_options_result=$func_quote_for_eval_result
+    if $_G_parse_options_requote; then
+      # save modified positional parameters for caller
+      func_quote eval ${1+"$@"}
+      func_parse_options_result=$func_quote_result
+    fi
 }


@@ -1951,12 +2132,10 @@ func_validate_options ()
     test -n "$opt_warning_types" || opt_warning_types=" $warning_categories"

     func_run_hooks func_validate_options ${1+"$@"}
+    func_propagate_result func_run_hooks func_validate_options

     # Bail if the options were screwed!
     $exit_cmd $EXIT_FAILURE
-
-    # save modified positional parameters for caller
-    func_validate_options_result=$func_run_hooks_result
 }


@@ -2012,8 +2191,8 @@ func_missing_arg ()

 # func_split_equals STRING
 # ------------------------
-# Set func_split_equals_lhs and func_split_equals_rhs shell variables after
-# splitting STRING at the '=' sign.
+# Set func_split_equals_lhs and func_split_equals_rhs shell variables
+# after splitting STRING at the '=' sign.
 test -z "$_G_HAVE_XSI_OPS" \
     && (eval 'x=a/b/c;
       test 5aa/bb/cc = "${#x}${x%%/*}${x%/*}${x#*/}${x##*/}"') 2>/dev/null \
@@ -2028,8 +2207,9 @@ then

       func_split_equals_lhs=${1%%=*}
       func_split_equals_rhs=${1#*=}
-      test "x$func_split_equals_lhs" = "x$1" \
-        && func_split_equals_rhs=
+      if test "x$func_split_equals_lhs" = "x$1"; then
+        func_split_equals_rhs=
+      fi
   }'
 else
   # ...otherwise fall back to using expr, which is often a shell builtin.
@@ -2107,31 +2287,44 @@ func_usage_message ()
 # func_version
 # ------------
 # Echo version message to standard output and exit.
+# The version message is extracted from the calling file's header
+# comments, with leading '# ' stripped:
+#   1. First display the progname and version
+#   2. Followed by the header comment line matching  /^# Written by /
+#   3. Then a blank line followed by the first following line matching
+#      /^# Copyright /
+#   4. Immediately followed by any lines between the previous matches,
+#      except lines preceding the intervening completely blank line.
+# For example, see the header comments of this file.
 func_version ()
 {
     $debug_cmd

     printf '%s\n' "$progname $scriptversion"
     $SED -n '
-        /(C)/!b go
-        :more
-        /\./!{
-          N
-          s|\n# | |
-          b more
+        /^# Written by /!b
+        s|^# ||; p; n
+
+        :fwd2blnk
+        /./ {
+          n
+          b fwd2blnk
         }
-        :go
-        /^# Written by /,/# warranty; / {
-          s|^# ||
-          s|^# *$||
-          s|\((C)\)[ 0-9,-]*[ ,-]\([1-9][0-9]* \)|\1 \2|
-          p
+        p; n
+
+        :holdwrnt
+        s|^# ||
+        s|^# *$||
+        /^Copyright /!{
+          /./H
+          n
+          b holdwrnt
         }
-        /^# Written by / {
-          s|^# ||
-          p
-        }
-        /^warranty; /q' < "$progpath"
+
+        s|\((C)\)[ 0-9,-]*[ ,-]\([1-9][0-9]* \)|\1 \2|
+        G
+        s|\(\n\)\n*|\1|g
+        p; q' < "$progpath"

     exit $?
 }
@@ -2141,7 +2334,7 @@ func_version ()
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp)
-# time-stamp-pattern: "10/scriptversion=%:y-%02m-%02d.%02H; # UTC"
+# time-stamp-pattern: "30/scriptversion=%:y-%02m-%02d.%02H; # UTC"
 # time-stamp-time-zone: "UTC"
 # End:
 #! /bin/sh
@@ -2149,32 +2342,27 @@ func_version ()
 # Extract macro arguments from autotools input with GNU M4.
 # Written by Gary V. Vaughan, 2010
 #
-# Copyright (C) 2010-2014, 2016-2017, 2020 Free Software Foundation,
-# Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.
+
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>

 # Make sure we've evaluated scripts we depend on.
 test -z "$progpath" && . `echo "$0" |${SED-sed} 's|[^/]*$||'`/funclib.sh
 test extract-trace = "$progname" && . `echo "$0" |${SED-sed} 
's|[^/]*$||'`/options-parser

 # Set a version string.
-scriptversion=2014-01-04.01; # UTC
-
-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+scriptversion=2019-02-19.15; # UTC


 ## ------ ##
@@ -2228,47 +2416,6 @@ func_autoconf_configure ()
 }


-# func_find_tool ENVVAR NAMES...
-# ------------------------------
-# Search for a required program.  Use the value of ENVVAR, if set,
-# otherwise find the first of the NAMES that can be run (i.e.,
-# supports --version).  If found, set ENVVAR to the program name,
-# die otherwise.
-func_find_tool ()
-{
-    $debug_cmd
-
-    _G_find_tool_envvar=$1
-    shift
-    _G_find_tool_names=$@
-    eval "_G_find_tool_res=\$$_G_find_tool_envvar"
-    if test -n "$_G_find_tool_res"; then
-      _G_find_tool_error_prefix="\$$find_tool_envvar: "
-    else
-      for _G_prog
-      do
-        if func_tool_version_output $_G_prog >/dev/null; then
-          _G_find_tool_res=$_G_prog
-          break
-        fi
-      done
-    fi
-    if test -n "$_G_find_tool_res"; then
-      func_tool_version_output >/dev/null $_G_find_tool_res "\
-${_G_find_tool_error_prefix}Cannot run '$_G_find_tool_res --version'"
-
-      # Make sure the result is exported to the environment for children
-      # to use.
-      eval "$_G_find_tool_envvar=\$_G_find_tool_res"
-      eval "export $_G_find_tool_envvar"
-    else
-      func_error "\
-One of these is required:
-       $_G_find_tool_names"
-    fi
-}
-
-
 # func_tool_version_output CMD [FATAL-ERROR-MSG]
 # ----------------------------------------------
 # Attempt to run 'CMD --version', discarding errors.  The output can be
@@ -2303,6 +2450,105 @@ func_tool_version_output ()
 }


+# func_tool_version_number CMD [FATAL-ERROR-MSG]
+# ----------------------------------------------
+# Pass arguments to func_tool_version_output, but set
+# $func_tool_version_number_result to the last dot delimited digit string
+# on the first line of output.
+func_tool_version_number ()
+{
+    $debug_cmd
+
+    _G_verout=`func_tool_version_output "$@"`
+    _G_status=$?
+
+    # A version number starts with a digit following a space on the first
+    # line of output from `--version`.
+    _G_verout=`echo "$_G_verout" |sed 1q`
+    if test -n "$_G_verout"; then
+      _G_vernum=`expr "$_G_verout" : '.* \([0-9][^ ]*\)'`
+    fi
+
+    if test -n "$_G_vernum"; then
+      printf '%s\n' "$_G_vernum"
+    else
+      printf '%s\n' "$_G_verout"
+    fi
+
+    (exit $_G_status)
+}
+
+
+# func_find_tool ENVVAR NAMES...
+# ------------------------------
+# Search for a required program.  Use the value of ENVVAR, if set,
+# otherwise find the first of the NAMES that can be run (i.e.,
+# supports --version).  If found, set ENVVAR to the program name,
+# die otherwise.
+func_find_tool ()
+{
+    $debug_cmd
+
+    _G_find_tool_envvar=$1
+    shift
+    _G_find_tool_names=$@
+    eval "_G_find_tool_res=\$$_G_find_tool_envvar"
+    if test -n "$_G_find_tool_res"; then
+      _G_find_tool_error_prefix="\$$find_tool_envvar: "
+    else
+      _G_find_tool_res=
+      _G_bestver=
+      for _G_prog
+      do
+        _G_find_tool_save_IFS=$IFS
+        IFS=${PATH_SEPARATOR-:}
+       for _G_dir in $PATH; do
+         IFS=$_G_find_tool_save_IFS
+         _G_progpath=$_G_dir/$_G_prog
+          test -r "$_G_progpath" && {
+            _G_curver=`func_tool_version_number $_G_progpath`
+           case $_G_bestver,$_G_curver in
+           ,)
+             # first non--version responsive prog sticks!
+              test -n "$_G_progpath" || _G_find_tool_res=$_G_progpath
+              ;;
+            ,*)
+             # first --version responsive prog beats non--version responsive!
+             _G_find_tool_res=$_G_progpath
+             _G_bestver=$_G_curver
+             ;;
+           *,*)
+             # another --version responsive prog must be newer to beat 
previous one!
+             test "x$_G_curver" = "x$_G_bestver" \
+               || func_lt_ver "$_G_curver" "$_G_bestver" \
+               || {
+                    _G_find_tool_res=$_G_progpath
+                    _G_bestver=$_G_curver
+                  }
+             ;;
+           esac
+          }
+       done
+       IFS=$_G_find_tool_save_IFS
+      done
+    fi
+    if test -n "$_G_find_tool_res"; then
+      func_tool_version_number >/dev/null $_G_find_tool_res "\
+${_G_find_tool_error_prefix}Cannot run '$_G_find_tool_res --version'"
+
+      # Make sure the result is exported to the environment for children
+      # to use.
+      eval "$_G_find_tool_envvar=\$_G_find_tool_res"
+      eval "export $_G_find_tool_envvar"
+    else
+      func_error "\
+One of these is required:
+       $_G_find_tool_names"
+    fi
+}
+
+
+
 ## -------------------- ##
 ## Resource management. ##
 ## -------------------- ##
@@ -2418,29 +2664,41 @@ func_extract_trace ()
     # arguments to Autocof functions, but without following
     # 'm4_s?include' files.
     _G_mini='
-        # Initialisation.
+        dnl  Initialisation.
         m4_changequote([,])
         m4_define([m4_copy],   [m4_define([$2], m4_defn([$1]))])
         m4_define([m4_rename], [m4_copy([$1], [$2])m4_undefine([$1])])

