source: trunk/essentials/sys-devel/automake-1.9/aclocal.in@ 3466

Last change on this file since 3466 was 3143, checked in by bird, 19 years ago

Unixroot and one silly ':' issue.
File size: 20.0 KB
Line 
1#!@PERL@
2# -*- perl -*-
3# @configure_input@
4
5eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
6 if 0;
7
8# aclocal - create aclocal.m4 by scanning configure.ac
9
10# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
11# Free Software Foundation, Inc.
12
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)
16# any later version.
17
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.
22
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., 51 Franklin Street, Fifth Floor, Boston, MA
26# 02110-1301, USA.
27
28# Written by Tom Tromey <tromey@redhat.com>.
29
30BEGIN
31{
32 my $perllibdir = $ENV{'perllibdir'} || $ENV{'UNIXROOT'}.'@datadir@/@PACKAGE@-@APIVERSION@';
33 $perllibdir =~ s/$ENV{'UNIXROOT'}\/\@unixroot/$ENV{'UNIXROOT'}/; # The EMX built perl doesn't know @unixroot.
34 $perllibdir =~ s/\/\@unixroot/$ENV{'UNIXROOT'}/; # The EMX built perl doesn't know @unixroot.
35 unshift @INC, (split '@PATH_SEPARATOR@', $perllibdir);
36}
37
38use Automake::Config;
39use Automake::General;
40use Automake::Configure_ac;
41use Automake::Channels;
42use Automake::XFile;
43use Automake::FileUtils;
44use File::Basename;
45use File::stat;
46use Cwd;
47
48# Note that this isn't pkgdatadir, but a separate directory.
49# Note also that the versioned directory is handled later.
50$acdir = $ENV{'UNIXROOT'}.'@datadir@/aclocal';
51$acdir =~ s/$ENV{'UNIXROOT'}\/\@unixroot/$ENV{'UNIXROOT'}/; # The EMX built perl doesn't know @unixroot.
52$acdir =~ s/\/\@unixroot/$ENV{'UNIXROOT'}/; # The EMX built perl doesn't know @unixroot.
53$default_acdir = $acdir;
54# contains a list of directories, one per line, to be added
55# to the dirlist in addition to $acdir, as if -I had been
56# added to the command line. If acdir has been redirected,
57# we will also check the specified acdir (this is done later).
58$default_dirlist = "$default_acdir/dirlist";
59
60# Some globals.
61
62# configure.ac or configure.in.
63my $configure_ac;
64
65# Output file name.
66$output_file = 'aclocal.m4';
67
68# Modification time of the youngest dependency.
69$greatest_mtime = 0;
70
71# Option --force.
72$force_output = 0;
73
74# Which macros have been seen.
75%macro_seen = ();
76
77# Which files have been seen.
78%file_seen = ();
79
80# Remember the order into which we scanned the files.
81# It's important to output the contents of aclocal.m4 in the opposite order.
82# (Definitions in first files we have scanned should override those from
83# later files. So they must appear last in the output.)
84@file_order = ();
85
86# Map macro names to file names.
87%map = ();
88
89# Ditto, but records the last definition of each macro as returned by --trace.
90%map_traced_defs = ();
91
92# Map file names to file contents.
93%file_contents = ();
94
95# Map file names to included files (transitively closed).
96%file_includes = ();
97
98# How much to say.
99$verbose = 0;
100
101# Matches a macro definition.
102# AC_DEFUN([macroname], ...)
103# or
104# AC_DEFUN(macroname, ...)
105# When macroname is `['-quoted , we accept any character in the name,
106# except `]'. Otherwise macroname stops on the first `]', `,', `)',
107# or `\n' encountered.
108$ac_defun_rx =
109 "(?:AU_ALIAS|A[CU]_DEFUN|AC_DEFUN_ONCE)\\((?:\\[([^]]+)\\]|([^],)\n]+))";
110
111# Matches an AC_REQUIRE line.
112$ac_require_rx = "AC_REQUIRE\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
113
114# Matches an m4_include line
115$m4_include_rx = "(?:m4_)?(s?)include\\((?:\\[([^]]+)\\]|([^],)\n]+))\\)";
116
117
118
119################################################################
120
121# Check macros in acinclude.m4. If one is not used, warn.
122sub check_acinclude ()
123{
124 foreach my $key (keys %map)
125 {
126 # FIXME: should print line number of acinclude.m4.
127 warn ("aclocal: warning: macro `$key' defined in "
128 . "acinclude.m4 but never used\n")
129 if $map{$key} eq 'acinclude.m4' && ! $macro_seen{$key};
130 }
131}
132
133################################################################
134
135# Scan all the installed m4 files and construct a map.
