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) 1996-2013 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 @Aclocal::perl_libdirs = ('@datadir@/@PACKAGE@-@APIVERSION@')
31 unless @Aclocal::perl_libdirs;
32 unshift @INC, @Aclocal::perl_libdirs;
38 use Automake::General;
39 use Automake::Configure_ac;
40 use Automake::Channels;
41 use Automake::ChannelDefs;
43 use Automake::FileUtils;
49 # Support AC_CONFIG_MACRO_DIRS also with older autoconf.
50 # FIXME: To be removed in Automake 1.14, once we can assume autoconf
52 # FIXME: keep in sync with 'internal/ac-config-macro-dirs.m4'.
53 my $ac_config_macro_dirs_fallback =
54 'm4_ifndef([AC_CONFIG_MACRO_DIRS], [' .
55 'm4_defun([_AM_CONFIG_MACRO_DIRS], [])' .
56 'm4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])' .
59 # We do not operate in threaded mode.
62 # Include paths for searching macros. We search macros in this order:
63 # user-supplied directories first, then the directory containing the
64 # automake macros, and finally the system-wide directories for
66 # @user_includes can be augmented with -I or AC_CONFIG_MACRO_DIRS.
67 # @automake_includes can be reset with the '--automake-acdir' option.
68 # @system_includes can be augmented with the 'dirlist' file or the
69 # ACLOCAL_PATH environment variable, and reset with the '--system-acdir'
71 my @user_includes = ();
72 my @automake_includes = ("@datadir@/aclocal-$APIVERSION");
73 my @system_includes = ('@datadir@/aclocal');
75 # Whether we should copy M4 file in $user_includes[0].
84 # configure.ac or configure.in.
88 my $output_file = 'aclocal.m4';
93 # Modification time of the youngest dependency.
94 my $greatest_mtime = 0;
96 # Which macros have been seen.
99 # Remember the order into which we scanned the files.
100 # It's important to output the contents of aclocal.m4 in the opposite order.
101 # (Definitions in first files we have scanned should override those from
102 # later files. So they must appear last in the output.)
105 # Map macro names to file names.
108 # Ditto, but records the last definition of each macro as returned by --trace.
109 my %map_traced_defs = ();
111 # Map basenames to macro names.
114 # Map file names to file contents.
115 my %file_contents = ();
117 # Map file names to file types.
119 use constant FT_USER => 1;
120 use constant FT_AUTOMAKE => 2;
121 use constant FT_SYSTEM => 3;
123 # Map file names to included files (transitively closed).
124 my %file_includes = ();
126 # Files which have already been added.
129 # Files that have already been scanned.
130 my %scanned_configure_dep = ();
132 # Serial numbers, for files that have one.
133 # The key is the basename of the file,
134 # the value is the serial number represented as a list.
137 # Matches a macro definition.
138 # AC_DEFUN([macroname], ...)
140 # AC_DEFUN(macroname, ...)
141 # When macroname is '['-quoted , we accept any character in the name,
142 # except ']'. Otherwise macroname stops on the first ']', ',', ')',
143 # or '\n' encountered.
145 "(?:AU_ALIAS|A[CU]_DEFUN|AC_DEFUN_ONCE)\\((?:\\[([^]]+)\\]|([^],)\n]+))";
147 # Matches an AC_REQUIRE line.
148 my $ac_require_rx = "AC_REQUIRE\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
150 # Matches an m4_include line.
151 my $m4_include_rx = "(m4_|m4_s|s)include\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
153 # Match a serial number.
154 my $serial_line_rx = '^#\s*serial\s+(\S*)';
155 my $serial_number_rx = '^\d+(?:\.\d+)*$';
157 # Autoconf version. This variable is set by 'trace_used_macros'.
160 # User directory containing extra m4 files for macros definition,
161 # as extracted from calls to the macro AC_CONFIG_MACRO_DIRS.
162 # This variable is updated by 'trace_used_macros'.
163 my @ac_config_macro_dirs;
165 # If set, names a temporary file that must be erased on abnormal exit.
168 # Constants for the $ERR_LEVEL parameter of the 'scan_m4_dirs' function.