-        # Disable these macros.
-        m4_undefine([m4_dnl])
-        m4_undefine([m4_include])
-        m4_undefine([m4_m4exit])
-        m4_undefine([m4_m4wrap])
-        m4_undefine([m4_maketemp])
-
-        # Copy and rename macros not handled by "m4 --prefix".
+        dnl  Replace macros which may abort m4 with a no-op variant.
+        m4_pushdef([m4_assert])
+        m4_pushdef([m4_exit])
+        m4_pushdef([m4_fatal])
+        m4_pushdef([m4_m4exit])
+
+        dnl  Replace macros that might break stderr of m4.
+        m4_pushdef([m4_errprint])
+        m4_pushdef([m4_errprintn])
+        m4_pushdef([m4_include])
+        m4_pushdef([m4_warn])
+
+        dnl  Avoid side-effects of tracing by extract-trace.
+        m4_pushdef([m4_maketemp])
+        m4_pushdef([m4_mkstemp])
+
+        dnl  TODO: reasons for this
+        m4_pushdef([m4_dnl])
+        m4_pushdef([m4_m4wrap])
+
+        dnl  Copy and rename macros not handled by "m4 --prefix".
         m4_define([dnl],         [m4_builtin([dnl])])
         m4_copy([m4_define],     [m4_defun])
         m4_rename([m4_ifelse],   [m4_if])
-        m4_ifdef([m4_mkstemp],   [m4_undefine([m4_mkstemp])])
         m4_rename([m4_patsubst], [m4_bpatsubst])
         m4_rename([m4_regexp],   [m4_bregexp])

-        # "m4sugar.mini" - useful m4-time macros for dynamic arguments.
-        # If we discover packages that need more m4 macros defined in
-        # order to bootstrap correctly, add them here:
+        dnl  "m4sugar.mini" - useful m4-time macros for dynamic arguments.
+        dnl  If we discover packages that need more m4 macros defined in
+        dnl  order to bootstrap correctly, add them here:
         m4_define([m4_bmatch],
             [m4_if([$#], 0, [], [$#], 1, [], [$#], 2, [$2],
                    [m4_if(m4_bregexp([$1], [$2]), -1,
@@ -2451,11 +2709,11 @@ func_extract_trace ()
         m4_define([m4_require], [$1])
         m4_define([m4_shift3], [m4_shift(m4shift(m4shift($@)))])

-        # "autoconf.mini" - things from autoconf macros we care about.
+        dnl  "autoconf.mini" - things from autoconf macros we care about.
         m4_copy([m4_defun], [AC_DEFUN])

-        # Dummy definitions for the macros we want to trace.
-        # AM_INIT_AUTOMAKE at least produces no trace without this.
+        dnl  Dummy definitions for the macros we want to trace.
+        dnl  AM_INIT_AUTOMAKE at least produces no trace without this.
     '

     _G_save=$IFS
@@ -2562,12 +2820,12 @@ test extract-trace = "$progname" && func_main "$@"
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp)
-# time-stamp-pattern: "20/scriptversion=%:y-%02m-%02d.%02H; # UTC"
+# time-stamp-pattern: "50/scriptversion=%:y-%02m-%02d.%02H; # UTC"
 # time-stamp-time-zone: "UTC"
 # End:

 # Set a version string for *this* script.
-scriptversion=2014-11-04.13; # UTC
+scriptversion=2019-03-22.11; # UTC


 ## ------------------- ##
@@ -2595,8 +2853,8 @@ func_bootstrap ()

     # Save the current positional parameters to prevent them being
     # corrupted by calls to 'set' in 'func_init'.
-    func_quote_for_eval ${1+"$@"}
-    _G_saved_positional_parameters=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    _G_saved_positional_parameters=$func_quote_result

     # Initialisation.
     func_init
@@ -2693,10 +2951,13 @@ func_reconfigure ()

     $require_automake_options

-    # Automake (without 'foreign' option) requires that README exists.
+    # Automake (without 'foreign' option) requires that NEWS & README exist.
     case " $automake_options " in
       " foreign ") ;;
-      *) func_ensure_README ;;
+      *)
+        func_ensure_NEWS
+        func_ensure_README
+        ;;
     esac

     # Ensure ChangeLog presence.
@@ -2753,6 +3014,8 @@ func_gnulib_tool ()
     $require_libtoolize

     test true = "$gnulib_tool" || {
+      $require_gnulib_git_submodules
+
       # bootstrap.conf written for gnulib bootstrap expects
       # gnulib_tool_option_extras to which --no-changelog is appended,
       # but libtool bootstrap expects you to append to gnulib_tool_options
@@ -2874,6 +3137,7 @@ func_gettext_configuration ()
              '"$_G_xgettext_options"' \\\
              $${end_of_xgettext_options+}
         }
+        s/ *$//
       ' po/Makevars.template >po/Makevars || exit 1
     }

@@ -2928,7 +3192,7 @@ func_libtoolize ()
 # -----------------------------------
 # Copy SRC, a path relative to the gnulib sub-tree, to DEST, a path
 # relative to the top-level source directory using gnulib-tool so that
-# any patches or replacements in $local_gl_dir are applied.
+# any patches or replacements in $local_gl_path are applied.
 func_gnulib_tool_copy_file ()
 {
     $debug_cmd
@@ -3025,6 +3289,29 @@ EOT
 }


+# func_ensure_NEWS
+# ----------------
+# Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
+# completion with no NEWS file, even though NEWS.md or NEWS.txt
+# is often preferable.
+func_ensure_NEWS ()
+{
+    $debug_cmd
+
+    test -f NEWS || {
+      _G_NEWS=
+      for _G_news in NEWS.txt NEWS.md NEWS.rst; do
+        test -f "$_G_news" && break
+      done
+
+      test -f "$_G_news" && $LN_S $_G_news NEWS
+      func_verbose "$LN_S $_G_news NEWS"
+    }
+
+    return 0
+}
+
+
 # func_ensure_README
 # ------------------
 # Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
@@ -3230,6 +3517,26 @@ func_update_dotversion ()
 # most, once.


+# require_gnulib_git_submodules
+# -----------------------------
+# Initialize all git modules from $gnulib_git_submodules before we
+# run 'gnulib-tool'.
+require_gnulib_git_submodules=func_require_gnulib_git_submodules
+func_require_gnulib_git_submodules ()
+{
+    test -n "$gnulib_git_submodules" && {
+      for _G_submodule in $gnulib_git_submodules
+      do
+        func_show_eval "git submodule init -- $_G_submodule" \
+            && func_show_eval "git submodule update -- $_G_submodule" \
+            || func_fatal_error "Unable to init git module '$_G_submodule'."
+      done
+    }
+
+    require_gnulib_git_submodules=:
+}
+
+
 # require_checkout_only_file
 # --------------------------
 # Bail out  if this package only bootstraps properly from a repository
@@ -3533,13 +3840,13 @@ func_require_buildreq_automake ()
 # require_buildreq_patch
 # ----------------------
 # Automatically add a patch build-requirement if there are diff files
-# in $local_gl_dir.
+# in $local_gl_path.
 require_buildreq_patch=func_require_buildreq_patch
 func_require_buildreq_patch ()
 {
     $debug_cmd

-    $require_local_gl_dir
+    $require_local_gl_path

     # This ensures PATCH is set appropriately by the time
     # func_check_versions enforces $buildreq.
@@ -3547,14 +3854,19 @@ func_require_buildreq_patch ()

     # If patch is not already listed in $buildreq...
     printf '%s\n' "$buildreq" |func_grep_q '^[  ]*patch' || {
-      # The ugly find invocation is necessary to exit with non-zero
-      # status for old find binaries that don't support -exec fully.
-      if test ! -d "$local_gl_dir" \
-          || find "$local_gl_dir" -name "*.diff" -exec false {} \; ; then :
-      else
-          func_append buildreq 'patch - http://www.gnu.org/s/patch
-'
-      fi
+      eval "set dummy $local_gl_path_quoted" ; shift
+
+      for _G_dir
+      do
+        # The ugly find invocation is necessary to exit with non-zero
+        # status for old find binaries that don't support -exec fully.
+        if test ! -d "$_G_dir" \
+            || find "$_G_dir" -name "*.diff" -exec false {} \; ; then :
+        else
+          func_append buildreq "patch - http://www.gnu.org/s/patch$nl";
+          break
+        fi
+      done
     }

     require_buildreq_patch=:
@@ -3908,8 +4220,9 @@ func_require_gnulib_submodule ()
         trap func_cleanup_gnulib 1 2 13 15

         shallow=
-        $GIT clone -h 2>&1 |func_grep_q -- --depth \
-            && shallow='--depth 365'
+        test -n "$gnulib_clone_since" && \
+            $GIT clone -h 2>&1 |func_grep_q -- --shallow-since \
+            && shallow="--shallow-since=$gnulib_clone_since"

         func_show_eval "$GIT clone $shallow '$gnulib_url' '$gnulib_path'" \
           func_cleanup_gnulib
@@ -3988,9 +4301,14 @@ func_require_gnulib_tool_base_options ()
       $require_gnulib_name
       test -n "$gnulib_name" \
           && func_append_uniq gnulib_tool_base_options " --lib=$gnulib_name"
-      $require_local_gl_dir
-      test -n "$local_gl_dir" \
-          && func_append_uniq gnulib_tool_base_options " 
--local-dir=$local_gl_dir"
+      $require_local_gl_path
+      test -n "$local_gl_path" && {
+        eval "set dummy $local_gl_path_quoted" ; shift
+        for _G_dir
+        do
+          func_append_uniq gnulib_tool_base_options " --local-dir=$_G_dir"
+        done
+      }
       $require_source_base
       test -n "$source_base" \
           && func_append_uniq gnulib_tool_base_options " 
--source-base=$source_base"
@@ -4037,25 +4355,49 @@ Please install GNU Libtool, or 'export 
LIBTOOLIZE=/path/to/libtoolize'."
 }


