#! /bin/sh
# -*- shell-script -*-
# autoconf -- create `configure' using m4 macros
# Copyright 1992, 1993, 1994, 1996, 1999, 2000, 2001
# 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
# the Free Software Foundation; either version 2, 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

me=`echo "$0" | sed -e 's,.*[\\/],,'`

usage="\
Usage: $0 [OPTION] ... [TEMPLATE-FILE]

Generate a configuration script from a TEMPLATE-FILE if given, or
\`configure.ac' if present, or else \`configure.in'.  Output is sent
to the standard output if TEMPLATE-FILE is given, else into
\`configure'.

Operation modes:
  -h, --help               print this help, then exit
  -V, --version            print version number, then exit
  -v, --verbose            verbosely report processing
  -d, --debug              don't remove temporary files
  -o, --output=FILE        save output in FILE (stdout is the default)
  -W, --warnings=CATEGORY  report the warnings falling in CATEGORY [syntax]

Warning categories include:
  \`cross'         cross compilation issues
  \`obsolete'      obsolete constructs
  \`syntax'        dubious syntactic constructs
  \`all'           all the warnings
  \`no-CATEGORY'   turn off the warnings on CATEGORY
  \`none'          turn off all the warnings
  \`error'         warnings are error

The environment variable \`WARNINGS' is honored.

Library directories:
  -A, --autoconf-dir=ACDIR  Autoconf's macro files location (rarely needed)
  -l, --localdir=DIR        location of the \`aclocal.m4' file

Tracing:
  -t, --trace=MACRO     report the list of calls to MACRO
  -i, --initialization  also trace Autoconf's initialization process

In tracing mode, no configuration script is created.

Report bugs to <bug-autoconf@gnu.org>."

version="\
autoconf (GNU Autoconf) 2.52
Written by David J. MacKenzie.

Copyright 1992, 1993, 1994, 1996, 1999, 2000, 2001
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."

help="\
Try \`$me --help' for more information."

exit_missing_arg="\
echo \"$me: option \\\`\$1' requires an argument\" >&2
echo \"\$help\" >&2
exit 1"

# NLS nuisances.
if test "${LANG+set}"   = set; then LANG=C;   export LANG;   fi
if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
if test "${LC_CTYPE+set}"    = set; then LC_CTYPE=C;    export LC_CTYPE;    fi
if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi

# ac_LF_and_DOT
# We use echo to avoid assuming a particular line-breaking character.
# The extra dot is to prevent the shell from consuming trailing
# line-breaks from the sub-command output.  A line-break within
# single-quotes doesn't work because, if this script is created in a
# platform that uses two characters for line-breaks (e.g., DOS), tr
# would break.
ac_LF_and_DOT=`echo; echo .`

# Find GNU m4.
# Handle the case that m4 has moved since we were configured.
# It may have been found originally in a build directory.
: ${M4=/usr/bin/m4}
case "$M4" in
  [\\/]* | ?:[\\/]*) test -f "$M4" || M4=m4 ;;
esac
# Some non-GNU m4's don't reject the --help option, so give them /dev/null.
case `$M4 --help </dev/null 2>&1` in
*reload-state*);;
*) echo "$me: Autoconf requires GNU m4 1.4 or later" >&2; exit 1 ;;
esac

# Set some high recursion limit as the default limit, 250, has already
# been hit with AC_OUTPUT.
case " $M4 " in
  *" --nesting-limit"* | *" -L"* )
  # Don't override the user's choice
  ;;
  *) M4="$M4 --nesting-limit=1024"
  ;;
esac


# Find a good AWK.
: ${AWK=gawk}
if echo xfoo | $AWK '/foo|^bar$/ { print }' | grep xfoo >/dev/null; then :; else
  echo "$me: the regex engine of $AWK is too broken to be used" >&2
  echo "$me: you might want to install GNU AWK" >&2
  exit 1
fi


# Variables.
: ${autoconf_dir=${AC_MACRODIR=/usr/share/autoconf}}
test -z "$AC_ACLOCALDIR" &&
  AC_ACLOCALDIR=`(aclocal --print-ac-dir) 2>/dev/null`
debug=false
# Trace Autoconf's initialization?
initialization=false
localdir=.
outfile=
# Exit status.
status=0
# Tasks:
# - trace
#   Trace the first arguments of some macros
# - script
#   Produce the configure script (default)
task=script
tmp=
verbose=:

