c++: symbols can be empty, so use it

[bison.git] / bootstrap

diff --git a/bootstrap b/bootstrap
index e9849102d8777bcbb19f2d37d386ce0ba45f7466..2fdf267473bdae320c2c260df0e6f50127790929 100755 (executable)
--- a/bootstrap
+++ b/bootstrap
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
 #! /bin/sh
 # Print a version string.

-scriptversion=2012-07-03.20; # UTC
+scriptversion=2014-12-08.12; # UTC

 
 # Bootstrap this package from checked-out sources.
 
 
 # Bootstrap this package from checked-out sources.
 

-# Copyright (C) 2003-2012 Free Software Foundation, Inc.
+# Copyright (C) 2003-2015 Free Software Foundation, Inc.

 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 
 # 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


@@ -42,6 +42,9 @@ export LC_ALL
 
 local_gl_dir=gl
 
 
 local_gl_dir=gl
 

+# Honour $PERL, but work even if there is none
+PERL="${PERL-perl}"
+

 me=$0
 
 usage() {
 me=$0
 
 usage() {


@@ -77,6 +80,33 @@ Running without arguments will suffice in most cases.
 EOF
 }
 
 EOF
 }
 

+# warnf_ FORMAT-STRING ARG1...
+warnf_ ()
+{
+  warnf_format_=$1
+  shift
+  nl='
+'
+  case $* in
+    *$nl*) me_=$(printf "$me"|tr "$nl|" '??')
+       printf "$warnf_format_" "$@" | sed "s|^|$me_: |" ;;
+    *) printf "$me: $warnf_format_" "$@" ;;
+  esac >&2
+}
+
+# warn_ WORD1...
+warn_ ()
+{
+  # If IFS does not start with ' ', set it and emit the warning in a subshell.
+  case $IFS in
+    ' '*) warnf_ '%s\n' "$*";;
+    *)    (IFS=' '; warn_ "$@");;
+  esac
+}
+
+# die WORD1...
+die() { warn_ "$@"; exit 1; }
+

 # Configuration.
 
 # Name of the Makefile.am
 # Configuration.
 
 # Name of the Makefile.am


@@ -113,24 +143,26 @@ po_download_command_format2=\
 "wget --mirror -nd -q -np -A.po -P '%s' \
  http://translationproject.org/latest/%s/"
 
 "wget --mirror -nd -q -np -A.po -P '%s' \
  http://translationproject.org/latest/%s/"
 

+# Prefer a non-empty tarname (4th argument of AC_INIT if given), else
+# fall back to the package name (1st argument with munging)

 extract_package_name='
 extract_package_name='

-  /^AC_INIT(/{
-     /.*,.*,.*, */{
-       s///
-       s/[][]//g
-       s/)$//
+  /^AC_INIT(\[*/{
+     s///
+     /^[^,]*,[^,]*,[^,]*,[ []*\([^][ ,)]\)/{
+       s//\1/
+       s/[],)].*//

        p
        q
      }
        p
        q
      }

-     s/AC_INIT(\[*//
-     s/]*,.*//
+     s/[],)].*//

      s/^GNU //
      y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
      s/^GNU //
      y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/

-     s/[^A-Za-z0-9_]/-/g
+     s/[^abcdefghijklmnopqrstuvwxyz0123456789_]/-/g

      p
   }
 '
      p
   }
 '

-package=$(sed -n "$extract_package_name" configure.ac) || exit
+package=$(sed -n "$extract_package_name" configure.ac) \
+  || die 'cannot find package name in configure.ac'

 gnulib_name=lib$package
 
 build_aux=build-aux
 gnulib_name=lib$package
 
 build_aux=build-aux


@@ -180,12 +212,28 @@ bootstrap_sync=false
 # Use git to update gnulib sources
 use_git=true
 
