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, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
11 # Free Software Foundation, Inc.
13 # This program is free software; you can redistribute it and/or modify
14 # it under the terms of the GNU General Public License as published by
15 # the Free Software Foundation; either version 2, or (at your option)
18 # This program is distributed in the hope that it will be useful,
19 # but WITHOUT ANY WARRANTY; without even the implied warranty of
20 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 # GNU General Public License for more details.
23 # You should have received a copy of the GNU General Public License
24 # along with this program; if not, write to the Free Software
25 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 # Written by Tom Tromey <tromey@redhat.com>.
32 my $perllibdir = $ENV{'perllibdir'} || '@datadir@/@PACKAGE@-@APIVERSION@';
33 unshift @INC, (split ':', $perllibdir);
37 use Automake::General;
38 use Automake::Configure_ac;
39 use Automake::Channels;
41 use Automake::FileUtils;
46 # Note that this isn't pkgdatadir, but a separate directory.
47 # Note also that the versioned directory is handled later.
48 $acdir = '@datadir@/aclocal';
49 $default_acdir = $acdir;
50 # contains a list of directories, one per line, to be added
51 # to the dirlist in addition to $acdir, as if -I had been
52 # added to the command line. If acdir has been redirected,
53 # we will also check the specified acdir (this is done later).
54 $default_dirlist = "$default_acdir/dirlist";
58 # configure.ac or configure.in.
62 $output_file = 'aclocal.m4';
64 # Modification time of the youngest dependency.
70 # Which macros have been seen.
73 # Which files have been seen.
76 # Remember the order into which we scanned the files.
77 # It's important to output the contents of aclocal.m4 in the opposite order.
78 # (Definitions in first files we have scanned should override those from
79 # later files. So they must appear last in the output.)
82 # Map macro names to file names.
85 # Map file names to file contents.
88 # Map file names to included files (transitively closed).
94 # Matches a macro definition.
95 # AC_DEFUN([macroname], ...)
97 # AC_DEFUN(macroname, ...)
98 # When macroname is `['-quoted , we accept any character in the name,
99 # except `]'. Otherwise macroname stops on the first `]', `,', `)',
100 # or `\n' encountered.
101 $ac_defun_rx = "A[CU]_DEFUN\\((?:\\[([^]]+)\\]|([^],)\n]+))";
103 # Matches an AC_REQUIRE line.
104 $ac_require_rx = "AC_REQUIRE\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
106 # Matches an m4_include line
107 $m4_include_rx = "(?:m4_)?s?include\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
110 ################################################################
112 # Check macros in acinclude.m4. If one is not used, warn.
113 sub check_acinclude ()
115 foreach my $key (keys %map)
117 # FIXME: should print line number of acinclude.m4.
118 warn ("aclocal: warning: macro `$key' defined in "
119 . "acinclude.m4 but never used\n")
120 if $map{$key} eq 'acinclude.m4' && ! $macro_seen{$key};
124 ################################################################
126 # Scan all the installed m4 files and construct a map.
127 sub scan_m4_files (@)
129 local (@dirlist) = @_;
131 # First, scan configure.ac. It may contain macro definitions,
132 # or may include other files that define macros.
133 &scan_file ($configure_ac);
135 # Then, scan acinclude.m4 if it exists.
136 if (-f 'acinclude.m4')
138 &scan_file ('acinclude.m4');
141 # Finally, scan all files in our search path.
143 foreach $m4dir (@dirlist)
145 if (! opendir (DIR, $m4dir))
147 print STDERR "aclocal: couldn't open directory `$m4dir': $!\n";
151 local ($file, $fullfile);
152 # We reverse the directory contents so that foo2.m4 gets
153 # used in preference to foo1.m4.
154 foreach $file (reverse sort grep (! /^\./, readdir (DIR)))
156 # Only examine .m4 files.
157 next unless $file =~ /\.m4$/;
159 # Skip some files when running out of srcdir.
160 next if $file eq 'aclocal.m4';
162 $fullfile = $m4dir . '/' . $file;
163 &scan_file ($fullfile);
168 # Construct a new function that does the searching. We use a
169 # function (instead of just evaluating $search in the loop) so that
170 # "die" is correctly and easily propagated if run.