-# require_local_gl_dir
-# --------------------
-# Ensure local_gl_dir has a sensible value, extracted from 'gnulib-cache.m4'
-# if possible, otherwise letting 'gnulib-tool' pick a default.
-require_local_gl_dir=func_require_local_gl_dir
-func_require_local_gl_dir ()
+# require_local_gl_path
+# ---------------------
+# Ensure local_gl_path has a sensible value, extracted from 'gnulib-cache.m4' 
if
+# possible, otherwise letting 'gnulib-tool' pick a default.
+require_local_gl_path=func_require_local_gl_path
+func_require_local_gl_path ()
 {
     $debug_cmd

     $require_gnulib_cache

-    test -f "$gnulib_cache" && test -z "$local_gl_dir" && {
+    # Compat with older bootstrap versions.
+    test -n "$local_gl_dir" && {
+      func_warning settings "\
+Please use 'local_gl_path' instead of 'local_gl_dir' in your
+'bootstrap.conf' file."
+      local_gl_path=$local_gl_dir
+      local_gl_dir=
+    }
+
+    test -f "$gnulib_cache" && test -z "$local_gl_path" && {
       func_extract_trace_first "gl_LOCAL_DIR" "$gnulib_cache"
-      local_gl_dir=$func_extract_trace_first_result
+      local_gl_path=$func_extract_trace_first_result
+      test -n "$local_gl_path" && func_verbose "local_gl_path='$local_gl_path'"
+    }

-      test -n "$local_gl_dir" && func_verbose "local_gl_dir='$local_gl_dir'"
+    test -z "$local_gl_path_quoted" && test -n "$local_gl_path" && {
+      save_IFS=$IFS
+      set dummy
+      # Don't use PATH_SEPARATOR here, gnulib must be fixed to store only ':' 
as
+      # path separator into gnulib-cache.m4 (consistency reasons among 
systems).
+      IFS=:
+      for _G_dir in $local_gl_path
+      do
+        set "$@" "$_G_dir"
+      done
+      shift
+      IFS=$save_IFS
+      func_quote eval "$@"
+      local_gl_path_quoted=$func_quote_result
     }

-    require_local_gl_dir=:
+    require_local_gl_path=:
 }


@@ -4354,21 +4696,6 @@ else
 fi


-# func_unset VAR
-# --------------
-# Portably unset VAR.
-# In some shells, an 'unset VAR' statement leaves a non-zero return
-# status if VAR is already unset, which might be problematic if the
-# statement is used at the end of a function (thus poisoning its return
-# value) or when 'set -e' is active (causing even a spurious abort of
-# the script in this case).
-func_unset ()
-{
-    { eval $1=; unset $1; }
-}
-unset=func_unset
-
-
 # func_cmp_s FILE1 FILE2
 # ----------------------
 # Return non-zero exit status unless FILE1 and FILE2 are identical, without
@@ -4609,8 +4936,8 @@ func_show_eval ()
     _G_fail_exp=${2-':'}

     ${opt_silent-'false'} || {
-      func_quote_for_eval $_G_cmd
-      eval func_truncate_cmd $func_quote_for_eval_result
+      func_quote eval $_G_cmd
+      eval func_truncate_cmd $func_quote_result
       func_echo "running: $tc_bold$func_truncate_cmd_result$tc_reset"
     }

@@ -4997,8 +5324,8 @@ bootstrap_options_prep ()
     opt_skip_po=false

     # Pass back the list of options we consumed.
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_options_prep_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_options_prep_result=$func_quote_result
 }
 func_add_hook func_options_prep bootstrap_options_prep

@@ -5048,8 +5375,8 @@ bootstrap_parse_options ()
     done

     # save modified positional parameters for caller
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_parse_options_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_parse_options_result=$func_quote_result
 }
 func_add_hook func_parse_options bootstrap_parse_options

@@ -5067,8 +5394,8 @@ bootstrap_validate_options ()
         && func_fatal_help "too many arguments"

     # Pass back the (empty) list of unconsumed options.
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_validate_options_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_validate_options_result=$func_quote_result
 }
 func_add_hook func_validate_options bootstrap_validate_options

diff --git a/bootstrap.conf b/bootstrap.conf
index beb6bf72..9af171cb 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -1,4 +1,4 @@
-# bootstrap.conf (GNU M4) version 2021-04-01
+# bootstrap.conf (GNU M4) version 2021-05-07
 # Written by Gary V. Vaughan, 2010

 # Copyright (C) 2010, 2014, 2016-2017, 2020-2021 Free Software
@@ -83,15 +83,6 @@ m4_install_texinfo_diff_driver ()
 }
 func_add_hook func_prep m4_install_texinfo_diff_driver

-# m4_bootstrap_options_prep
-# -------------------------
-# Skip po import until we integrate translation.
-m4_bootstrap_options_prep ()
-{
-    opt_skip_po=:
-}
-func_add_hook func_options_prep m4_bootstrap_options_prep
-

 # Local variables:
 # mode: shell-script
diff --git a/gl/build-aux/bootstrap.in b/gl/build-aux/bootstrap.in
index f42d0e4f..d0ac0670 100755
--- a/gl/build-aux/bootstrap.in
+++ b/gl/build-aux/bootstrap.in
@@ -2,34 +2,27 @@

 # Bootstrap an Autotooled package from checked-out sources.
 # Written by Gary V. Vaughan, 2010
+# Inspired by a script written by Paul Eggert.

-# Copyright (C) 2010-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.

-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# You should place a copy of this script under version control in the
+# top-level directory of your project.  The intent is that all
+# customization can be done with a `bootstrap.conf` file also maintained
+# in your version control.

-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Originally written by Paul Eggert.  The canonical version of this
-# script is maintained as build-aux/bootstrap in gnulib, however, to
-# be useful to your project, you should place a copy of it under
-# version control in the top-level directory of your project.  The
-# intent is that all customization can be done with a bootstrap.conf
-# file also maintained in your version control; gnulib comes with a
-# template build-aux/bootstrap.conf to get you started.
-
-# Please report bugs or propose patches to bug-gnulib@gnu.org.
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>


 ## ------ ##
@@ -137,7 +130,7 @@ package_bugreport=
 doc_base=
 gnulib_mk=
 gnulib_name=
-local_gl_dir=
+local_gl_path=
 source_base=
 tests_base=

@@ -165,6 +158,9 @@ gnulib_non_module_files="
 gnulib_path=
 gnulib_url=

+# Date from which to clone github, to avoid a full clone.
+gnulib_clone_since=
+
 # Additional gnulib-tool options to use.
 gnulib_tool_options="
         --no-changelog
@@ -233,7 +229,7 @@ vc_ignore=
 . `echo "$0" |${SED-sed} 's|[^/]*$||'`"extract-trace"

 # Set a version string for *this* script.
-scriptversion=2014-11-04.13; # UTC
+scriptversion=2019-03-22.11; # UTC


 ## ------------------- ##
@@ -261,8 +257,8 @@ func_bootstrap ()

     # Save the current positional parameters to prevent them being
     # corrupted by calls to 'set' in 'func_init'.
-    func_quote_for_eval ${1+"$@"}
-    _G_saved_positional_parameters=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    _G_saved_positional_parameters=$func_quote_result

     # Initialisation.
     func_init
@@ -359,10 +355,13 @@ func_reconfigure ()

     $require_automake_options

-    # Automake (without 'foreign' option) requires that README exists.
+    # Automake (without 'foreign' option) requires that NEWS & README exist.
     case " $automake_options " in
       " foreign ") ;;
-      *) func_ensure_README ;;
+      *)
+        func_ensure_NEWS
+        func_ensure_README
+        ;;
     esac

     # Ensure ChangeLog presence.
@@ -419,6 +418,8 @@ func_gnulib_tool ()
     $require_libtoolize

     test true = "$gnulib_tool" || {
+      $require_gnulib_git_submodules
+
       # bootstrap.conf written for gnulib bootstrap expects
       # gnulib_tool_option_extras to which --no-changelog is appended,
       # but libtool bootstrap expects you to append to gnulib_tool_options
@@ -540,6 +541,7 @@ func_gettext_configuration ()
              '"$_G_xgettext_options"' \\\
              $${end_of_xgettext_options+}
         }
+        s/ *$//
       ' po/Makevars.template >po/Makevars || exit 1
     }

@@ -594,7 +596,7 @@ func_libtoolize ()
 # -----------------------------------
 # Copy SRC, a path relative to the gnulib sub-tree, to DEST, a path
 # relative to the top-level source directory using gnulib-tool so that
-# any patches or replacements in $local_gl_dir are applied.
+# any patches or replacements in $local_gl_path are applied.
 func_gnulib_tool_copy_file ()
 {
     $debug_cmd
@@ -691,6 +693,29 @@ EOT
 }


+# func_ensure_NEWS
+# ----------------
+# Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
+# completion with no NEWS file, even though NEWS.md or NEWS.txt
+# is often preferable.
+func_ensure_NEWS ()
+{
+    $debug_cmd
+
+    test -f NEWS || {
+      _G_NEWS=
+      for _G_news in NEWS.txt NEWS.md NEWS.rst; do
+        test -f "$_G_news" && break
+      done
+
+      test -f "$_G_news" && $LN_S $_G_news NEWS
+      func_verbose "$LN_S $_G_news NEWS"
+    }
+
+    return 0
+}
+
+
 # func_ensure_README
 # ------------------
 # Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
@@ -896,6 +921,26 @@ func_update_dotversion ()
 # most, once.