136sub scan_m4_files (@)
137{
138 local (@dirlist) = @_;
139
140 # First, scan configure.ac. It may contain macro definitions,
141 # or may include other files that define macros.
142 &scan_file ($configure_ac, 'aclocal');
143
144 # Then, scan acinclude.m4 if it exists.
145 if (-f 'acinclude.m4')
146 {
147 &scan_file ('acinclude.m4', 'aclocal');
148 }
149
150 # Finally, scan all files in our search path.
151 local ($m4dir);
152 foreach $m4dir (@dirlist)
153 {
154 if (! opendir (DIR, $m4dir))
155 {
156 print STDERR "aclocal: couldn't open directory `$m4dir': $!\n";
157 exit 1;
158 }
159
160 local ($file, $fullfile);
161 # We reverse the directory contents so that foo2.m4 gets
162 # used in preference to foo1.m4.
163 foreach $file (reverse sort grep (! /^\./, readdir (DIR)))
164 {
165 # Only examine .m4 files.
166 next unless $file =~ /\.m4$/;
167
168 # Skip some files when running out of srcdir.
169 next if $file eq 'aclocal.m4';
170
171 $fullfile = File::Spec->canonpath ("$m4dir/$file");
172 &scan_file ($fullfile, 'aclocal');
173 }
174 closedir (DIR);
175 }
176
177 # Construct a new function that does the searching. We use a
178 # function (instead of just evaluating $search in the loop) so that
179 # "die" is correctly and easily propagated if run.
180 my $search = "sub search {\nmy \$found = 0;\n";
181 foreach my $key (reverse sort keys %map)
182 {
183 $search .= ('if (/\b\Q' . $key . '\E(?!\w)/) { & add_macro ("' . $key
184 . '"); $found = 1; }' . "\n");
185 }
186 $search .= "return \$found;\n};\n";
187 eval $search;
188 die "internal error: $@\n search is $search" if $@;
189}
190
191################################################################
192
193# Add a macro to the output.
194sub add_macro ($)
195{
196 local ($macro) = @_;
197
198 # Ignore unknown required macros. Either they are not really
199 # needed (e.g., a conditional AC_REQUIRE), in which case aclocal
200 # should be quiet, or they are needed and Autoconf itself will
201 # complain when we trace for macro usage later.
202 return unless defined $map{$macro};
203
204 print STDERR "aclocal: saw macro $macro\n" if $verbose;
205 $macro_seen{$macro} = 1;
206 &add_file ($map{$macro});
207}
208
209# scan_configure_dep ($file)
210# --------------------------
211# Scan a configure dependency (configure.ac, or separate m4 files)
212# for uses of known macros and AC_REQUIREs of possibly unknown macros.
213# Recursively scan m4_included files.
214my %scanned_configure_dep = ();
215sub scan_configure_dep ($)
216{
217 my ($file) = @_;
218 # Do not scan a file twice.
219 return ()
220 if exists $scanned_configure_dep{$file};
221 $scanned_configure_dep{$file} = 1;
222
223 my $mtime = mtime $file;
224 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
225
226 my $contents = exists $file_contents{$file} ?
227 $file_contents{$file} : contents $file;
228
229 my $line = 0;
230 my @rlist = ();
231 my @ilist = ();
232 foreach (split ("\n", $contents))
233 {
234 ++$line;
235 # Remove comments from current line.
236 s/\bdnl\b.*$//;
237 s/\#.*$//;
238
239 while (/$m4_include_rx/go)
240 {
241 my $ifile = $2 || $3;
242 # Skip missing `sinclude'd files.
243 next if $1 eq 's' && ! -f $ifile;
244 push @ilist, $ifile;
245 }
246
247 while (/$ac_require_rx/go)
248 {
249 push (@rlist, $1 || $2);
250 }
251
252 # The search function is constructed dynamically by
253 # scan_m4_files. The last parenthetical match makes sure we
254 # don't match things that look like macro assignments or
255 # AC_SUBSTs.
256 if (! &search && /(^|\s+)(AM_[A-Z0-9_]+)($|[^\]\)=A-Z0-9_])/)
257 {
258 # Macro not found, but AM_ prefix found.
259 # Make this just a warning, because we do not know whether
260 # the macro is actually used (it could be called conditionally).
261 warn ("aclocal:$file:$line: warning: "
262 . "macro `$2' not found in library\n");
263 }
264 }
265
266 add_macro ($_) foreach (@rlist);
267 &scan_configure_dep ($_) foreach (@ilist);
268}
269
270# Add a file to output.
