5 eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
8 # aclocal - create aclocal.m4 by scanning configure.ac
10 # Copyright (C) 1996-2012 Free Software Foundation, Inc.
12 # This program is free software; you can redistribute it and/or modify
13 # it under the terms of the GNU General Public License as published by
14 # the Free Software Foundation; either version 2, or (at your option)
17 # This program is distributed in the hope that it will be useful,
18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 # GNU General Public License for more details.
22 # You should have received a copy of the GNU General Public License
23 # along with this program. If not, see <http://www.gnu.org/licenses/>.
25 # Written by Tom Tromey <tromey@redhat.com>, and
26 # Alexandre Duret-Lutz <adl@gnu.org>.
30 my $perllibdir = $ENV{'perllibdir'} || '@datadir@/@PACKAGE@-@APIVERSION@';
31 unshift @INC, (split '@PATH_SEPARATOR@', $perllibdir);
37 use Automake::General;
38 use Automake::Configure_ac;
39 use Automake::Channels;
40 use Automake::ChannelDefs;
42 use Automake::FileUtils;
48 # We do not operate in threaded mode.
51 # Include paths for searching macros. We search macros in this order:
52 # user-supplied directories first, then the directory containing the
53 # automake macros, and finally the system-wide directories for
55 # @user_includes can be augmented with -I or AC_CONFIG_MACRO_DIRS.
56 # @automake_includes can be reset with the '--automake-acdir' option.
57 # @system_includes can be augmented with the 'dirlist' file or the
58 # ACLOCAL_PATH environment variable, and reset with the '--system-acdir'
60 my @user_includes = ();
61 my @automake_includes = ("@datadir@/aclocal-$APIVERSION");
62 my @system_includes = ('@datadir@/aclocal');
64 # Whether we should copy M4 file in $user_includes[0].
73 # configure.ac or configure.in.
77 my $output_file = 'aclocal.m4';
82 # Modification time of the youngest dependency.
83 my $greatest_mtime = 0;
85 # Which macros have been seen.
88 # Remember the order into which we scanned the files.
89 # It's important to output the contents of aclocal.m4 in the opposite order.
90 # (Definitions in first files we have scanned should override those from
91 # later files. So they must appear last in the output.)
94 # Map macro names to file names.
97 # Ditto, but records the last definition of each macro as returned by --trace.
98 my %map_traced_defs = ();
100 # Map basenames to macro names.
103 # Map file names to file contents.
104 my %file_contents = ();
106 # Map file names to file types.
108 use constant FT_USER => 1;
109 use constant FT_AUTOMAKE => 2;
110 use constant FT_SYSTEM => 3;
112 # Map file names to included files (transitively closed).
113 my %file_includes = ();
115 # Files which have already been added.
118 # Files that have already been scanned.
119 my %scanned_configure_dep = ();
121 # Serial numbers, for files that have one.
122 # The key is the basename of the file,
123 # the value is the serial number represented as a list.
126 # Matches a macro definition.
127 # AC_DEFUN([macroname], ...)
129 # AC_DEFUN(macroname, ...)
130 # When macroname is '['-quoted , we accept any character in the name,
131 # except ']'. Otherwise macroname stops on the first ']', ',', ')',
132 # or '\n' encountered.
134 "(?:AU_ALIAS|A[CU]_DEFUN|AC_DEFUN_ONCE)\\((?:\\[([^]]+)\\]|([^],)\n]+))";
136 # Matches an AC_REQUIRE line.
137 my $ac_require_rx = "AC_REQUIRE\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
139 # Matches an m4_include line.
140 my $m4_include_rx = "(m4_|m4_s|s)include\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
142 # Match a serial number.
143 my $serial_line_rx = '^#\s*serial\s+(\S*)';
144 my $serial_number_rx = '^\d+(?:\.\d+)*$';
146 # Autoconf version. This variable is set by 'trace_used_macros'.
149 # User directory containing extra m4 files for macros definition,
150 # as extracted from calls to the macro AC_CONFIG_MACRO_DIRS.
151 # This variable is updated by 'trace_used_macros'.
152 my @ac_config_macro_dirs;
154 # If set, names a temporary file that must be erased on abnormal exit.
157 ################################################################
159 # Prototypes for all subroutines.