+# require_gnulib_git_submodules
+# -----------------------------
+# Initialize all git modules from $gnulib_git_submodules before we
+# run 'gnulib-tool'.
+require_gnulib_git_submodules=func_require_gnulib_git_submodules
+func_require_gnulib_git_submodules ()
+{
+    test -n "$gnulib_git_submodules" && {
+      for _G_submodule in $gnulib_git_submodules
+      do
+        func_show_eval "git submodule init -- $_G_submodule" \
+            && func_show_eval "git submodule update -- $_G_submodule" \
+            || func_fatal_error "Unable to init git module '$_G_submodule'."
+      done
+    }
+
+    require_gnulib_git_submodules=:
+}
+
+
 # require_checkout_only_file
 # --------------------------
 # Bail out  if this package only bootstraps properly from a repository
@@ -1199,13 +1244,13 @@ func_require_buildreq_automake ()
 # require_buildreq_patch
 # ----------------------
 # Automatically add a patch build-requirement if there are diff files
-# in $local_gl_dir.
+# in $local_gl_path.
 require_buildreq_patch=func_require_buildreq_patch
 func_require_buildreq_patch ()
 {
     $debug_cmd

-    $require_local_gl_dir
+    $require_local_gl_path

     # This ensures PATCH is set appropriately by the time
     # func_check_versions enforces $buildreq.
@@ -1213,14 +1258,19 @@ func_require_buildreq_patch ()

     # If patch is not already listed in $buildreq...
     printf '%s\n' "$buildreq" |func_grep_q '^[  ]*patch' || {
-      # The ugly find invocation is necessary to exit with non-zero
-      # status for old find binaries that don't support -exec fully.
-      if test ! -d "$local_gl_dir" \
-          || find "$local_gl_dir" -name "*.diff" -exec false {} \; ; then :
-      else
-          func_append buildreq 'patch - http://www.gnu.org/s/patch
-'
-      fi
+      eval "set dummy $local_gl_path_quoted" ; shift
+
+      for _G_dir
+      do
+        # The ugly find invocation is necessary to exit with non-zero
+        # status for old find binaries that don't support -exec fully.
+        if test ! -d "$_G_dir" \
+            || find "$_G_dir" -name "*.diff" -exec false {} \; ; then :
+        else
+          func_append buildreq "patch - http://www.gnu.org/s/patch$nl";
+          break
+        fi
+      done
     }

     require_buildreq_patch=:
@@ -1574,8 +1624,9 @@ func_require_gnulib_submodule ()
         trap func_cleanup_gnulib 1 2 13 15

         shallow=
-        $GIT clone -h 2>&1 |func_grep_q -- --depth \
-            && shallow='--depth 365'
+        test -n "$gnulib_clone_since" && \
+            $GIT clone -h 2>&1 |func_grep_q -- --shallow-since \
+            && shallow="--shallow-since=$gnulib_clone_since"

         func_show_eval "$GIT clone $shallow '$gnulib_url' '$gnulib_path'" \
           func_cleanup_gnulib
@@ -1654,9 +1705,14 @@ func_require_gnulib_tool_base_options ()
       $require_gnulib_name
       test -n "$gnulib_name" \
           && func_append_uniq gnulib_tool_base_options " --lib=$gnulib_name"
-      $require_local_gl_dir
-      test -n "$local_gl_dir" \
-          && func_append_uniq gnulib_tool_base_options " 
--local-dir=$local_gl_dir"
+      $require_local_gl_path
+      test -n "$local_gl_path" && {
+        eval "set dummy $local_gl_path_quoted" ; shift
+        for _G_dir
+        do
+          func_append_uniq gnulib_tool_base_options " --local-dir=$_G_dir"
+        done
+      }
       $require_source_base
       test -n "$source_base" \
           && func_append_uniq gnulib_tool_base_options " 
--source-base=$source_base"
@@ -1703,25 +1759,49 @@ Please install GNU Libtool, or 'export 
LIBTOOLIZE=/path/to/libtoolize'."
 }


-# require_local_gl_dir
-# --------------------
-# Ensure local_gl_dir has a sensible value, extracted from 'gnulib-cache.m4'
-# if possible, otherwise letting 'gnulib-tool' pick a default.
-require_local_gl_dir=func_require_local_gl_dir
-func_require_local_gl_dir ()
+# require_local_gl_path
+# ---------------------
+# Ensure local_gl_path has a sensible value, extracted from 'gnulib-cache.m4' 
if
+# possible, otherwise letting 'gnulib-tool' pick a default.
+require_local_gl_path=func_require_local_gl_path
+func_require_local_gl_path ()
 {
     $debug_cmd

     $require_gnulib_cache

-    test -f "$gnulib_cache" && test -z "$local_gl_dir" && {
+    # Compat with older bootstrap versions.
+    test -n "$local_gl_dir" && {
+      func_warning settings "\
+Please use 'local_gl_path' instead of 'local_gl_dir' in your
+'bootstrap.conf' file."
+      local_gl_path=$local_gl_dir
+      local_gl_dir=
+    }
+
+    test -f "$gnulib_cache" && test -z "$local_gl_path" && {
       func_extract_trace_first "gl_LOCAL_DIR" "$gnulib_cache"
-      local_gl_dir=$func_extract_trace_first_result
+      local_gl_path=$func_extract_trace_first_result
+      test -n "$local_gl_path" && func_verbose "local_gl_path='$local_gl_path'"
+    }

-      test -n "$local_gl_dir" && func_verbose "local_gl_dir='$local_gl_dir'"
+    test -z "$local_gl_path_quoted" && test -n "$local_gl_path" && {
+      save_IFS=$IFS
+      set dummy
+      # Don't use PATH_SEPARATOR here, gnulib must be fixed to store only ':' 
as
+      # path separator into gnulib-cache.m4 (consistency reasons among 
systems).
+      IFS=:
+      for _G_dir in $local_gl_path
+      do
+        set "$@" "$_G_dir"
+      done
+      shift
+      IFS=$save_IFS
+      func_quote eval "$@"
+      local_gl_path_quoted=$func_quote_result
     }

-    require_local_gl_dir=:
+    require_local_gl_path=:
 }


@@ -2020,21 +2100,6 @@ else
 fi


-# func_unset VAR
-# --------------
-# Portably unset VAR.
-# In some shells, an 'unset VAR' statement leaves a non-zero return
-# status if VAR is already unset, which might be problematic if the
-# statement is used at the end of a function (thus poisoning its return
-# value) or when 'set -e' is active (causing even a spurious abort of
-# the script in this case).
-func_unset ()
-{
-    { eval $1=; unset $1; }
-}
-unset=func_unset
-
-
 # func_cmp_s FILE1 FILE2
 # ----------------------
 # Return non-zero exit status unless FILE1 and FILE2 are identical, without
@@ -2275,8 +2340,8 @@ func_show_eval ()
     _G_fail_exp=${2-':'}

     ${opt_silent-'false'} || {
-      func_quote_for_eval $_G_cmd
-      eval func_truncate_cmd $func_quote_for_eval_result
+      func_quote eval $_G_cmd
+      eval func_truncate_cmd $func_quote_result
       func_echo "running: $tc_bold$func_truncate_cmd_result$tc_reset"
     }

@@ -2663,8 +2728,8 @@ bootstrap_options_prep ()
     opt_skip_po=false

     # Pass back the list of options we consumed.
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_options_prep_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_options_prep_result=$func_quote_result
 }
 func_add_hook func_options_prep bootstrap_options_prep

@@ -2714,8 +2779,8 @@ bootstrap_parse_options ()
     done

     # save modified positional parameters for caller
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_parse_options_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_parse_options_result=$func_quote_result
 }
 func_add_hook func_parse_options bootstrap_parse_options

@@ -2733,8 +2798,8 @@ bootstrap_validate_options ()
         && func_fatal_help "too many arguments"

     # Pass back the (empty) list of unconsumed options.
-    func_quote_for_eval ${1+"$@"}
-    bootstrap_validate_options_result=$func_quote_for_eval_result
+    func_quote eval ${1+"$@"}
+    bootstrap_validate_options_result=$func_quote_result
 }
 func_add_hook func_validate_options bootstrap_validate_options

diff --git a/gl/build-aux/extract-trace b/gl/build-aux/extract-trace
index a6490162..ac76dbbb 100755
--- a/gl/build-aux/extract-trace
+++ b/gl/build-aux/extract-trace
@@ -3,32 +3,27 @@
 # Extract macro arguments from autotools input with GNU M4.
 # Written by Gary V. Vaughan, 2010
 #
-# Copyright (C) 2010-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.
+
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>

 # Make sure we've evaluated scripts we depend on.
 test -z "$progpath" && . `echo "$0" |${SED-sed} 's|[^/]*$||'`/funclib.sh
 test extract-trace = "$progname" && . `echo "$0" |${SED-sed} 
's|[^/]*$||'`/options-parser

 # Set a version string.
-scriptversion=2014-01-04.01; # UTC
-
-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+scriptversion=2019-02-19.15; # UTC