271sub add_file ($)
272{
273 local ($file) = @_;
274
275 # Only add a file once.
276 return if ($file_seen{$file});
277 $file_seen{$file} = 1;
278
279 scan_configure_dep $file;
280}
281
282# Point to the documentation for underquoted AC_DEFUN only once.
283my $underquoted_manual_once = 0;
284
285# scan_file ($FILE, $WHERE)
286# -------------------------
287# Scan a single M4 file ($FILE), and all files it includes.
288# Return the list of included files.
289# $WHERE is the location to use in the diagnostic if the file
290# does not exist.
291sub scan_file ($$)
292{
293 my ($file, $where) = @_;
294
295 # Do not scan the same file twice.
296 return @$file_includes{$file} if exists $file_includes{$file};
297 # Prevent potential infinite recursion (if two files include each other).
298 return () if exists $file_contents{$file};
299
300 unshift @file_order, $file;
301
302 if (! -e $file)
303 {
304 print STDERR "$where: file `$file' does not exist\n";
305 exit 1;
306 }
307
308 my $fh = new Automake::XFile $file;
309 my $contents = '';
310 my @inc_files = ();
311 my %inc_lines = ();
312 while ($_ = $fh->getline)
313 {
314 # Ignore `##' lines.
315 next if /^##/;
316
317 $contents .= $_;
318
319 while (/$ac_defun_rx/go)
320 {
321 if (! defined $1)
322 {
323 print STDERR "$file:$.: warning: underquoted definition of $2\n";
324 print STDERR " run info '(automake)Extending aclocal'\n"
325 . " or see http://sources.redhat.com/automake/"
326 . "automake.html#Extending-aclocal\n"
327 unless $underquoted_manual_once;
328 $underquoted_manual_once = 1;
329 }
330 my $macro = $1 || $2;
331 if (! defined $map{$macro})
332 {
333 print STDERR "aclocal: found macro $macro in $file: $.\n"
334 if $verbose;
335 $map{$macro} = $file;
336 }
337 else
338 {
339 # Note: we used to give an error here if we saw a
340 # duplicated macro. However, this turns out to be
341 # extremely unpopular. It causes actual problems which
342 # are hard to work around, especially when you must
343 # mix-and-match tool versions.
344 print STDERR "aclocal: ignoring macro $macro in $file: $.\n"
345 if $verbose;
346 }
347 }
348
349 while (/$m4_include_rx/go)
350 {
351 my $ifile = $2 || $3;
352 # Skip missing `sinclude'd files.
353 next if $1 eq 's' && ! -f $ifile;
354 push (@inc_files, $ifile);
355 $inc_lines{$ifile} = $.;
356 }
357 }
358 $file_contents{$file} = $contents;
359
360 # For some reason I don't understand, it does not work
361 # to do `map { scan_file ($_, ...) } @inc_files' below.
362 # With Perl 5.8.2 it undefines @inc_files.
363 my @copy = @inc_files;
364 my @all_inc_files = (@inc_files,
365 map { scan_file ($_, "$file:$inc_lines{$_}") } @copy);
366 $file_includes{$file} = \@all_inc_files;
367 return @all_inc_files;
368}
369
370# strip_redundant_includes (%FILES)
371# ---------------------------------
372# Each key in %FILES is a file that must be present in the output.
373# However some of these files might already include other files in %FILES,
374# so there is no point in including them another time.
375# This removes items of %FILES which are already included by another file.
376sub strip_redundant_includes (%)
377{
378 my %files = @_;
379
380 # Always include acinclude.m4, even if it does not appear to be used.
381 $files{'acinclude.m4'} = 1 if -f 'acinclude.m4';
382 # File included by $configure_ac are redundant.
383 $files{$configure_ac} = 1;
384
385 # Files at the end of @file_order should override those at the beginning,
386 # so it is important to preserve these trailing files. We can remove
387 # a file A if it is going to be output before a file B that includes
388 # file A, not the converse.
389 foreach my $file (reverse @file_order)
390 {
391 next unless exists $files{$file};
392 foreach my $ifile (@{$file_includes{$file}})
393 {
394 next unless exists $files{$ifile};
395 delete $files{$ifile};
396 print STDERR "$ifile is already included by $file\n"
397 if $verbose;
398 }
399 }
400
401 # configure.ac is implicitly included.
