pp_coreargs: rationalise @_ code

[perl5.git] / installperl

#!./perl -w

BEGIN {
    chdir '..' if !-d 'lib' and -d '../lib';
    @INC = 'lib';
    $ENV{PERL5LIB} = 'lib';

    # This needs to be at BEGIN time, before any use of Config
    # install_lib itself loads and imports Config into main::
    require './install_lib.pl';
}

use strict;
use vars qw($Is_VMS $Is_W32 $Is_OS2 $Is_Cygwin $Is_Darwin $Is_NetWare $Is_AmigaOS
	    %opts $packlist);
my $versiononly;

BEGIN {
    if ($Is_VMS) { eval 'use VMS::Filespec;' }
}

# HP-UX (at least) needs to maintain execute permissions
# on dynamically-loadable libraries. So we do it for all.
#
# In AmigaOS, the 0777 means 'rwed' (e = execute, d = delete),
# (not 'rwx') and having the 'd' makes updates more convenient.
my $SO_MODE     = $Is_AmigaOS ? 0777 : 0555;
my $NON_SO_MODE = $Is_AmigaOS ? 0666 : 0444;

my $scr_ext = ($Is_VMS ? '.Com' : $Is_W32 ? '.bat' : '');

use File::Find;
use File::Compare;
use File::Copy ();
use ExtUtils::Packlist;
use Cwd;
# nogetopt_compat to disable treating +v as meaning -v
use Getopt::Long qw(:config nogetopt_compat no_auto_abbrev noignorecase);

require './Porting/pod_lib.pl';

if ($Is_NetWare) {
    $Is_W32 = 0;
    $scr_ext = '.pl';
}

my $mainperldir = "/usr/bin";
my $exe_ext = $Config{exe_ext};

# Allow "make install PERLNAME=something_besides_perl":
my $perl = defined($ENV{PERLNAME}) ? $ENV{PERLNAME} : 'perl';

# This is the base used for versioned names, like "perl5.6.0".
# It's separate because a common use of $PERLNAME is to install
# perl as "perl5", if that's used as base for versioned files you
# get "perl55.6.0".
my $perl_verbase = defined($ENV{PERLNAME_VERBASE})
		    ? $ENV{PERLNAME_VERBASE}
		    : $perl;
my $dbg = '';
my $ndbg = '';
if ( $Is_VMS ) {
    if ( defined $Config{usevmsdebug} ) {
        if ( $Config{usevmsdebug} eq 'define' ) {
            $dbg = 'dbg';
            $ndbg = 'ndbg';
        }
    }
}

# This little hack simplifies making the code after the comment "Fetch some
# frequently-used items from %Config" warning free. With $opts{destdir} always
# defined, it's also possible to make the s/\Q$opts{destdir}\E unconditional.

$opts{destdir} = '';
{
    my $usage = 0;
    if (!GetOptions(\%opts, 'notify|n', 'strip|s', 'silent|S',
                    'skip-otherperls|o', 'force|f', 'verbose|V', 'archname|A',
                    'netware', 'nopods|p', 'destdir:s', 'help|h|?',
                    'versiononly|v' => \$versiononly, '<>' => sub {
                        if ($_[0] eq '+v') {
                            $versiononly = 0;
                        } else {
                            # Any other unknown argument is going to be an error
                            $usage = 1;
                        }
                    },
                   )) {
        $usage = 1;
    }
    $opts{verbose} ||= $opts{notify};

    if ($usage || $opts{help}) {
        print <<"EOT";
Usage $0: [switches]
  -n	    Don't actually run any commands; just print them.
  -s        Run strip on installed binaries.
  -v        Only install perl as a binary with the version number in the name.
            (Override whatever config.sh says)
  +v        Install perl as "perl" and as a binary with the version number in
            the name.  (Override whatever config.sh says)
  -S        Silent mode.
  -f        Force installation (don't check if same version is there)
  -o        Skip checking for other copies of perl in your PATH.
  -V        Verbose mode.
  -A        Also install perl with the architecture's name in the perl binary's
            name.
  -p        Don't install the pod files. [This will break use diagnostics;]
  -netware  Install correctly on a Netware server.
  -destdir  Prefix installation directories by this string.
  -h        Display this help message.
EOT
        exit $usage;
    }
}