169 use constant SCAN_M4_DIRS_SILENT => 0;
170 use constant SCAN_M4_DIRS_WARN => 1;
171 use constant SCAN_M4_DIRS_ERROR => 2;
173 ################################################################
175 # Prototypes for all subroutines.
179 sub check_acinclude ();
181 sub install_file ($$);
182 sub list_compare (\@\@);
183 sub scan_m4_dirs ($$@);
184 sub scan_m4_files ();
186 sub scan_configure_dep ($);
189 sub strip_redundant_includes (%);
190 sub trace_used_macros ();
191 sub scan_configure ();
192 sub write_aclocal ($@);
195 sub handle_acdir_option ($$);
196 sub parse_arguments ();
197 sub parse_ACLOCAL_PATH ();
199 ################################################################
201 # Erase temporary file ERASE_ME. Handle signals.
208 verb "caught SIG$sig, bailing out";
210 if (defined $erase_me && -e $erase_me && !unlink ($erase_me))
212 fatal "could not remove '$erase_me': $!";
216 # reraise default handler.
219 $SIG{$sig} = 'DEFAULT';
224 $SIG{'INT'} = $SIG{'TERM'} = $SIG{'QUIT'} = $SIG{'HUP'} = 'unlink_tmp';
232 if -d $dir or eval { File::Path::mkpath $dir };
234 $@ =~ s/\s+at\s.*\bline\s\d+.*$//;
235 fatal "could not create directory '$dir': $@";
238 # Check macros in acinclude.m4. If one is not used, warn.
239 sub check_acinclude ()
241 foreach my $key (keys %map)
243 # FIXME: should print line number of acinclude.m4.
244 msg ('syntax', "macro '$key' defined in acinclude.m4 but never used")
245 if $map{$key} eq 'acinclude.m4' && ! exists $macro_seen{$key};
255 %map_traced_defs = ();
260 %scanned_configure_dep = ();
266 # install_file ($SRC, $DESTDIR)
267 sub install_file ($$)
269 my ($src, $destdir) = @_;
270 my $dest = $destdir . "/" . basename ($src);
273 verb "installing $src to $dest";
276 || !exists $file_contents{$dest}
277 || $file_contents{$src} ne $file_contents{$dest})
281 msg 'note', "overwriting '$dest' with '$src'";
286 msg 'note', "installing '$dest' from '$src'";
291 if (! defined $diff_dest)
293 # $dest does not exist. We create an empty one just to
294 # run diff, and we erase it afterward. Using the real
295 # the destination file (rather than a temporary file) is
296 # good when diff is run with options that display the
299 # If creating $dest fails, fall back to /dev/null. At
300 # least one diff implementation (Tru64's) cannot deal
301 # with /dev/null. However working around this is not
302 # worth the trouble since nobody run aclocal on a
303 # read-only tree anyway.
305 my $f = new IO::File "> $dest";
309 $diff_dest = '/dev/null';
317 my @cmd = (@diff_command, $diff_dest, $src);
319 verb "running: @cmd";
320 my $res = system (@cmd);
321 Automake::FileUtils::handle_exec_errors "@cmd", 1
328 xsystem ('cp', $src, $dest);
333 # Compare two lists of numbers.
334 sub list_compare (\@\@)
342 return (0 == @r) ? 0 : -1;
348 elsif ($l[0] < $r[0])
352 elsif ($l[0] > $r[0])
361 ################################################################
363 # scan_m4_dirs($TYPE, $ERR_LEVEL, @DIRS)
364 # -----------------------------------------------
365 # Scan all M4 files installed in @DIRS for new macro definitions.
366 # Register each file as of type $TYPE (one of the FT_* constants).
367 # If a directory in @DIRS cannot be read:
368 # - fail hard if $ERR_LEVEL == SCAN_M4_DIRS_ERROR
369 # - just print a warning if $ERR_LEVEL == SCAN_M4_DIRS_WA
370 # - continue silently if $ERR_LEVEL == SCAN_M4_DIRS_SILENT
371 sub scan_m4_dirs ($$@)
373 my ($type, $err_level, @dirlist) = @_;
375 foreach my $m4dir (@dirlist)
377 if (! opendir (DIR, $m4dir))
379 # TODO: maybe avoid complaining only if errno == ENONENT?