 ## ------ ##
@@ -82,6 +77,69 @@ func_autoconf_configure ()
 }


+# func_tool_version_output CMD [FATAL-ERROR-MSG]
+# ----------------------------------------------
+# Attempt to run 'CMD --version', discarding errors.  The output can be
+# ignored by redirecting stdout, and this function used simply to test
+# whether the command exists and exits normally when passed a
+# '--version' argument.
+# When FATAL-ERROR-MSG is given, then this function will display the
+# message and exit if running 'CMD --version' returns a non-zero exit
+# status.
+func_tool_version_output ()
+{
+    $debug_cmd
+
+    _G_cmd=$1
+    _G_fatal_error_msg=$2
+
+    # Some tools, like 'git2cl' produce thousands of lines of output
+    # unless stdin is /dev/null - in that case we want to return
+    # successfully without saving all of that output.  Other tools,
+    # such as 'help2man' exit with a non-zero status when stdin comes
+    # from /dev/null, so we re-execute without /dev/null if that
+    # happens.  This means that occasionally, the output from both calls
+    # ends up in the result, but the alternative would be to discard the
+    # output from one call, and hope the other produces something useful.
+    { $_G_cmd --version </dev/null || $_G_cmd --version; } 2>/dev/null
+    _G_status=$?
+
+    test 0 -ne "$_G_status" && test -n "$_G_fatal_error_msg" \
+        && func_fatal_error "$_G_fatal_error_msg"
+
+    (exit $_G_status)
+}
+
+
+# func_tool_version_number CMD [FATAL-ERROR-MSG]
+# ----------------------------------------------
+# Pass arguments to func_tool_version_output, but set
+# $func_tool_version_number_result to the last dot delimited digit string
+# on the first line of output.
+func_tool_version_number ()
+{
+    $debug_cmd
+
+    _G_verout=`func_tool_version_output "$@"`
+    _G_status=$?
+
+    # A version number starts with a digit following a space on the first
+    # line of output from `--version`.
+    _G_verout=`echo "$_G_verout" |sed 1q`
+    if test -n "$_G_verout"; then
+      _G_vernum=`expr "$_G_verout" : '.* \([0-9][^ ]*\)'`
+    fi
+
+    if test -n "$_G_vernum"; then
+      printf '%s\n' "$_G_vernum"
+    else
+      printf '%s\n' "$_G_verout"
+    fi
+
+    (exit $_G_status)
+}
+
+
 # func_find_tool ENVVAR NAMES...
 # ------------------------------
 # Search for a required program.  Use the value of ENVVAR, if set,
@@ -99,16 +157,44 @@ func_find_tool ()
     if test -n "$_G_find_tool_res"; then
       _G_find_tool_error_prefix="\$$find_tool_envvar: "
     else
+      _G_find_tool_res=
+      _G_bestver=
       for _G_prog
       do
-        if func_tool_version_output $_G_prog >/dev/null; then
-          _G_find_tool_res=$_G_prog
-          break
-        fi
+        _G_find_tool_save_IFS=$IFS
+        IFS=${PATH_SEPARATOR-:}
+       for _G_dir in $PATH; do
+         IFS=$_G_find_tool_save_IFS
+         _G_progpath=$_G_dir/$_G_prog
+          test -r "$_G_progpath" && {
+            _G_curver=`func_tool_version_number $_G_progpath`
+           case $_G_bestver,$_G_curver in
+           ,)
+             # first non--version responsive prog sticks!
+              test -n "$_G_progpath" || _G_find_tool_res=$_G_progpath
+              ;;
+            ,*)
+             # first --version responsive prog beats non--version responsive!
+             _G_find_tool_res=$_G_progpath
+             _G_bestver=$_G_curver
+             ;;
+           *,*)
+             # another --version responsive prog must be newer to beat 
previous one!
+             test "x$_G_curver" = "x$_G_bestver" \
+               || func_lt_ver "$_G_curver" "$_G_bestver" \
+               || {
+                    _G_find_tool_res=$_G_progpath
+                    _G_bestver=$_G_curver
+                  }
+             ;;
+           esac
+          }
+       done
+       IFS=$_G_find_tool_save_IFS
       done
     fi
     if test -n "$_G_find_tool_res"; then
-      func_tool_version_output >/dev/null $_G_find_tool_res "\
+      func_tool_version_number >/dev/null $_G_find_tool_res "\
 ${_G_find_tool_error_prefix}Cannot run '$_G_find_tool_res --version'"

       # Make sure the result is exported to the environment for children
@@ -123,39 +209,6 @@ One of these is required:
 }


-# func_tool_version_output CMD [FATAL-ERROR-MSG]
-# ----------------------------------------------
-# Attempt to run 'CMD --version', discarding errors.  The output can be
-# ignored by redirecting stdout, and this function used simply to test
-# whether the command exists and exits normally when passed a
-# '--version' argument.
-# When FATAL-ERROR-MSG is given, then this function will display the
-# message and exit if running 'CMD --version' returns a non-zero exit
-# status.
-func_tool_version_output ()
-{
-    $debug_cmd
-
-    _G_cmd=$1
-    _G_fatal_error_msg=$2
-
-    # Some tools, like 'git2cl' produce thousands of lines of output
-    # unless stdin is /dev/null - in that case we want to return
-    # successfully without saving all of that output.  Other tools,
-    # such as 'help2man' exit with a non-zero status when stdin comes
-    # from /dev/null, so we re-execute without /dev/null if that
-    # happens.  This means that occasionally, the output from both calls
-    # ends up in the result, but the alternative would be to discard the
-    # output from one call, and hope the other produces something useful.
-    { $_G_cmd --version </dev/null || $_G_cmd --version; } 2>/dev/null
-    _G_status=$?
-
-    test 0 -ne "$_G_status" && test -n "$_G_fatal_error_msg" \
-        && func_fatal_error "$_G_fatal_error_msg"
-
-    (exit $_G_status)
-}
-

 ## -------------------- ##
 ## Resource management. ##
@@ -272,29 +325,41 @@ func_extract_trace ()
     # arguments to Autocof functions, but without following
     # 'm4_s?include' files.
     _G_mini='
-        # Initialisation.
+        dnl  Initialisation.
         m4_changequote([,])
         m4_define([m4_copy],   [m4_define([$2], m4_defn([$1]))])
         m4_define([m4_rename], [m4_copy([$1], [$2])m4_undefine([$1])])

-        # Disable these macros.
-        m4_undefine([m4_dnl])
-        m4_undefine([m4_include])
-        m4_undefine([m4_m4exit])
-        m4_undefine([m4_m4wrap])
-        m4_undefine([m4_maketemp])
-
-        # Copy and rename macros not handled by "m4 --prefix".
+        dnl  Replace macros which may abort m4 with a no-op variant.
+        m4_pushdef([m4_assert])
+        m4_pushdef([m4_exit])
+        m4_pushdef([m4_fatal])
+        m4_pushdef([m4_m4exit])
+
+        dnl  Replace macros that might break stderr of m4.
+        m4_pushdef([m4_errprint])
+        m4_pushdef([m4_errprintn])
+        m4_pushdef([m4_include])
+        m4_pushdef([m4_warn])
+
+        dnl  Avoid side-effects of tracing by extract-trace.
+        m4_pushdef([m4_maketemp])
+        m4_pushdef([m4_mkstemp])
+
+        dnl  TODO: reasons for this
+        m4_pushdef([m4_dnl])
+        m4_pushdef([m4_m4wrap])
+
+        dnl  Copy and rename macros not handled by "m4 --prefix".
         m4_define([dnl],         [m4_builtin([dnl])])
         m4_copy([m4_define],     [m4_defun])
         m4_rename([m4_ifelse],   [m4_if])
-        m4_ifdef([m4_mkstemp],   [m4_undefine([m4_mkstemp])])
         m4_rename([m4_patsubst], [m4_bpatsubst])
         m4_rename([m4_regexp],   [m4_bregexp])

-        # "m4sugar.mini" - useful m4-time macros for dynamic arguments.
-        # If we discover packages that need more m4 macros defined in
-        # order to bootstrap correctly, add them here:
+        dnl  "m4sugar.mini" - useful m4-time macros for dynamic arguments.
+        dnl  If we discover packages that need more m4 macros defined in
+        dnl  order to bootstrap correctly, add them here:
         m4_define([m4_bmatch],
             [m4_if([$#], 0, [], [$#], 1, [], [$#], 2, [$2],
                    [m4_if(m4_bregexp([$1], [$2]), -1,
@@ -305,11 +370,11 @@ func_extract_trace ()
         m4_define([m4_require], [$1])
         m4_define([m4_shift3], [m4_shift(m4shift(m4shift($@)))])

-        # "autoconf.mini" - things from autoconf macros we care about.
+        dnl  "autoconf.mini" - things from autoconf macros we care about.
         m4_copy([m4_defun], [AC_DEFUN])

-        # Dummy definitions for the macros we want to trace.
-        # AM_INIT_AUTOMAKE at least produces no trace without this.
+        dnl  Dummy definitions for the macros we want to trace.
+        dnl  AM_INIT_AUTOMAKE at least produces no trace without this.
     '

     _G_save=$IFS
@@ -416,6 +481,6 @@ test extract-trace = "$progname" && func_main "$@"
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp)
-# time-stamp-pattern: "20/scriptversion=%:y-%02m-%02d.%02H; # UTC"
+# time-stamp-pattern: "50/scriptversion=%:y-%02m-%02d.%02H; # UTC"
 # time-stamp-time-zone: "UTC"
 # End:
diff --git a/gl/build-aux/funclib.sh b/gl/build-aux/funclib.sh
index 0f92a352..43162477 100644
--- a/gl/build-aux/funclib.sh
+++ b/gl/build-aux/funclib.sh
@@ -1,33 +1,23 @@
 # Set a version string for this script.
-scriptversion=2014-01-03.01; # UTC
+scriptversion=2019-02-19.15; # UTC

 # General shell script boiler plate, and helper functions.
 # Written by Gary V. Vaughan, 2004

-# Copyright (C) 2004-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
-# 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
-# the Free Software Foundation; either version 3 of the License, or
-# (at your option) any later version.
-
-# As a special exception to the GNU General Public License, if you distribute
-# this file as part of a program or library that is built using GNU Libtool,
-# you may include this file under the same distribution terms that you use
-# for the rest of that program.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNES FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2004-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.
+
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>


 ## ------ ##
@@ -76,9 +66,6 @@ do
        fi"
 done

-# CDPATH.
-(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
-
 # Make sure IFS has a sensible default
 sp=' '
 nl='
@@ -95,6 +82,26 @@ if test "${PATH_SEPARATOR+set}" != set; then
 fi


+# func_unset VAR
+# --------------
+# Portably unset VAR.
+# In some shells, an 'unset VAR' statement leaves a non-zero return
+# status if VAR is already unset, which might be problematic if the
+# statement is used at the end of a function (thus poisoning its return
+# value) or when 'set -e' is active (causing even a spurious abort of
+# the script in this case).
+func_unset ()
+{
+    { eval $1=; (eval unset $1) >/dev/null 2>&1 && eval unset $1 || : ; }
+}
+
+
+# Make sure CDPATH doesn't cause `cd` commands to output the target dir.
+func_unset CDPATH
+
+# Make sure ${,E,F}GREP behave sanely.
+func_unset GREP_OPTIONS
+

