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";
20 $myver = sprintf "v%vd", $^V;
22 print CONFIG <<'ENDOFBEG_NOQ', <<"ENDOFBEG";
25 @EXPORT = qw(%Config);
26 @EXPORT_OK = qw(myconfig config_sh config_vars);
28 # Define our own import method to avoid pulling in the full Exporter:
31 @_ = @EXPORT unless @_;
32 my @func = grep {$_ 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;
41 die "Perl lib version ($myver) doesn't match executable version (\$])"
45 or die "Perl lib version ($myver) doesn't match executable version (" .
46 (sprintf "v%vd",\$^V) . ")";
48 # This file was created by configpm when Perl was built. Any changes
49 # made to this file will be lost the next time perl is built.
55 @extensions{@extensions} = @extensions;
62 next if m:^#!/bin/sh:;
63 # Catch CONFIGDOTSH=true and PERL_VERSION=n line from Configure.
64 s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/;
66 # grandfather PATCHLEVEL and SUBVERSION and CONFIG
68 if ($k eq 'PERL_VERSION') {
69 push @v_others, "PATCHLEVEL='$v'\n";
71 elsif ($k eq 'PERL_SUBVERSION') {
72 push @v_others, "SUBVERSION='$v'\n";
74 elsif ($k eq 'CONFIGDOTSH') {
75 push @v_others, "CONFIG='$v'\n";
78 # We can delimit things in config.sh with either ' or ".
79 unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
80 push(@non_v, "#$_"); # not a name='value' line
84 if ($in_v) { $val .= $_; }
85 else { ($name,$val) = ($1,$3); }
86 $in_v = $val !~ /$quote\n/;
88 if ($extensions{$name}) { s,/,::,g }
89 if (!$fast{$name}){ push(@v_others, "$name=$quote$val"); next; }
90 push(@v_fast,"$name=$quote$val");
93 foreach(@non_v){ print CONFIG $_ }
96 "my \$config_sh = <<'!END!';\n",
97 join("", @v_fast, sort @v_others),
100 # copy config summary format from the myconfig.SH script
102 print CONFIG "my \$summary = <<'!END!';\n";
104 open(MYCONFIG,"<myconfig.SH") || die "open myconfig.SH failed: $!";
105 1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
106 do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
109 print CONFIG "\n!END!\n", <<'EOT';
110 my $summary_expanded = 0;
113 return $summary if $summary_expanded;
114 $summary =~ s{\$(\w+)}
115 { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge;
116 $summary_expanded = 1;
123 print CONFIG <<'ENDOFEND';
126 # check for cached value (which may be undef so we use exists not defined)
127 return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]});
129 # Search for it in the big string
130 my($value, $start, $marker, $quote_type);
133 # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m);
134 # Check for the common case, ' delimeted
135 $start = index($config_sh, "\n$marker$quote_type");
136 # If that failed, check for " delimited
139 $start = index($config_sh, "\n$marker$quote_type");
141 return undef if ( ($start == -1) && # in case it's first
142 (substr($config_sh, 0, length($marker)) ne $marker) );
144 # It's the very first thing we found. Skip $start forward
145 # and figure out the quote mark after the =.
146 $start = length($marker) + 1;
147 $quote_type = substr($config_sh, $start - 1, 1);
150 $start += length($marker) + 2;
152 $value = substr($config_sh, $start,
153 index($config_sh, "$quote_type\n", $start) - $start);
155 # If we had a double-quote, we'd better eval it so escape
156 # sequences and such can be interpolated. Since the incoming
157 # value is supposed to follow shell rules and not perl rules,
158 # we escape any perl variable markers
159 if ($quote_type eq '"') {
160 $value =~ s/\$/\\\$/g;
161 $value =~ s/\@/\\\@/g;
162 eval "\$value = \"$value\"";
164 #$value = sprintf($value) if $quote_type eq '"';
165 $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}".
166 $_[0]->{$_[1]} = $value; # cache it
174 # my($key) = $config_sh =~ m/^(.*?)=/;
175 substr($config_sh, 0, index($config_sh, '=') );
180 # Find out how the current key's quoted so we can skip to its end.