$versiononly = 1 if $Config{versiononly} && !defined $versiononly;
my (@scripts, @tolink);
open SCRIPTS, "utils.lst" or die "Can't open utils.lst: $!";
while (<SCRIPTS>) {
    next if /^#/;
    chomp;
    if (/(\S*)\s*#\s*link\s*=\s*(\S*)/) {
	push @scripts, $1;
	push @tolink, [$1, $2];
    } else {
	push @scripts, $_;
    }
}
close SCRIPTS;

if ($scr_ext) { @scripts = map { "$_$scr_ext" } @scripts; }

# Specify here any .pm files that are actually architecture-dependent.
# (Those included with XS extensions under ext/ are automatically
# added later.)
# Now that the default privlib has the full perl version number included,
# we no longer have to play the trick of sticking version-specific .pm
# files under the archlib directory.
my %archpms = (
    Config => 1,
    lib => 1,
);

if ($^O eq 'dos') {
    push(@scripts,'djgpp/fixpmain');
    $archpms{config} = $archpms{filehand} = 1;
}

if ((-e "testcompile") && (defined($ENV{'COMPILE'}))) {
    push(@scripts, map("$_.exe", @scripts));
}

# Exclude nonxs extensions that are not architecture dependent
my @nonxs = grep(!/^Errno$/, split(' ', $Config{'nonxs_ext'}));

my @ext_dirs = qw(cpan dist ext);
foreach my $ext_dir (@ext_dirs) {
    find(sub {
	if (($File::Find::name =~ m{^$ext_dir\b(.*)/([^/]+)\.pm$}) &&
	    ! grep { (my $dir = $_) =~ s/\//-/g;
		     $File::Find::name =~ /^$ext_dir\/$dir\// } @nonxs)
	{
	    my($path, $modname) = ($1,$2);

	    # Change hyphenated name like Filter-Util-Call to nested
	    # directory name Filter/Util/Call
	    $path =~ s{-}{/}g;

	    # strip to optional "/lib", or remove trailing component
	    $path =~ s{.*/lib\b}{} or $path =~ s{/[^/]*$}{};

	    # strip any leading /
	    $path =~ s{^/}{};

	    # reconstitute canonical module name
	    $modname = "$path/$modname" if length $path;

	    # remember it
	    $archpms{$modname} = 1;
	}
    }, $ext_dir);
}

# print "[$_]\n" for sort keys %archpms;

my $ver = $Config{version};
my $release = substr($],0,3);   # Not used currently.
my $patchlevel = substr($],3,2);
die "Patchlevel of perl ($patchlevel)",
    "and patchlevel of config.sh ($Config{'PERL_VERSION'}) don't match\n"
	if $patchlevel != $Config{'PERL_VERSION'};

# Fetch some frequently-used items from %Config
my $installbin = "$opts{destdir}$Config{installbin}";
my $installscript = "$opts{destdir}$Config{installscript}";
my $installprivlib = "$opts{destdir}$Config{installprivlib}";
my $installarchlib = "$opts{destdir}$Config{installarchlib}";
my $installsitelib = "$opts{destdir}$Config{installsitelib}";
my $installsitearch = "$opts{destdir}$Config{installsitearch}";
my $installman1dir = "$opts{destdir}$Config{installman1dir}";
my $man1ext = $Config{man1ext};
my $libperl = $Config{libperl};
# Shared library and dynamic loading suffixes.
my $so = $Config{so};
my $dlext = $Config{dlext};
my $dlsrc = $Config{dlsrc};
if ($^O eq 'os390') {
    my $pwd;
    chomp($pwd=`pwd`);
    my $archlibexp = $Config{archlibexp};
    my $usedl = $Config{usedl};
    if ($usedl eq 'define') {
	`./$^X -pibak -e 's{$pwd\/libperl.x}{$archlibexp/CORE/libperl.x}' lib/Config.pm`;
    }
}

if ($opts{netware}) {
    # This is required only if we are installing on a NetWare server
    $installscript = $Config{installnwscripts};
    $installprivlib = $Config{installnwlib};
    $installarchlib = $Config{installnwlib};
    $installsitelib = $Config{installnwlib};
}

my $binexp = $Config{binexp};

if ($Is_VMS) {  # Hang in there until File::Spec hits the big time
    foreach ( \$installbin,     \$installscript,  \$installprivlib,
	      \$installarchlib, \$installsitelib, \$installsitearch,
	      \$installman1dir ) {
	$$_ = unixify($$_);  $$_ =~ s:/$::;
    }
}