 # Use git to update gnulib sources
 use_git=true
 

+check_exists() {
+  if test "$1" = "--verbose"; then
+    ($2 --version </dev/null) >/dev/null 2>&1
+    if test $? -ge 126; then
+      # If not found, run with diagnostics as one may be
+      # presented with env variables to set to find the right version
+      ($2 --version </dev/null)
+    fi
+  else
+    ($1 --version </dev/null) >/dev/null 2>&1
+  fi
+
+  test $? -lt 126
+}
+

 # find_tool ENVVAR NAMES...
 # -------------------------
 # Search for a required program.  Use the value of ENVVAR, if set,
 # 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.
+# otherwise find the first of the NAMES that can be run.
+# If found, set ENVVAR to the program name, die otherwise.
+#
+# FIXME: code duplication, see also gnu-web-doc-update.

 find_tool ()
 {
   find_tool_envvar=$1
 find_tool ()
 {
   find_tool_envvar=$1


@@ -193,31 +241,21 @@ find_tool ()
   find_tool_names=$@
   eval "find_tool_res=\$$find_tool_envvar"
   if test x"$find_tool_res" = x; then
   find_tool_names=$@
   eval "find_tool_res=\$$find_tool_envvar"
   if test x"$find_tool_res" = x; then

-    for i
-    do
-      if ($i --version </dev/null) >/dev/null 2>&1; then
-       find_tool_res=$i
-       break
+    for i; do
+      if check_exists $i; then
+        find_tool_res=$i
+        break

       fi
     done
       fi
     done

-  else
-    find_tool_error_prefix="\$$find_tool_envvar: "

   fi
   if test x"$find_tool_res" = x; then
   fi
   if test x"$find_tool_res" = x; then

-    echo >&2 "$me: one of these is required: $find_tool_names"
-    exit 1
+    warn_ "one of these is required: $find_tool_names;"
+    die   "alternatively set $find_tool_envvar to a compatible tool"

   fi
   fi

-  ($find_tool_res --version </dev/null) >/dev/null 2>&1 || {
-    echo >&2 "$me: ${find_tool_error_prefix}cannot run $find_tool_res --version"
-    exit 1
-  }

   eval "$find_tool_envvar=\$find_tool_res"
   eval "export $find_tool_envvar"
 }
 
   eval "$find_tool_envvar=\$find_tool_res"
   eval "export $find_tool_envvar"
 }
 

-# Find sha1sum, named gsha1sum on MacPorts, and shasum on Mac OS X 10.6.
-find_tool SHA1SUM sha1sum gsha1sum shasum
-

 # Override the default configuration, if necessary.
 # Make sure that bootstrap.conf is sourced from the current directory
 # if we were invoked as "sh bootstrap".
 # Override the default configuration, if necessary.
 # Make sure that bootstrap.conf is sourced from the current directory
 # if we were invoked as "sh bootstrap".


@@ -229,12 +267,12 @@ esac
 # Extra files from gnulib, which override files from other sources.
 test -z "${gnulib_extra_files}" && \
   gnulib_extra_files="
 # Extra files from gnulib, which override files from other sources.
 test -z "${gnulib_extra_files}" && \
   gnulib_extra_files="

-        $build_aux/install-sh
-        $build_aux/mdate-sh
-        $build_aux/texinfo.tex
-        $build_aux/depcomp
-        $build_aux/config.guess
-        $build_aux/config.sub
+        build-aux/install-sh
+        build-aux/mdate-sh
+        build-aux/texinfo.tex
+        build-aux/depcomp
+        build-aux/config.guess
+        build-aux/config.sub

         doc/INSTALL
 "
 
         doc/INSTALL
 "
 


@@ -269,51 +307,45 @@ do
   --no-git)
     use_git=false;;
   *)
   --no-git)
     use_git=false;;
   *)