 ## ------------------------- ##
 ## Locate command utilities. ##
@@ -128,7 +135,7 @@ func_path_progs ()

     _G_path_prog_max=0
     _G_path_prog_found=false
-    _G_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+    _G_save_IFS=$IFS; IFS=${PATH_SEPARATOR-:}
     for _G_dir in $_G_PATH; do
       IFS=$_G_save_IFS
       test -z "$_G_dir" && _G_dir=.
@@ -195,7 +202,7 @@ test -z "$SED" && {
     rm -f conftest.in conftest.tmp conftest.nl conftest.out
   }

-  func_path_progs "sed gsed" func_check_prog_sed $PATH:/usr/xpg4/bin
+  func_path_progs "sed gsed" func_check_prog_sed "$PATH:/usr/xpg4/bin"
   rm -f conftest.sed
   SED=$func_path_progs_result
 }
@@ -231,7 +238,7 @@ test -z "$GREP" && {
     rm -f conftest.in conftest.tmp conftest.nl conftest.out
   }

-  func_path_progs "grep ggrep" func_check_prog_grep $PATH:/usr/xpg4/bin
+  func_path_progs "grep ggrep" func_check_prog_grep "$PATH:/usr/xpg4/bin"
   GREP=$func_path_progs_result
 }

@@ -516,16 +523,16 @@ if test yes = "$_G_HAVE_PLUSEQ_OP"; then
   {
     $debug_cmd

-    func_quote_for_eval "$2"
-    eval "$1+=\\ \$func_quote_for_eval_result"
+    func_quote_arg pretty "$2"
+    eval "$1+=\\ \$func_quote_arg_result"
   }'
 else
   func_append_quoted ()
   {
     $debug_cmd

-    func_quote_for_eval "$2"
-    eval "$1=\$$1\\ \$func_quote_for_eval_result"
+    func_quote_arg pretty "$2"
+    eval "$1=\$$1\\ \$func_quote_arg_result"
   }
 fi

@@ -1027,85 +1034,199 @@ func_relative_path ()
 }


-# func_quote_for_eval ARG...
-# --------------------------
-# Aesthetically quote ARGs to be evaled later.
-# This function returns two values:
-#   i) func_quote_for_eval_result
-#      double-quoted, suitable for a subsequent eval
-#  ii) func_quote_for_eval_unquoted_result
-#      has all characters that are still active within double
-#      quotes backslashified.
-func_quote_for_eval ()
+# func_quote_portable EVAL ARG
+# ----------------------------
+# Internal function to portably implement func_quote_arg.  Note that we still
+# keep attention to performance here so we as much as possible try to avoid
+# calling sed binary (so far O(N) complexity as long as func_append is O(1)).
+func_quote_portable ()
 {
     $debug_cmd

-    func_quote_for_eval_unquoted_result=
-    func_quote_for_eval_result=
-    while test 0 -lt $#; do
-      case $1 in
+    func_quote_portable_result=$2
+
+    # one-time-loop (easy break)
+    while true
+    do
+      if $1; then
+        func_quote_portable_result=`$ECHO "$2" | $SED \
+          -e "$sed_double_quote_subst" -e "$sed_double_backslash"`
+        break
+      fi
+
+      # Quote for eval.
+      case $func_quote_portable_result in
         *[\\\`\"\$]*)
-         _G_unquoted_arg=`printf '%s\n' "$1" |$SED "$sed_quote_subst"` ;;
-        *)
-          _G_unquoted_arg=$1 ;;
-      esac
-      if test -n "$func_quote_for_eval_unquoted_result"; then
-       func_append func_quote_for_eval_unquoted_result " $_G_unquoted_arg"
-      else
-        func_append func_quote_for_eval_unquoted_result "$_G_unquoted_arg"
-      fi
+          case $func_quote_portable_result in
+            *[\[\*\?]*)
+              func_quote_portable_result=`$ECHO "$func_quote_portable_result" \
+                  | $SED "$sed_quote_subst"`
+              break
+              ;;
+          esac

-      case $_G_unquoted_arg in
-        # Double-quote args containing shell metacharacters to delay
-        # word splitting, command substitution and variable expansion
-        # for a subsequent eval.
-        # Many Bourne shells cannot handle close brackets correctly
-        # in scan sets, so we specify it separately.
-        *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \  ]*|*]*|"")
-          _G_quoted_arg=\"$_G_unquoted_arg\"
+          func_quote_portable_old_IFS=$IFS
+          for _G_char in '\' '`' '"' '$'
+          do
+            # STATE($1) PREV($2) SEPARATOR($3)
+            set start "" ""
+            
func_quote_portable_result=dummy"$_G_char$func_quote_portable_result$_G_char"dummy
+            IFS=$_G_char
+            for _G_part in $func_quote_portable_result
+            do
+              case $1 in
+              quote)
+                func_append func_quote_portable_result "$3$2"
+                set quote "$_G_part" "\\$_G_char"
+                ;;
+              start)
+                set first "" ""
+                func_quote_portable_result=
+                ;;
+              first)
+                set quote "$_G_part" ""
+                ;;
+              esac
+            done
+          done
+          IFS=$func_quote_portable_old_IFS
           ;;
-        *)
-          _G_quoted_arg=$_G_unquoted_arg
-         ;;
+        *) ;;
       esac
-
-      if test -n "$func_quote_for_eval_result"; then
-       func_append func_quote_for_eval_result " $_G_quoted_arg"
-      else
-        func_append func_quote_for_eval_result "$_G_quoted_arg"
-      fi
-      shift
+      break
     done
-}

-
-# func_quote_for_expand ARG
-# -------------------------
-# Aesthetically quote ARG to be evaled later; same as above,
-# but do not quote variable references.
-func_quote_for_expand ()
-{
-    $debug_cmd
-
-    case $1 in
-      *[\\\`\"]*)
-       _G_arg=`$ECHO "$1" | $SED \
-           -e "$sed_double_quote_subst" -e "$sed_double_backslash"` ;;
-      *)
-        _G_arg=$1 ;;
-    esac
-
-    case $_G_arg in
-      # Double-quote args containing shell metacharacters to delay
-      # word splitting and command substitution for a subsequent eval.
-      # Many Bourne shells cannot handle close brackets correctly
+    func_quote_portable_unquoted_result=$func_quote_portable_result
+    case $func_quote_portable_result in
+      # double-quote args containing shell metacharacters to delay
+      # word splitting, command substitution and variable expansion
+      # for a subsequent eval.
+      # many bourne shells cannot handle close brackets correctly
       # in scan sets, so we specify it separately.
       *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \    ]*|*]*|"")
-        _G_arg=\"$_G_arg\"
+        func_quote_portable_result=\"$func_quote_portable_result\"
         ;;
     esac
+}

-    func_quote_for_expand_result=$_G_arg
+
+# func_quotefast_eval ARG
+# -----------------------
+# Quote one ARG (internal).  This is equivalent to 'func_quote_arg eval ARG',
+# but optimized for speed.  Result is stored in $func_quotefast_eval.
+if test xyes = `(x=; printf -v x %q yes; echo x"$x") 2>/dev/null`; then
+  printf -v _GL_test_printf_tilde %q '~'
+  if test '\~' = "$_GL_test_printf_tilde"; then
+    func_quotefast_eval ()
+    {
+      printf -v func_quotefast_eval_result %q "$1"
+    }
+  else
+    # Broken older Bash implementations.  Make those faster too if possible.
+    func_quotefast_eval ()
+    {
+      case $1 in
+        '~'*)
+          func_quote_portable false "$1"
+          func_quotefast_eval_result=$func_quote_portable_result
+          ;;
+        *)
+          printf -v func_quotefast_eval_result %q "$1"
+          ;;
+      esac
+    }
+  fi
+else
+  func_quotefast_eval ()
+  {
+    func_quote_portable false "$1"
+    func_quotefast_eval_result=$func_quote_portable_result
+  }
+fi
+
+
+# func_quote_arg MODEs ARG
+# ------------------------
+# Quote one ARG to be evaled later.  MODEs argument may contain zero or more
+# specifiers listed below separated by ',' character.  This function returns 
two
+# values:
+#   i) func_quote_arg_result
+#      double-quoted (when needed), suitable for a subsequent eval
+#  ii) func_quote_arg_unquoted_result
+#      has all characters that are still active within double
+#      quotes backslashified.  Available only if 'unquoted' is specified.
+#
+# Available modes:
+# ----------------
+# 'eval' (default)
+#       - escape shell special characters
+# 'expand'
+#       - the same as 'eval';  but do not quote variable references
+# 'pretty'
+#       - request aesthetic output, i.e. '"a b"' instead of 'a\ b'.  This might
+#         be used later in func_quote to get output like: 'echo "a b"' instead
+#         of 'echo a\ b'.  This is slower than default on some shells.
+# 'unquoted'
+#       - produce also $func_quote_arg_unquoted_result which does not contain
+#         wrapping double-quotes.
+#
+# Examples for 'func_quote_arg pretty,unquoted string':
+#
+#   string      | *_result              | *_unquoted_result
+#   ------------+-----------------------+-------------------
+#   "           | \"                    | \"
+#   a b         | "a b"                 | a b
+#   "a b"       | "\"a b\""             | \"a b\"
+#   *           | "*"                   | *
+#   z="${x-$y}" | "z=\"\${x-\$y}\""     | z=\"\${x-\$y}\"
+#
+# Examples for 'func_quote_arg pretty,unquoted,expand string':
+#
+#   string        |   *_result          |  *_unquoted_result
+#   --------------+---------------------+--------------------
+#   z="${x-$y}"   | "z=\"${x-$y}\""     | z=\"${x-$y}\"
+func_quote_arg ()
+{
+    _G_quote_expand=false
+    case ,$1, in
+      *,expand,*)
+        _G_quote_expand=:
+        ;;
+    esac
+
+    case ,$1, in
+      *,pretty,*|*,expand,*|*,unquoted,*)
+        func_quote_portable $_G_quote_expand "$2"
+        func_quote_arg_result=$func_quote_portable_result
+        func_quote_arg_unquoted_result=$func_quote_portable_unquoted_result
+        ;;
+      *)
+        # Faster quote-for-eval for some shells.
+        func_quotefast_eval "$2"
+        func_quote_arg_result=$func_quotefast_eval_result
+        ;;
+    esac
+}
+
+
+# func_quote MODEs ARGs...
+# ------------------------
+# Quote all ARGs to be evaled later and join them into single command.  See
+# func_quote_arg's description for more info.
+func_quote ()
+{
+    $debug_cmd
+    _G_func_quote_mode=$1 ; shift
+    func_quote_result=
+    while test 0 -lt $#; do
+      func_quote_arg "$_G_func_quote_mode" "$1"
+      if test -n "$func_quote_result"; then
+        func_append func_quote_result " $func_quote_arg_result"
+      else
+        func_append func_quote_result "$func_quote_arg_result"
+      fi
+      shift
+    done
 }