# Parse command line.
while test $# -gt 0 ; do
  optarg=`expr "x$1" : 'x--[^=]*=\(.*\)' \| \
               "x$1" : 'x-.\(.*\)'`
  case $1 in
    --version | -V )
       echo "$version" ; exit 0 ;;
    --help | -h )
       echo "$usage"; exit 0 ;;

    --debug | -d )
       debug=:; shift ;;
    --verbose | -v )
       verbose=echo
       shift;;

    --localdir=* | -l?* )
       localdir=$optarg
       shift ;;
    --localdir | -l )
       test $# = 1 && eval "$exit_missing_arg"
       shift
       localdir=$1
       shift ;;

    --autoconf-dir=* | -A?* )
      autoconf_dir=$optarg
       shift ;;
    --autoconf-dir | -A )
       test $# = 1 && eval "$exit_missing_arg"
       shift
       autoconf_dir=$1
       shift ;;
    --macrodir=* | -m?* )
       echo "$me: warning: --macrodir is obsolete, use --autoconf-dir" >&2
       autoconf_dir=$optarg
       shift ;;
    --macrodir | -m )
       echo "$me: warning: --macrodir is obsolete, use --autoconf-dir" >&2
       test $# = 1 && eval "$exit_missing_arg"
       shift
       autoconf_dir=$1
       shift ;;

    --trace=* | -t?* )
       task=trace
       traces="$traces '"`echo "$optarg" | sed "s/'/'\\\\\\\\''/g"`"'"
       shift ;;
    --trace | -t )
       test $# = 1 && eval "$exit_missing_arg"
       task=trace
       shift
       traces="$traces '"`echo "$1" | sed "s/'/'\\\\\\\\''/g"`"'"
       shift ;;
    --initialization | -i )
       initialization=:
       shift;;

    --output=* | -o?* )
       outfile=$optarg
       shift ;;
    --output | -o )
       test $# = 1 && eval "$exit_missing_arg"
       shift
       outfile=$1
       shift ;;

    --warnings=* | -W?* )
       warnings=$warnings,$optarg
       shift ;;
    --warnings | -W )
       test $# = 1 && eval "$exit_missing_arg"
       shift
       warnings=$warnings,$1
       shift ;;

    -- )     # Stop option processing
       shift; break ;;
    - )	# Use stdin as input.
       break ;;
    -* )
       exec >&2
       echo "$me: invalid option $1"
       echo "$help"
       exit 1 ;;
    * )
       break ;;
  esac
done

# The warnings are the concatenation of 1. application's defaults,
# 2. $WARNINGS, $3 command line options, in that order.
# Set them in the order expected by the M4 macros: the converse.
alphabet='abcdefghijklmnopqrstuvwxyz'
ALPHABET='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
NUMBERS='0123456789'
WORDCHAR=_$alphabet$ALPHABET$NUMBERS

m4_warnings=
for warning in `IFS=,; echo syntax $WARNINGS $warnings |
                         tr $ALPHABET $alphabet`
do
  test -n $warning || continue
  m4_warnings="$warning"`test -n "$m4_warnings" && echo ",$m4_warnings"`
done


# Trap on 0 to stop playing with `rm'.
$debug ||
{
  trap 'status=$?; rm -rf $tmp && exit $status' 0
  trap '(exit 1); exit 1' 1 2 13 15
}

# Create a (secure) tmp directory for tmp files.
: ${TMPDIR=/tmp}
{
  tmp=`(umask 077 && mktemp -d -q "$TMPDIR/acXXXXXX") 2>/dev/null` &&
  test -n "$tmp" && test -d "$tmp"
} ||
{
  tmp=$TMPDIR/ac$$
  (umask 077 && mkdir $tmp)
} ||
{
   echo "$me: cannot create a temporary directory in $TMPDIR" >&2
   (exit 1); exit 1;
}

# Running m4.
test -f "$autoconf_dir/acsite.m4" && acsite_m4="$autoconf_dir/acsite.m4"
test -f "$localdir/aclocal.m4"   && aclocal_m4="$localdir/aclocal.m4"
m4_common="-I $autoconf_dir -I $localdir -Dm4_tmpdir=$tmp"
m4_prefiles="                $autoconf_dir/autoconf.m4  $acsite_m4 $aclocal_m4"
m4f_prefiles="--reload-state=$autoconf_dir/autoconf.m4f $acsite_m4 $aclocal_m4"
run_m4="$M4 $m4_common"

