File: make_ext.pl

package info (click to toggle)
perl 5.24.1-3+deb9u5
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 103,716 kB
  • sloc: perl: 559,611; ansic: 293,886; sh: 67,316; pascal: 7,632; cpp: 3,895; makefile: 2,436; xml: 2,410; yacc: 989; sed: 6; lisp: 1
file content (745 lines) | stat: -rw-r--r-- 25,484 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
#!./miniperl
use strict;
use warnings;
use Config;
use constant{IS_CROSS => defined $Config::Config{usecrosscompile} ? 1 : 0,
             IS_WIN32 => $^O eq 'MSWin32',
             IS_VMS   => $^O eq 'VMS',
             IS_UNIX  => $^O ne 'MSWin32' && $^O ne 'VMS',
};

my @ext_dirs = qw(cpan dist ext);
my $ext_dirs_re = '(?:' . join('|', @ext_dirs) . ')';

# This script acts as a simple interface for building extensions.

# It's actually a cut and shut of the Unix version ext/utils/makeext and the
# Windows version win32/build_ext.pl hence the two invocation styles.

# On Unix, it primarily used by the perl Makefile one extension at a time:
#
# d_dummy $(dynamic_ext): miniperl preplibrary FORCE
# 	@$(RUN) ./miniperl make_ext.pl --target=dynamic $@ MAKE=$(MAKE) LIBPERL_A=$(LIBPERL)
#
# On Windows or VMS,
# If '--static' is specified, static extensions will be built.
# If '--dynamic' is specified, dynamic extensions will be built.
# If '--nonxs' is specified, nonxs extensions will be built.
# If '--dynaloader' is specified, DynaLoader will be built.
# If '--all' is specified, all extensions will be built.
#
#    make_ext.pl "MAKE=make [-make_opts]" --dir=directory [--target=target] [--static|--dynamic|--all] +ext2 !ext1
#
# E.g.
# 
#     make_ext.pl "MAKE=nmake -nologo" --dir=..\ext
# 
#     make_ext.pl "MAKE=nmake -nologo" --dir=..\ext --target=clean
# 
#     make_ext.pl MAKE=dmake --dir=..\ext
# 
#     make_ext.pl MAKE=dmake --dir=..\ext --target=clean
# 
# Will skip building extensions which are marked with an '!' char.
# Mostly because they still not ported to specified platform.
# 
# If any extensions are listed with a '+' char then only those
# extensions will be built, but only if they aren't countermanded
# by an '!ext' and are appropriate to the type of building being done.
# An extensions follows the format of Foo/Bar, which would be extension Foo::Bar

# It may be deleted in a later release of perl so try to
# avoid using it for other purposes.

my (%excl, %incl, %opts, @extspec, @pass_through, $verbose);

foreach (@ARGV) {
    if (/^!(.*)$/) {
	$excl{$1} = 1;
    } elsif (/^\+(.*)$/) {
	$incl{$1} = 1;
    } elsif (/^--verbose$/ or /^-v$/) {
	$verbose = 1;
    } elsif (/^--([\w\-]+)$/) {
	$opts{$1} = 1;
    } elsif (/^--([\w\-]+)=(.*)$/) {
	push @{$opts{$1}}, $2;
    } elsif (/=/) {
	push @pass_through, $_;
    } elsif (length) {
	push @extspec, $_;
    }
}

my $static = $opts{static} || $opts{all};
my $dynamic = $opts{dynamic} || $opts{all};
my $nonxs = $opts{nonxs} || $opts{all};
my $dynaloader = $opts{dynaloader} || $opts{all};

# The Perl Makefile.SH will expand all extensions to
#	lib/auto/X/X.a  (or lib/auto/X/Y/Y.a if nested)
# A user wishing to run make_ext might use
#	X (or X/Y or X::Y if nested)