-    echo >&2 "$0: $option: unknown option"
-    exit 1;;
+    die "$option: unknown option";;

   esac
 done
 
   esac
 done
 

-if $use_git || test -d "$GNULIB_SRCDIR"; then
-  :
-else
-  echo "$0: Error: --no-git requires --gnulib-srcdir" >&2
-  exit 1
-fi
+$use_git || test -d "$GNULIB_SRCDIR" \
+  || die "Error: --no-git requires --gnulib-srcdir"

 
 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
 
 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then

-  echo "$0: Bootstrapping from a non-checked-out distribution is risky." >&2
-  exit 1
+  die "Bootstrapping from a non-checked-out distribution is risky."

 fi
 
 fi
 

-# Ensure that lines starting with ! sort last, per gitignore conventions
-# for whitelisting exceptions after a more generic blacklist pattern.
-sort_patterns() {
-  sort -u "$@" | sed '/^!/ {
-    H
-    d
-  }
-  $ {
-    P
-    x
-    s/^\n//
-  }' | sed '/^$/d'
+# Strip blank and comment lines to leave significant entries.
+gitignore_entries() {
+  sed '/^#/d; /^$/d' "$@"

 }
 
 }
 

-# If $STR is not already on a line by itself in $FILE, insert it,
-# sorting the new contents of the file and replacing $FILE with the result.
-insert_sorted_if_absent() {
+# If $STR is not already on a line by itself in $FILE, insert it at the start.
+# Entries are inserted at the start of the ignore list to ensure existing
+# entries starting with ! are not overridden.  Such entries support
+# whitelisting exceptions after a more generic blacklist pattern.
+insert_if_absent() {

   file=$1
   str=$2
   test -f $file || touch $file
   file=$1
   str=$2
   test -f $file || touch $file

-  echo "$str" | sort_patterns - $file | cmp -s - $file > /dev/null \
-    || { echo "$str" | sort_patterns - $file > $file.bak \
-      && mv $file.bak $file; } \
-    || exit 1
+  test -r $file || die "Error: failed to read ignore file: $file"
+  duplicate_entries=$(gitignore_entries $file | sort | uniq -d)
+  if [ "$duplicate_entries" ] ; then
+    die "Error: Duplicate entries in $file: " $duplicate_entries
+  fi
+  linesold=$(gitignore_entries $file | wc -l)
+  linesnew=$( { echo "$str"; cat $file; } | gitignore_entries | sort -u | wc -l)
+  if [ $linesold != $linesnew ] ; then
+    { echo "$str" | cat - $file > $file.bak && mv $file.bak $file; } \
+      || die "insert_if_absent $file $str: failed"
+  fi

 }
 
 # Adjust $PATTERN for $VC_IGNORE_FILE and insert it with
 }
 
 # Adjust $PATTERN for $VC_IGNORE_FILE and insert it with

-# insert_sorted_if_absent.
+# insert_if_absent.

 insert_vc_ignore() {
   vc_ignore_file="$1"
   pattern="$2"
 insert_vc_ignore() {
   vc_ignore_file="$1"
   pattern="$2"


@@ -324,7 +356,7 @@ insert_vc_ignore() {
     # .gitignore entry.
     pattern=$(echo "$pattern" | sed s,^,/,);;
   esac
     # .gitignore entry.
     pattern=$(echo "$pattern" | sed s,^,/,);;
   esac

-  insert_sorted_if_absent "$vc_ignore_file" "$pattern"
+  insert_if_absent "$vc_ignore_file" "$pattern"

 }
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
 }
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.


@@ -333,11 +365,8 @@ grep '^[    ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'\])' configure.ac \
     >/dev/null && found_aux_dir=yes
 grep '^[        ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
     >/dev/null && found_aux_dir=yes
     >/dev/null && found_aux_dir=yes
 grep '^[        ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
     >/dev/null && found_aux_dir=yes

-if test $found_aux_dir = no; then
-  echo "$0: expected line not found in configure.ac. Add the following:" >&2
-  echo "  AC_CONFIG_AUX_DIR([$build_aux])" >&2
-  exit 1
-fi
+test $found_aux_dir = yes \
+  || die "configure.ac lacks 'AC_CONFIG_AUX_DIR([$build_aux])'; add it"

 
 # If $build_aux doesn't exist, create it now, otherwise some bits
 # below will malfunction.  If creating it, also mark it as ignored.
 
 # If $build_aux doesn't exist, create it now, otherwise some bits
 # below will malfunction.  If creating it, also mark it as ignored.


@@ -392,7 +421,7 @@ sort_ver() { # sort -V is not generally available
 get_version() {
   app=$1
 
 get_version() {
   app=$1
 

-  $app --version >/dev/null 2>&1 || return 1
+  $app --version >/dev/null 2>&1 || { $app --version; return 1; }

 
   $app --version 2>&1 |
   sed -n '# Move version to start of line.
 
   $app --version 2>&1 |
   sed -n '# Move version to start of line.


@@ -430,6 +459,7 @@ check_versions() {
     test "$appvar" = TAR && appvar=AMTAR
     case $appvar in
         GZIP) ;; # Do not use $GZIP:  it contains gzip options.
     test "$appvar" = TAR && appvar=AMTAR
     case $appvar in
         GZIP) ;; # Do not use $GZIP:  it contains gzip options.

+        PERL::*) ;; # Keep perl modules as-is

         *) eval "app=\${$appvar-$app}" ;;
     esac
 
         *) eval "app=\${$appvar-$app}" ;;
     esac
 


@@ -443,30 +473,41 @@ check_versions() {
       automake-ng|aclocal-ng)
         app=${app%-ng}
         ($app --version | grep '(GNU automake-ng)') >/dev/null 2>&1 || {
       automake-ng|aclocal-ng)
         app=${app%-ng}
         ($app --version | grep '(GNU automake-ng)') >/dev/null 2>&1 || {

-          echo "$me: Error: '$app' not found or not from Automake-NG" >&2
+          warn_ "Error: '$app' not found or not from Automake-NG"

           ret=1
           continue
         } ;;
           ret=1
           continue
         } ;;

+      # Another check is for perl modules.  These can be written as
+      # e.g. perl::XML::XPath in case of XML::XPath module, etc.
+      perl::*)
+        # Extract module name
+        app="${app#perl::}"
+        if ! $PERL -m"$app" -e 'exit 0' >/dev/null 2>&1; then
+          warn_ "Error: perl module '$app' not found"
+          ret=1
+        fi
+        continue
+        ;;

     esac
     if [ "$req_ver" = "-" ]; then
       # Merely require app to exist; not all prereq apps are well-behaved
       # so we have to rely on $? rather than get_version.
     esac
     if [ "$req_ver" = "-" ]; then
       # Merely require app to exist; not all prereq apps are well-behaved
       # so we have to rely on $? rather than get_version.

-      $app --version >/dev/null 2>&1
-      if [ 126 -le $? ]; then
-        echo "$me: Error: '$app' not found" >&2
+      if ! check_exists --verbose $app; then
+        warn_ "Error: '$app' not found"

         ret=1
       fi
     else
       # Require app to produce a new enough version string.
       inst_ver=$(get_version $app)
       if [ ! "$inst_ver" ]; then
         ret=1
       fi
     else
       # Require app to produce a new enough version string.
       inst_ver=$(get_version $app)
       if [ ! "$inst_ver" ]; then

-        echo "$me: Error: '$app' not found" >&2
+        warn_ "Error: '$app' not found"

         ret=1
       else
         latest_ver=$(sort_ver $req_ver $inst_ver | cut -d' ' -f2)
         if [ ! "$latest_ver" = "$inst_ver" ]; then
         ret=1
       else
         latest_ver=$(sort_ver $req_ver $inst_ver | cut -d' ' -f2)
         if [ ! "$latest_ver" = "$inst_ver" ]; then

-          echo "$me: Error: '$app' version == $inst_ver is too old" >&2
-          echo "       '$app' version >= $req_ver is required" >&2
+          warnf_ '%s\n'                                        \
+              "Error: '$app' version == $inst_ver is too old"  \
+              "       '$app' version >= $req_ver is required"

           ret=1
         fi
       fi
           ret=1
         fi
       fi


@@ -484,6 +525,12 @@ print_versions() {
   # can't depend on column -t
 }
 
   # can't depend on column -t
 }
 

+# Find sha1sum, named gsha1sum on MacPorts, shasum on Mac OS X 10.6.
+# Also find the compatible sha1 utility on the BSDs
+if test x"$SKIP_PO" = x; then
+  find_tool SHA1SUM sha1sum gsha1sum shasum sha1
+fi
+

 use_libtool=0
 # We'd like to use grep -E, to see if any of LT_INIT,
 # AC_PROG_LIBTOOL, AM_PROG_LIBTOOL is used in configure.ac,
 use_libtool=0
 # We'd like to use grep -E, to see if any of LT_INIT,
 # AC_PROG_LIBTOOL, AM_PROG_LIBTOOL is used in configure.ac,


@@ -523,20 +570,27 @@ fi
 if ! printf "$buildreq" | check_versions; then
   echo >&2
   if test -f README-prereq; then
 if ! printf "$buildreq" | check_versions; then
   echo >&2
   if test -f README-prereq; then

-    echo "$0: See README-prereq for how to get the prerequisite programs" >&2
+    die "See README-prereq for how to get the prerequisite programs"

   else
   else

-    echo "$0: Please install the prerequisite programs" >&2
+    die "Please install the prerequisite programs"

   fi
   fi

-  exit 1
+fi
+
+# Warn the user if autom4te appears to be broken; this causes known
+# issues with at least gettext 0.18.3.
+probe=$(echo 'm4_quote([hi])' | autom4te -l M4sugar -t 'm4_quote:$%' -)
+if test "x$probe" != xhi; then
+  warn_ "WARNING: your autom4te wrapper eats stdin;"
+  warn_ "if bootstrap fails, consider upgrading your autotools"

 fi
 
 echo "$0: Bootstrapping from checked-out $package sources..."
 
 # See if we can use gnulib's git-merge-changelog merge driver.
 fi
 
 echo "$0: Bootstrapping from checked-out $package sources..."
 
 # See if we can use gnulib's git-merge-changelog merge driver.

-if test -d .git && (git --version) >/dev/null 2>/dev/null ; then
+if $use_git && test -d .git && check_exists git; then

   if git config merge.merge-changelog.driver >/dev/null ; then
     :
   if git config merge.merge-changelog.driver >/dev/null ; then
     :

-  elif (git-merge-changelog --version) >/dev/null 2>/dev/null ; then
+  elif check_exists git-merge-changelog; then

     echo "$0: initializing git-merge-changelog driver"
     git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
     git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
     echo "$0: initializing git-merge-changelog driver"
     git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
     git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'


@@ -556,17 +610,21 @@ git_modules_config () {
   test -f .gitmodules && git config --file .gitmodules "$@"
 }
 
   test -f .gitmodules && git config --file .gitmodules "$@"
 }
 

-gnulib_path=$(git_modules_config submodule.gnulib.path)
-test -z "$gnulib_path" && gnulib_path=gnulib
+if $use_git; then
+  gnulib_path=$(git_modules_config submodule.gnulib.path)
+  test -z "$gnulib_path" && gnulib_path=gnulib
+fi

 
 

-# Get gnulib files.
+# Get gnulib files.  Populate $GNULIB_SRCDIR, possibly updating a
+# submodule, for use in the rest of the script.

 
 case ${GNULIB_SRCDIR--} in
 -)
 
 case ${GNULIB_SRCDIR--} in
 -)

+  # Note that $use_git is necessarily true in this case.

   if git_modules_config submodule.gnulib.url >/dev/null; then
     echo "$0: getting gnulib files..."
   if git_modules_config submodule.gnulib.url >/dev/null; then
     echo "$0: getting gnulib files..."