# Find the input file.
case $# in
  0)
    case `ls configure.ac configure.in 2>/dev/null` in
      *ac*in )
        echo "$me: warning: both \`configure.ac' and \`configure.in' are present." >&2
        echo "$me: warning: proceeding with \`configure.ac'." >&2
        infile=configure.ac;;
      *ac ) infile=configure.ac;;
      *in ) infile=configure.in;;
      * )
        echo "$me: no input file" >&2
        exit 1;;
    esac
    test $task = script && test -z "$outfile" && outfile=configure;;
  1) infile=$1 ;;
  *) exec >&2
     echo "$me: invalid number of arguments."
     echo "$help"
     (exit 1); exit 1 ;;
esac

# Unless specified, the output is stdout.
test -z "$outfile" && outfile=-

# We need an actual file.
if test z$infile = z-; then
  infile=$tmp/stdin
  cat >$infile
elif test ! -r "$infile"; then
  echo "$me: $infile: No such file or directory" >&2
  (exit 1); exit 1
fi

# Output is produced into FD 4.  Prepare it.
case $outfile in
 -)  # Output to stdout
  exec 4>&1 ;;
 * )
  exec 4>$outfile;;
esac

# Initializations are performed.  Proceed to the main task.
case $task in

  ## --------------------------------- ##
  ## Generate the `configure' script.  ##
  ## --------------------------------- ##
  script)
  # M4 expansion.
  : >$tmp/forbidden.rx
  : >$tmp/allowed.rx
  $verbose "$me: running $run_m4 -Dm4_warnings=$m4_warnings $m4f_prefiles $infile" >&2
  $run_m4 -Dm4_warnings=$m4_warnings $m4f_prefiles $infile >$tmp/configure ||
    { (exit 1); exit 1; }

  if test "x$outfile" != x-; then
    chmod +x $outfile
  fi

  # Put the real line numbers into configure to make config.log more
  # helpful.  Because quoting can sometimes get really painful in m4,
  # there are special @tokens@ to substitute.
  sed 's/^    //' >"$tmp/finalize.awk" <<EOF
    # Load the list of tokens which escape the forbidden patterns.
    BEGIN {
      # Be sure the read GAWK documentation to understand the parens
      # around \`tmp "/forbidden.rx"'.
      while ((getline pattern < (tmp "/forbidden.rx")) > 0)
        forbidden = (forbidden ? forbidden "|" : "") pattern
      close (tmp "/forbidden.rx")
      if (verbose)
        errprint("$me: forbidden: " forbidden)

      while ((getline pattern < (tmp "/allowed.rx")) > 0)
        allowed = (allowed ? allowed "|" : "") pattern
      if (!allowed)
        allowed = "^$"
      close (tmp "/allowed.rx")
      if (verbose)
        errprint("$me: allowed: " allowed)
    }

    function errprint (message)
    {
      # BAD! the pipe to 'cat >&2' doesn't work for DJGPP.
      #  print message | "cat >&2"
      # Use normal redirection instead:
      print message > "$tmp/finalize.err"
    }

    function undefined (file, line, macro)
    {
      errprint(file ":" line ": error: possibly undefined macro: " macro)
    }

    # Body.
    {
      sub (/[ \t]*$/, "")
      if (\$0 == "")
        {
          if (!duplicate)
            {
               oline++
               print
            }
          duplicate = 1
          next
        }
      duplicate = 0
      oline++
      if (\$0 ~ /__oline__/)
        while (sub (/__oline__/, oline))
          continue
      while (sub (/@<:@/, "["))
        continue
      while (sub (/@:>@/, "]"))
        continue
      while (sub (/@S\|@/, "$"))
        continue
      while (sub (/@%:@/, "#"))
        continue

      print

      # Dubious feature: we tolerate macro names when commented.
      sub (/#.*/, "")

      # Get the tokens.
      split (\$0, tokens, /[^$WORDCHAR]*/)

      for (token in tokens)
        if (match (tokens[token], forbidden) &&
            !match (tokens[token], allowed))
          {
            macros [tokens [token]] = oline
            some_macros_were_not_expanded = 1
          }
    }