181 my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1);
182 my $pos = index($config_sh, qq($quote\n), $prevpos) + 2;
183 my $len = index($config_sh, "=", $pos) - $pos;
185 $len > 0 ? substr($config_sh, $pos, $len) : undef;
189 # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m;
190 exists($_[0]->{$_[1]}) or
191 index($config_sh, "\n$_[1]='") != -1 or
192 substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or
193 index($config_sh, "\n$_[1]=\"") != -1 or
194 substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\"";
197 sub STORE { die "\%Config::Config is read-only\n" }
198 sub DELETE { &STORE }
208 my @matches = ($config_sh =~ /^$re=.*\n/mg);
209 @matches ? (print @matches) : print "$re: not found\n";
214 config_re($_), next if /\W/;
215 my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN';
216 $v='undef' unless defined $v;
224 print CONFIG <<'ENDOFSET';
227 my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m;
228 for (split ' ', $value) {
229 ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m;
230 $preconfig{$_} = $v eq 'undef' ? undef : $v;
233 sub TIEHASH { bless {%preconfig} }
236 print CONFIG <<'ENDOFSET';
237 sub TIEHASH { bless {} }
241 print CONFIG <<'ENDOFTAIL';
243 # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
246 tie %Config, 'Config';
253 Config - access Perl configuration information
258 if ($Config{'cc'} =~ /gcc/) {
259 print "built by gcc\n";
262 use Config qw(myconfig config_sh config_vars);
268 config_vars(qw(osname archname));
273 The Config module contains all the information that was available to
274 the C<Configure> program at Perl build time (over 900 values).
276 Shell variables from the F<config.sh> file (written by Configure) are
277 stored in the readonly-variable C<%Config>, indexed by their names.
279 Values stored in config.sh as 'undef' are returned as undefined
280 values. The perl C<exists> function can be used to check if a
281 named variable exists.
287 Returns a textual summary of the major perl configuration values.
288 See also C<-V> in L<perlrun/Switches>.
292 Returns the entire perl configuration information in the form of the
293 original config.sh shell variable assignment script.
295 =item config_vars(@names)
297 Prints to STDOUT the values of the named configuration variable. Each is
298 printed on a separate line in the form:
302 Names which are unknown are output as C<name='UNKNOWN';>.
303 See also C<-V:name> in L<perlrun/Switches>.
309 Here's a more sophisticated example of using %Config:
316 unless($Config{sig_name} && $Config{sig_num}) {
319 my @names = split ' ', $Config{sig_name};
320 @sig_num{@names} = split ' ', $Config{sig_num};
322 $sig_name[$sig_num{$_}] ||= $_;
326 print "signal #17 = $sig_name[17]\n";
327 if ($sig_num{ALRM}) {
328 print "SIGALRM is $sig_num{ALRM}\n";
333 Because this information is not stored within the perl executable
334 itself it is possible (but unlikely) that the information does not
335 relate to the actual perl binary which is being used to access it.
337 The Config module is installed into the architecture and version
338 specific library directory ($Config{installarchlib}) and it checks the
339 perl version number when loaded.
341 The values stored in config.sh may be either single-quoted or
342 double-quoted. Double-quoted strings are handy for those cases where you
343 need to include escape sequences in the strings. To avoid runtime variable
344 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
345 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
346 or C<\@> in double-quoted strings unless you're willing to deal with the
347 consequences. (The slashes will end up escaped and the C<$> or C<@> will
348 trigger variable interpolation)
352 Most C<Config> variables are determined by the C<Configure> script
353 on platforms supported by it (which is most UNIX platforms). Some
354 platforms have custom-made C<Config> variables, and may thus not have
355 some of the variables described below, or may have extraneous variables
356 specific to that particular port. See the port specific documentation
361 open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
367 s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m;
368 my $c = substr $1, 0, 1;
369 unless ($seen{$c}++) {
370 print CONFIG <<EOF if $text;
382 s/n't/n\00t/g; # leave can't, won't etc untouched
383 s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
384 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
385 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
386 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
387 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
389 (?<! [\w./<\'\"] ) # Only standalone file names
390 (?! e \. g \. ) # Not e.g.
391 (?! \. \. \. ) # Not ...
393 ( [\w./]* [./] [\w./]* ) # Require . or / inside
394 (?<! \. (?= \s ) ) # Do not include trailing dot
395 (?! [\w/] ) # Include all of it
397 (F<$1>)xg; # /usr/local
398 s/((?<=\s)~\w*)/F<$1>/g; # ~name
399 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
400 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
401 s/n[\0]t/n't/g; # undo can't, won't damage
404 <GLOS>; # Skip the preamble
410 print CONFIG <<'ENDOFTAIL';
416 This module contains a good example of how to use tie to implement a
417 cache and an example of how to make a tied variable readonly to those
427 # Now do some simple tests on the Config.pm file we have created
432 die "$0: $config_pm not valid"
433 unless $Config{'CONFIGDOTSH'} eq 'true';
435 die "$0: error processing $config_pm"
436 if defined($Config{'an impossible name'})
437 or $Config{'CONFIGDOTSH'} ne 'true' # test cache
440 die "$0: error processing $config_pm"
441 if eval '$Config{"cc"} = 1'
442 or eval 'delete $Config{"cc"}'