402 delete $files{$configure_ac};
403
404 return %files;
405}
406
407sub trace_used_macros ()
408{
409 my %files = map { $map{$_} => 1 } keys %macro_seen;
410 %files = strip_redundant_includes %files;
411
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 $traces .= join (' ', map { "--trace='$_:\$f:\$n:\$1'" } ('AC_DEFUN',
418 'AC_DEFUN_ONCE',
419 'AU_DEFUN',
420 keys %macro_seen));
421
422 print STDERR "aclocal: running $traces $configure_ac\n" if $verbose;
423
424 my $tracefh = new Automake::XFile ("$traces $configure_ac |");
425
426 my %traced = ();
427
428 while ($_ = $tracefh->getline)
429 {
430 chomp;
431 # Stupid, stupid unix guys.
432 #my ($file, $macro, $arg1) = split (/:/);
433 my ($file, $macro, $arg1, $dos) = split (/:/);
434 if (length($file) == 1 && $dos ne '')
435 {
436 $file = $file.":".$macro;
437 $macro = $arg1;
438 $arg1 = $dos;
439 }
440
441 $traced{$macro} = 1 if $macro_seen{$macro};
442
443 $map_traced_defs{$arg1} = $file
444 if ($macro eq 'AC_DEFUN'
445 || $macro eq 'AC_DEFUN_ONCE'
446 || $macro eq 'AU_DEFUN');
447 }
448
449 $tracefh->close;
450
451 return %traced;
452}
453
454sub scan_configure ()
455{
456 # Make sure we include acinclude.m4 if it exists.
457 if (-f 'acinclude.m4')
458 {
459 add_file ('acinclude.m4');
460 }
461 scan_configure_dep ($configure_ac);
462}
463
464################################################################
465
466# Write output.
467sub write_aclocal ($@)
468{
469 my ($output_file, @macros) = @_;
470 my $output = '';
471
472 my %files = ();
473 # Get the list of files containing definitions for the macros used.
474 # (Filter out unused macro definitions with $map_traced_defs. This
475 # can happen when an Autoconf macro is conditionally defined:
476 # aclocal sees the potential definition, but this definition is
477 # actually never processed and the Autoconf implementation is used
478 # instead.)
479 for my $m (@macros)
480 {
481 $files{$map{$m}} = 1 if $map{$m} eq $map_traced_defs{$m};
482 }
483 %files = strip_redundant_includes %files;
484
485 for $file (grep { exists $files{$_} } @file_order)
486 {
487 # Check the time stamp of this file, and all files it includes.
488 for my $ifile ($file, @{$file_includes{$file}})
489 {
490 my $mtime = mtime $ifile;
491 $greatest_mtime = $mtime if $greatest_mtime < $mtime;
492 }
493
494 # If the file to add looks like outside the project, copy it
495 # to the output. The regex catches filenames starting with
496 # things like `/', `\', or `c:\'.
497 if ($file =~ m,^(?:\w:)?[\\/],)
498 {
499 $output .= $file_contents{$file} . "\n";
500 }
501 else
502 {
503 # Otherwise, simply include the file.
504 $output .= "m4_include([$file])\n";
505 }
506 }
507
508 # Nothing to output?!
509 # FIXME: Shouldn't we diagnose this?
510 return if ! length ($output);
511
512 # We used to print `# $output_file generated automatically etc.' But
513 # this creates spurious differences when using autoreconf. Autoreconf
514 # creates aclocal.m4t and then rename it to aclocal.m4, but the
515 # rebuild rules generated by Automake create aclocal.m4 directly --
516 # this would gives two ways to get the same file, with a different
517 # name in the header.
518 $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-
519
520# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
521# 2005 Free Software Foundation, Inc.
522# This file is free software; the Free Software Foundation
523# gives unlimited permission to copy and/or distribute it,
524# with or without modifications, as long as this notice is preserved.
525
526# This program is distributed in the hope that it will be useful,
527# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
528# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
529# PARTICULAR PURPOSE.
530
531$output";
532
533 # We try not to update $output_file unless necessary, because
534 # doing so invalidate Autom4te's cache and therefore slows down
535 # tools called after aclocal.
536 #
537 # We need to overwrite $output_file in the following situations.
538 # * The --force option is in use.
539 # * One of the dependencies is younger.
540 # (Not updating $output_file in this situation would cause
541 # make to call aclocal in loop.)
542 # * The contents of the current file are different from what
543 # we have computed.
544 if (!$force_output
545 && $greatest_mtime < mtime ($output_file)
546 && $output eq contents ($output_file))
547 {
548 print STDERR "aclocal: $output_file unchanged\n" if $verbose;
549 return;
550 }
551
552 print STDERR "aclocal: writing $output_file\n" if $verbose;
553
554 my $out = new Automake::XFile "> $output_file";
555 print $out $output;
556 return;
557}
558
559################################################################
560
561# Print usage and exit.
