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: $!\n";
22 print CONFIG <<"ENDOFBEG";
26 \@EXPORT = qw(%Config);
27 \@EXPORT_OK = qw(myconfig config_sh config_vars);
30 or die "Perl lib version ($myver) doesn't match executable version (\$])";
32 # This file was created by configpm when Perl was built. Any changes
33 # made to this file will be lost the next time perl is built.
39 @extensions{@extensions} = @extensions;
46 next if m:^#!/bin/sh:;
47 # Catch CONFIGDOTSH=true and PERL_VERSION=n line from Configure.
48 s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/;
50 # grandfather PATCHLEVEL and SUBVERSION and CONFIG
52 if ($k eq 'PERL_VERSION') {
53 push @v_others, "PATCHLEVEL='$v'\n";
55 elsif ($k eq 'PERL_SUBVERSION') {
56 push @v_others, "SUBVERSION='$v'\n";
58 elsif ($k eq 'CONFIGDOTSH') {
59 push @v_others, "CONFIG='$v'\n";
62 # We can delimit things in config.sh with either ' or ".
63 unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
64 push(@non_v, "#$_"); # not a name='value' line
68 if ($in_v) { $val .= $_; }
69 else { ($name,$val) = ($1,$3); }
70 $in_v = $val !~ /$quote\n/;
72 if ($extensions{$name}) { s,/,::,g }
73 if (!$fast{$name}){ push(@v_others, "$name=$quote$val"); next; }
74 push(@v_fast,"$name=$quote$val");
77 foreach(@non_v){ print CONFIG $_ }
80 "my \$config_sh = <<'!END!';\n",
81 join("", @v_fast, sort @v_others),
84 # copy config summary format from the myconfig script
86 print CONFIG "my \$summary = <<'!END!';\n";
88 open(MYCONFIG,"<myconfig") || die "open myconfig failed: $!";
89 1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
90 do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
93 print CONFIG "\n!END!\n", <<'EOT';
94 my $summary_expanded = 0;
97 return $summary if $summary_expanded;
98 $summary =~ s{\$(\w+)}
99 { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge;
100 $summary_expanded = 1;
107 print CONFIG <<'ENDOFEND';
110 # check for cached value (which may be undef so we use exists not defined)
111 return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]});
113 # Search for it in the big string
114 my($value, $start, $marker, $quote_type);
117 # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m);
118 # Check for the common case, ' delimeted
119 $start = index($config_sh, "\n$marker$quote_type");
120 # If that failed, check for " delimited
123 $start = index($config_sh, "\n$marker$quote_type");
125 return undef if ( ($start == -1) && # in case it's first
126 (substr($config_sh, 0, length($marker)) ne $marker) );
128 # It's the very first thing we found. Skip $start forward
129 # and figure out the quote mark after the =.
130 $start = length($marker) + 1;
131 $quote_type = substr($config_sh, $start - 1, 1);
134 $start += length($marker) + 2;
136 $value = substr($config_sh, $start,
137 index($config_sh, "$quote_type\n", $start) - $start);
139 # If we had a double-quote, we'd better eval it so escape
140 # sequences and such can be interpolated. Since the incoming
141 # value is supposed to follow shell rules and not perl rules,
142 # we escape any perl variable markers
143 if ($quote_type eq '"') {
144 $value =~ s/\$/\\\$/g;
145 $value =~ s/\@/\\\@/g;
146 eval "\$value = \"$value\"";
148 #$value = sprintf($value) if $quote_type eq '"';
149 $value = undef if $value eq 'undef'; # So we can say "if $Config{'foo'}".
150 $_[0]->{$_[1]} = $value; # cache it
158 # my($key) = $config_sh =~ m/^(.*?)=/;
159 substr($config_sh, 0, index($config_sh, '=') );
164 # Find out how the current key's quoted so we can skip to its end.
165 my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1);
166 my $pos = index($config_sh, qq($quote\n), $prevpos) + 2;
167 my $len = index($config_sh, "=", $pos) - $pos;
169 $len > 0 ? substr($config_sh, $pos, $len) : undef;
173 # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m;
174 exists($_[0]->{$_[1]}) or
175 index($config_sh, "\n$_[1]='") != -1 or
176 substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or
177 index($config_sh, "\n$_[1]=\"") != -1 or
178 substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\"";
181 sub STORE { die "\%Config::Config is read-only\n" }
182 sub DELETE { &STORE }
192 my @matches = ($config_sh =~ /^$re=.*\n/mg);
193 @matches ? (print @matches) : print "$re: not found\n";
198 config_re($_), next if /\W/;
199 my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN';
200 $v='undef' unless defined $v;
208 print CONFIG <<'ENDOFSET';
211 my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m;
212 for (split ' ', $value) {
213 ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m;
214 $preconfig{$_} = $v eq 'undef' ? undef : $v;
217 sub TIEHASH { bless {%preconfig} }
220 print CONFIG <<'ENDOFSET';
221 sub TIEHASH { bless {} }
225 print CONFIG <<'ENDOFTAIL';
227 # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
230 tie %Config, 'Config';
237 Config - access Perl configuration information
242 if ($Config{'cc'} =~ /gcc/) {
243 print "built by gcc\n";
246 use Config qw(myconfig config_sh config_vars);
252 config_vars(qw(osname archname));
257 The Config module contains all the information that was available to
258 the C<Configure> program at Perl build time (over 900 values).
260 Shell variables from the F<config.sh> file (written by Configure) are
261 stored in the readonly-variable C<%Config>, indexed by their names.
263 Values stored in config.sh as 'undef' are returned as undefined
264 values. The perl C<exists> function can be used to check if a
265 named variable exists.
271 Returns a textual summary of the major perl configuration values.
272 See also C<-V> in L<perlrun/Switches>.
276 Returns the entire perl configuration information in the form of the
277 original config.sh shell variable assignment script.
279 =item config_vars(@names)
281 Prints to STDOUT the values of the named configuration variable. Each is
282 printed on a separate line in the form:
286 Names which are unknown are output as C<name='UNKNOWN';>.
287 See also C<-V:name> in L<perlrun/Switches>.
293 Here's a more sophisticated example of using %Config:
300 unless($Config{sig_name} && $Config{sig_num}) {
303 my @names = split ' ', $Config{sig_name};
304 @sig_num{@names} = split ' ', $Config{sig_num};
306 $sig_name[$sig_num{$_}] ||= $_;
310 print "signal #17 = $sig_name[17]\n";
311 if ($sig_num{ALRM}) {
312 print "SIGALRM is $sig_num{ALRM}\n";
317 Because this information is not stored within the perl executable
318 itself it is possible (but unlikely) that the information does not
319 relate to the actual perl binary which is being used to access it.
321 The Config module is installed into the architecture and version
322 specific library directory ($Config{installarchlib}) and it checks the
323 perl version number when loaded.
325 The values stored in config.sh may be either single-quoted or
326 double-quoted. Double-quoted strings are handy for those cases where you
327 need to include escape sequences in the strings. To avoid runtime variable
328 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
329 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
330 or C<\@> in double-quoted strings unless you're willing to deal with the
331 consequences. (The slashes will end up escaped and the C<$> or C<@> will
332 trigger variable interpolation)
336 Most C<Config> variables are determined by the C<Configure> script
337 on platforms supported by it (which is most UNIX platforms). Some
338 platforms have custom-made C<Config> variables, and may thus not have
339 some of the variables described below, or may have extraneous variables
340 specific to that particular port. See the port specific documentation
345 open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
351 s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m;
352 my $c = substr $1, 0, 1;
353 unless ($seen{$c}++) {
354 print CONFIG <<EOF if $text;
366 s/n't/n\00t/g; # leave can't, won't etc untouched
367 s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
368 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
369 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
370 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
371 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
373 (?<! [\w./<\'\"] ) # Only standalone file names
374 (?! e \. g \. ) # Not e.g.
375 (?! \. \. \. ) # Not ...
377 ( [\w./]* [./] [\w./]* ) # Require . or / inside
378 (?<! \. (?= \s ) ) # Do not include trailing dot
379 (?! [\w/] ) # Include all of it
381 (F<$1>)xg; # /usr/local
382 s/((?<=\s)~\w*)/F<$1>/g; # ~name
383 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
384 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
385 s/n[\0]t/n't/g; # undo can't, won't damage
388 <GLOS>; # Skip the preamble
394 print CONFIG <<'ENDOFTAIL';
400 This module contains a good example of how to use tie to implement a
401 cache and an example of how to make a tied variable readonly to those
411 # Now do some simple tests on the Config.pm file we have created
416 die "$0: $config_pm not valid"
417 unless $Config{'CONFIGDOTSH'} eq 'true';
419 die "$0: error processing $config_pm"
420 if defined($Config{'an impossible name'})
421 or $Config{'CONFIGDOTSH'} ne 'true' # test cache
424 die "$0: error processing $config_pm"
425 if eval '$Config{"cc"} = 1'
426 or eval 'delete $Config{"cc"}'