163 sub check_acinclude ();
165 sub install_file ($$);
166 sub list_compare (\@\@);
167 sub scan_m4_dirs ($$@);
168 sub scan_m4_files ();
170 sub scan_configure_dep ($);
173 sub strip_redundant_includes (%);
174 sub trace_used_macros ();
175 sub scan_configure ();
176 sub write_aclocal ($@);
179 sub handle_acdir_option ($$);
180 sub parse_arguments ();
181 sub parse_ACLOCAL_PATH ();
183 ################################################################
185 # Erase temporary file ERASE_ME. Handle signals.
192 verb "caught SIG$sig, bailing out";
194 if (defined $erase_me && -e $erase_me && !unlink ($erase_me))
196 fatal "could not remove '$erase_me': $!";
200 # reraise default handler.
203 $SIG{$sig} = 'DEFAULT';
208 $SIG{'INT'} = $SIG{'TERM'} = $SIG{'QUIT'} = $SIG{'HUP'} = 'unlink_tmp';
216 if -d $dir or eval { File::Path::mkpath $dir };
218 $@ =~ s/\s+at\s.*\bline\s\d+.*$//;
219 fatal "could not create directory '$dir': $@";
222 # Check macros in acinclude.m4. If one is not used, warn.
223 sub check_acinclude ()
225 foreach my $key (keys %map)
227 # FIXME: should print line number of acinclude.m4.
228 msg ('syntax', "macro '$key' defined in acinclude.m4 but never used")
229 if $map{$key} eq 'acinclude.m4' && ! exists $macro_seen{$key};
239 %map_traced_defs = ();
244 %scanned_configure_dep = ();
250 # install_file ($SRC, $DESTDIR)
251 sub install_file ($$)
253 my ($src, $destdir) = @_;
254 my $dest = $destdir . "/" . basename ($src);
257 verb "installing $src to $dest";
260 || !exists $file_contents{$dest}
261 || $file_contents{$src} ne $file_contents{$dest})
265 msg 'note', "overwriting '$dest' with '$src'";
270 msg 'note', "installing '$dest' from '$src'";
275 if (! defined $diff_dest)
277 # $dest does not exist. We create an empty one just to
278 # run diff, and we erase it afterward. Using the real
279 # the destination file (rather than a temporary file) is
280 # good when diff is run with options that display the
283 # If creating $dest fails, fall back to /dev/null. At
284 # least one diff implementation (Tru64's) cannot deal
285 # with /dev/null. However working around this is not
286 # worth the trouble since nobody run aclocal on a
287 # read-only tree anyway.
289 my $f = new IO::File "> $dest";
293 $diff_dest = '/dev/null';
301 my @cmd = (@diff_command, $diff_dest, $src);
303 verb "running: @cmd";
304 my $res = system (@cmd);
305 Automake::FileUtils::handle_exec_errors "@cmd", 1
312 xsystem ('cp', $src, $dest);
317 # Compare two lists of numbers.
318 sub list_compare (\@\@)
326 return (0 == @r) ? 0 : -1;
332 elsif ($l[0] < $r[0])
336 elsif ($l[0] > $r[0])
345 ################################################################
347 # scan_m4_dirs($TYPE, $ERR_ON_NONEXISTING, @DIRS)
348 # -----------------------------------------------
349 # Scan all M4 files installed in @DIRS for new macro definitions.
350 # Register each file as of type $TYPE (one of the FT_* constants).
351 sub scan_m4_dirs ($$@)
353 my ($type, $err_on_nonexisting, @dirlist) = @_;
355 foreach my $m4dir (@dirlist)
357 if (! opendir (DIR, $m4dir))
359 # TODO: maybe avoid complaining only if errno == ENONENT?
360 next unless $err_on_nonexisting;
361 fatal "couldn't open directory '$m4dir': $!";
364 # We reverse the directory contents so that foo2.m4 gets
365 # used in preference to foo1.m4.
366 foreach my $file (reverse sort grep (! /^\./, readdir (DIR)))
368 # Only examine .m4 files.
369 next unless $file =~ /\.m4$/;
371 # Skip some files when running out of srcdir.
372 next if $file eq 'aclocal.m4';
374 my $fullfile = File::Spec->canonpath ("$m4dir/$file");
375 scan_file ($type, $fullfile, 'aclocal');
381 # Scan all the installed m4 files and construct a map.
384 # First, scan configure.ac. It may contain macro definitions,
385 # or may include other files that define macros.