380 my $message = "couldn't open directory '$m4dir': $!";
382 if ($err_level == SCAN_M4_DIRS_ERROR)
386 elsif ($err_level == SCAN_M4_DIRS_WARN)
388 msg ('unsupported', $message);
391 elsif ($err_level == SCAN_M4_DIRS_SILENT)
393 next; # Silently ignore.
397 prog_error "invalid \$err_level value '$err_level'";
401 # We reverse the directory contents so that foo2.m4 gets
402 # used in preference to foo1.m4.
403 foreach my $file (reverse sort grep (! /^\./, readdir (DIR)))
405 # Only examine .m4 files.
406 next unless $file =~ /\.m4$/;
408 # Skip some files when running out of srcdir.
409 next if $file eq 'aclocal.m4';
411 my $fullfile = File::Spec->canonpath ("$m4dir/$file");
412 scan_file ($type, $fullfile, 'aclocal');
418 # Scan all the installed m4 files and construct a map.
421 # First, scan configure.ac. It may contain macro definitions,
422 # or may include other files that define macros.
423 scan_file (FT_USER, $configure_ac, 'aclocal');
425 # Then, scan acinclude.m4 if it exists.
426 if (-f 'acinclude.m4')
428 scan_file (FT_USER, 'acinclude.m4', 'aclocal');
431 # Finally, scan all files in our search paths.
435 # Don't complain if the first user directory doesn't exist, in case
436 # we need to create it later (can happen if '--install' was given).
437 scan_m4_dirs (FT_USER,
438 $install ? SCAN_M4_DIRS_SILENT : SCAN_M4_DIRS_WARN,
440 scan_m4_dirs (FT_USER,
442 @user_includes[1..$#user_includes]);
444 scan_m4_dirs (FT_AUTOMAKE, SCAN_M4_DIRS_ERROR, @automake_includes);
445 scan_m4_dirs (FT_SYSTEM, SCAN_M4_DIRS_ERROR, @system_includes);
447 # Construct a new function that does the searching. We use a
448 # function (instead of just evaluating $search in the loop) so that
449 # "die" is correctly and easily propagated if run.
450 my $search = "sub search {\nmy \$found = 0;\n";
451 foreach my $key (reverse sort keys %map)
453 $search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { add_macro ("' . $key
454 . '"); $found = 1; }' . "\n");
456 $search .= "return \$found;\n};\n";
458 prog_error "$@\n search is $search" if $@;
461 ################################################################
463 # Add a macro to the output.
468 # Ignore unknown required macros. Either they are not really
469 # needed (e.g., a conditional AC_REQUIRE), in which case aclocal
470 # should be quiet, or they are needed and Autoconf itself will
471 # complain when we trace for macro usage later.
472 return unless defined $map{$macro};
474 verb "saw macro $macro";
475 $macro_seen{$macro} = 1;
476 add_file ($map{$macro});
479 # scan_configure_dep ($file)
480 # --------------------------
481 # Scan a configure dependency (configure.ac, or separate m4 files)
482 # for uses of known macros and AC_REQUIREs of possibly unknown macros.
483 # Recursively scan m4_included files.
484 sub scan_configure_dep ($)
487 # Do not scan a file twice.
489 if exists $scanned_configure_dep{$file};
490 $scanned_configure_dep{$file} = 1;
492 my $mtime = mtime $file;
493 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
495 my $contents = exists $file_contents{$file} ?
496 $file_contents{$file} : contents $file;
501 foreach (split ("\n", $contents))
504 # Remove comments from current line.
507 # Avoid running all the following regexes on white lines.
510 while (/$m4_include_rx/go)
512 my $ifile = $2 || $3;
513 # Skip missing 'sinclude'd files.
514 next if $1 ne 'm4_' && ! -f $ifile;
518 while (/$ac_require_rx/go)
520 push (@rlist, $1 || $2);
523 # The search function is constructed dynamically by
524 # scan_m4_files. The last parenthetical match makes sure we
525 # don't match things that look like macro assignments or
527 if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
529 # Macro not found, but AM_ prefix found.