171 my $search = "sub search {\nmy \$found = 0;\n";
172 foreach my $key (reverse sort keys %map)
174 $search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { & add_macro ("' . $key
175 . '"); $found = 1; }' . "\n");
177 $search .= "return \$found;\n};\n";
179 die "internal error: $@\n search is $search" if $@;
182 ################################################################
184 # Add a macro to the output.
189 # We want to ignore AC_ macros. However, if an AC_ macro is
190 # defined in (eg) acinclude.m4, then we want to make sure we mark
192 return if $macro =~ /^AC_/ && ! defined $map{$macro};
194 if (! defined $map{$macro})
196 warn "aclocal: macro `$macro' required but not defined\n";
201 print STDERR "aclocal: saw macro $macro\n" if $verbose;
202 $macro_seen{$macro} = 1;
203 &add_file ($map{$macro});
206 # rel2abs ($file, $directory)
207 # ---------------------------
208 # Similar to File::Spec->rel2abs ($file, $directory), but
209 # work with Perl 5.005. (File::Spec->rel2abs is available
211 # Remove this once we require 5.6.
214 my ($file, $dir) = @_;
215 if (! File::Spec->file_name_is_absolute ($file))
217 $dir = cwd () . "/$dir"
218 unless File::Spec->file_name_is_absolute ($dir);
219 $file = "$dir/$file";
221 $file = File::Spec->canonpath ($file);
225 # scan_configure_dep ($file)
226 # --------------------------
227 # Scan a configure dependency (configure.ac, or separate m4 files)
228 # for uses of know macros and AC_REQUIREs of possibly unknown macros.
229 # Recursively scan m4_included files.
230 my %scanned_configure_dep = ();
231 sub scan_configure_dep ($)
234 # Do not scan a file twice.
236 if exists $scanned_configure_dep{$file};
237 $scanned_configure_dep{$file} = 1;
239 my $mtime = mtime $file;
240 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
242 my $contents = exists $file_contents{$file} ?
243 $file_contents{$file} : contents $file;
248 foreach (split ("\n", $contents))
251 # Remove comments from current line.
255 while (/$m4_include_rx/go)
257 push (@ilist, $1 || $2);
260 while (/$ac_require_rx/go)
262 push (@rlist, $1 || $2);
265 # The search function is constructed dynamically by
266 # scan_m4_files. The last parenthetical match makes sure we
267 # don't match things that look like macro assignments or
269 if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
271 # Macro not found, but AM_ prefix found.
272 warn "aclocal: $file: $line: macro `$2' not found in library\n";
277 add_macro ($_) foreach (@rlist);
278 my $dirname = dirname $file;
279 &scan_configure_dep (rel2abs ($_, $dirname)) foreach (@ilist);
282 # Add a file to output.
287 # Only add a file once.
288 return if ($file_seen{$file});
289 $file_seen{$file} = 1;
291 scan_configure_dep $file;
294 # Point to the documentation for underquoted AC_DEFUN only once.
295 my $underquoted_manual_once = 0;
297 # Scan a single M4 file, and all files it includes.
298 # Return the list of included files.
302 my $base = dirname $file;
304 # Do not scan the same file twice.
305 return @$file_includes{$file} if exists $file_includes{$file};
306 # Prevent potential infinite recursion (if two files include each other).
307 return () if exists $file_contents{$file};
309 unshift @file_order, $file;
311 my $fh = new Automake::XFile $file;
314 while ($_ = $fh->getline)
321 while (/$ac_defun_rx/go)
325 print STDERR "$file:$.: warning: underquoted definition of $2\n";
326 print STDERR " run info '(automake)Extending aclocal'\n"
327 . " or see http://sources.redhat.com/automake/"
328 . "automake.html#Extending%20aclocal\n"
329 unless $underquoted_manual_once;
330 $underquoted_manual_once = 1;
332 my $macro = $1 || $2;
333 if (! defined $map{$macro})
335 print STDERR "aclocal: found macro $macro in $file: $.\n"
337 $map{$macro} = $file;
341 # Note: we used to give an error here if we saw a
342 # duplicated macro. However, this turns out to be
343 # extremely unpopular. It causes actual problems which
344 # are hard to work around, especially when you must
345 # mix-and-match tool versions.
