source: for-distributions/trunk/bin/windows/perl/lib/B/makeliblinks@ 14489

use File::Find;
use Config;

if (@ARGV != 2) {
    warn <<"EOT";
Usage: makeliblinks libautodir targetdir
where libautodir is the architecture-dependent auto directory
(e.g. $Config::Config{archlib}/auto).
EOT
    exit 2;
}

my ($libautodir, $targetdir) = @ARGV;

# Calculate relative path prefix from $targetdir to $libautodir
sub relprefix {
    my ($to, $from) = @_;
    my $up;
    for ($up = 0; substr($to, 0, length($from)) ne $from; $up++) {
    $from =~ s(
           [^/]+    (?# a group of non-slashes) 
           /*       (?# maybe with some trailing slashes)
           $        (?# at the end of the path)
                  )()x;
    }
    return (("../" x $up) . substr($to, length($from)));
}

my $relprefix = relprefix($libautodir, $targetdir);

my ($dlext, $lib_ext) = @Config::Config{qw(dlext lib_ext)};

sub link_if_library {
    if (/\.($dlext|$lib_ext)$/o) {
    my $ext = $1;
    my $name = $File::Find::name;
    if (substr($name, 0, length($libautodir) + 1) ne "$libautodir/") {
        die "directory of $name doesn't match $libautodir\n";
    }
    substr($name, 0, length($libautodir) + 1) = '';
    my @parts = split(m(/), $name);
    if ($parts[-1] ne "$parts[-2].$ext") {
        die "module name $_ doesn't match its directory $libautodir\n";
    }
    pop @parts;
    my $libpath = "$targetdir/lib" . join("__", @parts) . ".$ext";
    print "$libpath -> $relprefix/$name\n";
    symlink("$relprefix/$name", $libpath)
        or warn "above link failed with error: $!\n";
    }
}

find(\&link_if_library, $libautodir);
exit 0;