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 = '0.5564';
62 my $Is_MacOS = $^O eq 'MacOS';
66 $Mac_FS = eval { require Mac::FileSpec::Unixish };
73 foreach (reverse @_) {
76 Carp::carp("Empty compile time value given to use lib");
79 local $_ = _nativize($_);
83 Carp::carp("Parameter to use lib must be directory, not file");
86 # Add any previous version directories we found at configure time
87 foreach my $incver (@inc_version_list)
90 ? File::Spec->catdir( $_, $incver )
92 unshift(@INC, $dir) if -d $dir;
94 # Put a corresponding archlib directory in front of $_ if it
95 # looks like $_ has an archlib directory below it.
96 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
98 unshift(@INC, $arch_dir) if -d $arch_auto_dir;
99 unshift(@INC, $version_dir) if -d $version_dir;
100 unshift(@INC, $version_arch_dir) if -d $version_arch_dir;
103 # remove trailing duplicates
104 @INC = grep { ++$names{$_} == 1 } @INC;
114 local $_ = _nativize($_);
116 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
119 ++$names{$arch_dir} if -d $arch_auto_dir;
120 ++$names{$version_dir} if -d $version_dir;
121 ++$names{$version_arch_dir} if -d $version_arch_dir;
124 # Remove ALL instances of each named directory.
125 @INC = grep { !exists $names{$_} } @INC;
131 my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
133 # we could use this for all platforms in the future, but leave it
134 # Mac-only for now, until there is more time for testing it.
136 $arch_auto_dir = File::Spec->catdir( $_, $archname, 'auto' );
137 $arch_dir = File::Spec->catdir( $_, $archname, );
138 $version_dir = File::Spec->catdir( $_, $version );
139 $version_arch_dir = File::Spec->catdir( $_, $version, $archname );
141 $arch_auto_dir = "$_/$archname/auto";
142 $arch_dir = "$_/$archname";
143 $version_dir = "$_/$version";
144 $version_arch_dir = "$_/$version/$archname";
146 return($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
152 if ($Is_MacOS && $Mac_FS && ! -d $dir) {
153 $dir = Mac::FileSpec::Unixish::nativize($dir);
154 $dir .= ":" unless $dir =~ /:$/;
165 lib - manipulate @INC at compile time
175 This is a small simple module which simplifies the manipulation of @INC
178 It is typically used to add extra directories to perl's search path so
179 that later C<use> or C<require> statements will find modules which are
180 not located on perl's default search path.
182 =head2 Adding directories to @INC
184 The parameters to C<use lib> are added to the start of the perl search
189 is I<almost> the same as saying
191 BEGIN { unshift(@INC, LIST) }
193 For each directory in LIST (called $dir here) the lib module also
194 checks to see if a directory called $dir/$archname/auto exists.
195 If so the $dir/$archname directory is assumed to be a corresponding
196 architecture specific directory and is added to @INC in front of $dir.
198 To avoid memory leaks, all trailing duplicate entries in @INC are
201 =head2 Deleting directories from @INC
203 You should normally only add directories to @INC. If you need to
204 delete directories from @INC take care to only delete those which you
205 added yourself or which you are certain are not needed by other modules
206 in your script. Other modules may have added directories which they
207 need for correct operation.
209 The C<no lib> statement deletes all instances of each named directory
212 For each directory in LIST (called $dir here) the lib module also
213 checks to see if a directory called $dir/$archname/auto exists.
214 If so the $dir/$archname directory is assumed to be a corresponding
215 architecture specific directory and is also deleted from @INC.
217 =head2 Restoring original @INC
219 When the lib module is first loaded it records the current value of @INC
220 in an array C<@lib::ORIG_INC>. To restore @INC to that value you
223 @INC = @lib::ORIG_INC;
227 In order to keep lib.pm small and simple, it only works with Unix
228 filepaths. This doesn't mean it only works on Unix, but non-Unix
229 users must first translate their file paths to Unix conventions.
231 # VMS users wanting to put [.stuff.moo] into
232 # their @INC would write
237 In the future, this module will likely use File::Spec for determining
238 paths, as it does now for Mac OS (where Unix-style or Mac-style paths
239 work, and Unix-style paths are converted properly to Mac-style paths
240 before being added to @INC).
244 FindBin - optional module which deals with paths relative to the source file.
248 Tim Bunce, 2nd June 1995.
253 close OUT or die "Can't close $file: $!";