346 print STDERR "aclocal: ignoring macro $macro in $file: $.\n"
351 while (/$m4_include_rx/go)
353 my $ifile = $1 || $2;
354 # m4_include is relative to the directory of the file which
355 # perform the include, but we want paths relative to the
356 # directory where aclocal is run. Do not use
357 # File::Spec->rel2abs, because we want to store relative
358 # paths (they might be used later of aclocal outputs an
359 # m4_include for this file, or if the user itself includes
361 $ifile = "$base/$ifile"
362 unless $base eq '.' || File::Spec->file_name_is_absolute ($ifile);
363 push (@inc_files, $ifile);
366 $file_contents{$file} = $contents;
368 # For some reason I don't understand, it does not work
369 # to do `map { scan_file ($_) } @inc_files' below.
370 # With Perl 5.8.2 it undefines @inc_files.
371 my @copy = @inc_files;
372 my @all_inc_files = (@inc_files, map { scan_file ($_) } @copy);
373 $file_includes{$file} = \@all_inc_files;
374 return @all_inc_files;
377 # strip_redundant_includes (%FILES)
378 # ---------------------------------
379 # Each key in %FILES is a file that must be present in the output.
380 # However some of these files might already include other files in %FILES,
381 # so there is no point in including them another time.
382 # This removes items of %FILES which are already included by another file.
383 sub strip_redundant_includes (%)
386 # Files at the end of @file_order should override those at the beginning,
387 # so it is important to preserve these trailing files. We can remove
388 # a file A if it is going to be output before a file B that includes
389 # file A, not the converse.
390 foreach my $file (reverse @file_order)
392 next unless exists $files{$file};
393 foreach my $ifile (@{$file_includes{$file}})
395 next unless exists $files{$ifile};
396 delete $files{$ifile};
397 print STDERR "$ifile is already included by $file\n"
404 sub trace_used_macros ()
406 my %files = map { $map{$_} => 1 } keys %macro_seen;
407 $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
408 %files = strip_redundant_includes %files;
409 # configure.ac is implicitly included.
410 delete $files{$configure_ac};
412 my $traces = ($ENV{AUTOM4TE} || 'autom4te');
413 $traces .= " --language Autoconf-without-aclocal-m4 ";
414 # All candidate files.
415 $traces .= join (' ', grep { exists $files{$_} } @file_order) . " ";
416 # All candidate macros.
417 $traces .= join (' ', map { "--trace='$_:\$n'" } (keys %macro_seen));
419 print STDERR "aclocal: running $traces $configure_ac\n" if $verbose;
421 my $tracefh = new Automake::XFile ("$traces $configure_ac |");
425 while ($_ = $tracefh->getline)
428 $traced{$_} = 1 if $macro_seen{$_};
436 sub scan_configure ()
438 # Make sure we include acinclude.m4 if it exists.
439 if (-f 'acinclude.m4')
441 add_file ('acinclude.m4');
443 scan_configure_dep ($configure_ac);
446 ################################################################
449 sub write_aclocal ($@)
451 my ($output_file, @macros) = @_;
454 my %files = map { $map{$_} => 1 } @macros;
455 $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
456 %files = strip_redundant_includes %files;
457 delete $files{$configure_ac};
459 for $file (grep { exists $files{$_} } @file_order)
461 # Check the time stamp of this file, and all files it includes.
462 for my $ifile ($file, @{$file_includes{$file}})
464 my $mtime = mtime $ifile;
465 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
468 # If the file to add looks like outside the project, copy it
469 # to the output. The regex catches filenames starting with
470 # things like `/', `\', or `c:\'.
471 if ($file =~ m,^(?:\w:)?[\\/],)
473 $output .= $file_contents{$file} . "\n";
477 # Otherwise, simply include the file.
478 $output .= "m4_include([$file])\n";
482 # Nothing to output?!
483 # FIXME: Shouldn't we diagnose this?
484 return if ! length ($output);
486 # We used to print `# $output_file generated automatically etc.' But
487 # this creates spurious differences when using autoreconf. Autoreconf
488 # creates aclocal.m4t and then rename it to aclocal.m4, but the
489 # rebuild rules generated by Automake create aclocal.m4 directly --
490 # this would gives two ways to get the same file, with a different
491 # name in the header.
492 $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-
494 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
495 # Free Software Foundation, Inc.
496 # This file is free software; the Free Software Foundation
497 # gives unlimited permission to copy and/or distribute it,
498 # with or without modifications, as long as this notice is preserved.
500 # This program is distributed in the hope that it will be useful,
501 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without
502 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
503 # PARTICULAR PURPOSE.