530 # Make this just a warning, because we do not know whether
531 # the macro is actually used (it could be called conditionally).
532 msg ('unsupported', "$file:$line",
533 "macro '$2' not found in library");
537 add_macro ($_) foreach (@rlist);
538 scan_configure_dep ($_) foreach @ilist;
543 # Add $FILE to output.
548 # Only add a file once.
549 return if ($file_added{$file});
550 $file_added{$file} = 1;
552 scan_configure_dep $file;
555 # Point to the documentation for underquoted AC_DEFUN only once.
556 my $underquoted_manual_once = 0;
558 # scan_file ($TYPE, $FILE, $WHERE)
559 # --------------------------------
560 # Scan a single M4 file ($FILE), and all files it includes.
561 # Return the list of included files.
562 # $TYPE is one of FT_USER, FT_AUTOMAKE, or FT_SYSTEM, depending
563 # on where the file comes from.
564 # $WHERE is the location to use in the diagnostic if the file
568 my ($type, $file, $where) = @_;
569 my $basename = basename $file;
571 # Do not scan the same file twice.
572 return @{$file_includes{$file}} if exists $file_includes{$file};
573 # Prevent potential infinite recursion (if two files include each other).
574 return () if exists $file_contents{$file};
576 unshift @file_order, $file;
578 $file_type{$file} = $type;
580 fatal "$where: file '$file' does not exist" if ! -e $file;
582 my $fh = new Automake::XFile $file;
589 my $serial_older = 0;
591 while ($_ = $fh->getline)
599 if ($line =~ /$serial_line_rx/go)
602 if ($number !~ /$serial_number_rx/go)
604 msg ('syntax', "$file:$.",
605 "ill-formed serial number '$number', "
606 . "expecting a version string with only digits and dots");
610 # aclocal removes all definitions from M4 file with the
611 # same basename if a greater serial number is found.
612 # Encountering a serial after some macros will undefine
614 msg ('syntax', "$file:$.",
615 'the serial number must appear before any macro definition');
617 # We really care about serials only for non-automake macros
618 # and when --install is used. But the above diagnostics are
619 # made regardless of this, because not using --install is
620 # not a reason not the fix macro files.
621 elsif ($install && $type != FT_AUTOMAKE)
624 my @new = split (/\./, $number);
626 verb "$file:$.: serial $number";
628 if (!exists $serial{$basename}
629 || list_compare (@new, @{$serial{$basename}}) > 0)
631 # Delete any definition we knew from the old macro.
632 foreach my $def (@{$invmap{$basename}})
634 verb "$file:$.: ignoring previous definition of $def";
637 $invmap{$basename} = [];
638 $serial{$basename} = \@new;
647 # Remove comments from current line.
648 # Do not do it earlier, because the serial line is a comment.
649 $line =~ s/\bdnl\b.*$//;
652 while ($line =~ /$ac_defun_rx/go)
657 msg ('syntax', "$file:$.", "underquoted definition of $2"
658 . "\n run info Automake 'Extending aclocal'\n"
659 . " or see http://www.gnu.org/software/automake/manual/"
660 . "automake.html#Extending-aclocal")
661 unless $underquoted_manual_once;
662 $underquoted_manual_once = 1;
665 # If this macro does not have a serial and we have already
666 # seen a macro with the same basename earlier, we should
667 # ignore the macro (don't exit immediately so we can still
668 # diagnose later #serial numbers and underquoted macros).
669 $serial_older ||= ($type != FT_AUTOMAKE
670 && !$serial_seen && exists $serial{$basename});
672 my $macro = $1 || $2;
673 if (!$serial_older && !defined $map{$macro})
675 verb "found macro $macro in $file: $.";
676 $map{$macro} = $file;
677 push @{$invmap{$basename}}, $macro;
681 # Note: we used to give an error here if we saw a
682 # duplicated macro. However, this turns out to be
683 # extremely unpopular. It causes actual problems which
684 # are hard to work around, especially when you must
685 # mix-and-match tool versions.