# Do some quick sanity checks.

   $installbin		|| die "No installbin directory in config.sh\n";
-d $installbin	        || mkpath($installbin);
-d $installbin		|| $opts{notify} || die "$installbin is not a directory\n";
-w $installbin		|| $opts{notify} || die "$installbin is not writable by you\n"
	unless $installbin =~ m#^/afs/# || $opts{notify};

if (!$Is_NetWare) {
if (!$Is_VMS) {
-x 'perl' . $exe_ext	|| die "perl isn't executable!\n";
}
else {
-x $ndbg . 'perl' . $exe_ext	|| die "${ndbg}perl$exe_ext isn't executable!\n";
    if ($dbg) {
        -x $dbg . 'perl' . $exe_ext	|| die "${dbg}perl$exe_ext isn't executable!\n";
    }
}

-f 't/rantests'		|| $Is_W32
			|| warn "WARNING: You've never run 'make test' or",
				" some tests failed! (Installing anyway.)\n";
} #if (!$Is_NetWare)

# This will be used to store the packlist
$packlist = ExtUtils::Packlist->new("$installarchlib/.packlist");

if (($Is_W32 and ! $Is_NetWare) or $Is_Cygwin) {
    my $perldll;

    if ($Is_Cygwin) {
	$perldll = $libperl;
    } else {
	$perldll = 'perl5'.$Config{patchlevel}.'.'.$so;
    }

    if ($dlsrc ne "dl_none.xs") {
	-f $perldll || die "No perl DLL built\n";
    }

    # Install the DLL
    safe_unlink("$installbin/$perldll");
    copy("$perldll", "$installbin/$perldll");
    chmod(0755, "$installbin/$perldll");
    $packlist->{"$Config{installbin}/$perldll"} = { type => 'file' };
} # if (($Is_W32 and ! $Is_NetWare) or $Is_Cygwin)

# First we install the version-numbered executables.

if ($Is_VMS) {
    safe_unlink("$installbin/perl_setup.com");
    copy("perl_setup.com", "$installbin/perl_setup.com");
    chmod(0755, "$installbin/perl_setup.com");
    safe_unlink("$installbin/$dbg$perl$exe_ext");
    copy("$dbg$perl$exe_ext", "$installbin/$dbg$perl$exe_ext");
    chmod(0755, "$installbin/$dbg$perl$exe_ext");
    safe_unlink("$installbin/$dbg${perl}shr$exe_ext");
    copy("$dbg${perl}shr$exe_ext", "$installbin/$dbg${perl}shr$exe_ext");
    chmod(0755, "$installbin/$dbg${perl}shr$exe_ext");
    if ($ndbg) {
        safe_unlink("$installbin/$ndbg$perl$exe_ext");
        copy("$ndbg$perl$exe_ext", "$installbin/$ndbg$perl$exe_ext");
        chmod(0755, "$installbin/$ndbg$perl$exe_ext");
    }
}
elsif ($^O ne 'dos') {
    if (!$Is_NetWare) {
	safe_unlink("$installbin/$perl_verbase$ver$exe_ext");
	copy("perl$exe_ext", "$installbin/$perl_verbase$ver$exe_ext");
	strip("$installbin/$perl_verbase$ver$exe_ext");
	chmod(0755, "$installbin/$perl_verbase$ver$exe_ext");
    }
    else {
	# If installing onto a NetWare server
        if ($opts{netware}) {
	    # Copy perl.nlm, echo.nlm, type.nlm & cgi2perl.nlm
            mkpath($Config{installnwsystem});
	    copy("netware\\".$ENV{'MAKE_TYPE'}."\\perl.nlm", $Config{installnwsystem});
	    copy("netware\\testnlm\\echo\\echo.nlm", $Config{installnwsystem});
	    copy("netware\\testnlm\\type\\type.nlm", $Config{installnwsystem});
	    chmod(0755, "$Config{installnwsystem}\\perl.nlm");
            mkpath($Config{installnwlcgi});
	    copy("lib\\auto\\cgi2perl\\cgi2perl.nlm", $Config{installnwlcgi});
	}
    } #if (!$Is_NetWare)
}
else {
    safe_unlink("$installbin/$perl.exe");
    copy("perl.exe", "$installbin/$perl.exe");
}