# canonise into X/Y form (pname)

foreach (@extspec) {
    if (s{^lib/auto/}{}) {
	# Remove lib/auto prefix and /*.* suffix
	s{/[^/]+\.[^/]+$}{};
    } elsif (s{^$ext_dirs_re/}{}) {
	# Remove ext/ prefix and /pm_to_blib suffix
	s{/pm_to_blib$}{};
	# Targets are given as files on disk, but the extension spec is still
	# written using /s for each ::
	tr!-!/!;
    } elsif (s{::}{\/}g) {
	# Convert :: to /
    } else {
	s/\..*o//;
    }
}

my $makecmd  = shift @pass_through; # Should be something like MAKE=make
unshift @pass_through, 'PERL_CORE=1';

my @dirs  = @{$opts{dir} || \@ext_dirs};
my $target   = $opts{target}[0];
$target = 'all' unless defined $target;

# Previously, $make was taken from config.sh.  However, the user might
# instead be running a possibly incompatible make.  This might happen if
# the user types "gmake" instead of a plain "make", for example.  The
# correct current value of MAKE will come through from the main perl
# makefile as MAKE=/whatever/make in $makecmd.  We'll be cautious in
# case third party users of this script (are there any?) don't have the
# MAKE=$(MAKE) argument, which was added after 5.004_03.
unless(defined $makecmd and $makecmd =~ /^MAKE=(.*)$/) {
    die "$0:  WARNING:  Please include MAKE=\$(MAKE) in \@ARGV\n";
}

# This isn't going to cope with anything fancy, such as spaces inside command
# names, but neither did what it replaced. Once there is a use case that needs
# it, please supply patches. Until then, I'm sticking to KISS
my @make = split ' ', $1 || $Config{make} || $ENV{MAKE};


if ($target eq '') {
    die "make_ext: no make target specified (eg all or clean)\n";
} elsif ($target !~ /^(?:all|clean|distclean|realclean|veryclean)$/) {
    # we are strict about what make_ext is used for because we emulate these
    # targets for simple modules:
    die "$0: unknown make target '$target'\n";
}

if (!@extspec and !$static and !$dynamic and !$nonxs and !$dynaloader)  {
    die "$0: no extension specified\n";
}

my $perl;
my %extra_passthrough;

if (IS_WIN32) {
    require Cwd;
    require FindExt;
    my $build = Cwd::getcwd();
    $perl = $^X;
    if ($perl =~ m#^\.\.#) {
	my $here = $build;
	$here =~ s{/}{\\}g;
	$perl = "$here\\$perl";
    }
    (my $topdir = $perl) =~ s/\\[^\\]+$//;
    # miniperl needs to find perlglob and pl2bat
    $ENV{PATH} = "$topdir;$topdir\\win32\\bin;$ENV{PATH}";
    my $pl2bat = "$topdir\\win32\\bin\\pl2bat";
    unless (-f "$pl2bat.bat") {
	my @args = ($perl, "-I$topdir\\lib", ("$pl2bat.pl") x 2);
	print "@args\n" if $verbose;
	system(@args) unless IS_CROSS;
    }

    print "In $build" if $verbose;
    foreach my $dir (@dirs) {
	chdir($dir) or die "Cannot cd to $dir: $!\n";
	(my $ext = Cwd::getcwd()) =~ s{/}{\\}g;
	FindExt::scan_ext($ext);
	FindExt::set_static_extensions(split ' ', $Config{static_ext});
	chdir $build
	    or die "Couldn't chdir to '$build': $!"; # restore our start directory
    }

    my @ext;
    push @ext, FindExt::static_ext() if $static;
    push @ext, FindExt::dynamic_ext() if $dynamic;
    push @ext, FindExt::nonxs_ext() if $nonxs;
    push @ext, 'DynaLoader' if $dynaloader;

    foreach (sort @ext) {
	if (%incl and !exists $incl{$_}) {
	    #warn "Skipping extension $_, not in inclusion list\n";
	    next;
	}
	if (exists $excl{$_}) {
	    warn "Skipping extension $_, not ported to current platform";
	    next;
	}
	push @extspec, $_;
	if($_ ne 'DynaLoader' && FindExt::is_static($_)) {
	    push @{$extra_passthrough{$_}}, 'LINKTYPE=static';
	}
    }

    chdir '..'
	or die "Couldn't chdir to build directory: $!"; # now in the Perl build
}
elsif (IS_VMS) {
    $perl = $^X;
    push @extspec, (split ' ', $Config{static_ext}) if $static;
    push @extspec, (split ' ', $Config{dynamic_ext}) if $dynamic;
    push @extspec, (split ' ', $Config{nonxs_ext}) if $nonxs;
    push @extspec, 'DynaLoader' if $dynaloader;
}