386 scan_file (FT_USER, $configure_ac, 'aclocal');
388 # Then, scan acinclude.m4 if it exists.
389 if (-f 'acinclude.m4')
391 scan_file (FT_USER, 'acinclude.m4', 'aclocal');
394 # Finally, scan all files in our search paths.
398 # Don't complain if the first user directory doesn't exist, in case
399 # we need to create it later (can happen if '--install' was given).
400 scan_m4_dirs (FT_USER, !$install, $user_includes[0]);
401 scan_m4_dirs (FT_USER, 1, @user_includes[1..$#user_includes]);
403 scan_m4_dirs (FT_AUTOMAKE, 1, @automake_includes);
404 scan_m4_dirs (FT_SYSTEM, 1, @system_includes);
406 # Construct a new function that does the searching. We use a
407 # function (instead of just evaluating $search in the loop) so that
408 # "die" is correctly and easily propagated if run.
409 my $search = "sub search {\nmy \$found = 0;\n";
410 foreach my $key (reverse sort keys %map)
412 $search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { add_macro ("' . $key
413 . '"); $found = 1; }' . "\n");
415 $search .= "return \$found;\n};\n";
417 prog_error "$@\n search is $search" if $@;
420 ################################################################
422 # Add a macro to the output.
427 # Ignore unknown required macros. Either they are not really
428 # needed (e.g., a conditional AC_REQUIRE), in which case aclocal
429 # should be quiet, or they are needed and Autoconf itself will
430 # complain when we trace for macro usage later.
431 return unless defined $map{$macro};
433 verb "saw macro $macro";
434 $macro_seen{$macro} = 1;
435 add_file ($map{$macro});
438 # scan_configure_dep ($file)
439 # --------------------------
440 # Scan a configure dependency (configure.ac, or separate m4 files)
441 # for uses of known macros and AC_REQUIREs of possibly unknown macros.
442 # Recursively scan m4_included files.
443 sub scan_configure_dep ($)
446 # Do not scan a file twice.
448 if exists $scanned_configure_dep{$file};
449 $scanned_configure_dep{$file} = 1;
451 my $mtime = mtime $file;
452 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
454 my $contents = exists $file_contents{$file} ?
455 $file_contents{$file} : contents $file;
460 foreach (split ("\n", $contents))
463 # Remove comments from current line.
466 # Avoid running all the following regexes on white lines.
469 while (/$m4_include_rx/go)
471 my $ifile = $2 || $3;
472 # Skip missing 'sinclude'd files.
473 next if $1 ne 'm4_' && ! -f $ifile;
477 while (/$ac_require_rx/go)
479 push (@rlist, $1 || $2);
482 # The search function is constructed dynamically by
483 # scan_m4_files. The last parenthetical match makes sure we
484 # don't match things that look like macro assignments or
486 if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
488 # Macro not found, but AM_ prefix found.
489 # Make this just a warning, because we do not know whether
490 # the macro is actually used (it could be called conditionally).
491 msg ('unsupported', "$file:$line",
492 "macro '$2' not found in library");
496 add_macro ($_) foreach (@rlist);
497 scan_configure_dep ($_) foreach @ilist;
502 # Add $FILE to output.
507 # Only add a file once.
508 return if ($file_added{$file});
509 $file_added{$file} = 1;
511 scan_configure_dep $file;
514 # Point to the documentation for underquoted AC_DEFUN only once.
515 my $underquoted_manual_once = 0;
517 # scan_file ($TYPE, $FILE, $WHERE)
518 # --------------------------------
519 # Scan a single M4 file ($FILE), and all files it includes.
520 # Return the list of included files.
521 # $TYPE is one of FT_USER, FT_AUTOMAKE, or FT_SYSTEM, depending
522 # on where the file comes from.
523 # $WHERE is the location to use in the diagnostic if the file
527 my ($type, $file, $where) = @_;
528 my $basename = basename $file;
530 # Do not scan the same file twice.
531 return @{$file_includes{$file}} if exists $file_includes{$file};
532 # Prevent potential infinite recursion (if two files include each other).
533 return () if exists $file_contents{$file};
535 unshift @file_order, $file;
537 $file_type{$file} = $type;
539 fatal "$where: file '$file' does not exist" if ! -e $file;
541 my $fh = new Automake::XFile $file;
548 my $serial_older = 0;
550 while ($_ = $fh->getline)
558 if ($line =~ /$serial_line_rx/go)
561 if ($number !~ /$serial_number_rx/go)
563 msg ('syntax', "$file:$.",
564 "ill-formed serial number '$number', "
565 . "expecting a version string with only digits and dots");
569 # aclocal removes all definitions from M4 file with the
570 # same basename if a greater serial number is found.
571 # Encountering a serial after some macros will undefine
573 msg ('syntax', "$file:$.",
574 'the serial number must appear before any macro definition');
576 # We really care about serials only for non-automake macros
577 # and when --install is used. But the above diagnostics are
578 # made regardless of this, because not using --install is
579 # not a reason not the fix macro files.
580 elsif ($install && $type != FT_AUTOMAKE)
583 my @new = split (/\./, $number);
585 verb "$file:$.: serial $number";
587 if (!exists $serial{$basename}
588 || list_compare (@new, @{$serial{$basename}}) > 0)
590 # Delete any definition we knew from the old macro.
591 foreach my $def (@{$invmap{$basename}})
593 verb "$file:$.: ignoring previous definition of $def";
596 $invmap{$basename} = [];
597 $serial{$basename} = \@new;
606 # Remove comments from current line.
607 # Do not do it earlier, because the serial line is a comment.
608 $line =~ s/\bdnl\b.*$//;
611 while ($line =~ /$ac_defun_rx/go)
616 msg ('syntax', "$file:$.", "underquoted definition of $2"
617 . "\n run info Automake 'Extending aclocal'\n"
618 . " or see http://www.gnu.org/software/automake/manual/"
619 . "automake.html#Extending-aclocal")
620 unless $underquoted_manual_once;
621 $underquoted_manual_once = 1;
624 # If this macro does not have a serial and we have already
625 # seen a macro with the same basename earlier, we should
626 # ignore the macro (don't exit immediately so we can still
627 # diagnose later #serial numbers and underquoted macros).
628 $serial_older ||= ($type != FT_AUTOMAKE
629 && !$serial_seen && exists $serial{$basename});
631 my $macro = $1 || $2;
632 if (!$serial_older && !defined $map{$macro})
634 verb "found macro $macro in $file: $.";
635 $map{$macro} = $file;
636 push @{$invmap{$basename}}, $macro;
640 # Note: we used to give an error here if we saw a
641 # duplicated macro. However, this turns out to be
642 # extremely unpopular. It causes actual problems which
643 # are hard to work around, especially when you must
644 # mix-and-match tool versions.
645 verb "ignoring macro $macro in $file: $.";
649 while ($line =~ /$m4_include_rx/go)
651 my $ifile = $2 || $3;
652 # Skip missing 'sinclude'd files.
653 next if $1 ne 'm4_' && ! -f $ifile;
654 push (@inc_files, $ifile);
655 $inc_lines{$ifile} = $.;
659 # Ignore any file that has an old serial (or no serial if we know
660 # another one with a serial).
663 ($type != FT_AUTOMAKE && !$serial_seen && exists $serial{$basename}));
665 $file_contents{$file} = $contents;
667 # For some reason I don't understand, it does not work
668 # to do "map { scan_file ($_, ...) } @inc_files" below.
669 # With Perl 5.8.2 it undefines @inc_files.
670 my @copy = @inc_files;
671 my @all_inc_files = (@inc_files,
672 map { scan_file ($type, $_,
673 "$file:$inc_lines{$_}") } @copy);
674 $file_includes{$file} = \@all_inc_files;
675 return @all_inc_files;
678 # strip_redundant_includes (%FILES)
679 # ---------------------------------
680 # Each key in %FILES is a file that must be present in the output.
681 # However some of these files might already include other files in %FILES,
682 # so there is no point in including them another time.
683 # This removes items of %FILES which are already included by another file.
684 sub strip_redundant_includes (%)
688 # Always include acinclude.m4, even if it does not appear to be used.
689 $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
690 # File included by $configure_ac are redundant.
691 $files{$configure_ac} = 1;
693 # Files at the end of @file_order should override those at the beginning,
694 # so it is important to preserve these trailing files. We can remove
695 # a file A if it is going to be output before a file B that includes
696 # file A, not the converse.