# Install library files.

my $do_installarchlib = !samepath($installarchlib, 'lib');
my $do_installprivlib = !samepath($installprivlib, 'lib');
my $vershort = ($Is_Cygwin and !$Config{usedevel}) ? substr($ver,0,-2) : $ver;
$do_installprivlib = 0 if $versiononly && !($installprivlib =~ m/\Q$vershort/);

mkpath($installprivlib);
mkpath($installarchlib);
mkpath($installsitelib, $opts{verbose}, 0777) if ($installsitelib);
mkpath($installsitearch, $opts{verbose}, 0777) if ($installsitearch);

if (-d 'lib') {
    find({no_chdir => 1, wanted => \&installlib}, 'lib')
        if $do_installarchlib || $do_installprivlib;
}
else {
    warn "Can't install lib files - 'lib/' does not exist";
}

# Install header files and libraries.
mkpath("$installarchlib/CORE");
my @corefiles;
if ($Is_VMS) {  # We did core file selection during build
    my $coredir = "lib/$Config{archname}/$ver/CORE";
    $coredir =~ tr/./_/;
    map { s|^$coredir/||i; } @corefiles = <$coredir/*.*>;
}
elsif ($Is_Cygwin) { # On Cygwin symlink it to CORE to make Makefile happy
    @corefiles = <*.h libperl*.* perl*$Config{lib_ext}>;
    my $coredll = "$installarchlib/CORE/$libperl";
    my $instcoredll = "$Config{installarchlib}/CORE/$libperl";
    safe_unlink($coredll);
    ( $Config{'d_link'} eq 'define' &&
      eval {
          CORE::link("$installbin/$libperl", $coredll);
          $packlist->{$instcoredll} = { from => "$Config{installbin}/$libperl",
                                    type => 'link' };
      }
    ) ||
    eval {
        symlink("$installbin/$libperl", $coredll);
        $packlist->{$instcoredll} = { from => "$Config{installbin}/$libperl",
                                  type => 'link' };
    } ||
    ( copy("$installbin/$libperl", $coredll) &&
      push(@corefiles, $instcoredll)
    )
} else {
    # [als] hard-coded 'libperl' name... not good!
    @corefiles = <*.h libperl*.* perl*$Config{lib_ext}>;

    # AIX needs perl.exp installed as well.
    push(@corefiles,'perl.exp') if $^O eq 'aix';
}


foreach my $file (@corefiles) {
    if (copy_if_diff($file,"$installarchlib/CORE/$file")) {
	if ($file =~ /\.(\Q$so\E|\Q$dlext\E)$/) {
	    strip("-S", "$installarchlib/CORE/$file") if $^O eq 'darwin';
	    chmod($SO_MODE, "$installarchlib/CORE/$file");
	} else {
	    chmod($NON_SO_MODE, "$installarchlib/CORE/$file");
	}
    }
}

# Install main perl executables
# Make links to ordinary names if installbin directory isn't current directory.

if (! $versiononly && ! samepath($installbin, '.') && ($^O ne 'dos') && ! $Is_VMS && ! $Is_NetWare) {
    safe_unlink("$installbin/$perl$exe_ext", "$installbin/suid$perl$exe_ext");
    if ($^O eq 'vos') {
	# VOS doesn't support hard links, so use a symlink.
	symlink("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$perl$exe_ext");
    } else {
	link("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$perl$exe_ext");
    }
}

# For development purposes it can be very useful to have multiple perls
# build for different "architectures" (eg threading or not) simultaneously.
if ($opts{archname} && ! samepath($installbin, '.') && ($^O ne 'dos') && ! $Is_VMS) {
    my $archperl = "$perl_verbase$ver-$Config{archname}$exe_ext";
    safe_unlink("$installbin/$archperl");
    if ($^O eq 'vos') {
	# VOS doesn't support hard links, so use a symlink.
	symlink("$installbin/$perl_verbase$ver$exe_ext",
		"$installbin/$archperl");
    } else {
	link("$installbin/$perl_verbase$ver$exe_ext", "$installbin/$archperl");
    }
}