{
    # Cwd needs to be built before Encode recurses into subdirectories.
    # Pod::Simple needs to be built before Pod::Functions
    # This seems to be the simplest way to ensure this ordering:
    my (@first, @other);
    foreach (@extspec) {
	if ($_ eq 'Cwd' || $_ eq 'Pod/Simple') {
	    push @first, $_;
	} else {
	    push @other, $_;
	}
    }
    @extspec = (@first, @other);
}

if ($Config{osname} eq 'catamount' and @extspec) {
    # Snowball's chance of building extensions.
    die "This is $Config{osname}, not building $extspec[0], sorry.\n";
}
$ENV{PERL_CORE} = 1;

foreach my $spec (@extspec)  {
    my $mname = $spec;
    $mname =~ s!/!::!g;
    my $ext_pathname;

    # Try new style ext/Data-Dumper/ first
    my $copy = $spec;
    $copy =~ tr!/!-!;

    # List/Util.xs lives in Scalar-List-Utils, Cwd.xs lives in PathTools
    $copy = 'Scalar-List-Utils' if $copy eq 'List-Util';
    $copy = 'PathTools'         if $copy eq 'Cwd';

    foreach my $dir (@ext_dirs) {
	if (-d "$dir/$copy") {
	    $ext_pathname = "$dir/$copy";
	    last;
	}
    }

    if (!defined $ext_pathname) {
	if (-d "ext/$spec") {
	    # Old style ext/Data/Dumper/
	    $ext_pathname = "ext/$spec";
	} else {
	    warn "Can't find extension $spec in any of @ext_dirs";
	    next;
	}
    }

    print "\tMaking $mname ($target)\n" if $verbose;

    build_extension($ext_pathname, $perl, $mname, $target,
		    [@pass_through, @{$extra_passthrough{$spec} || []}]);
}

sub build_extension {
    my ($ext_dir, $perl, $mname, $target, $pass_through) = @_;

    unless (chdir "$ext_dir") {
	warn "Cannot cd to $ext_dir: $!";
	return;
    }

    my $up = $ext_dir;
    $up =~ s![^/]+!..!g;

    $perl ||= "$up/miniperl";
    my $return_dir = $up;
    my $lib_dir = "$up/lib";

    my ($makefile, $makefile_no_minus_f);
    if (IS_VMS) {
	$makefile = 'descrip.mms';
	if ($target =~ /clean$/
	    && !-f $makefile
	    && -f "${makefile}_old") {
	    $makefile = "${makefile}_old";
	}
    } else {
	$makefile = 'Makefile';
    }
    
    if (-f $makefile) {
	$makefile_no_minus_f = 0;
	open my $mfh, $makefile or die "Cannot open $makefile: $!";
	while (<$mfh>) {
	    # Plagiarised from CPAN::Distribution
	    last if /MakeMaker post_initialize section/;
	    next unless /^#\s+VERSION_FROM\s+=>\s+(.+)/;
	    my $vmod = eval $1;
	    my $oldv;
	    while (<$mfh>) {
		next unless /^XS_VERSION = (\S+)/;
		$oldv = $1;
		last;
	    }
	    last unless defined $oldv;
	    require ExtUtils::MM_Unix;
	    defined (my $newv = parse_version MM $vmod) or last;
	    if ($newv ne $oldv) {
		close $mfh or die "close $makefile: $!";
		_unlink($makefile);
		{
		    no warnings 'deprecated';
		    goto NO_MAKEFILE;
		}
	    }
	}