@@ -1151,8 +1272,8 @@ func_show_eval ()
     _G_cmd=$1
     _G_fail_exp=${2-':'}

-    func_quote_for_expand "$_G_cmd"
-    eval "func_notquiet $func_quote_for_expand_result"
+    func_quote_arg pretty,expand "$_G_cmd"
+    eval "func_notquiet $func_quote_arg_result"

     $opt_dry_run || {
       eval "$_G_cmd"
@@ -1177,8 +1298,8 @@ func_show_eval_locale ()
     _G_fail_exp=${2-':'}

     $opt_quiet || {
-      func_quote_for_expand "$_G_cmd"
-      eval "func_echo $func_quote_for_expand_result"
+      func_quote_arg expand,pretty "$_G_cmd"
+      eval "func_echo $func_quote_arg_result"
     }

     $opt_dry_run || {
diff --git a/gl/build-aux/inline-source b/gl/build-aux/inline-source
index 667bafae..440bedf5 100755
--- a/gl/build-aux/inline-source
+++ b/gl/build-aux/inline-source
@@ -3,33 +3,27 @@
 # Output the contents of a shell script with sourced files inlined.
 # Written by Gary V. Vaughan, 2012

-# Copyright (C) 2012-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2012-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.
+
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>

 # Source required external libraries:
 . `echo "$0" |${SED-sed} 's|[^/]*$||'`"funclib.sh"
 . `echo "$0" |${SED-sed} 's|[^/]*$||'`"options-parser"

 # Set a version string for *this* script.
-scriptversion=2014-01-03.01; # UTC
-
-
-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to bug-libtool@gnu.org.
+scriptversion=2019-02-19.15; # UTC


 ## ------ ##
@@ -160,6 +154,6 @@ exit 0
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp)
-# time-stamp-pattern: "20/scriptversion=%:y-%02m-%02d.%02H; # UTC"
+# time-stamp-pattern: "30/scriptversion=%:y-%02m-%02d.%02H; # UTC"
 # time-stamp-time-zone: "UTC"
 # End:
diff --git a/gl/build-aux/options-parser b/gl/build-aux/options-parser
index bad78a48..458eab6b 100644
--- a/gl/build-aux/options-parser
+++ b/gl/build-aux/options-parser
@@ -1,30 +1,25 @@
 #! /bin/sh

-# Set a version string for this script.
-scriptversion=2014-01-07.03; # UTC
-
 # A portable, pluggable option parser for Bourne shell.
 # Written by Gary V. Vaughan, 2010

-# Copyright (C) 2010-2014, 2016-2017, 2020-2021 Free Software
-# Foundation, Inc.
-# This is free software; see the source for copying conditions.  There is NO
-# warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# This is free software.  There is NO warranty; not even for
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Copyright (C) 2010-2019 Bootstrap Authors
+#
+# This file is dual licensed under the terms of the MIT license
+# <https://opensource.org/license/MIT>, and GPL version 2 or later
+# <http://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
+# these licenses when using or redistributing this software or any of
+# the files within it.  See the URLs above, or the file `LICENSE`
+# included in the Bootstrap distribution for the full license texts.

-# 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
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# Please report bugs or propose patches to:
+# <https://github.com/gnulib-modules/bootstrap/issues>

-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# Please report bugs or propose patches to gary@gnu.org.
+# Set a version string for this script.
+scriptversion=2019-02-19.15; # UTC


 ## ------ ##
@@ -47,7 +42,7 @@ scriptversion=2014-01-07.03; # UTC
 #
 # In order for the '--version' option to work, you will need to have a
 # suitably formatted comment like the one at the top of this file
-# starting with '# Written by ' and ending with '# warranty; '.
+# starting with '# Written by ' and ending with '# Copyright'.
 #
 # For '-h' and '--help' to work, you will also need a one line
 # description of your script's purpose in a comment directly above the
@@ -59,7 +54,7 @@ scriptversion=2014-01-07.03; # UTC
 # to display verbose messages only when your user has specified
 # '--verbose'.
 #
-# After sourcing this file, you can plug processing for additional
+# After sourcing this file, you can plug in processing for additional
 # options by amending the variables from the 'Configuration' section
 # below, and following the instructions in the 'Option parsing'
 # section further down.
@@ -108,8 +103,8 @@ fatal_help="Try '\$progname --help' for more information."
 ## ------------------------- ##

 # This section contains functions for adding, removing, and running hooks
-# to the main code.  A hook is just a named list of of function, that can
-# be run in order later on.
+# in the main code.  A hook is just a list of function names that can be
+# run in order later on.

 # func_hookable FUNC_NAME
 # -----------------------
@@ -142,7 +137,8 @@ func_add_hook ()

 # func_remove_hook FUNC_NAME HOOK_FUNC
 # ------------------------------------
-# Remove HOOK_FUNC from the list of functions called by FUNC_NAME.
+# Remove HOOK_FUNC from the list of hook functions to be called by
+# FUNC_NAME.
 func_remove_hook ()
 {
     $debug_cmd
@@ -151,10 +147,28 @@ func_remove_hook ()
 }


+# func_propagate_result FUNC_NAME_A FUNC_NAME_B
+# ---------------------------------------------
+# If the *_result variable of FUNC_NAME_A _is set_, assign its value to
+# *_result variable of FUNC_NAME_B.
+func_propagate_result ()
+{
+    $debug_cmd
+
+    func_propagate_result_result=:
+    if eval "test \"\${${1}_result+set}\" = set"
+    then
+      eval "${2}_result=\$${1}_result"
+    else
+      func_propagate_result_result=false
+    fi
+}
+
+
 # func_run_hooks FUNC_NAME [ARG]...
 # ---------------------------------
 # Run all hook functions registered to FUNC_NAME.
-# It is assumed that the list of hook functions contains nothing more
+# It's assumed that the list of hook functions contains nothing more
 # than a whitespace-delimited list of legal shell function names, and
 # no effort is wasted trying to catch shell meta-characters or preserve
 # whitespace.
@@ -164,22 +178,19 @@ func_run_hooks ()

     case " $hookable_fns " in
       *" $1 "*) ;;
-      *) func_fatal_error "'$1' does not support hook funcions.n" ;;
+      *) func_fatal_error "'$1' does not support hook functions." ;;
     esac

     eval _G_hook_fns=\$$1_hooks; shift

     for _G_hook in $_G_hook_fns; do
-      eval $_G_hook '"$@"'
-
-      # store returned options list back into positional
-      # parameters for next 'cmd' execution.
-      eval _G_hook_result=\$${_G_hook}_result
-      eval set dummy "$_G_hook_result"; shift
+      func_unset "${_G_hook}_result"
+      eval $_G_hook '${1+"$@"}'
+      func_propagate_result $_G_hook func_run_hooks
+      if $func_propagate_result_result; then
+        eval set dummy "$func_run_hooks_result"; shift
+      fi
     done
-
-    func_quote_for_eval ${1+"$@"}
-    func_run_hooks_result=$func_quote_for_eval_result
 }


@@ -189,10 +200,18 @@ func_run_hooks ()
 ## --------------- ##

 # In order to add your own option parsing hooks, you must accept the
-# full positional parameter list in your hook function, remove any
-# options that you action, and then pass back the remaining unprocessed
-# options in '<hooked_function_name>_result', escaped suitably for
-# 'eval'.  Like this:
+# full positional parameter list from your hook function.  You may remove
+# or edit any options that you action, and then pass back the remaining
+# unprocessed options in '<hooked_function_name>_result', escaped
+# suitably for 'eval'.
+#
+# The '<hooked_function_name>_result' variable is automatically unset
+# before your hook gets called; for best performance, only set the
+# *_result variable when necessary (i.e. don't call the 'func_quote'
+# function unnecessarily because it can be an expensive operation on some
+# machines).
+#
+# Like this:
 #
 #    my_options_prep ()
 #    {
@@ -202,9 +221,8 @@ func_run_hooks ()
 #        usage_message=$usage_message'
 #      -s, --silent       don'\''t print informational messages
 #    '
-#
-#        func_quote_for_eval ${1+"$@"}
-#        my_options_prep_result=$func_quote_for_eval_result
+#        # No change in '$@' (ignored completely by this hook).  Leave
+#        # my_options_prep_result variable intact.
 #    }
 #    func_add_hook func_options_prep my_options_prep
 #
@@ -213,25 +231,36 @@ func_run_hooks ()
 #    {
 #        $debug_cmd
 #
-#        # Note that for efficiency, we parse as many options as we can
+#        args_changed=false
+#
+#        # Note that, for efficiency, we parse as many options as we can
 #        # recognise in a loop before passing the remainder back to the
 #        # caller on the first unrecognised argument we encounter.
 #        while test $# -gt 0; do
 #          opt=$1; shift
 #          case $opt in
-#            --silent|-s) opt_silent=: ;;
+#            --silent|-s) opt_silent=:
+#                         args_changed=:
+#                         ;;
 #            # Separate non-argument short options:
 #            -s*)         func_split_short_opt "$_G_opt"
 #                         set dummy "$func_split_short_opt_name" \
 #                             "-$func_split_short_opt_arg" ${1+"$@"}
 #                         shift
+#                         args_changed=:
 #                         ;;
-#            *)            set dummy "$_G_opt" "$*"; shift; break ;;
+#            *)           # Make sure the first unrecognised option "$_G_opt"
+#                         # is added back to "$@" in case we need it later,
+#                         # if $args_changed was set to 'true'.
+#                         set dummy "$_G_opt" ${1+"$@"}; shift; break ;;
 #          esac
 #        done
 #
-#        func_quote_for_eval ${1+"$@"}
-#        my_silent_option_result=$func_quote_for_eval_result
+#        # Only call 'func_quote' here if we processed at least one argument.
+#        if $args_changed; then
+#          func_quote eval ${1+"$@"}
+#          my_silent_option_result=$func_quote_result
+#        fi
 #    }
 #    func_add_hook func_parse_options my_silent_option
 #
@@ -242,17 +271,26 @@ func_run_hooks ()
 #
 #        $opt_silent && $opt_verbose && func_fatal_help "\
 #    '--silent' and '--verbose' options are mutually exclusive."
-#
-#        func_quote_for_eval ${1+"$@"}
-#        my_option_validation_result=$func_quote_for_eval_result
 #    }
 #    func_add_hook func_validate_options my_option_validation
 #
-# You'll alse need to manually amend $usage_message to reflect the extra
+# You'll also need to manually amend $usage_message to reflect the extra
 # options you parse.  It's preferable to append if you can, so that
 # multiple option parsing hooks can be added safely.