# Offer to install perl in a "standard" location

my $mainperl_is_instperl = 0;

if ($Config{installusrbinperl} && $Config{installusrbinperl} eq 'define' &&
    !$versiononly && !$opts{notify} && !$Is_W32 && !$Is_NetWare && !$Is_VMS && -t STDIN && -t STDERR
	&& -w $mainperldir && ! samepath($mainperldir, $installbin)) {
    my($usrbinperl)	= "$mainperldir/$perl$exe_ext";
    my($instperl)	= "$installbin/$perl$exe_ext";
    my($expinstperl)	= "$binexp/$perl$exe_ext";

    # First make sure $usrbinperl is not already the same as the perl we
    # just installed.
    if (-x $usrbinperl) {
	# Try to be clever about mainperl being a symbolic link
	# to binexp/perl if binexp and installbin are different.
	$mainperl_is_instperl =
	    samepath($usrbinperl, $instperl) ||
	    samepath($usrbinperl, $expinstperl) ||
	     (($binexp ne $installbin) &&
	      (-l $usrbinperl) &&
	      ((readlink $usrbinperl) eq $expinstperl));
    }
    if (! $mainperl_is_instperl) {
	unlink($usrbinperl);
	( $Config{'d_link'} eq 'define' &&
	  eval { CORE::link $instperl, $usrbinperl } )	||
	eval { symlink $expinstperl, $usrbinperl }	||
	copy($instperl, $usrbinperl);

	$mainperl_is_instperl = 1;
    }
}

# cppstdin is just a script, but it is architecture-dependent, so
# it can't safely be shared.  Place it in $installbin.
# Note that Configure doesn't build cppstin if it isn't needed, so
# we skip this if cppstdin doesn't exist.
if (! $versiononly && (-f 'cppstdin') && (! samepath($installbin, '.'))) {
    safe_unlink("$installbin/cppstdin");
    copy("cppstdin", "$installbin/cppstdin");
    chmod(0755, "$installbin/cppstdin");
}

sub script_alias {
    my ($installscript, $orig, $alias, $scr_ext) = @_;

    safe_unlink("$installscript/$alias$scr_ext");
    if ($^O eq 'dos' or $Is_VMS or $^O eq 'transit') {
	copy("$installscript/$orig$scr_ext",
	     "$installscript/$alias$scr_ext");
    } elsif ($^O eq 'vos') {
	symlink("$installscript/$orig$scr_ext",
		"$installscript/$alias$scr_ext");
    } else {
	link("$installscript/$orig$scr_ext",
	     "$installscript/$alias$scr_ext");
    }
}

# Install scripts.
mkpath($installscript);
if ($versiononly) {
    for (@scripts) {
	(my $base = $_) =~ s#.*/##;
	$base .= $ver;
	copy($_,    "$installscript/$base");
	chmod(0755, "$installscript/$base");
    }

    for (@tolink) {
	my ($from, $to) = map { "$_$ver" } @$_;
	(my $frbase = $from) =~ s#.*/##;
	(my $tobase = $to) =~ s#.*/##;
	script_alias($installscript, $frbase, $tobase, $scr_ext);
    }
} else {
    for (@scripts) {
	(my $base = $_) =~ s#.*/##;
	copy($_, "$installscript/$base");
	chmod(0755, "$installscript/$base");
	if ($Is_AmigaOS) {
            my $amigapath = unixtoamiga("$installscript/$base");
            amigaprotect($amigapath,"+s");
        }
    }

    for (@tolink) {
	my ($from, $to) = @$_;
	(my $frbase = $from) =~ s#.*/##;
	(my $tobase = $to) =~ s#.*/##;
	script_alias($installscript, $frbase, $tobase, $scr_ext);
    }
}