        if (IS_CROSS) {
            # If we're cross-compiling, it's possible that the host's
            # Makefiles are around.
            seek($mfh, 0, 0) or die "Cannot seek $makefile: $!";
            
            my $cross_makefile;
            while (<$mfh>) {
                # XXX This might not be throughout enough.
                # For example, it's possible to cause a false-positive
                # if cross compiling on and for the Raspberry Pi,
                # which is insane but plausible.
                # False positives are really not troublesome, though;
                # all they mean is that the module gets rebuilt.
                if (/^CC = \Q$Config{cc}\E/) {
                    $cross_makefile = 1;
                    last;
                }
            }
            
            if (!$cross_makefile) {
                print "Deleting non-Cross makefile\n";
                close $mfh or die "close $makefile: $!";
                _unlink($makefile);
            }
        }
    } else {
	$makefile_no_minus_f = 1;
    }

    if ($makefile_no_minus_f || !-f $makefile) {
	NO_MAKEFILE:
	if (!-f 'Makefile.PL') {
            unless (just_pm_to_blib($target, $ext_dir, $mname, $return_dir)) {
                # No problems returned, so it has faked everything for us. :-)
                chdir $return_dir || die "Cannot cd to $return_dir: $!";
                return;
            }

	    print "\nCreating Makefile.PL in $ext_dir for $mname\n" if $verbose;
	    my ($fromname, $key, $value);

	    $key = 'ABSTRACT_FROM';
	    # We need to cope well with various possible layouts
	    my @dirs = split /::/, $mname;
	    my $leaf = pop @dirs;
	    my $leafname = "$leaf.pm";
	    my $pathname = join '/', @dirs, $leafname;
	    my @locations = ($leafname, $pathname, "lib/$pathname");
	    foreach (@locations) {
		if (-f $_) {
		    $fromname = $_;
		    last;
		}
	}

	unless ($fromname) {
	    die "For $mname tried @locations in $ext_dir but can't find source";
	}
	($value = $fromname) =~ s/\.pm\z/.pod/;
	$value = $fromname unless -e $value;

            if ($mname eq 'Pod::Checker') {
                # the abstract in the .pm file is unparseable by MM,
                # so special-case it. We can't use the package's own
                # Makefile.PL, as it doesn't handle the executable scripts
                # right.
                $key = 'ABSTRACT';
                # this is copied from the CPAN Makefile.PL v 1.171
                $value = 'Pod::Checker verifies POD documentation contents for compliance with the POD format specifications';
            }

	    open my $fh, '>', 'Makefile.PL'
		or die "Can't open Makefile.PL for writing: $!";
	    printf $fh <<'EOM', $0, $mname, $fromname, $key, $value;
#-*- buffer-read-only: t -*-

# This Makefile.PL was written by %s.
# It will be deleted automatically by make realclean

use strict;
use ExtUtils::MakeMaker;

# This is what the .PL extracts to. Not the ultimate file that is installed.
# (ie Win32 runs pl2bat after this)

# Doing this here avoids all sort of quoting issues that would come from
# attempting to write out perl source with literals to generate the arrays and
# hash.
my @temps = 'Makefile.PL';
foreach (glob('scripts/pod*.PL')) {
    # The various pod*.PL extractors change directory. Doing that with relative
    # paths in @INC breaks. It seems the lesser of two evils to copy (to avoid)
    # the chdir doing anything, than to attempt to convert lib paths to
    # absolute, and potentially run into problems with quoting special
    # characters in the path to our build dir (such as spaces)
    require File::Copy;

    my $temp = $_;
    $temp =~ s!scripts/!!;
    File::Copy::copy($_, $temp) or die "Can't copy $temp to $_: $!";
    push @temps, $temp;
}

my $script_ext = $^O eq 'VMS' ? '.com' : '';
my %%pod_scripts;
foreach (glob('pod*.PL')) {
    my $script = $_;
    s/.PL$/$script_ext/i;
    $pod_scripts{$script} = $_;
}
my @exe_files = values %%pod_scripts;

WriteMakefile(
    NAME          => '%s',
    VERSION_FROM  => '%s',
    %-13s => '%s',
    realclean     => { FILES => "@temps" },
    (%%pod_scripts ? (
        PL_FILES  => \%%pod_scripts,
        EXE_FILES => \@exe_files,
        clean     => { FILES => "@exe_files" },
    ) : ()),
);

# ex: set ro:
EOM
	    close $fh or die "Can't close Makefile.PL: $!";
	    # As described in commit 23525070d6c0e51f:
	    # Push the atime and mtime of generated Makefile.PLs back 4
	    # seconds. In certain circumstances ( on virtual machines ) the
	    # generated Makefile.PL can produce a Makefile that is older than
	    # the Makefile.PL. Altering the atime and mtime backwards by 4
	    # seconds seems to resolve the issue.
	    eval {
        my $ftime = (stat('Makefile.PL'))[9] - 4;
        utime $ftime, $ftime, 'Makefile.PL';
	    };
        } elsif ($mname =~ /\A(?:Carp
                            |ExtUtils::CBuilder
                            |Safe
                            |Search::Dict)\z/x) {
            # An explicit list of dual-life extensions that have a Makefile.PL
            # for CPAN, but we have verified can also be built using the fakery.
            my ($problem) = just_pm_to_blib($target, $ext_dir, $mname, $return_dir);
            # We really need to sanity test that we can fake it.
            # Otherwise "skips" will go undetected, and the build slow down for
            # everyone, defeating the purpose.
            if (defined $problem) {
                if (-d "$return_dir/.git") {
                    # Get the list of files that git isn't ignoring:
                    my @files = `git ls-files --cached --others --exclude-standard 2>/dev/null`;
                    # on error (eg no git) we get nothing, but that's not a
                    # problem. The goal is to see if git thinks that the problem
                    # file is interesting, by getting a positive match with
                    # something git told us about, and if so bail out:
                    foreach (@files) {
                        chomp;
                        # We really need to sanity test that we can fake it.
                        # The intent is that this should only fail because
                        # you've just added a file to the dual-life dist that
                        # we can't handle. In which case you should either
                        # 1) remove the dist from the regex a few lines above.
                        # or
                        # 2) add the file to regex of "safe" filenames earlier
                        #    in this function, that starts with ChangeLog
                        die "FATAL - $0 has $mname in the list of simple extensions, but it now contains file '$problem' which we can't handle"
                            if $problem eq $_;
                    }
                    # There's an unexpected file, but it seems to be something
                    # that git will ignore. So fall through to the regular
                    # Makefile.PL handling code below, on the assumption that
                    # we won't get here for a clean build.
                }
                warn "WARNING - $0 is building $mname using EU::MM, as it found file '$problem'";
            } else {
                # It faked everything for us.
                chdir $return_dir || die "Cannot cd to $return_dir: $!";
                return;
            }
	}

        # We are going to have to use Makefile.PL:
	print "\nRunning Makefile.PL in $ext_dir\n" if $verbose;

	my @args = ("-I$lib_dir", 'Makefile.PL');
	if (IS_VMS) {
	    my $libd = VMS::Filespec::vmspath($lib_dir);
	    push @args, "INST_LIB=$libd", "INST_ARCHLIB=$libd";
	} else {
	    push @args, 'INSTALLDIRS=perl', 'INSTALLMAN1DIR=none',
		'INSTALLMAN3DIR=none';
	}
	push @args, @$pass_through;
	_quote_args(\@args) if IS_VMS;
	print join(' ', $perl, @args), "\n" if $verbose;
	my $code = do {
	   local $ENV{PERL_MM_USE_DEFAULT} = 1;
	    system $perl, @args;
	};
	if($code != 0){
	    #make sure next build attempt/run of make_ext.pl doesn't succeed
	    _unlink($makefile);
	    die "Unsuccessful Makefile.PL($ext_dir): code=$code";
	}

	# Right. The reason for this little hack is that we're sitting inside
	# a program run by ./miniperl, but there are tasks we need to perform
	# when the 'realclean', 'distclean' or 'veryclean' targets are run.
	# Unfortunately, they can be run *after* 'clean', which deletes
	# ./miniperl
	# So we do our best to leave a set of instructions identical to what
	# we would do if we are run directly as 'realclean' etc
	# Whilst we're perfect, unfortunately the targets we call are not, as
	# some of them rely on a $(PERL) for their own distclean targets.
	# But this always used to be a problem with the old /bin/sh version of
	# this.
	if (IS_UNIX) {
	    foreach my $clean_target ('realclean', 'veryclean') {
                fallback_cleanup($return_dir, $clean_target, <<"EOS");
cd $ext_dir
if test ! -f Makefile -a -f Makefile.old; then
    echo "Note: Using Makefile.old"
    make -f Makefile.old $clean_target MAKE='@make' @pass_through
else
    if test ! -f Makefile ; then
	echo "Warning: No Makefile!"
    fi
    @make $clean_target MAKE='@make' @pass_through
fi
cd $return_dir
EOS
	    }
	}
    }

    if (not -f $makefile) {
	print "Warning: No Makefile!\n";
    }

    if (IS_VMS) {
	_quote_args($pass_through);
	@$pass_through = (
			  "/DESCRIPTION=$makefile",
			  '/MACRO=(' . join(',',@$pass_through) . ')'
			 );
    }

    my @targ = ($target, @$pass_through);
    print "Making $target in $ext_dir\n@make @targ\n" if $verbose;
    local $ENV{PERL_INSTALL_QUIET} = 1;
    my $code = system(@make, @targ);
    if($code >> 8 != 0){ # probably cleaned itself, try again once more time
        $code = system(@make, @targ);
    }
    die "Unsuccessful make($ext_dir): code=$code" if $code != 0;

    chdir $return_dir || die "Cannot cd to $return_dir: $!";
}

sub _quote_args {
    my $args = shift; # must be array reference

    # Do not quote qualifiers that begin with '/'.
    map { if (!/^\//) {
          $_ =~ s/\"/""/g;     # escape C<"> by doubling
          $_ = q(").$_.q(");
        }
    } @{$args}
    ;
}

#guarentee that a file is deleted or die, void _unlink($filename)
#xxx replace with _unlink_or_rename from EU::Install?
sub _unlink {
    1 while unlink $_[0];
    my $err = $!;
    die "Can't unlink $_[0]: $err" if -f $_[0];
}

# Figure out if this extension is simple enough that it would only use
# ExtUtils::MakeMaker's pm_to_blib target. If we're confident that it would,
# then do all the work ourselves (returning an empty list), else return the
# name of a file that we identified as beyond our ability to handle.
#
# While this is clearly quite a bit more work than just letting
# ExtUtils::MakeMaker do it, and effectively is some code duplication, the time
# savings are impressive.

sub just_pm_to_blib {
    my ($target, $ext_dir, $mname, $return_dir) = @_;
    my ($has_lib, $has_top, $has_topdir);
    my ($last) = $mname =~ /([^:]+)$/;
    my ($first) = $mname =~ /^([^:]+)/;

    my $pm_to_blib = IS_VMS ? 'pm_to_blib.ts' : 'pm_to_blib';
    my $silent = defined $ENV{MAKEFLAGS} && $ENV{MAKEFLAGS} =~ /\b(s|silent|quiet)\b/;

