autoreconf.in

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	  if (/^ACLOCAL_[A-Z_]*FLAGS\s*=\s*(.*)/)
	    {
	      $aclocal_flags = $1;
	      last;
	    }
	}
    }

  if (!$uses_aclocal)
    {
      verbose "$configure_ac: not using aclocal";
    }
  else
    {
      # Some filesystems have sub-second time stamps, and if so we may
      # run into trouble later, after we rerun autoconf and set the
      # time stamps of input files to be no greater than aclocal.m4,
      # because the time-stamp-setting operation (utime) has a
      # resolution of only 1 second.  Work around the problem by
      # ensuring that there is at least a one-second window before the
      # time stamp of aclocal.m4t in which no file time stamps can
      # fall.
      sleep 1;

      xsystem ("$aclocal $aclocal_flags --output=aclocal.m4t");
      # aclocal may produce no output.
      update_file ('aclocal.m4t', 'aclocal.m4')
	if -f 'aclocal.m4t';
    }

  # We might have to rerun aclocal if Libtool (or others) imports new
  # macros.
  my $rerun_aclocal = 0;



  # ------------------------------- #
  # See what tools will be needed.  #
  # ------------------------------- #

  # Perform a single trace reading to avoid --force forcing a rerun
  # between two --trace, that's useless.  If there is no AC_INIT, then
  # we are not interested: it looks like a Cygnus thingy.
  my $uses_gettext_via_traces;
  my $uses_libtool;
  my $uses_autoheader;
  my @subdir;
  verbose "$configure_ac: tracing";
  my $traces = new Autom4te::XFile
    ("$autoconf"
     . join (' --trace=', '',
	     # If you change this list, update the
	     # `Autoreconf-preselections' section of autom4te.in.
	     'AC_CONFIG_HEADERS',
	     'AC_CONFIG_SUBDIRS:AC_CONFIG_SUBDIRS:\$1',
	     'AC_INIT',
	     'AC_PROG_LIBTOOL',
	     'AM_GNU_GETTEXT',
	    )
     . ' |');
  while ($_ = $traces->getline)
    {
      $uses_autoconf = 1            if /AC_INIT/;
      $uses_gettext_via_traces = 1  if /AM_GNU_GETTEXT/;
      $uses_libtool = 1             if /AC_PROG_LIBTOOL/;
      $uses_autoheader = 1          if /AC_CONFIG_HEADERS/;
      push @subdir, split (' ', $1) if /AC_CONFIG_SUBDIRS:(.*)/;
    }

  # The subdirs are *optional*, they may not exist.
  foreach (@subdir)
    {
      if (-d)
	{
	  verbose "$configure_ac: subdirectory $_ to autoreconf";
	  autoreconf ($_);
	}
      else
	{
	  verbose "$configure_ac: subdirectory $_ not present";
	}
    }

  # Gettext consistency checks...
  error "$configure_ac: AM_GNU_GETTEXT is used, but not AM_GNU_GETTEXT_VERSION"
    if $uses_gettext_via_traces && ! $uses_gettext;
  error "$configure_ac: AM_GNU_GETTEXT_VERSION is used, but not AM_GNU_GETTEXT"
    if $uses_gettext && ! $uses_gettext_via_traces;


  # -------------------- #
  # Running libtoolize.  #
  # -------------------- #

  if (!$uses_libtool)
    {
      verbose "$configure_ac: not using Libtool";
    }
  elsif ($install)
    {
      xsystem ($libtoolize);
      $rerun_aclocal = 1;
    }
  else
    {
      verbose "$configure_ac: not running libtoolize: --install not given";
    }



  # ------------------- #
  # Rerunning aclocal.  #
  # ------------------- #

  # If we re-installed Libtool or Gettext, the macros might have changed.
  # Automake also needs an up-to-date aclocal.m4.
  if ($rerun_aclocal)
    {
      if (!$uses_aclocal)
	{
	  verbose "$configure_ac: not using aclocal";
	}
      else
	{
	  xsystem ("$aclocal $aclocal_flags --output=aclocal.m4t");
	  # aclocal may produce no output.
	  if (-f 'aclocal.m4t')
	    {
	      update_file ('aclocal.m4t', 'aclocal.m4');
	      # Make sure that the local m4 files are older than
	      # aclocal.m4.
	      #
	      # Why is not always the case?  Because we already run
	      # aclocal at first (before tracing), which, for instance,
	      # can find Gettext's macros in .../share/aclocal, so we
	      # may have had the right aclocal.m4 already.  Then
	      # autopoint is run, and installs locally these M4
	      # files.  Then autoreconf, via update_file, sees it is
	      # the _same_ aclocal.m4, and doesn't change its
	      # timestamp.  But later, Automake's Makefile expresses
	      # that aclocal.m4 depends on these local files, which
	      # are newer, so it triggers aclocal again.
	      #
	      # To make sure aclocal.m4 is no older, we change the
	      # modification times of the local M4 files to be
	      # not newer than it.
	      #
	      # First, where are the local files?
	      my $aclocal_local_dir = '.';
	      if ($aclocal_flags =~ /-I\s+(\S+)/)
		{
		  $aclocal_local_dir = $1;
		}
	      # All the local files newer than aclocal.m4 are to be
	      # made not newer than it.
	      my $aclocal_m4_mtime = mtime ('aclocal.m4');
	      for my $file (glob ("$aclocal_local_dir/*.m4"), 'acinclude.m4')
		{
		  if ($aclocal_m4_mtime < mtime ($file))
		    {
		      debug "aging $file to be not newer than aclocal.m4";
		      utime $aclocal_m4_mtime, $aclocal_m4_mtime, $file;
		    }
		}
	    }
	}
    }


  # ------------------ #
  # Running autoconf.  #
  # ------------------ #

  # Don't try to be smarter than `autoconf', which does its own up to
  # date checks.
  #
  # We prefer running autoconf before autoheader, because (i) the
  # latter runs the former, and (ii) autoconf is stricter than
  # autoheader.  So all in all, autoconf should give better error
  # messages.
  xsystem ($autoconf);


  # -------------------- #
  # Running autoheader.  #
  # -------------------- #

  # We now consider that if AC_CONFIG_HEADERS is used, then autoheader
  # is used too.
  #
  # Just as for autoconf, up to date ness is performed by the tool
  # itself.
  #
  # Run it before automake, since the latter checks the presence of
  # config.h.in when it sees an AC_CONFIG_HEADERS.
  if (!$uses_autoheader)
    {
      verbose "$configure_ac: not using Autoheader";
    }
  else
    {
      xsystem ($autoheader);
    }


  # ------------------ #
  # Running automake.  #
  # ------------------ #

  # Assumes that there is a Makefile.am in the topmost directory.
  if (!-f 'Makefile.am')
    {
      verbose "$configure_ac: not using Automake";
    }
  else
    {
      # We should always run automake, and let it decide whether it shall
      # update the file or not.  In fact, the effect of `$force' is already
      # included in `$automake' via `--no-force'.
      xsystem ($automake);
    }


  # -------------- #
  # Running make.  #
  # -------------- #

  if ($make)
    {
      if (!-f "config.status")
	{
	  verbose "no config.status: cannot re-make";
	}
      else
	{
	  xsystem ("./config.status --recheck");
	  xsystem ("./config.status");
	  if (!-f "Makefile")
	    {
	      verbose "no Makefile: cannot re-make";
	    }
	  else
	    {
	      xsystem ("make");
	    }
	}
    }
}


# &autoreconf ($DIRECTORY)
# ------------------------
# Reconf the $DIRECTORY.
sub autoreconf ($)
{
  my ($directory) = @_;
  my $cwd = cwd;

  # The format for this message is not free: taken from Emacs, itself
  # using GNU Make's format.
  verbose "Entering directory `$directory'";
  chdir $directory
    or error "cannot chdir to $directory: $!";

  autoreconf_current_directory;

  # The format is not free: taken from Emacs, itself using GNU Make's
  # format.
  verbose "Leaving directory `$directory'";
  chdir $cwd
    or error "cannot chdir to $cwd: $!";
}


## ------ ##
## Main.  ##
## ------ ##

# When debugging, it is convenient that all the related temporary
# files be at the same place.
mktmpdir ('ar');
$ENV{'TMPDIR'} = $tmp;
parse_args;

# Autoreconf all the given configure.ac.  A while loop, not a for,
# since the list can change at runtime because of AC_CONFIG_SUBDIRS.
for my $directory (@ARGV)
  {
    autoreconf ($directory);
  }

### Setup "GNU" style for perl-mode and cperl-mode.
## Local Variables:
## perl-indent-level: 2
## perl-continued-statement-offset: 2
## perl-continued-brace-offset: 0
## perl-brace-offset: 0
## perl-brace-imaginary-offset: 0
## perl-label-offset: -2
## cperl-indent-level: 2
## cperl-brace-offset: 0
## cperl-continued-brace-offset: 0
## cperl-label-offset: -2
## cperl-extra-newline-before-brace: t
## cperl-merge-trailing-else: nil
## cperl-continued-statement-offset: 2
## End: