2 use File::Basename qw(&basename &dirname);
8 my $file = basename($0, '.PL');
9 $file =~ s!_(pm)$!.$1!i;
11 my $Config_archname = defined($Config{'archname'}) ? $Config{'archname'} : '';
12 my $Config_ver = defined($Config{'version'}) ? $Config{'version'} : '';
13 my @Config_inc_version_list = defined($Config{'inc_version_list'}) ?
14 reverse split / /, $Config{'inc_version_list'} : ();
16 open OUT,">$file" or die "Can't create $file: $!";
18 print "Extracting $file (with variable substitutions)\n";
20 # In this section, perl variables will be expanded during extraction.
21 # You can use $Config{...} to use Configure variables.
23 print OUT <<"!GROK!THIS!";
26 # THIS FILE IS AUTOMATICALLY GENERATED FROM lib_pm.PL.
27 # ANY CHANGES TO THIS FILE WILL BE OVERWRITTEN BY THE NEXT PERL BUILD.
29 my \$archname = "$Config_archname";
30 my \$ver = "$Config_ver";
31 my \@inc_version_list = qw(@Config_inc_version_list);
34 print OUT <<'!NO!SUBS!';
36 our @ORIG_INC = @INC; # take a handy copy of 'original' value
37 our $VERSION = '0.5564';
43 foreach (reverse @_) {
46 Carp::carp("Empty compile time value given to use lib");
50 Carp::carp("Parameter to use lib must be directory, not file");
53 # Add any previous version directories we found at configure time
54 foreach my $incver (@inc_version_list)
56 unshift(@INC, "$_/$incver") if -d "$_/$incver";
58 # Put a corresponding archlib directory infront of $_ if it
59 # looks like $_ has an archlib directory below it.
60 unshift(@INC, "$_/$archname") if -d "$_/$archname/auto";
61 unshift(@INC, "$_/$ver") if -d "$_/$ver";
62 unshift(@INC, "$_/$ver/$archname") if -d "$_/$ver/$archname";
65 # remove trailing duplicates
66 @INC = grep { ++$names{$_} == 1 } @INC;
77 ++$names{"$_/$archname"} if -d "$_/$archname/auto";
78 ++$names{"$_/$ver"} if -d "$_/$ver";
79 ++$names{"$_/$ver/$archname"} if -d "$_/$ver/$archname";
82 # Remove ALL instances of each named directory.
83 @INC = grep { !exists $names{$_} } @INC;
92 lib - manipulate @INC at compile time
102 This is a small simple module which simplifies the manipulation of @INC
105 It is typically used to add extra directories to perl's search path so
106 that later C<use> or C<require> statements will find modules which are
107 not located on perl's default search path.
109 =head2 Adding directories to @INC
111 The parameters to C<use lib> are added to the start of the perl search
116 is I<almost> the same as saying
118 BEGIN { unshift(@INC, LIST) }
120 For each directory in LIST (called $dir here) the lib module also
121 checks to see if a directory called $dir/$archname/auto exists.
122 If so the $dir/$archname directory is assumed to be a corresponding
123 architecture specific directory and is added to @INC in front of $dir.
125 To avoid memory leaks, all trailing duplicate entries in @INC are
128 =head2 Deleting directories from @INC
130 You should normally only add directories to @INC. If you need to
131 delete directories from @INC take care to only delete those which you
132 added yourself or which you are certain are not needed by other modules
133 in your script. Other modules may have added directories which they
134 need for correct operation.
136 The C<no lib> statement deletes all instances of each named directory
139 For each directory in LIST (called $dir here) the lib module also
140 checks to see if a directory called $dir/$archname/auto exists.
141 If so the $dir/$archname directory is assumed to be a corresponding
142 architecture specific directory and is also deleted from @INC.
144 =head2 Restoring original @INC
146 When the lib module is first loaded it records the current value of @INC
147 in an array C<@lib::ORIG_INC>. To restore @INC to that value you
150 @INC = @lib::ORIG_INC;
155 FindBin - optional module which deals with paths relative to the source file.
159 Tim Bunce, 2nd June 1995.
164 close OUT or die "Can't close $file: $!";