    # If there are some macros which are left unexpanded in the output,
    # try to find the input which is responsible.  Otherwise, try to help.
    END {
      if (some_macros_were_not_expanded)
        {
          line = 0
          while (getline < "$infile")
            {
              line++
              for (macro in macros)
                if (index (\$0, macro))
                  {
                    delete macros [macro]
                    undefined("$infile", line, macro)
                  }
            }
          close ("$infile")
          for (macro in macros)
            undefined("$outfile", macros [macro], macro)
          exit 1
        }
    }
EOF
    $AWK -v tmp="$tmp" \
         `$verbose "-v verbose=1"` \
         -f "$tmp/finalize.awk" <$tmp/configure >&4 ||
      { test -f "$tmp/finalize.err" && cat "$tmp/finalize.err" >&2
        (exit 1); exit 1; }
    test -f "$tmp/finalize.err" && cat "$tmp/finalize.err" >&2
  ;; # End of the task script.



  ## -------------- ##
  ## Trace macros.  ##
  ## -------------- ##
  trace)

  # trace.m4
  # --------
  # Routines to process formatted m4 traces.
  sed 's/^  //' >$tmp/trace.m4 <<\EOF
  divert(-1)
  changequote([, ])
  # _at_MODE(SEPARATOR, ELT1, ELT2...)
  # ----------------------------------
  # List the elements, separating then with SEPARATOR.
  # MODE can be:
  #  `at'       -- the elements are enclosed in brackets.
  #  `star'     -- the elements are listed as are.
  #  `percent'  -- the elements are `flattened': spaces are singled out,
  #                and no new line remains.
  define([_at_at],
         [at_ifelse([$#], [1], [],
                    [$#], [2], [[[$2]]],
                    [[[$2]][$1]$0([$1], at_shift(at_shift($@)))])])
  define([_at_percent],
         [at_ifelse([$#], [1], [],
                    [$#], [2], [at_flatten([$2])],
                    [at_flatten([$2])[$1]$0([$1], at_shift(at_shift($@)))])])
  define([_at_star],
         [at_ifelse([$#], [1], [],
                    [$#], [2], [[$2]],
                    [[$2][$1]$0([$1], at_shift(at_shift($@)))])])

  # FLATTEN quotes its result.
  define([at_flatten],
         [at_patsubst(at_patsubst(at_patsubst([[[$1]]],
                                              [\\
  ]),
                                  [[
     ]+],
                                  [ ]),
    		      [^ *\(.*\) *$], [[\1]])])

  define([at_args],    [at_shift(at_shift(at_shift(at_shift(at_shift($@)))))])
  define([at_at],      [_$0([$1], at_args($@))])
  define([at_percent], [_$0([$1], at_args($@))])
  define([at_star],    [_$0([$1], at_args($@))])

EOF

  # If you trace `define', then on `define([m4_exit], defn([m4exit])' you
  # will produce
  #
  #    AT_define([m4sugar.m4], [115], [1], [define], [m4_exit], <m4exit>)
  #
  # Since `<m4exit>' is not quoted, the outter m4, when processing
  # `trace.m4' will exit prematurely.  Hence, move all the builtins to
  # the `at_' name space.
  echo '# Copy the builtins.' >>$tmp/trace.m4
  echo "dumpdef" |
    $M4 2>&1 >/dev/null |
    sed 's/^\([^:]*\):.*/define([at_\1], defn([\1]))/' >>$tmp/trace.m4
  echo >>$tmp/trace.m4

  echo '# Disable the builtins.' >>$tmp/trace.m4
  echo "dumpdef" |
    $M4 2>&1 >/dev/null |
    sed 's/^\([^:]*\):.*/at_undefine([\1])/' >>$tmp/trace.m4
  echo >>$tmp/trace.m4


  # trace2m4.sed
  # ------------
  # Transform the traces from m4 into an m4 input file.
  # Typically, transform:
  #
  # | m4trace:configure.ac:3: -1- AC_SUBST([exec_prefix], [NONE])
  #
  # into
  #
  # | AT_AC_SUBST([configure.ac], [3], [1], [AC_SUBST], [exec_prefix], [NONE])
  #
  # Pay attention that the file name might include colons, if under DOS
  # for instance, so we don't use `[^:][^:]*'.
  # The first s/// catches multiline traces, the second, traces as above.
  preamble='m4trace:\(..*\):\([0-9][0-9]*\): -\([0-9][0-9]*\)-'
  cat >$tmp/trace2m4.sed <<EOF
  s/^$preamble \([^(][^(]*\)(\(.*\)$/AT_\4([\1], [\2], [\3], [\4], \5/
  s/^$preamble \(.*\)$/AT_\4([\1], [\2], [\3], [\4])/
EOF

  # translate.awk
  # -------------
  # Translate user tracing requests into m4 macros.
  cat >$tmp/translate.awk <<\EOF
  function trans (arg, sep)
  {
    # File name.
    if (arg == "f")
      return "$1"
    # Line number.
    if (arg == "l")
      return "$2"
    # Depth.
    if (arg == "d")
      return "$3"
    # Name (also available as $0).
    if (arg == "n")
      return "$4"
    # Escaped dollar.
    if (arg == "$")
      return "$"

    # $@, list of quoted effective arguments.
    if (arg == "@")
      return "]at_at([" (separator ? separator : ",") "], $@)["
    # $*, list of unquoted effective arguments.
    if (arg == "*")
      return "]at_star([" (separator ? separator : ",") "], $@)["
    # $%, list of flattened unquoted effective arguments.
    if (arg == "%")
      return "]at_percent([" (separator ? separator : ":") "], $@)["
  }

  function error (message)
  {
    print message | "cat >&2"
    exit 1
  }

  {
    # Accumulate the whole input.
    request = request $0 "\n"
  }

  END {
    # Chomp.
    request = substr (request, 1, length (request) - 1)
    # The default request is `$f:$l:$n:$*'.
    colon   = index (request, ":")
    macro   = colon ? substr (request, 1, colon - 1) : request
    request = colon ? substr (request, colon + 1)    : "$f:$l:$n:$%"

    res = ""

    for (cp = request; cp; cp = substr (cp, 2))
      {
  	char = substr (cp, 1, 1)
  	if (char == "$")
  	  {
  	    if (match (cp, /^\$[0-9]+/))
  	      {
  		# $n -> $(n + 4)
  		res = res "$" (substr (cp, 2, RLENGTH - 1) + 4)
  		cp = substr (cp, RLENGTH)
  	      }
  	    else if (substr (cp, 2, 1) ~ /[fldn$@%*]/)
  	      {
  		# $x, no separator given.
  		res = res trans(substr (cp, 2, 1))
  		cp = substr (cp, 2)
  	      }
  	    else if (substr (cp, 2, 1) == "{")
  	      {
  		# ${sep}x, long separator.
  		end = index (cp, "}")
  		if (!end)
  		  error("invalid escape: " cp)
  		separator = substr (cp, 3, end - 3)
  		if (substr (cp, end + 1, 1) ~ /[*@%]/)
  		  res = res trans(substr (cp, end + 1, 1), separator)
  		else
  		  error("invalid escape: " cp)
  		cp = substr (cp, end + 1)
  	      }
  	    else if (substr (cp, 3, 1) ~ /[*@%]/)
  	      {
  		# $sx, short separator `s'.
  		res = res trans(substr (cp, 3, 1), substr (cp, 2, 1))
  		cp = substr(cp, 3)
  	      }
  	    else
  	      {
  		error("invalid escape: " substr (cp, 1, 2))
  	      }
  	  }
  	else
  	  res = res char
      }

    # Produce the definition of AT_<MACRO> = the translation of the request.
    print "at_define([AT_" macro "],"
    print "[[" res "]])"
    print ""
    close("cat >&2")
  }
EOF


  # Extract both the m4 program and the m4 options from TRACES.
  echo "## ------------------------- ##" >>$tmp/trace.m4
  echo "## Trace processing macros.  ##" >>$tmp/trace.m4
  echo "## ------------------------- ##" >>$tmp/trace.m4
  echo >>$tmp/trace.m4

  eval set dummy "$traces"
  shift
  for trace
  do
    echo "# $trace" >>$tmp/trace.m4

    # The request may be several lines long, hence sed has to quit.
    macro_name=`echo "$trace" | sed 's/:.*//;q'`
    # If for instance TRACE is `define', be sure to have an empty
    # TRACE_FORMAT.
    case $trace in
      $macro_name:* )
         trace_format=`echo "$trace" | sed "1s/^$macro_name:/:/"`;;
      * )
         trace_format=;;
    esac

    # GNU M4 1.4's tracing of builtins is buggy.  When run on this input:
    #
    # | divert(-1)
    # | changequote([, ])
    # | define([m4_eval], defn([eval]))
    # | eval(1)
    # | m4_eval(2)
    # | undefine([eval])
    # | m4_eval(3)
    #
    # it behaves this way:
    #
    # | % m4 input.m4 -da -t eval
    # | m4trace: -1- eval(1)
    # | m4trace: -1- m4_eval(2)
    # | m4trace: -1- m4_eval(3)
    # | %
    #
    # Conversely:
    #
    # | % m4 input.m4 -da -t m4_eval
    # | %
    #
    # So we will merge them, i.e.  tracing `BUILTIN' or tracing
    # `m4_BUILTIN' will be the same: tracing both, but honoring the
    # *last* trace specification.
    # FIXME: This is not enough: in the output `$0' will be `BUILTIN'
    # sometimes and `m4_BUILTIN' at others.  We should render a unique name,
    # the one specified by the user.
    base_name=`echo "$macro_name" | sed 's/^m4_//'`
    if echo "ifdef(\`$base_name', \`', \`m4exit(-1)')" | $M4; then
      # BASE_NAME is a builtin.
      trace_opt="$trace_opt -t $base_name -t m4_$base_name"
      echo "$base_name$trace_format" |
        $AWK -f $tmp/translate.awk >>$tmp/trace.m4 ||
          { (exit 1); exit 1; }
      echo "m4_$base_name$trace_format" |
        $AWK -f $tmp/translate.awk >>$tmp/trace.m4 ||
          { (exit 1); exit 1; }
    else
      # MACRO_NAME is not a builtin.
      trace_opt="$trace_opt -t $macro_name"
      echo "$trace" |
        $AWK -f $tmp/translate.awk >>$tmp/trace.m4 ||
          { (exit 1); exit 1; }
    fi
    echo >>$tmp/trace.m4
  done

  echo "## ------------------- ##" >>$tmp/trace.m4
  echo "## Traces to process.  ##" >>$tmp/trace.m4
  echo "## ------------------- ##" >>$tmp/trace.m4
  echo >>$tmp/trace.m4
  echo "at_divert(0)at_dnl" >>$tmp/trace.m4

  # Do we trace the initialization?
  # `errprint' must be silent, otherwise there can be warnings mixed
  # with traces in m4's stderr.
  run_m4_trace="$run_m4 $trace_opt -daflq -Derrprint"
  if $initialization; then
    trace_prefiles="$m4_prefiles"
  else
    trace_prefiles="$m4f_prefiles"
  fi

  # Run m4 on the input file to get traces.
  #
  # We used to have a simple pipe, which was very convenient as it
  # allows to use traces on never ending expansions (i.e., when
  # debugging :) but it is requires to keep error messages *and*
  # traces in stderr.  This is too fragile, as it results in
  # unexpected data in the output.  autoheader has been fragile to
  # this.
  $verbose "$me: running $run_m4_trace $trace_prefiles $infile -o $tmp/traces" >&2
  $run_m4_trace $trace_prefiles $infile -o $tmp/traces >/dev/null ||
    {
      echo "$me: tracing failed" >&2
      (exit 1); exit 1
    }

  $verbose "$me: running $M4 $tmp/trace.m4" >&2
  sed -f $tmp/trace2m4.sed $tmp/traces |
    # Now we are ready to run m4 to process the trace file.
    if $debug; then
      cat >>$tmp/trace.m4
      $M4 $tmp/trace.m4
    else
      $M4 $tmp/trace.m4 -
    fi |
      # It makes no sense to try to transform __oline__.
      sed '
    	s/@<:@/[/g
    	s/@:>@/]/g
    	s/@S|@/$/g
    	s/@%:@/#/g
    	' >&4 ||
      {
    	echo "$me: traces formatting failed" >&2
    	(exit 1); exit 1
      }
  ;;


  ## ------------ ##
  ## Unknown task ##
  ## ------------ ##

  *) echo "$me: internal error: unknown task: $task" >&2
    (exit 1); exit 1
esac

(exit $status); exit $status
