2 use File::Basename qw(&basename &dirname);
8 my $file = basename($0, '.PL');
9 $file =~ s!_(pm)$!.$1!i;
14 my $Config_inc_version_list;
16 # Expand the variables only if explicitly requested because
17 # otherwise relocating Perl becomes much harder.
19 if ($ENV{PERL_BUILD_EXPAND_CONFIG_VARS}) {
21 $Config_archname = qq('$Config{archname}');
22 $Config_version = qq('$Config{version}');
23 my @Config_inc_version_list =
24 reverse split / /, $Config{inc_version_list};
25 $Config_inc_version_list =
26 @Config_inc_version_list ?
27 qq(@Config_inc_version_list) : q(());
29 $useConfig = 'use Config;';
30 $Config_archname = q($Config{archname});
31 $Config_version = q($Config{version});
32 $Config_inc_version_list =
33 q(reverse split / /, $Config{inc_version_list});
36 open OUT,">$file" or die "Can't create $file: $!";
38 print "Extracting $file (with variable substitutions)\n";
40 # In this section, perl variables will be expanded during extraction.
41 # You can use $Config{...} to use Configure variables.
43 print OUT <<"!GROK!THIS!";
46 # THIS FILE IS AUTOMATICALLY GENERATED FROM lib_pm.PL.
47 # ANY CHANGES TO THIS FILE WILL BE OVERWRITTEN BY THE NEXT PERL BUILD.
53 my \$archname = $Config_archname;
54 my \$version = $Config_version;
55 my \@inc_version_list = $Config_inc_version_list;
58 print OUT <<'!NO!SUBS!';
60 our @ORIG_INC = @INC; # take a handy copy of 'original' value
61 our $VERSION = '0.56';
62 my $Is_MacOS = $^O eq 'MacOS';
66 $Mac_FS = eval { require Mac::FileSpec::Unixish };
73 foreach (reverse @_) {
74 my $path = $_; # we'll be modifying it, so break the alias
77 Carp::carp("Empty compile time value given to use lib");
80 $path = _nativize($path);
82 if ($path !~ /\.par$/i && -e $path && ! -d _) {
84 Carp::carp("Parameter to use lib must be directory, not file");
87 # Add any previous version directories we found at configure time
88 foreach my $incver (@inc_version_list)
91 ? File::Spec->catdir( $path, $incver )
93 unshift(@INC, $dir) if -d $dir;
95 # Put a corresponding archlib directory in front of $path if it
96 # looks like $path has an archlib directory below it.
97 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
99 unshift(@INC, $arch_dir) if -d $arch_auto_dir;
100 unshift(@INC, $version_dir) if -d $version_dir;
101 unshift(@INC, $version_arch_dir) if -d $version_arch_dir;
104 # remove trailing duplicates
105 @INC = grep { ++$names{$_} == 1 } @INC;
115 my $path = _nativize($_);
117 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
120 ++$names{$arch_dir} if -d $arch_auto_dir;
121 ++$names{$version_dir} if -d $version_dir;
122 ++$names{$version_arch_dir} if -d $version_arch_dir;
125 # Remove ALL instances of each named directory.
126 @INC = grep { !exists $names{$_} } @INC;
132 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
134 # we could use this for all platforms in the future, but leave it
135 # Mac-only for now, until there is more time for testing it.
137 $arch_auto_dir = File::Spec->catdir( $dir, $archname, 'auto' );
138 $arch_dir = File::Spec->catdir( $dir, $archname, );
139 $version_dir = File::Spec->catdir( $dir, $version );
140 $version_arch_dir = File::Spec->catdir( $dir, $version, $archname );
142 $arch_auto_dir = "$dir/$archname/auto";
143 $arch_dir = "$dir/$archname";
144 $version_dir = "$dir/$version";
145 $version_arch_dir = "$dir/$version/$archname";
147 return($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
153 if ($Is_MacOS && $Mac_FS && ! -d $dir) {
154 $dir = Mac::FileSpec::Unixish::nativize($dir);
155 $dir .= ":" unless $dir =~ /:$/;
166 lib - manipulate @INC at compile time
176 This is a small simple module which simplifies the manipulation of @INC
179 It is typically used to add extra directories to perl's search path so
180 that later C<use> or C<require> statements will find modules which are
181 not located on perl's default search path.
183 =head2 Adding directories to @INC
185 The parameters to C<use lib> are added to the start of the perl search
190 is I<almost> the same as saying
192 BEGIN { unshift(@INC, LIST) }
194 For each directory in LIST (called $dir here) the lib module also
195 checks to see if a directory called $dir/$archname/auto exists.
196 If so the $dir/$archname directory is assumed to be a corresponding
197 architecture specific directory and is added to @INC in front of $dir.
199 The current value of C<$archname> can be found with this command:
203 To avoid memory leaks, all trailing duplicate entries in @INC are
206 =head2 Deleting directories from @INC
208 You should normally only add directories to @INC. If you need to
209 delete directories from @INC take care to only delete those which you
210 added yourself or which you are certain are not needed by other modules
211 in your script. Other modules may have added directories which they
212 need for correct operation.
214 The C<no lib> statement deletes all instances of each named directory
217 For each directory in LIST (called $dir here) the lib module also
218 checks to see if a directory called $dir/$archname/auto exists.
219 If so the $dir/$archname directory is assumed to be a corresponding
220 architecture specific directory and is also deleted from @INC.
222 =head2 Restoring original @INC
224 When the lib module is first loaded it records the current value of @INC
225 in an array C<@lib::ORIG_INC>. To restore @INC to that value you
228 @INC = @lib::ORIG_INC;
232 In order to keep lib.pm small and simple, it only works with Unix
233 filepaths. This doesn't mean it only works on Unix, but non-Unix
234 users must first translate their file paths to Unix conventions.
236 # VMS users wanting to put [.stuff.moo] into
237 # their @INC would write
242 In the future, this module will likely use File::Spec for determining
243 paths, as it does now for Mac OS (where Unix-style or Mac-style paths
244 work, and Unix-style paths are converted properly to Mac-style paths
245 before being added to @INC).
249 FindBin - optional module which deals with paths relative to the source file.
253 Tim Bunce, 2nd June 1995.
258 close OUT or die "Can't close $file: $!";