686 verb "ignoring macro $macro in $file: $.";
690 while ($line =~ /$m4_include_rx/go)
692 my $ifile = $2 || $3;
693 # Skip missing 'sinclude'd files.
694 next if $1 ne 'm4_' && ! -f $ifile;
695 push (@inc_files, $ifile);
696 $inc_lines{$ifile} = $.;
700 # Ignore any file that has an old serial (or no serial if we know
701 # another one with a serial).
704 ($type != FT_AUTOMAKE && !$serial_seen && exists $serial{$basename}));
706 $file_contents{$file} = $contents;
708 # For some reason I don't understand, it does not work
709 # to do "map { scan_file ($_, ...) } @inc_files" below.
710 # With Perl 5.8.2 it undefines @inc_files.
711 my @copy = @inc_files;
712 my @all_inc_files = (@inc_files,
713 map { scan_file ($type, $_,
714 "$file:$inc_lines{$_}") } @copy);
715 $file_includes{$file} = \@all_inc_files;
716 return @all_inc_files;
719 # strip_redundant_includes (%FILES)
720 # ---------------------------------
721 # Each key in %FILES is a file that must be present in the output.
722 # However some of these files might already include other files in %FILES,
723 # so there is no point in including them another time.
724 # This removes items of %FILES which are already included by another file.
725 sub strip_redundant_includes (%)
729 # Always include acinclude.m4, even if it does not appear to be used.
730 $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
731 # File included by $configure_ac are redundant.
732 $files{$configure_ac} = 1;
734 # Files at the end of @file_order should override those at the beginning,
735 # so it is important to preserve these trailing files. We can remove
736 # a file A if it is going to be output before a file B that includes
737 # file A, not the converse.
738 foreach my $file (reverse @file_order)
740 next unless exists $files{$file};
741 foreach my $ifile (@{$file_includes{$file}})
743 next unless exists $files{$ifile};
744 delete $files{$ifile};
745 verb "$ifile is already included by $file";
749 # configure.ac is implicitly included.
750 delete $files{$configure_ac};
755 sub trace_used_macros ()
757 my %files = map { $map{$_} => 1 } keys %macro_seen;
758 %files = strip_redundant_includes %files;
760 # When AC_CONFIG_MACRO_DIRS is used, avoid possible spurious warnings
761 # from autom4te about macros being "m4_require'd but not m4_defun'd";
762 # for more background, see:
763 # http://lists.gnu.org/archive/html/autoconf-patches/2012-11/msg00004.html
764 # as well as autoconf commit 'v2.69-44-g1ed0548', "warn: allow aclocal
765 # to silence m4_require warnings".
766 my $early_m4_code .= "m4_define([m4_require_silent_probe], [-])";
768 my $traces = ($ENV{AUTOM4TE} || '@am_AUTOM4TE@');
769 $traces .= " --language Autoconf-without-aclocal-m4 ";
770 $traces = "echo '$early_m4_code' | $traces - ";
772 # Support AC_CONFIG_MACRO_DIRS also with older autoconf.
773 # Note that we can't use '$ac_config_macro_dirs_fallback' here, because
774 # a bug in option parsing code of autom4te 2.68 and earlier will cause
775 # it to read standard input last, even if the "-" argument is specified
777 # FIXME: To be removed in Automake 1.14, once we can assume autoconf
779 $traces .= "$automake_includes[0]/internal/ac-config-macro-dirs.m4 ";
781 # All candidate files.
782 $traces .= join (' ',
784 (grep { exists $files{$_} } @file_order))) . " ";
786 # All candidate macros.
787 $traces .= join (' ',
788 (map { "--trace='$_:\$f::\$n::\${::}%'" }
792 '_AM_AUTOCONF_VERSION',
793 'AC_CONFIG_MACRO_DIR_TRACE',
794 # FIXME: Tracing the next two macros is a hack for
795 # compatibility with older autoconf. Remove this in
796 # Automake 1.14, when we can assume Autoconf 2.70 or
798 'AC_CONFIG_MACRO_DIR',
799 '_AM_CONFIG_MACRO_DIRS')),
800 # Do not trace $1 for all other macros as we do
801 # not need it and it might contains harmful
802 # characters (like newlines).