# Install pod pages.  Where? I guess in $installprivlib/pod
# ($installprivlib/pods for cygwin).
if (!$opts{nopods} && (!$versiononly || ($installprivlib =~ m/\Q$vershort/))) {
    my $pod = ($Is_Cygwin || $Is_Darwin || $Is_VMS || $Is_W32) ? 'pods' : 'pod';
    mkpath("${installprivlib}/$pod");

    for (map {$_->[1]} @{get_pod_metadata()->{master}}) {
	# $_ is a name like  pod/perl.pod
	(my $base = $_) =~ s#.*/##;
	copy_if_diff($_, "${installprivlib}/$pod/${base}");
	chmod(0644, "${installprivlib}/$pod/${base}");
    }

}

# Check to make sure there aren't other perls around in installer's
# path.  This is probably UNIX-specific.  Check all absolute directories
# in the path except for where public executables are supposed to live.
# Also skip $mainperl if the user opted to have it be a link to the
# installed perl.

if (!$versiononly && !$opts{'skip-otherperls'}) {
    my ($path, @path);
    my $dirsep = ($Is_OS2 || $Is_W32 || $Is_NetWare) ? ';' : ':' ;
    ($path = $ENV{"PATH"}) =~ s:\\:/:g ;
    @path = split(/$dirsep/, $path);
    if ($Is_VMS) {
	my $i = 0;
	while (exists $ENV{'DCL$PATH' . $i}) {
	    my $dir = unixpath($ENV{'DCL$PATH' . $i});  $dir =~ s-/$--;
	    push(@path,$dir);
	}
    }
    my @otherperls;
    my %otherperls;
    for (@path) {
	next unless m,^/,;
	# Use &samepath here because some systems have other dirs linked
	# to $mainperldir (like SunOS)
	next unless -d;
	next if samepath($_, $binexp);
	next if samepath($_, cwd());
	next if ($mainperl_is_instperl && samepath($_, $mainperldir));
	my $otherperl = "$_/$perl$exe_ext";
	next if $otherperls{$otherperl}++;
	push(@otherperls, $otherperl)
	    if (-x $otherperl && ! -d $otherperl);
    }
    if (@otherperls) {
	warn "\nWarning: $perl appears in your path in the following " .
	    "locations beyond where\nwe just installed it:\n";
	for (@otherperls) {
	    warn "    ", $_, "\n";
	}
	warn "\n";
    }

}

$packlist->write() unless $opts{notify};
print "  Installation complete\n" if $opts{verbose};

exit 0;

###############################################################################

# If these are needed elsewhere, move them into install_lib.pl rather than
# copying them.

sub yn {
    my($prompt) = @_;
    my($answer);
    my($default) = $prompt =~ m/\[([yn])\]\s*$/i;
    print STDERR $prompt;
    chop($answer = <STDIN>);
    $answer = $default if $answer =~ m/^\s*$/;
    ($answer =~ m/^[yY]/);
}

sub safe_unlink {
    return if $opts{notify} or $Is_VMS;
    my @names = @_;
    foreach my $name (@names) {
	next unless -e $name;
	chmod 0777, $name if ($Is_OS2 || $Is_W32 || $Is_NetWare);
	print "  unlink $name\n" if $opts{verbose};
	next if CORE::unlink($name);
	warn "Couldn't unlink $name: $!\n";
	if ($! =~ /busy/i) {
	    print "  mv $name $name.old\n" if $opts{verbose};
	    safe_rename($name, "$name.old")
		or warn "Couldn't rename $name: $!\n";
	}
    }
}

sub copy {
    my($from,$to) = @_;

    my $xto = $to;
    $xto =~ s/^\Q$opts{destdir}\E//;
    print $opts{verbose} ? "  cp $from $xto\n" : "  $xto\n"
	unless $opts{silent};
    print "  creating new version of $xto\n"
	if $Is_VMS and -e $to and !$opts{silent};
    unless ($opts{notify} or File::Copy::copy($from, $to)) {
	# Might have been that F::C::c can't overwrite the target
	warn "Couldn't copy $from to $to: $!\n"
	    unless -f $to and (chmod(0666, $to), unlink $to)
		   and File::Copy::copy($from, $to);
    }
    $packlist->{$xto} = { type => 'file' };
}

sub installlib {
    my $dir = $File::Find::dir;
    $dir =~ s!\Alib/?!!;

    m!([^/]+)\z!;
    my $name = $1;

    # This remains ugly, and in need of refactoring.

    # $name always starts as the leafname
    # $dir is the directory *within* lib
    # $name later has $dir pre-pended, to give the relative path in lib/
    # which is used to create the path in the target directory.