-    git submodule init || exit $?
-    git submodule update || exit $?
+    git submodule init -- "$gnulib_path" || exit $?
+    git submodule update -- "$gnulib_path" || exit $?

 
   elif [ ! -d "$gnulib_path" ]; then
     echo "$0: getting gnulib files..."
 
   elif [ ! -d "$gnulib_path" ]; then
     echo "$0: getting gnulib files..."


@@ -583,8 +641,8 @@ case ${GNULIB_SRCDIR--} in
   GNULIB_SRCDIR=$gnulib_path
   ;;
 *)
   GNULIB_SRCDIR=$gnulib_path
   ;;
 *)

-  # Use GNULIB_SRCDIR as a reference.
-  if test -d "$GNULIB_SRCDIR"/.git && \
+  # Use GNULIB_SRCDIR directly or as a reference.
+  if $use_git && test -d "$GNULIB_SRCDIR"/.git && \

         git_modules_config submodule.gnulib.url >/dev/null; then
     echo "$0: getting gnulib files..."
     if git submodule -h|grep -- --reference > /dev/null; then
         git_modules_config submodule.gnulib.url >/dev/null; then
     echo "$0: getting gnulib files..."
     if git submodule -h|grep -- --reference > /dev/null; then


@@ -595,13 +653,14 @@ case ${GNULIB_SRCDIR--} in
       # This fallback allows at least git 1.5.5.
       if test -f "$gnulib_path"/gnulib-tool; then
         # Since file already exists, assume submodule init already complete.
       # This fallback allows at least git 1.5.5.
       if test -f "$gnulib_path"/gnulib-tool; then
         # Since file already exists, assume submodule init already complete.

-        git submodule update || exit $?
+        git submodule update -- "$gnulib_path" || exit $?

       else
         # Older git can't clone into an empty directory.
         rmdir "$gnulib_path" 2>/dev/null
         git clone --reference "$GNULIB_SRCDIR" \
           "$(git_modules_config submodule.gnulib.url)" "$gnulib_path" \
       else
         # Older git can't clone into an empty directory.
         rmdir "$gnulib_path" 2>/dev/null
         git clone --reference "$GNULIB_SRCDIR" \
           "$(git_modules_config submodule.gnulib.url)" "$gnulib_path" \

-          && git submodule init && git submodule update \
+          && git submodule init -- "$gnulib_path" \
+          && git submodule update -- "$gnulib_path" \

           || exit $?
       fi
     fi
           || exit $?
       fi
     fi


@@ -610,12 +669,19 @@ case ${GNULIB_SRCDIR--} in
   ;;
 esac
 
   ;;
 esac
 

+# $GNULIB_SRCDIR now points to the version of gnulib to use, and
+# we no longer need to use git or $gnulib_path below here.
+

 if $bootstrap_sync; then
   cmp -s "$0" "$GNULIB_SRCDIR/build-aux/bootstrap" || {
     echo "$0: updating bootstrap and restarting..."
 if $bootstrap_sync; then
   cmp -s "$0" "$GNULIB_SRCDIR/build-aux/bootstrap" || {
     echo "$0: updating bootstrap and restarting..."