803 (map { "--trace='$_:\$f::\$n'" } (keys %macro_seen)));
805 verb "running $traces $configure_ac";
807 my $tracefh = new Automake::XFile ("$traces $configure_ac |");
809 @ac_config_macro_dirs = ();
813 while ($_ = $tracefh->getline)
816 my ($file, $macro, $arg1) = split (/::/);
818 $traced{$macro} = 1 if exists $macro_seen{$macro};
820 if ($macro eq 'AC_DEFUN' || $macro eq 'AC_DEFUN_ONCE'
821 || $macro eq 'AU_DEFUN')
823 $map_traced_defs{$arg1} = $file;
825 elsif ($macro eq '_AM_AUTOCONF_VERSION')
829 elsif ($macro eq 'AC_CONFIG_MACRO_DIR_TRACE')
831 push @ac_config_macro_dirs, $arg1;
833 # FIXME: We still need to trace AC_CONFIG_MACRO_DIR
834 # for compatibility with older autoconf. Remove this
835 # once we can assume Autoconf 2.70 or later.
836 elsif ($macro eq 'AC_CONFIG_MACRO_DIR')
838 @ac_config_macro_dirs = ($arg1);
840 # FIXME:This is an hack for compatibility with older autoconf.
841 # Remove this once we can assume Autoconf 2.70 or later.
842 elsif ($macro eq '_AM_CONFIG_MACRO_DIRS')
844 # Empty leading/trailing fields might be produced by split,
845 # hence the grep is really needed.
846 push @ac_config_macro_dirs, grep (/./, (split /\s+/, $arg1));
850 # FIXME: in Autoconf >= 2.70, AC_CONFIG_MACRO_DIR calls
851 # AC_CONFIG_MACRO_DIR_TRACE behind the scenes, which could
852 # leave unwanted duplicates in @ac_config_macro_dirs.
853 # Remove this in Automake 1.14, when we'll stop tracing
854 # AC_CONFIG_MACRO_DIR explicitly.
855 @ac_config_macro_dirs = uniq @ac_config_macro_dirs;
862 sub scan_configure ()
864 # Make sure we include acinclude.m4 if it exists.
865 if (-f 'acinclude.m4')
867 add_file ('acinclude.m4');
869 scan_configure_dep ($configure_ac);
872 ################################################################
875 # Return 0 iff some files were installed locally.
876 sub write_aclocal ($@)
878 my ($output_file, @macros) = @_;
882 # Get the list of files containing definitions for the macros used.
883 # (Filter out unused macro definitions with $map_traced_defs. This
884 # can happen when an Autoconf macro is conditionally defined:
885 # aclocal sees the potential definition, but this definition is
886 # actually never processed and the Autoconf implementation is used
891 if (exists $map_traced_defs{$m}
892 && $map{$m} eq $map_traced_defs{$m});
894 # Do not explicitly include a file that is already indirectly included.
895 %files = strip_redundant_includes %files;
899 for my $file (grep { exists $files{$_} } @file_order)
901 # Check the time stamp of this file, and of all files it includes.
902 for my $ifile ($file, @{$file_includes{$file}})
904 my $mtime = mtime $ifile;
905 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
908 # If the file to add looks like outside the project, copy it
909 # to the output. The regex catches filenames starting with
910 # things like '/', '\', or 'c:\'.
911 if ($file_type{$file} != FT_USER
912 || $file =~ m,^(?:\w:)?[\\/],)
914 if (!$install || $file_type{$file} != FT_SYSTEM)
916 # Copy the file into aclocal.m4.
917 $output .= $file_contents{$file} . "\n";
921 # Install the file (and any file it includes).
923 for my $ifile (@{$file_includes{$file}}, $file)
925 install_file ($ifile, $user_includes[0]);
932 # Otherwise, simply include the file.
933 $output .= "m4_include([$file])\n";
939 verb "running aclocal anew, because some files were installed locally";
943 # Nothing to output?!
944 # FIXME: Shouldn't we diagnose this?
945 return 1 if ! length ($output);
949 # Do not use "$output_file" here for the same reason we do not
950 # use it in the header below. autom4te will output the name of
951 # the file in the diagnostic anyway.