697 foreach my $file (reverse @file_order)
699 next unless exists $files{$file};
700 foreach my $ifile (@{$file_includes{$file}})
702 next unless exists $files{$ifile};
703 delete $files{$ifile};
704 verb "$ifile is already included by $file";
708 # configure.ac is implicitly included.
709 delete $files{$configure_ac};
714 sub trace_used_macros ()
716 my %files = map { $map{$_} => 1 } keys %macro_seen;
717 %files = strip_redundant_includes %files;
719 my $traces = ($ENV{AUTOM4TE} || '@am_AUTOM4TE@');
720 $traces .= " --language Autoconf-without-aclocal-m4 ";
721 # When AC_CONFIG_MACRO_DIRS is used, avoid possible spurious warnings
722 # from autom4te about macros being "m4_require'd but not m4_defun'd";
723 # for more background, see:
724 # http://lists.gnu.org/archive/html/autoconf-patches/2012-11/msg00004.html
725 # as well as autoconf commit 'v2.69-44-g1ed0548', "warn: allow aclocal
726 # to silence m4_require warnings".
727 $traces = "echo 'm4_define([m4_require_silent_probe], [-])' | " .
729 # All candidate files.
730 $traces .= join (' ',
732 (grep { exists $files{$_} } @file_order))) . " ";
734 # All candidate macros.
735 $traces .= join (' ',
736 (map { "--trace='$_:\$f::\$n::\${::}%'" }
740 '_AM_AUTOCONF_VERSION',
741 'AC_CONFIG_MACRO_DIR',
742 'AC_CONFIG_MACRO_DIRS')),
743 # Do not trace $1 for all other macros as we do
744 # not need it and it might contains harmful
745 # characters (like newlines).
746 (map { "--trace='$_:\$f::\$n'" } (keys %macro_seen)));
748 verb "running $traces $configure_ac";
750 my $tracefh = new Automake::XFile ("$traces $configure_ac |");
752 @ac_config_macro_dirs = ();
756 while ($_ = $tracefh->getline)
759 my ($file, $macro, $arg1) = split (/::/);
761 $traced{$macro} = 1 if exists $macro_seen{$macro};
763 if ($macro eq 'AC_DEFUN' || $macro eq 'AC_DEFUN_ONCE'
764 || $macro eq 'AU_DEFUN')
766 $map_traced_defs{$arg1} = $file;
768 elsif ($macro eq '_AM_AUTOCONF_VERSION')
772 elsif ($macro eq 'AC_CONFIG_MACRO_DIR')
774 @ac_config_macro_dirs = ($arg1);
776 elsif ($macro eq 'AC_CONFIG_MACRO_DIRS')
778 # Empty leading/trailing fields might be produced by split,
779 # hence the grep is really needed.
780 push @ac_config_macro_dirs, grep (/./, (split /\s+/, $arg1));
789 sub scan_configure ()
791 # Make sure we include acinclude.m4 if it exists.
792 if (-f 'acinclude.m4')
794 add_file ('acinclude.m4');
796 scan_configure_dep ($configure_ac);
799 ################################################################
802 # Return 0 iff some files were installed locally.
803 sub write_aclocal ($@)
805 my ($output_file, @macros) = @_;
809 # Get the list of files containing definitions for the macros used.
810 # (Filter out unused macro definitions with $map_traced_defs. This
811 # can happen when an Autoconf macro is conditionally defined:
812 # aclocal sees the potential definition, but this definition is
813 # actually never processed and the Autoconf implementation is used
818 if (exists $map_traced_defs{$m}
819 && $map{$m} eq $map_traced_defs{$m});
821 # Do not explicitly include a file that is already indirectly included.
822 %files = strip_redundant_includes %files;
826 for my $file (grep { exists $files{$_} } @file_order)
828 # Check the time stamp of this file, and of all files it includes.
829 for my $ifile ($file, @{$file_includes{$file}})
831 my $mtime = mtime $ifile;
832 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
835 # If the file to add looks like outside the project, copy it
836 # to the output. The regex catches filenames starting with
837 # things like '/', '\', or 'c:\'.
838 if ($file_type{$file} != FT_USER
839 || $file =~ m,^(?:\w:)?[\\/],)
841 if (!$install || $file_type{$file} != FT_SYSTEM)
843 # Copy the file into aclocal.m4.
844 $output .= $file_contents{$file} . "\n";
848 # Install the file (and any file it includes).