+    case $(sh -c 'echo "$1"' -- a) in
+      a) ignored=--;;
+      *) ignored=ignored;;
+    esac

     exec sh -c \
       'cp "$1" "$2" && shift && exec "${CONFIG_SHELL-/bin/sh}" "$@"' \
     exec sh -c \
       'cp "$1" "$2" && shift && exec "${CONFIG_SHELL-/bin/sh}" "$@"' \

-      -- "$GNULIB_SRCDIR/build-aux/bootstrap" \
+      $ignored "$GNULIB_SRCDIR/build-aux/bootstrap" \

       "$0" "$@" --no-bootstrap-sync
   }
 fi
       "$0" "$@" --no-bootstrap-sync
   }
 fi


@@ -663,11 +729,10 @@ update_po_files() {
     cksum_file="$ref_po_dir/$po.s1"
     if ! test -f "$cksum_file" ||
         ! test -f "$po_dir/$po.po" ||
     cksum_file="$ref_po_dir/$po.s1"
     if ! test -f "$cksum_file" ||
         ! test -f "$po_dir/$po.po" ||

-        ! $SHA1SUM -c --status "$cksum_file" \
-            < "$new_po" > /dev/null; then
+        ! $SHA1SUM -c "$cksum_file" < "$new_po" > /dev/null 2>&1; then

       echo "$me: updated $po_dir/$po.po..."
       cp "$new_po" "$po_dir/$po.po" \
       echo "$me: updated $po_dir/$po.po..."
       cp "$new_po" "$po_dir/$po.po" \

-          && $SHA1SUM < "$new_po" > "$cksum_file"
+          && $SHA1SUM < "$new_po" > "$cksum_file" || return

     fi
   done
 }
     fi
   done
 }


@@ -738,11 +803,10 @@ symlink_to_dir()
         *)
           case /$dst/ in
           *//* | */../* | */./* | /*/*/*/*/*/)
         *)
           case /$dst/ in
           *//* | */../* | */./* | /*/*/*/*/*/)

-             echo >&2 "$me: invalid symlink calculation: $src -> $dst"
-             exit 1;;
-          /*/*/*/*/)   dot_dots=../../../;;
-          /*/*/*/)     dot_dots=../../;;
-          /*/*/)       dot_dots=../;;
+             die "invalid symlink calculation: $src -> $dst";;
+          /*/*/*/*/)    dot_dots=../../../;;
+          /*/*/*/)      dot_dots=../../;;
+          /*/*/)        dot_dots=../;;

           esac;;
         esac
 
           esac;;
         esac
 


@@ -764,7 +828,7 @@ version_controlled_file() {
     grep -F "/${file##*/}/" "$parent/CVS/Entries" 2>/dev/null |
              grep '^/[^/]*/[0-9]' > /dev/null
   else
     grep -F "/${file##*/}/" "$parent/CVS/Entries" 2>/dev/null |
              grep '^/[^/]*/[0-9]' > /dev/null
   else

-    echo "$me: no version control for $file?" >&2
+    warn_ "no version control for $file?"

     false
   fi
 }
     false
   fi
 }


@@ -855,11 +919,11 @@ $gnulib_tool $gnulib_tool_options --import $gnulib_modules &&
 
 for file in $gnulib_files; do
   symlink_to_dir "$GNULIB_SRCDIR" $file \
 
 for file in $gnulib_files; do
   symlink_to_dir "$GNULIB_SRCDIR" $file \

-    || { echo "$0: failed to symlink $file" 1>&2; exit 1; }
+    || die "failed to symlink $file"

 done
 
 bootstrap_post_import_hook \
 done
 
 bootstrap_post_import_hook \

-  || { echo >&2 "$me: bootstrap_post_import_hook failed"; exit 1; }
+  || die "bootstrap_post_import_hook failed"

 
 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
 # gnulib-populated directories.  Such .m4 files would cause aclocal to fail.
 
 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
 # gnulib-populated directories.  Such .m4 files would cause aclocal to fail.