952 $output = "m4_ifndef([AC_AUTOCONF_VERSION],
953 [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
954 m4_if(m4_defn([AC_AUTOCONF_VERSION]), [$ac_version],,
955 [m4_warning([this file was generated for autoconf $ac_version.
956 You have another version of autoconf. It may work, but is not guaranteed to.
957 If you have problems, you may need to regenerate the build system entirely.
958 To do so, use the procedure documented by the package, typically 'autoreconf'.])])
963 # We used to print "# $output_file generated automatically etc." But
964 # this creates spurious differences when using autoreconf. Autoreconf
965 # creates aclocal.m4t and then rename it to aclocal.m4, but the
966 # rebuild rules generated by Automake create aclocal.m4 directly --
967 # this would gives two ways to get the same file, with a different
968 # name in the header.
969 $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-
971 # Copyright (C) 1996-$RELEASE_YEAR Free Software Foundation, Inc.
973 # This file is free software; the Free Software Foundation
974 # gives unlimited permission to copy and/or distribute it,
975 # with or without modifications, as long as this notice is preserved.
977 # This program is distributed in the hope that it will be useful,
978 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without
979 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
980 # PARTICULAR PURPOSE.
982 $ac_config_macro_dirs_fallback
985 # We try not to update $output_file unless necessary, because
986 # doing so invalidate Autom4te's cache and therefore slows down
987 # tools called after aclocal.
989 # We need to overwrite $output_file in the following situations.
990 # * The --force option is in use.
991 # * One of the dependencies is younger.
992 # (Not updating $output_file in this situation would cause
993 # make to call aclocal in loop.)
994 # * The contents of the current file are different from what
997 && $greatest_mtime < mtime ($output_file)
998 && $output eq contents ($output_file))
1000 verb "$output_file unchanged";
1004 verb "writing $output_file";
1008 if (-e $output_file && !unlink $output_file)
1010 fatal "could not remove '$output_file': $!";
1012 my $out = new Automake::XFile "> $output_file";
1018 ################################################################
1020 # Print usage and exit.
1026 Usage: aclocal [OPTION]...
1028 Generate 'aclocal.m4' by scanning 'configure.ac' or 'configure.in'
1031 --automake-acdir=DIR directory holding automake-provided m4 files
1032 --system-acdir=DIR directory holding third-party system-wide files
1033 --diff[=COMMAND] run COMMAND [diff -u] on M4 files that would be
1034 changed (implies --install and --dry-run)
1035 --dry-run pretend to, but do not actually update any file
1036 --force always update output file
1037 --help print this help, then exit
1038 -I DIR add directory to search list for .m4 files
1039 --install copy third-party files to the first -I directory
1040 --output=FILE put output in FILE (default aclocal.m4)
1041 --print-ac-dir print name of directory holding system-wide
1042 third-party m4 files, then exit
1043 --verbose don't be silent
1044 --version print version number, then exit
1045 -W, --warnings=CATEGORY report the warnings falling in CATEGORY
1047 Warning categories include:
1048 syntax dubious syntactic constructs (default)
1049 unsupported unknown macros (default)
1050 all all the warnings (default)
1051 no-CATEGORY turn off warnings in CATEGORY
1052 none turn off all the warnings
1053 error treat warnings as errors
1055 Report bugs to <@PACKAGE_BUGREPORT@>.
1056 GNU Automake home page: <@PACKAGE_URL@>.
1057 General help using GNU software: <http://www.gnu.org/gethelp/>.
1062 # Print version and exit.
1066 aclocal (GNU $PACKAGE) $VERSION
1067 Copyright (C) $RELEASE_YEAR Free Software Foundation, Inc.
1068 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>
1069 This is free software: you are free to change and redistribute it.
1070 There is NO WARRANTY, to the extent permitted by law.
1072 Written by Tom Tromey <tromey\@redhat.com>
1073 and Alexandre Duret-Lutz <adl\@gnu.org>.
1078 # Parse command line.