    # $_ was always the filename to use on disk. Adding no_chdir doesn't change
    # this, as $_ becomes a pathname, and so still works. However, it's not
    # obvious that $_ is needed later, and hence $_ must not be modified.

    # Also, many of the regex exclusion tests below are now superfluous, as the
    # files in question are either no longer in blead, or now in ext/, dist/ or
    # cpan/ and not copied into lib/

    # Ignore version control directories.
    if ($name =~ /^(?:CVS|RCS|SCCS|\.svn)\z/ and -d $name) {
	$File::Find::prune = 1;
	return;
    }

    # ignore patch backups, RCS files, emacs backup & temp files and the
    # .exists files, .PL files, and test files.
    return if $name =~ m{\.orig$|\.rej$|~$|^#.+#$|,v$|^\.exists|\.PL$|\.plc$|\.t$|^test\.pl$|^dbm_filter_util\.pl$|^filter-util\.pl$|^uupacktool\.pl$|^\.gitignore$} ||
	      $dir  =~ m{/t(?:/|$)};
    # ignore the cpan script in lib/CPAN/bin, the instmodsh and xsubpp
    # scripts in lib/ExtUtils, the prove script in lib/Test/Harness,
    # the corelist script from lib/Module/CoreList/bin and ptar* in
    # lib/Archive/Tar/bin and zipdetails in cpan/IO-Compress/bin
    # (they're installed later with other utils)
    return if $name =~ /^(?:cpan|instmodsh|prove|corelist|ptar|ptardiff|ptargrep|zipdetails)\z/;
    # ignore the Makefiles
    return if $name =~ /^makefile$/i;
    # ignore the test extensions, dont install PPPort.so/.dll
    return if $dir =~ m{\b(?:XS/(?:APItest|Typemap)|Devel/PPPort)\b};
    return if $name =~ m{\b(?:APItest|Typemap)\.pm$};
    # ignore the build support code
    return if $name =~ /\bbuildcustomize\.pl$/;
    # ignore the demo files
    return if $dir =~ /\b(?:demos?|eg)\b/;
    # ignore unneeded unicore files
    if ( $dir =~ /^unicore/ ) {
      if ( $name =~ /\.txt\z/ ) {
        # We can ignore most, but not all .txt files
        return unless $name =~ /\A(?:Blocks|SpecialCasing|NamedSequences)\.txt\z/;
      }
      else {
        # TestProp only needed during testing
        return if $name =~ /\ATestProp.pl\z/;
        # we need version and *.pl files and can skip the rest
        return unless $name =~ /\A(?:version|\w+\.p[lm])\z/;
      }
    }

    # ignore READMEs, MANIFESTs, INSTALL docs, META.ymls and change logs.
    # Changes.e2x and README.e2x are needed by enc2xs.
    return if $name =~ m{^(?:README(?:\.\w+)?)$} && $name ne 'README.e2x';
    return if $name =~ m{^(?:MANIFEST|META\.yml)$};
    return if $name =~ m{^(?:INSTALL|TODO|BUGS|CREDITS)$}i;
    return if $name =~ m{^change(?:s|log)(?:\.libnet)?$}i;
    return if $name =~ m{^(?:SIGNATURE|PAUSE200\d\.pub)$}; # CPAN files
    return if $name =~ m{^(?:NOTES|PATCHING)$}; # ExtUtils files

    # if using a shared perl library then ignore:
    # - static library files [of statically linked extensions];
    # - import library files and export library files (only present on Win32
    #   anyway?) and empty bootstrap files [of dynamically linked extensions].
    return if $Config{useshrplib} eq 'true' and
             ($name =~ /$Config{_a}$/ or $name =~ /\.exp$/ or ($name =~ /\.bs$/ and -z $name));

    $name = "$dir/$name" if $dir ne '';

    # ignore pods that are stand alone documentation from dual life modules.
    return if /\.pod\z/ && is_duplicate_pod($_);

    return if $name eq 'ExtUtils/XSSymSet.pm' and !$Is_VMS;