@@ -873,21 +937,22 @@ find "$m4_base" "$source_base" \
   -depth \( -name '*.m4' -o -name '*.[ch]' \) \
   -type l -xtype l -delete > /dev/null 2>&1
 
   -depth \( -name '*.m4' -o -name '*.[ch]' \) \
   -type l -xtype l -delete > /dev/null 2>&1
 

+# Invoke autoreconf with --force --install to ensure upgrades of tools
+# such as ylwrap.
+AUTORECONFFLAGS="--verbose --install --force -I $m4_base $ACLOCAL_FLAGS"
+

 # Some systems (RHEL 5) are using ancient autotools, for which the
 # --no-recursive option had not been invented.  Detect that lack and
 # omit the option when it's not supported.  FIXME in 2017: remove this
 # hack when RHEL 5 autotools are updated, or when they become irrelevant.
 # Some systems (RHEL 5) are using ancient autotools, for which the
 # --no-recursive option had not been invented.  Detect that lack and
 # omit the option when it's not supported.  FIXME in 2017: remove this
 # hack when RHEL 5 autotools are updated, or when they become irrelevant.

-no_recursive=

 case $($AUTORECONF --help) in
 case $($AUTORECONF --help) in

-  *--no-recursive*) no_recursive=--no-recursive;;
+  *--no-recursive*) AUTORECONFFLAGS="$AUTORECONFFLAGS --no-recursive";;

 esac
 
 # Tell autoreconf not to invoke autopoint or libtoolize; they were run above.
 esac
 
 # Tell autoreconf not to invoke autopoint or libtoolize; they were run above.

-echo "running: AUTOPOINT=true LIBTOOLIZE=true " \
-    "$AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS"
-AUTOPOINT=true LIBTOOLIZE=true \
-    $AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS \
-  || exit 1
+echo "running: AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS"
+AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS \
+  || die "autoreconf failed"

 
 # Get some extra files from gnulib, overriding existing files.
 for file in $gnulib_extra_files; do
 
 # Get some extra files from gnulib, overriding existing files.
 for file in $gnulib_extra_files; do


@@ -897,7 +962,7 @@ for file in $gnulib_extra_files; do
   *) dst=$file;;
   esac
   symlink_to_dir "$GNULIB_SRCDIR" $file $dst \
   *) dst=$file;;
   esac
   symlink_to_dir "$GNULIB_SRCDIR" $file $dst \

-    || { echo "$0: failed to symlink $file" 1>&2; exit 1; }
+    || die "failed to symlink $file"

 done
 
 if test $with_gettext = yes; then
 done
 
 if test $with_gettext = yes; then


@@ -913,7 +978,8 @@ if test $with_gettext = yes; then
       a\
           '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
     }
       a\
           '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
     }

-  ' po/Makevars.template >po/Makevars || exit 1
+  ' po/Makevars.template >po/Makevars \
+    || die 'cannot generate po/Makevars'

 
   # If the 'gettext' module is in use, grab the latest Makefile.in.in.
   # If only the 'gettext-h' module is in use, assume autopoint already
 
   # If the 'gettext' module is in use, grab the latest Makefile.in.in.
   # If only the 'gettext-h' module is in use, assume autopoint already


@@ -921,7 +987,8 @@ if test $with_gettext = yes; then
   case $gnulib_modules in
   *gettext-h*) ;;
   *gettext*)
   case $gnulib_modules in
   *gettext-h*) ;;
   *gettext*)

-    cp $GNULIB_SRCDIR/build-aux/po/Makefile.in.in po/Makefile.in.in || exit 1
+    cp $GNULIB_SRCDIR/build-aux/po/Makefile.in.in po/Makefile.in.in \
+      || die "cannot create po/Makefile.in.in"

     ;;
   esac
 
     ;;
   esac
 


@@ -937,7 +1004,8 @@ if test $with_gettext = yes; then
         a\
             '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
       }
         a\
             '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
       }

-    ' po/Makevars.template >runtime-po/Makevars || exit 1
+    ' po/Makevars.template >runtime-po/Makevars \
+    || die 'cannot generate runtime-po/Makevars'

 
     # Copy identical files from po to runtime-po.
     (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)
 
     # Copy identical files from po to runtime-po.
     (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)