850 for my $ifile (@{$file_includes{$file}}, $file)
852 install_file ($ifile, $user_includes[0]);
859 # Otherwise, simply include the file.
860 $output .= "m4_include([$file])\n";
866 verb "running aclocal anew, because some files were installed locally";
870 # Nothing to output?!
871 # FIXME: Shouldn't we diagnose this?
872 return 1 if ! length ($output);
876 # Do not use "$output_file" here for the same reason we do not
877 # use it in the header below. autom4te will output the name of
878 # the file in the diagnostic anyway.
879 $output = "m4_ifndef([AC_AUTOCONF_VERSION],
880 [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
881 m4_if(m4_defn([AC_AUTOCONF_VERSION]), [$ac_version],,
882 [m4_warning([this file was generated for autoconf $ac_version.
883 You have another version of autoconf. It may work, but is not guaranteed to.
884 If you have problems, you may need to regenerate the build system entirely.
885 To do so, use the procedure documented by the package, typically 'autoreconf'.])])
890 # We used to print "# $output_file generated automatically etc." But
891 # this creates spurious differences when using autoreconf. Autoreconf
892 # creates aclocal.m4t and then rename it to aclocal.m4, but the
893 # rebuild rules generated by Automake create aclocal.m4 directly --
894 # this would gives two ways to get the same file, with a different
895 # name in the header.
896 $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-
898 # Copyright (C) 1996-$RELEASE_YEAR Free Software Foundation, Inc.
900 # This file is free software; the Free Software Foundation
901 # gives unlimited permission to copy and/or distribute it,
902 # with or without modifications, as long as this notice is preserved.
904 # This program is distributed in the hope that it will be useful,
905 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without
906 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
907 # PARTICULAR PURPOSE.
911 # We try not to update $output_file unless necessary, because
912 # doing so invalidate Autom4te's cache and therefore slows down
913 # tools called after aclocal.
915 # We need to overwrite $output_file in the following situations.
916 # * The --force option is in use.
917 # * One of the dependencies is younger.
918 # (Not updating $output_file in this situation would cause
919 # make to call aclocal in loop.)
920 # * The contents of the current file are different from what
923 && $greatest_mtime < mtime ($output_file)
924 && $output eq contents ($output_file))
926 verb "$output_file unchanged";
930 verb "writing $output_file";
934 if (-e $output_file && !unlink $output_file)
936 fatal "could not remove '$output_file': $!";
938 my $out = new Automake::XFile "> $output_file";
944 ################################################################
946 # Print usage and exit.
952 Usage: aclocal [OPTION]...
954 Generate 'aclocal.m4' by scanning 'configure.ac' or 'configure.in'
957 --automake-acdir=DIR directory holding automake-provided m4 files
958 --system-acdir=DIR directory holding third-party system-wide files
959 --diff[=COMMAND] run COMMAND [diff -u] on M4 files that would be
960 changed (implies --install and --dry-run)
961 --dry-run pretend to, but do not actually update any file
962 --force always update output file
963 --help print this help, then exit
964 -I DIR add directory to search list for .m4 files
965 --install copy third-party files to the first -I directory
966 --output=FILE put output in FILE (default aclocal.m4)
967 --print-ac-dir print name of directory holding system-wide
968 third-party m4 files, then exit
969 --verbose don't be silent
970 --version print version number, then exit
971 -W, --warnings=CATEGORY report the warnings falling in CATEGORY
973 Warning categories include:
974 syntax dubious syntactic constructs (default)
975 unsupported unknown macros (default)
976 all all the warnings (default)
977 no-CATEGORY turn off warnings in CATEGORY
978 none turn off all the warnings
979 error treat warnings as errors
981 Report bugs to <@PACKAGE_BUGREPORT@>.
982 GNU Automake home page: <@PACKAGE_URL@>.
983 General help using GNU software: <http://www.gnu.org/gethelp/>.
988 # Print version and exit.
992 aclocal (GNU $PACKAGE) $VERSION
993 Copyright (C) $RELEASE_YEAR Free Software Foundation, Inc.
994 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>
995 This is free software: you are free to change and redistribute it.
996 There is NO WARRANTY, to the extent permitted by law.
998 Written by Tom Tromey <tromey\@redhat.com>
999 and Alexandre Duret-Lutz <adl\@gnu.org>.