1079 sub parse_arguments ()
1081 my $print_and_exit = 0;
1086 'help' => sub { usage(0); },
1087 'version' => \&version,
1088 'system-acdir=s' => sub { shift; @system_includes = @_; },
1089 'automake-acdir=s' => sub { shift; @automake_includes = @_; },
1090 'diff:s' => \$diff_command,
1091 'dry-run' => \$dry_run,
1092 'force' => \$force_output,
1093 'I=s' => \@user_includes,
1094 'install' => \$install,
1095 'output=s' => \$output_file,
1096 'print-ac-dir' => \$print_and_exit,
1097 'verbose' => sub { setup_channel 'verb', silent => 0; },
1098 'W|warnings=s' => \&parse_warnings,
1101 use Automake::Getopt ();
1102 Automake::Getopt::parse_options %cli_options;
1106 fatal ("non-option arguments are not accepted: '$ARGV[0]'.\n"
1107 . "Try '$0 --help' for more information.");
1110 if ($print_and_exit)
1112 print "@system_includes\n";
1116 if (defined $diff_command)
1118 $diff_command = 'diff -u' if $diff_command eq '';
1119 @diff_command = split (' ', $diff_command);
1124 # Finally, adds any directory listed in the 'dirlist' file.
1125 if (open (DIRLIST, "$system_includes[0]/dirlist"))
1131 # strip off newlines and end-of-line comments
1134 foreach my $dir (glob)
1136 push (@system_includes, $dir) if -d $dir;
1143 # Add any directory listed in the 'ACLOCAL_PATH' environment variable
1144 # to the list of system include directories.
1145 sub parse_ACLOCAL_PATH ()
1147 return if not defined $ENV{"ACLOCAL_PATH"};
1148 # Directories in ACLOCAL_PATH should take precedence over system
1149 # directories, so we use unshift. However, directories that
1150 # come first in ACLOCAL_PATH take precedence over directories
1151 # coming later, which is why the result of split is reversed.
1152 foreach my $dir (reverse split /:/, $ENV{"ACLOCAL_PATH"})
1154 unshift (@system_includes, $dir) if $dir ne '' && -d $dir;
1158 ################################################################
1160 parse_WARNINGS; # Parse the WARNINGS environment variable.
1163 $configure_ac = require_configure_ac;
1165 # We may have to rerun aclocal if some file have been installed, but
1166 # it should not happen more than once. The reason we must run again
1167 # is that once the file has been moved from /usr/share/aclocal/ to the
1168 # local m4/ directory it appears at a new place in the search path,
1169 # hence it should be output at a different position in aclocal.m4. If
1170 # we did not rerun aclocal, the next run of aclocal would produce a
1171 # different aclocal.m4.
1173 my $rerun_due_to_macrodir = 0;
1177 prog_error "too many loops" if $loop > 2 + $rerun_due_to_macrodir;
1183 my %macro_traced = trace_used_macros;
1185 if (!$rerun_due_to_macrodir && @ac_config_macro_dirs)
1187 # The directory specified in calls to the AC_CONFIG_MACRO_DIRS
1188 # m4 macro (if any) must go after the user includes specified
1189 # explicitly with the '-I' option.
1190 push @user_includes, @ac_config_macro_dirs;
1191 # We might have to scan some new directory of .m4 files.
1192 $rerun_due_to_macrodir++;
1196 if ($install && !@user_includes)
1198 fatal "installation of third-party macros impossible without " .
1199 "-I options nor AC_CONFIG_MACRO_DIR{,S} m4 macro(s)";
1202 last if write_aclocal ($output_file, keys %macro_traced);
1209 ### Setup "GNU" style for perl-mode and cperl-mode.
1211 ## perl-indent-level: 2
1212 ## perl-continued-statement-offset: 2
1213 ## perl-continued-brace-offset: 0
1214 ## perl-brace-offset: 0
1215 ## perl-brace-imaginary-offset: 0
1216 ## perl-label-offset: -2
1217 ## cperl-indent-level: 2
1218 ## cperl-brace-offset: 0
1219 ## cperl-continued-brace-offset: 0
1220 ## cperl-label-offset: -2
1221 ## cperl-extra-newline-before-brace: t
1222 ## cperl-merge-trailing-else: nil
1223 ## cperl-continued-statement-offset: 2