507 # We try not to update $output_file unless necessary, because
508 # doing so invalidate Autom4te's cache and therefore slows down
509 # tools called after aclocal.
511 # We need to overwrite $output_file in the following situations.
512 # * The --force option is in use.
513 # * One of the dependencies is younger.
514 # (Not updating $output_file in this situation would cause
515 # make to call aclocal in loop.)
516 # * The contents of the current file are different from what
519 && $greatest_mtime < mtime ($output_file)
520 && $output eq contents ($output_file))
522 print STDERR "aclocal: $output_file unchanged\n" if $verbose;
526 print STDERR "aclocal: writing $output_file\n" if $verbose;
528 my $out = new Automake::XFile "> $output_file";
533 ################################################################
535 # Print usage and exit.
538 local ($status) = @_;
540 print "Usage: aclocal [OPTIONS] ...\n\n";
542 Generate `aclocal.m4' by scanning `configure.ac' or `configure.in'
544 --acdir=DIR directory holding config files
545 --help print this help, then exit
546 -I DIR add directory to search list for .m4 files
547 --force always update output file
548 --output=FILE put output in FILE (default aclocal.m4)
549 --print-ac-dir print name of directory holding m4 files
550 --verbose don't be silent
551 --version print version number, then exit
553 Report bugs to <bug-automake\@gnu.org>.\n";
558 # Parse command line.
559 sub parse_arguments (@)
561 local (@arglist) = @_;
563 local ($print_and_exit) = 0;
567 if ($arglist[0] =~ /^--acdir=(.+)$/)
571 elsif ($arglist[0] =~/^--output=(.+)$/)
575 elsif ($arglist[0] eq '-I')
578 push (@dirlist, $arglist[0]);
580 elsif ($arglist[0] eq '--print-ac-dir')
584 elsif ($arglist[0] eq '--force')
588 elsif ($arglist[0] eq '--verbose')
592 elsif ($arglist[0] eq '--version')
594 print "aclocal (GNU $PACKAGE) $VERSION\n";
595 print "Written by Tom Tromey <tromey\@redhat.com>\n\n";
596 print "Copyright (C) 2004 Free Software Foundation, Inc.\n";
597 print "This is free software; see the source for copying conditions. There is NO\n";
598 print "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n";
601 elsif ($arglist[0] eq '--help')
607 print STDERR "aclocal: unrecognized option -- `$arglist[0]'\nTry `aclocal --help' for more information.\n";
620 $default_dirlist="$acdir/dirlist"
621 if $acdir ne $default_acdir;
623 # Search the versioned directory near the end, and then the
624 # unversioned directory last. Only do this if the user didn't
626 push (@dirlist, "$acdir-$APIVERSION")
627 if $acdir eq $default_acdir;
629 # By default $(datadir)/aclocal doesn't exist. We don't want to
630 # get an error in the case where we are searching the default
631 # directory and it hasn't been created.
632 push (@dirlist, $acdir)
633 unless $acdir eq $default_acdir && ! -d $acdir;
635 # Finally, adds any directory listed in the `dirlist' file.
636 if (open (DEFAULT_DIRLIST, $default_dirlist))
638 while (<DEFAULT_DIRLIST>)
642 # strip off newlines and end-of-line comments
644 chomp ($contents=$_);
647 push (@dirlist, $contents);
650 close (DEFAULT_DIRLIST);
656 ################################################################
658 local (@dirlist) = parse_arguments (@ARGV);
659 $configure_ac = require_configure_ac;
660 scan_m4_files (@dirlist);
664 my %macro_traced = trace_used_macros;
665 write_aclocal ($output_file, keys %macro_traced);
671 ### Setup "GNU" style for perl-mode and cperl-mode.
673 ## perl-indent-level: 2
674 ## perl-continued-statement-offset: 2
675 ## perl-continued-brace-offset: 0
676 ## perl-brace-offset: 0
677 ## perl-brace-imaginary-offset: 0
678 ## perl-label-offset: -2
679 ## cperl-indent-level: 2
680 ## cperl-brace-offset: 0
681 ## cperl-continued-brace-offset: 0
682 ## cperl-label-offset: -2
683 ## cperl-extra-newline-before-brace: t
684 ## cperl-merge-trailing-else: nil
685 ## cperl-continued-statement-offset: 2