1004 # Parse command line.
1005 sub parse_arguments ()
1007 my $print_and_exit = 0;
1012 'help' => sub { usage(0); },
1013 'version' => \&version,
1014 'system-acdir=s' => sub { shift; @system_includes = @_; },
1015 'automake-acdir=s' => sub { shift; @automake_includes = @_; },
1016 'diff:s' => \$diff_command,
1017 'dry-run' => \$dry_run,
1018 'force' => \$force_output,
1019 'I=s' => \@user_includes,
1020 'install' => \$install,
1021 'output=s' => \$output_file,
1022 'print-ac-dir' => \$print_and_exit,
1023 'verbose' => sub { setup_channel 'verb', silent => 0; },
1024 'W|warnings=s' => \&parse_warnings,
1027 use Automake::Getopt ();
1028 Automake::Getopt::parse_options %cli_options;
1032 fatal ("non-option arguments are not accepted: '$ARGV[0]'.\n"
1033 . "Try '$0 --help' for more information.");
1036 if ($print_and_exit)
1038 print "@system_includes\n";
1042 if (defined $diff_command)
1044 $diff_command = 'diff -u' if $diff_command eq '';
1045 @diff_command = split (' ', $diff_command);
1050 # Finally, adds any directory listed in the 'dirlist' file.
1051 if (open (DIRLIST, "$system_includes[0]/dirlist"))
1057 # strip off newlines and end-of-line comments
1060 foreach my $dir (glob)
1062 push (@system_includes, $dir) if -d $dir;
1069 # Add any directory listed in the 'ACLOCAL_PATH' environment variable
1070 # to the list of system include directories.
1071 sub parse_ACLOCAL_PATH ()
1073 return if not defined $ENV{"ACLOCAL_PATH"};
1074 # Directories in ACLOCAL_PATH should take precedence over system
1075 # directories, so we use unshift. However, directories that
1076 # come first in ACLOCAL_PATH take precedence over directories
1077 # coming later, which is why the result of split is reversed.
1078 foreach my $dir (reverse split /:/, $ENV{"ACLOCAL_PATH"})
1080 unshift (@system_includes, $dir) if $dir ne '' && -d $dir;
1084 ################################################################
1086 parse_WARNINGS; # Parse the WARNINGS environment variable.
1089 $configure_ac = require_configure_ac;
1091 # We may have to rerun aclocal if some file have been installed, but
1092 # it should not happen more than once. The reason we must run again
1093 # is that once the file has been moved from /usr/share/aclocal/ to the
1094 # local m4/ directory it appears at a new place in the search path,
1095 # hence it should be output at a different position in aclocal.m4. If
1096 # we did not rerun aclocal, the next run of aclocal would produce a
1097 # different aclocal.m4.
1099 my $rerun_due_to_macrodir = 0;
1103 prog_error "too many loops" if $loop > 2 + $rerun_due_to_macrodir;
1109 my %macro_traced = trace_used_macros;
1111 if (!$rerun_due_to_macrodir && @ac_config_macro_dirs)
1113 # The directory specified in calls to the AC_CONFIG_MACRO_DIRS
1114 # m4 macro (if any) must go after the user includes specified
1115 # explicitly with the '-I' option.
1116 push @user_includes, @ac_config_macro_dirs;
1117 # We might have to scan some new directory of .m4 files.
1118 $rerun_due_to_macrodir++;
1122 if ($install && !@user_includes)
1124 fatal "installation of third-party macros impossible without " .
1125 "-I options nor AC_CONFIG_MACRO_DIR{,S} m4 macro(s)";
1128 last if write_aclocal ($output_file, keys %macro_traced);
1135 ### Setup "GNU" style for perl-mode and cperl-mode.
1137 ## perl-indent-level: 2
1138 ## perl-continued-statement-offset: 2
1139 ## perl-continued-brace-offset: 0
1140 ## perl-brace-offset: 0
1141 ## perl-brace-imaginary-offset: 0
1142 ## perl-label-offset: -2
1143 ## cperl-indent-level: 2
1144 ## cperl-brace-offset: 0
1145 ## cperl-continued-brace-offset: 0
1146 ## cperl-label-offset: -2
1147 ## cperl-extra-newline-before-brace: t
1148 ## cperl-merge-trailing-else: nil
1149 ## cperl-continued-statement-offset: 2