    foreach my $leaf (<*>) {
        if (-d $leaf) {
            $leaf =~ s/\.DIR\z//i
                if IS_VMS;
            next if $leaf =~ /\A(?:\.|\.\.|t|demo)\z/;
            if ($leaf eq 'lib') {
                ++$has_lib;
                next;
            }
            if ($leaf eq $first) {
                ++$has_topdir;
                next;
            }
        }
        return $leaf
            unless -f _;
        $leaf =~ s/\.\z//
            if IS_VMS;
        # Makefile.PL is "safe" to ignore because we will only be called for
        # directories that hold a Makefile.PL if they are in the exception list.
        next
            if $leaf =~ /\A(ChangeLog
                            |Changes
                            |LICENSE
                            |Makefile\.PL
                            |MANIFEST
                            |META\.yml
                            |\Q$pm_to_blib\E
                            |README
                            |README\.patching
                            |README\.release
                            )\z/xi; # /i to deal with case munging systems.
        if ($leaf eq "$last.pm") {
            ++$has_top;
            next;
        }
        return $leaf;
    }
    return 'no lib/'
        unless $has_lib || $has_top;
    die "Inconsistent module $mname has both lib/ and $first/"
        if $has_lib && $has_topdir;

    print "\nRunning pm_to_blib for $ext_dir directly\n"
      unless $silent;

    my %pm;
    if ($has_top) {
        my $to = $mname =~ s!::!/!gr;
        $pm{"$last.pm"} = "../../lib/$to.pm";
    }
    if ($has_lib || $has_topdir) {
        # strictly ExtUtils::MakeMaker uses the pm_to_blib target to install
        # .pm, pod and .pl files. We're just going to do it for .pm and .pod
        # files, to avoid problems on case munging file systems. Specifically,
        # _pm.PL which ExtUtils::MakeMaker should run munges to _PM.PL, and
        # looks a lot like a regular foo.pl (ie FOO.PL)
        my @found;
        require File::Find;
        unless (eval {
            File::Find::find({
                              no_chdir => 1,
                              wanted => sub {
                                  return if -d $_;
                                  # Bail out immediately with the problem file:
                                  die \$_
                                      unless -f _;
                                  die \$_
                                      unless /\A[^.]+\.(?:pm|pod)\z/i;
                                  push @found, $_;
                              }
                             }, $has_lib ? 'lib' : $first);
            1;
        }) {
            # Problem files aren't really errors:
            return ${$@}
                if ref $@ eq 'SCALAR';
            # But anything else is:
            die $@;
        }
        if ($has_lib) {
            $pm{$_} = "../../$_"
                foreach @found;
        } else {
            $pm{$_} = "../../lib/$_"
                foreach @found;
        }
    }
    # This is running under miniperl, so no autodie
    if ($target eq 'all') {
        local $ENV{PERL_INSTALL_QUIET} = 1;
        require ExtUtils::Install;
        ExtUtils::Install::pm_to_blib(\%pm, '../../lib/auto');
        open my $fh, '>', $pm_to_blib
            or die "Can't open '$pm_to_blib': $!";
        print $fh "$0 has handled pm_to_blib directly\n";
        close $fh
            or die "Can't close '$pm_to_blib': $!";
	if (IS_UNIX) {
            # Fake the fallback cleanup
            my $fallback
                = join '', map {s!^\.\./\.\./!!; "rm -f $_\n"} sort values %pm;
            foreach my $clean_target ('realclean', 'veryclean') {
                fallback_cleanup($return_dir, $clean_target, $fallback);
            }
        }
    } else {
        # A clean target.
        # For now, make the targets behave the same way as ExtUtils::MakeMaker
        # does
        _unlink($pm_to_blib);
        unless ($target eq 'clean') {
            # but cheat a bit, by relying on the top level Makefile clean target
            # to take out our directory lib/auto/...
            # (which it has to deal with, as cpan/foo/bar creates
            # lib/auto/foo/bar, but the EU::MM rule will only
            # rmdir lib/auto/foo/bar, leaving lib/auto/foo
            _unlink($_)
                foreach sort values %pm;
        }
    }
    return;
}

sub fallback_cleanup {
    my ($dir, $clean_target, $contents) = @_;
    my $file = "$dir/$clean_target.sh";
    open my $fh, '>>', $file or die "open $file: $!";
    # Quite possible that we're being run in parallel here.
    # Can't use Fcntl this early to get the LOCK_EX
    flock $fh, 2 or warn "flock $file: $!";
    print $fh $contents or die "print $file: $!";
    close $fh or die "close $file: $!";
}