562sub usage ($)
563{
564 local ($status) = @_;
565
566 print "Usage: aclocal [OPTIONS] ...\n\n";
567 print "\
568Generate `aclocal.m4' by scanning `configure.ac' or `configure.in'
569
570 --acdir=DIR directory holding config files
571 --help print this help, then exit
572 -I DIR add directory to search list for .m4 files
573 --force always update output file
574 --output=FILE put output in FILE (default aclocal.m4)
575 --print-ac-dir print name of directory holding m4 files
576 --verbose don't be silent
577 --version print version number, then exit
578
579Report bugs to <bug-automake\@gnu.org>.\n";
580
581 exit $status;
582}
583
584# Parse command line.
585sub parse_arguments (@)
586{
587 local (@arglist) = @_;
588 local (@dirlist);
589 local ($print_and_exit) = 0;
590
591 while (@arglist)
592 {
593 if ($arglist[0] =~ /^--acdir=(.+)$/)
594 {
595 $acdir = $1;
596 }
597 elsif ($arglist[0] =~/^--output=(.+)$/)
598 {
599 $output_file = $1;
600 }
601 elsif ($arglist[0] eq '-I')
602 {
603 shift (@arglist);
604 push (@dirlist, $arglist[0]);
605 }
606 elsif ($arglist[0] eq '--print-ac-dir')
607 {
608 $print_and_exit = 1;
609 }
610 elsif ($arglist[0] eq '--force')
611 {
612 $force_output = 1;
613 }
614 elsif ($arglist[0] eq '--verbose')
615 {
616 ++$verbose;
617 }
618 elsif ($arglist[0] eq '--version')
619 {
620 print "aclocal (GNU $PACKAGE) $VERSION\n";
621 print "Written by Tom Tromey <tromey\@redhat.com>\n\n";
622 print "Copyright (C) 2005 Free Software Foundation, Inc.\n";
623 print "This is free software; see the source for copying conditions. There is NO\n";
624 print "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n";
625 exit 0;
626 }
627 elsif ($arglist[0] eq '--help')
628 {
629 &usage (0);
630 }
631 else
632 {
633 print STDERR "aclocal: unrecognized option -- `$arglist[0]'\nTry `aclocal --help' for more information.\n";
634 exit 1;
635 }
636
637 shift (@arglist);
638 }
639
640 if ($print_and_exit)
641 {
642 print $acdir, "\n";
643 exit 0;
644 }
645
646 $default_dirlist="$acdir/dirlist"
647 if $acdir ne $default_acdir;
648
649 # Search the versioned directory near the end, and then the
650 # unversioned directory last. Only do this if the user didn't
651 # override acdir.
652 push (@dirlist, "$acdir-$APIVERSION")
653 if $acdir eq $default_acdir;
654
655 # By default $(datadir)/aclocal doesn't exist. We don't want to
656 # get an error in the case where we are searching the default
657 # directory and it hasn't been created.
658 push (@dirlist, $acdir)
659 unless $acdir eq $default_acdir && ! -d $acdir;
660
661 # Finally, adds any directory listed in the `dirlist' file.
662 if (open (DEFAULT_DIRLIST, $default_dirlist))
663 {
664 while (<DEFAULT_DIRLIST>)
665 {
666 # Ignore '#' lines.
667 next if /^#/;
668 # strip off newlines and end-of-line comments
669 s/\s*\#.*$//;
670 chomp ($contents=$_);
671 if (-d $contents )
672 {
673 push (@dirlist, $contents);
674 }
675 }
676 close (DEFAULT_DIRLIST);
677 }
678
679 return @dirlist;
680}
681
682################################################################
683
684local (@dirlist) = parse_arguments (@ARGV);
685$configure_ac = require_configure_ac;
686scan_m4_files (@dirlist);
687scan_configure;
688if (! $exit_code)
689 {
690 my %macro_traced = trace_used_macros;
691 write_aclocal ($output_file, keys %macro_traced);
692 }
693check_acinclude;
694
695exit $exit_code;
696
697### Setup "GNU" style for perl-mode and cperl-mode.
698## Local Variables:
699## perl-indent-level: 2
700## perl-continued-statement-offset: 2
701## perl-continued-brace-offset: 0
702## perl-brace-offset: 0
703## perl-brace-imaginary-offset: 0
704## perl-label-offset: -2
705## cperl-indent-level: 2
706## cperl-brace-offset: 0
707## cperl-continued-brace-offset: 0
708## cperl-label-offset: -2
709## cperl-extra-newline-before-brace: t
710## cperl-merge-trailing-else: nil
711## cperl-continued-statement-offset: 2
712## End:
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