3 my $config_pm = $ARGV[0] || 'lib/Config.pm';
4 my $glossary = $ARGV[1] || 'Porting/Glossary';
7 # list names to put first (and hence lookup fastest)
8 @fast = qw(archname osname osvers prefix libs libpth
9 dynamic_ext static_ext extensions dlsrc so
10 sig_name sig_num cc ccflags cppflags
11 privlibexp archlibexp installprivlib installarchlib
12 sharpbang startsh shsharp
15 # names of things which may need to have slashes changed to double-colons
16 @extensions = qw(dynamic_ext static_ext extensions known_extensions);
19 open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n";
22 print CONFIG <<'ENDOFBEG_NOQ', <<"ENDOFBEG";
25 @EXPORT = qw(%Config);
26 @EXPORT_OK = qw(myconfig config_sh config_vars);
28 # Define our own import method to avoid pulling in the full Exporter:
31 @_ = @EXPORT unless @_;
32 my @func = grep {$_ ne '%Config'} @_;
33 local $Exporter::ExportLevel = 1;
34 Exporter::import('Config', @func) if @func;
35 return if @func == @_;
36 my $callpkg = caller(0);
37 *{"$callpkg\::Config"} = \%Config;
42 or die "Perl lib version ($myver) doesn't match executable version (\$])";
44 # This file was created by configpm when Perl was built. Any changes
45 # made to this file will be lost the next time perl is built.
51 @extensions{@extensions} = @extensions;
58 next if m:^#!/bin/sh:;
59 # Catch CONFIGDOTSH=true and PERL_VERSION=n line from Configure.
60 s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/;
62 # grandfather PATCHLEVEL and SUBVERSION and CONFIG
64 if ($k eq 'PERL_VERSION') {
65 push @v_others, "PATCHLEVEL='$v'\n";
67 elsif ($k eq 'PERL_SUBVERSION') {
68 push @v_others, "SUBVERSION='$v'\n";
70 elsif ($k eq 'CONFIGDOTSH') {
71 push @v_others, "CONFIG='$v'\n";
74 # We can delimit things in config.sh with either ' or ".
75 unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
76 push(@non_v, "#$_"); # not a name='value' line
80 if ($in_v) { $val .= $_; }
81 else { ($name,$val) = ($1,$3); }
82 $in_v = $val !~ /$quote\n/;
84 if ($extensions{$name}) { s,/,::,g }
85 if (!$fast{$name}){ push(@v_others, "$name=$quote$val"); next; }
86 push(@v_fast,"$name=$quote$val");
89 foreach(@non_v){ print CONFIG $_ }
92 "my \$config_sh = <<'!END!';\n",
93 join("", @v_fast, sort @v_others),
96 # copy config summary format from the myconfig.SH script
98 print CONFIG "my \$summary = <<'!END!';\n";
100 open(MYCONFIG,"<myconfig.SH") || die "open myconfig.SH failed: $!";
101 1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
102 do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
105 print CONFIG "\n!END!\n", <<'EOT';
106 my $summary_expanded = 0;
109 return $summary if $summary_expanded;
110 $summary =~ s{\$(\w+)}
111 { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge;
112 $summary_expanded = 1;
119 print CONFIG <<'ENDOFEND';
122 # check for cached value (which may be undef so we use exists not defined)
123 return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]});
125 # Search for it in the big string
126 my($value, $start, $marker, $quote_type);
129 # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m);
130 # Check for the common case, ' delimeted
131 $start = index($config_sh, "\n$marker$quote_type");
132 # If that failed, check for " delimited
135 $start = index($config_sh, "\n$marker$quote_type");
137 return undef if ( ($start == -1) && # in case it's first
138 (substr($config_sh, 0, length($marker)) ne $marker) );
140 # It's the very first thing we found. Skip $start forward
141 # and figure out the quote mark after the =.
142 $start = length($marker) + 1;
143 $quote_type = substr($config_sh, $start - 1, 1);
146 $start += length($marker) + 2;
148 $value = substr($config_sh, $start,
149 index($config_sh, "$quote_type\n", $start) - $start);
151 # If we had a double-quote, we'd better eval it so escape
152 # sequences and such can be interpolated. Since the incoming
153 # value is supposed to follow shell rules and not perl rules,
154 # we escape any perl variable markers
155 if ($quote_type eq '"') {
156 $value =~ s/\$/\\\$/g;
157 $value =~ s/\@/\\\@/g;
158 eval "\$value = \"$value\"";
160 #$value = sprintf($value) if $quote_type eq '"';
161 $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}".
162 $_[0]->{$_[1]} = $value; # cache it
170 # my($key) = $config_sh =~ m/^(.*?)=/;
171 substr($config_sh, 0, index($config_sh, '=') );
176 # Find out how the current key's quoted so we can skip to its end.
177 my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1);
178 my $pos = index($config_sh, qq($quote\n), $prevpos) + 2;
179 my $len = index($config_sh, "=", $pos) - $pos;
181 $len > 0 ? substr($config_sh, $pos, $len) : undef;
185 # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m;
186 exists($_[0]->{$_[1]}) or
187 index($config_sh, "\n$_[1]='") != -1 or
188 substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or
189 index($config_sh, "\n$_[1]=\"") != -1 or
190 substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\"";
193 sub STORE { die "\%Config::Config is read-only\n" }
194 sub DELETE { &STORE }
204 my @matches = ($config_sh =~ /^$re=.*\n/mg);
205 @matches ? (print @matches) : print "$re: not found\n";
210 config_re($_), next if /\W/;
211 my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN';
212 $v='undef' unless defined $v;
220 print CONFIG <<'ENDOFSET';
223 my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m;
224 for (split ' ', $value) {
225 ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m;
226 $preconfig{$_} = $v eq 'undef' ? undef : $v;
229 sub TIEHASH { bless {%preconfig} }
232 print CONFIG <<'ENDOFSET';
233 sub TIEHASH { bless {} }
237 print CONFIG <<'ENDOFTAIL';
239 # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
242 tie %Config, 'Config';
249 Config - access Perl configuration information
254 if ($Config{'cc'} =~ /gcc/) {
255 print "built by gcc\n";
258 use Config qw(myconfig config_sh config_vars);
264 config_vars(qw(osname archname));
269 The Config module contains all the information that was available to
270 the C<Configure> program at Perl build time (over 900 values).
272 Shell variables from the F<config.sh> file (written by Configure) are
273 stored in the readonly-variable C<%Config>, indexed by their names.
275 Values stored in config.sh as 'undef' are returned as undefined
276 values. The perl C<exists> function can be used to check if a
277 named variable exists.
283 Returns a textual summary of the major perl configuration values.
284 See also C<-V> in L<perlrun/Switches>.
288 Returns the entire perl configuration information in the form of the
289 original config.sh shell variable assignment script.
291 =item config_vars(@names)
293 Prints to STDOUT the values of the named configuration variable. Each is
294 printed on a separate line in the form:
298 Names which are unknown are output as C<name='UNKNOWN';>.
299 See also C<-V:name> in L<perlrun/Switches>.
305 Here's a more sophisticated example of using %Config:
312 unless($Config{sig_name} && $Config{sig_num}) {
315 my @names = split ' ', $Config{sig_name};
316 @sig_num{@names} = split ' ', $Config{sig_num};
318 $sig_name[$sig_num{$_}] ||= $_;
322 print "signal #17 = $sig_name[17]\n";
323 if ($sig_num{ALRM}) {
324 print "SIGALRM is $sig_num{ALRM}\n";
329 Because this information is not stored within the perl executable
330 itself it is possible (but unlikely) that the information does not
331 relate to the actual perl binary which is being used to access it.
333 The Config module is installed into the architecture and version
334 specific library directory ($Config{installarchlib}) and it checks the
335 perl version number when loaded.
337 The values stored in config.sh may be either single-quoted or
338 double-quoted. Double-quoted strings are handy for those cases where you
339 need to include escape sequences in the strings. To avoid runtime variable
340 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
341 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
342 or C<\@> in double-quoted strings unless you're willing to deal with the
343 consequences. (The slashes will end up escaped and the C<$> or C<@> will
344 trigger variable interpolation)
348 Most C<Config> variables are determined by the C<Configure> script
349 on platforms supported by it (which is most UNIX platforms). Some
350 platforms have custom-made C<Config> variables, and may thus not have
351 some of the variables described below, or may have extraneous variables
352 specific to that particular port. See the port specific documentation
357 open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
363 s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m;
364 my $c = substr $1, 0, 1;
365 unless ($seen{$c}++) {
366 print CONFIG <<EOF if $text;
378 s/n't/n\00t/g; # leave can't, won't etc untouched
379 s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
380 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
381 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
382 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
383 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
385 (?<! [\w./<\'\"] ) # Only standalone file names
386 (?! e \. g \. ) # Not e.g.
387 (?! \. \. \. ) # Not ...
389 ( [\w./]* [./] [\w./]* ) # Require . or / inside
390 (?<! \. (?= \s ) ) # Do not include trailing dot
391 (?! [\w/] ) # Include all of it
393 (F<$1>)xg; # /usr/local
394 s/((?<=\s)~\w*)/F<$1>/g; # ~name
395 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
396 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
397 s/n[\0]t/n't/g; # undo can't, won't damage
400 <GLOS>; # Skip the preamble
406 print CONFIG <<'ENDOFTAIL';
412 This module contains a good example of how to use tie to implement a
413 cache and an example of how to make a tied variable readonly to those
423 # Now do some simple tests on the Config.pm file we have created
428 die "$0: $config_pm not valid"
429 unless $Config{'CONFIGDOTSH'} eq 'true';
431 die "$0: error processing $config_pm"
432 if defined($Config{'an impossible name'})
433 or $Config{'CONFIGDOTSH'} ne 'true' # test cache
436 die "$0: error processing $config_pm"
437 if eval '$Config{"cc"} = 1'
438 or eval 'delete $Config{"cc"}'