+# func_options_finish [ARG]...
+# ----------------------------
+# Finishing the option parse loop (call 'func_options' hooks ATM).
+func_options_finish ()
+{
+    $debug_cmd
+
+    func_run_hooks func_options ${1+"$@"}
+    func_propagate_result func_run_hooks func_options_finish
+}
+
+
 # func_options [ARG]...
 # ---------------------
 # All the functions called inside func_options are hookable. See the
@@ -262,17 +300,27 @@ func_options ()
 {
     $debug_cmd

-    func_options_prep ${1+"$@"}
-    eval func_parse_options \
-        ${func_options_prep_result+"$func_options_prep_result"}
-    eval func_validate_options \
-        ${func_parse_options_result+"$func_parse_options_result"}
+    _G_options_quoted=false

-    eval func_run_hooks func_options \
-        ${func_validate_options_result+"$func_validate_options_result"}
+    for my_func in options_prep parse_options validate_options options_finish
+    do
+      func_unset func_${my_func}_result
+      func_unset func_run_hooks_result
+      eval func_$my_func '${1+"$@"}'
+      func_propagate_result func_$my_func func_options
+      if $func_propagate_result_result; then
+        eval set dummy "$func_options_result"; shift
+        _G_options_quoted=:
+      fi
+    done

-    # save modified positional parameters for caller
-    func_options_result=$func_run_hooks_result
+    $_G_options_quoted || {
+      # As we (func_options) are top-level options-parser function and
+      # nobody quoted "$@" for us yet, we need to do it explicitly for
+      # caller.
+      func_quote eval ${1+"$@"}
+      func_options_result=$func_quote_result
+    }
 }


@@ -281,9 +329,8 @@ func_options ()
 # All initialisations required before starting the option parse loop.
 # Note that when calling hook functions, we pass through the list of
 # positional parameters.  If a hook function modifies that list, and
-# needs to propogate that back to rest of this script, then the complete
-# modified list must be put in 'func_run_hooks_result' before
-# returning.
+# needs to propagate that back to rest of this script, then the complete
+# modified list must be put in 'func_run_hooks_result' before returning.
 func_hookable func_options_prep
 func_options_prep ()
 {
@@ -294,9 +341,7 @@ func_options_prep ()
     opt_warning_types=

     func_run_hooks func_options_prep ${1+"$@"}
-
-    # save modified positional parameters for caller
-    func_options_prep_result=$func_run_hooks_result
+    func_propagate_result func_run_hooks func_options_prep
 }


@@ -308,25 +353,32 @@ func_parse_options ()
 {
     $debug_cmd

-    func_parse_options_result=
-
+    _G_parse_options_requote=false
     # this just eases exit handling
     while test $# -gt 0; do
       # Defer to hook functions for initial option parsing, so they
       # get priority in the event of reusing an option name.
       func_run_hooks func_parse_options ${1+"$@"}
-
-      # Adjust func_parse_options positional parameters to match
-      eval set dummy "$func_run_hooks_result"; shift
+      func_propagate_result func_run_hooks func_parse_options
+      if $func_propagate_result_result; then
+        eval set dummy "$func_parse_options_result"; shift
+        # Even though we may have changed "$@", we passed the "$@" array
+        # down into the hook and it quoted it for us (because we are in
+        # this if-branch).  No need to quote it again.
+        _G_parse_options_requote=false
+      fi

       # Break out of the loop if we already parsed every option.
       test $# -gt 0 || break

+      # We expect that one of the options parsed in this function matches
+      # and thus we remove _G_opt from "$@" and need to re-quote.
+      _G_match_parse_options=:
       _G_opt=$1
       shift
       case $_G_opt in
         --debug|-x)   debug_cmd='set -x'
-                      func_echo "enabling shell trace mode"
+                      func_echo "enabling shell trace mode" >&2
                       $debug_cmd
                       ;;

@@ -336,7 +388,10 @@ func_parse_options ()
                      ;;

         --warnings|--warning|-W)
-                      test $# = 0 && func_missing_arg $_G_opt && break
+                      if test $# = 0 && func_missing_arg $_G_opt; then
+                        _G_parse_options_requote=:
+                        break
+                      fi
                       case " $warning_categories $1" in
                         *" $1 "*)
                           # trailing space prevents matching last $1 above
@@ -389,15 +444,24 @@ func_parse_options ()
                       shift
                       ;;

-        --)           break ;;
+        --)           _G_parse_options_requote=: ; break ;;
         -*)           func_fatal_help "unrecognised option: '$_G_opt'" ;;
-        *)            set dummy "$_G_opt" ${1+"$@"}; shift; break ;;
+        *)            set dummy "$_G_opt" ${1+"$@"}; shift
+                      _G_match_parse_options=false
+                      break
+                      ;;
       esac
+
+      if $_G_match_parse_options; then
+        _G_parse_options_requote=:
+      fi
     done

-    # save modified positional parameters for caller
-    func_quote_for_eval ${1+"$@"}
-    func_parse_options_result=$func_quote_for_eval_result
+    if $_G_parse_options_requote; then
+      # save modified positional parameters for caller
+      func_quote eval ${1+"$@"}
+      func_parse_options_result=$func_quote_result
+    fi
 }


@@ -414,12 +478,10 @@ func_validate_options ()
     test -n "$opt_warning_types" || opt_warning_types=" $warning_categories"

     func_run_hooks func_validate_options ${1+"$@"}
+    func_propagate_result func_run_hooks func_validate_options

     # Bail if the options were screwed!
     $exit_cmd $EXIT_FAILURE
-
-    # save modified positional parameters for caller
-    func_validate_options_result=$func_run_hooks_result
 }


@@ -475,8 +537,8 @@ func_missing_arg ()

 # func_split_equals STRING
 # ------------------------
-# Set func_split_equals_lhs and func_split_equals_rhs shell variables after
-# splitting STRING at the '=' sign.
+# Set func_split_equals_lhs and func_split_equals_rhs shell variables
+# after splitting STRING at the '=' sign.
 test -z "$_G_HAVE_XSI_OPS" \
     && (eval 'x=a/b/c;
       test 5aa/bb/cc = "${#x}${x%%/*}${x%/*}${x#*/}${x##*/}"') 2>/dev/null \
@@ -491,8 +553,9 @@ then

       func_split_equals_lhs=${1%%=*}
       func_split_equals_rhs=${1#*=}
-      test "x$func_split_equals_lhs" = "x$1" \
-        && func_split_equals_rhs=
+      if test "x$func_split_equals_lhs" = "x$1"; then
+        func_split_equals_rhs=
+      fi
   }'
 else
   # ...otherwise fall back to using expr, which is often a shell builtin.
@@ -570,31 +633,44 @@ func_usage_message ()
 # func_version
 # ------------
 # Echo version message to standard output and exit.
+# The version message is extracted from the calling file's header
+# comments, with leading '# ' stripped:
+#   1. First display the progname and version
+#   2. Followed by the header comment line matching  /^# Written by /
+#   3. Then a blank line followed by the first following line matching
+#      /^# Copyright /
+#   4. Immediately followed by any lines between the previous matches,
+#      except lines preceding the intervening completely blank line.
+# For example, see the header comments of this file.
 func_version ()
 {
     $debug_cmd

     printf '%s\n' "$progname $scriptversion"
     $SED -n '
-        /(C)/!b go
-        :more
-        /\./!{
-          N
-          s|\n# | |
-          b more
+        /^# Written by /!b
+        s|^# ||; p; n
+
+        :fwd2blnk
+        /./ {
+          n
+          b fwd2blnk
         }
-        :go
-        /^# Written by /,/# warranty; / {
-          s|^# ||
-          s|^# *$||
-          s|\((C)\)[ 0-9,-]*[ ,-]\([1-9][0-9]* \)|\1 \2|
-          p
+        p; n
+
+        :holdwrnt
+        s|^# ||
+        s|^# *$||
+        /^Copyright /!{
+          /./H
+          n
+          b holdwrnt
         }
-        /^# Written by / {
-          s|^# ||
-          p
-        }
-        /^warranty; /q' < "$progpath"
+
+        s|\((C)\)[ 0-9,-]*[ ,-]\([1-9][0-9]* \)|\1 \2|
+        G
+        s|\(\n\)\n*|\1|g
+        p; q' < "$progpath"

     exit $?
 }
@@ -604,6 +680,6 @@ func_version ()
 # mode: shell-script
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp)
-# time-stamp-pattern: "10/scriptversion=%:y-%02m-%02d.%02H; # UTC"
+# time-stamp-pattern: "30/scriptversion=%:y-%02m-%02d.%02H; # UTC"
 # time-stamp-time-zone: "UTC"
 # End:
-- 
2.31.1




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