    #blead comes with version, blead isn't 5.8/5.6
    return if $name eq 'ExtUtils/MakeMaker/version/regex.pm';

    my $installlib = $installprivlib;
    if ($dir =~ /^auto\// ||
	  ($name =~ /^(.*)\.(?:pm|pod)$/ && $archpms{$1}) ||
	  ($name =~ /^(.*)\.(?:h|lib)$/i && ($Is_W32 || $Is_NetWare)) ||
	  $name=~/^Config_(heavy|git)\.pl\z/
       ) {
	$installlib = $installarchlib;
	return unless $do_installarchlib;
    } else {
	return unless $do_installprivlib;
    }

    if ($Is_NetWare && !$opts{netware} && /\.(?:nlp|nlm|bs)$/) {
        # Don't copy .nlp,.nlm files, doesn't make sense on Windows and also
        # if copied will give problems when building new extensions.
        # Has to be copied if we are installing on a NetWare server and
        # hence the check !$opts{netware}
        return;
    }

    if (-f $_) {
	my $xname = "$installlib/$name";
	$xname =~ s/^\Q$opts{destdir}\E//;
	$packlist->{$xname} = { type => 'file' };
        if ($opts{force} || compare($_, "$installlib/$name") || $opts{notify}) {
	    unlink("$installlib/$name");
	    mkpath("$installlib/$dir");
	    # HP-UX (at least) needs to maintain execute permissions
	    # on dynamically-loaded libraries.
            if (copy_if_diff($_, "$installlib/$name")) {
                strip("-S", "$installlib/$name")
                    if $^O eq 'darwin' and /\.(?:so|$dlext|a)$/;
                chmod(/\.(so|$dlext)$/ ? $SO_MODE : $NON_SO_MODE,
                      "$installlib/$name");
            }
	}
    }
}

# Copy $from to $to, only if $from is different than $to.
# Also preserve modification times for .a libraries.
# On some systems, if you do
#   ranlib libperl.a
#   cp libperl.a /usr/local/lib/perl5/archlib/CORE/libperl.a
# and then try to link against the installed libperl.a, you might
# get an error message to the effect that the symbol table is older
# than the library.
# Return true if copying occurred.

sub copy_if_diff {
    my($from,$to)=@_;
    return 1 if (($^O eq 'VMS') && (-d $from));
    my $xto = $to;
    $xto =~ s/^\Q$opts{destdir}\E//;
    my $perlpodbadsymlink;
    if ($from =~ m!^pod/perl[\w-]+\.pod$! &&
	-l $from &&
	! -e $from) {
	# Some Linux implementations have problems traversing over
	# multiple symlinks (when going over NFS?) and fail to read
	# the symlink target.  Combine this with the fact that some
	# of the pod files (the perl$OS.pod) are symlinks (to ../README.$OS),
	# and you end up with those pods not getting installed.
	$perlpodbadsymlink = 1;
    }
    -f $from || $perlpodbadsymlink || warn "$0: $from not found";
    $packlist->{$xto} = { type => 'file' };
    if ($opts{force} || compare($from, $to) || $opts{notify}) {
	safe_unlink($to);   # In case we don't have write permissions.
	if ($perlpodbadsymlink && $from =~ m!^pod/perl(.+)\.pod$!) {
	    $from = "README.$1";
	}
	copy($from, $to);
	# Restore timestamps if it's a .a library or for OS/2.
	if (!$opts{notify} && ($Is_OS2 || $to =~ /\.a$/)) {
	    my ($atime, $mtime) = (stat $from)[8,9];
	    utime $atime, $mtime, $to;
	}
	1;
    }
}

sub strip
{
    my(@args) = @_;

    return unless $opts{strip};

    my @opts;
    while (@args && $args[0] =~ /^(-\w+)$/) {
	push @opts, shift @args;
    }

    foreach my $file (@args) {
	if (-f $file) {
	    if ($opts{verbose}) {
		print "  strip " . join(' ', @opts);
		print " " if (@opts);
		print "$file\n";
	    }
	    system("strip", @opts, $file);
	} else {
	    print "# file '$file' skipped\n" if $opts{verbose};
	}
    }
}

# ex: set ts=8 sts=4 sw=4 et: