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# autoupdate - modernize an Autoconf file.
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# Copyright (C) 1994, 1999, 2000, 2001, 2002, 2003
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# Copyright (C) 1994, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
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# Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# Originally written by David MacKenzie <djm@gnu.ai.mit.edu>.
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# Rewritten by Akim Demaille <akim@freefriends.org>.
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$version = "autoupdate (@PACKAGE_NAME@) @VERSION@
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Copyright (C) 2006 Free Software Foundation, Inc.
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This is free software. You may redistribute copies of it under the terms of
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the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
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There is NO WARRANTY, to the extent permitted by law.
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Written by David J. MacKenzie and Akim Demaille.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# &handle_m4_symbols ()
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# ---------------------
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# Create the following $tmp files:
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# m4.m4 -- enable the m4 builtins.
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# unm4.m4 -- disable the m4 builtins.
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# savem4.m4 -- save the m4 builtins.
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sub handle_m4_macros ()
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# ----------------- #
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# ----------------- #
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my (%ac_macros, %au_macros, %m4_builtins);
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# HANDLE_AUTOCONF_MACROS ()
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# -------------------------
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# @M4_BUILTINS -- M4 builtins and a useful comment.
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sub handle_autoconf_macros ()
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# Get the list of builtins.
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xsystem ("echo dumpdef | $m4 2>$tmp/m4.defs >/dev/null");
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my $m4_defs = new Autom4te::XFile "$tmp/m4.defs";
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while ($_ = $m4_defs->getline)
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push @m4_builtins, $1
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my $m4_m4 = new Autom4te::XFile ">$tmp/m4.m4";
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print $m4_m4 "# m4.m4 -- enable the m4 builtins.\n";
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my $unm4_m4 = new Autom4te::XFile ">$tmp/unm4.m4";
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print $unm4_m4 "# unm4.m4 -- disable the m4 builtins.\n";
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print $unm4_m4 "# Because Autoconf, via M4sugar, redefines some of these\n";
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print $unm4_m4 "# macros, and therefore since unac.m4 disables them,\n";
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print $unm4_m4 "# disable only if defined.\n";
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my $m4save_m4 = new Autom4te::XFile ">$tmp/m4save.m4";
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print $m4save_m4 "# savem4.m4 -- save the m4 builtins.\n";
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foreach (@m4_builtins)
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print $m4save_m4 "define([_au_$_], defn([$_]))\n";
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print $unm4_m4 "_au_ifdef([$_], [_au_undefine([$_])])\n";
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print $m4_m4 "_au_define([$_], _au_defn([_au_$_]))\n";
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# ----------------- #
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# ----------------- #
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# @AU_MACROS & AC_MACROS -- AU and AC macros and yet another useful comment.
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my (%ac_macros, %au_macros);
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# HANDLE_AUTOCONF_MACROS ()
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# -------------------------
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# @M4_BUILTINS -- M4 builtins and a useful comment.
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sub handle_autoconf_macros ()
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my $macros = new Autom4te::XFile ("$autoconf"
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. " --trace AU_DEFUN:'AU:\$f:\$1'"
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. " --trace AU_DEFINE:'AU:\$f:\$1'"
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. " --trace define:'AC:\$f:\$1'"
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. " --melt /dev/null |");
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while ($_ = $macros->getline)
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my ($domain, $file, $macro) = /^(AC|AU):(.*):([^:]*)$/ or next;
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# ../lib/m4sugar/m4sugar.m4 -> m4sugar
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# ../lib/autoconf/general.m4 -> autoconf
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# aclocal.m4 -> aclocal
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my $set = basename (dirname ($file));
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$set = 'aclocal' if $file eq 'aclocal.m4';
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error "unknown set: $set: $_"
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unless $set =~ /^(m4sugar|aclocal|autoconf)$/;
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$ac_macros{$macro} = $set;
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$au_macros{$macro} = 1;
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elsif ($file =~ /(^|\/)m4sugar\/(m4sugar|version)\.m4$/)
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# Add the m4sugar macros to m4_builtins.
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$m4_builtins{$macro} = 1;
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$au_macros{$macro} = $set;
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# Autoconf, aclocal, and m4sh macros.
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$ac_macros{$macro} = 1;
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# Don't keep AU macros in @AC_MACROS.
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delete $ac_macros{$_}
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foreach (keys %au_macros);
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# Don't keep M4sugar macros which are redefined by Autoconf,
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# such as `builtin', `changequote' etc. See autoconf/autoconf.m4.
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delete $ac_macros{$_}
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foreach (@m4_builtins);
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foreach (keys %m4_builtins);
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error "no current Autoconf macros found"
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unless keys %ac_macros;
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error "no obsolete Autoconf macros found"
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print $ac_m4 "# ac.m4 -- autoquoting definitions of the AC macros.\n";
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my $unac_m4 = new Autom4te::XFile ">$tmp/unac.m4";
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print $unac_m4 "# unac.m4 -- undefine the AC macros.\n";
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foreach (sort grep { $ac_macros{$_} ne 'm4sugar' } keys %ac_macros)
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print $ac_m4 "_au_define([$_], [[\$0(\$\@)]])\n";
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print $unac_m4 "_au_undefine([$_])\n";
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foreach (sort keys %ac_macros)
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print $ac_m4 "_au_m4_define([$_], [m4_if(\$#, 0, [[\$0]], [[\$0(\$\@)]])])\n";
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print $unac_m4 "_au_m4_undefine([$_])\n";
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# m4save.m4 -- save the m4 builtins.
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# unm4.m4 -- disable the m4 builtins.
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# m4.m4 -- enable the m4 builtins.
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my $m4save_m4 = new Autom4te::XFile ">$tmp/m4save.m4";
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print $m4save_m4 "# m4save.m4 -- save the m4 builtins.\n";
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my $unm4_m4 = new Autom4te::XFile ">$tmp/unm4.m4";
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print $unm4_m4 "# unm4.m4 -- disable the m4 builtins.\n";
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my $m4_m4 = new Autom4te::XFile ">$tmp/m4.m4";
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print $m4_m4 "# m4.m4 -- enable the m4 builtins.\n";
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foreach (sort keys %m4_builtins)
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print $m4save_m4 "_au__save([$_])\n";
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print $unm4_m4 "_au__undefine([$_])\n";
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print $m4_m4 "_au__restore([$_])\n";
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$autoconf .= join (' --prepend-include=', '', @prepend_include);
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handle_autoconf_macros;
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# $au_changequote -- enable the quote `[', `]' right before any AU macro.
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my $au_changequote =
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's/\b(' . join ('|', keys %au_macros) . ')\b/_au_changequote([,])$1/g';
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's/\b(' . join ('|', keys %au_macros) . ')\b/_au_m4_changequote([,])$1/g';
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# au.m4 -- definitions the AU macros.
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xsystem ("$autoconf --trace AU_DEFUN:'_au_defun(\@<:\@\$1\@:>\@,
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xsystem ("$autoconf --trace AU_DEFINE:'_au_defun(\@<:\@\$1\@:>\@,
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\@<:\@\$2\@:>\@)' --melt /dev/null "
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. ">$tmp/au.m4");
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my $input_m4 = <<\EOF;
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divert(-1) -*- Autoconf -*-
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# Define our special macros:
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define([_au__defn], defn([defn]))
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define([_au__divert], defn([divert]))
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define([_au__include], defn([include]))
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define([_au__undefine], defn([undefine]))
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define([_au__save], [m4_ifdef([$1], [m4_copy([$1], [_au_$1])])])
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define([_au__restore],
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[_au_m4_ifdef([_au_$1],
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[_au_m4_define([$1], _au__defn([_au_$1]))])])
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include(m4sugar/m4sugar.m4)
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# Redefine __file__ to make warnings nicer; $file is replaced below.
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m4_define([__file__], [$file])
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# Redefine m4_location to fix the line number.
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m4_define([m4_location], [__file__:m4_eval(__line__ - _au__first_line)])
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# Move all the builtins into the `_au_' pseudo namespace
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m4_include([m4save.m4])
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# _au_defun(NAME, BODY)
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# ---------------------
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# Define NAME to BODY, plus AU activation/deactivation.
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_au_define([_au_defun],
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_au_m4_define([_au_defun],
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_au_disable()])])
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# Import the definition of the obsolete macros.
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_au__include([au.m4])
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## ------------------------ ##
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# Reenable the builtins, and m4sugar.
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_au_define([__au_enable],
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# Reenable the builtins, m4sugar, and the autoquoting AC macros.
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_au_m4_define([__au_enable],
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# Enable special characters.
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# Enable the m4 builtins, m4sugar and the autoquoting AC macros.
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_au_include([m4sugar/m4sugar.m4])
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_au_m4_changecom([#])
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_au__include([m4.m4])
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_au__include([ac.m4])
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# Called at the beginning of all the obsolete macros. Reenable the
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# builtins, and m4sugar if needed.
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_au_define([_au_enable],
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[_au_ifdef([_au_enabled],
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# Called at the beginning of all the obsolete macros. If this is the
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# outermost level, call __au_enable.
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_au_m4_define([_au_enable],
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[_au_m4_ifdef([_au_enabled],
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[__au_enable()])_au_dnl
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_au_pushdef([_au_enabled])])
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_au_m4_pushdef([_au_enabled])])
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# Disable the builtins, and m4sugar.
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_au_define([__au_disable],
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# Disable m4sugar, the AC autoquoting macros, and m4.
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_au_include([unac.m4])
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_au_include([unm4.m4])
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# Disable the AC autoquoting macros, m4sugar, and m4.
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_au_m4_define([__au_disable],
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_au__include([unac.m4])
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_au__include([unm4.m4])
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# Disable special characters.
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# Called at the end of all the obsolete macros. Disable the
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# builtins, and m4sugar if needed..
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_au_define([_au_disable],
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[_au_popdef([_au_enabled])_au_dnl
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_au_ifdef([_au_enabled],
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# Called at the end of all the obsolete macros. If we are at the
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# outermost level, call __au_disable.
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_au_m4_define([_au_disable],
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[_au_m4_popdef([_au_enabled])_au_dnl
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_au_m4_ifdef([_au_enabled],
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[__au_disable()])])
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## ------------------------------- ##
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## Disable, and process the file. ##
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## ------------------------------- ##
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# Disable m4: M4sugar and the AC autoquoting macros are not loaded yet,
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# hence invoking `_au_disable' is wrong.
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_au_include([unm4.m4])
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# Disable special characters.
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# The AC autoquoting macros are not loaded yet, hence invoking
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# `_au_disable' would be wrong.
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_au__include([unm4.m4])
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# Disable special characters, and set the first line number.
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_au_m4_define(_au__first_line, _au___line__)_au__divert(0)_au_dnl
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$input_m4 =~ s/^ //mg;
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$input_m4 =~ s/\$file/$file/g;
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# prepared input -- input, but reenables the quote before each AU macro.
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open INPUT_M4, ">$tmp/input.m4"
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# No big deal for the semantics (unless the macro depends upon $#, which
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# is bad), but the users would not be happy.
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# Additionally, we introduced quotes that we not there before, which is
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# Additionally, we introduced quotes that were not there before, which is
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# OK in most cases, but could change the semantics of the file.
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# Cruel dilemma: we do want the auto-quoting definition of `NEW' when
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removed
bin/autoupdate.in
