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 PERL_CONFIG_SH=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 'PERL_CONFIG_SH') {
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, $quote_type);
134 if ($_[1] eq 'byteorder') {
135 # byteorder does exist on its own but we overlay a virtual
136 # dynamically recomputed value.
137 my $t = $Config{ivtype};
138 my $s = $Config{ivsize};
139 my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';
140 if ($s == 4 || $s == 8) {
142 foreach my $c (reverse(2..$s)) { $i |= ord($c); $i <<= 8 }
144 $value = join('', unpack('a'x$s, pack($f, $i)));
148 } elsif ($_[1] =~ /^((?:cc|ld)flags|libs(?:wanted)?)_nolargefiles/) {
149 # These are purely virtual, they do not exist, but need to
150 # be computed on demand for largefile-incapable extensions.
151 my $key = "${1}_uselargefiles";
152 $value = $Config{$1};
153 my $withlargefiles = $Config{$key};
154 if ($key =~ /^(?:cc|ld)flags_/) {
155 $value =~ s/\Q$withlargefiles\E\b//;
156 } elsif ($key =~ /^libs/) {
157 my @lflibswanted = split(' ', $Config{libswanted_uselargefiles});
160 @lflibswanted{@lflibswanted} = ();
161 if ($key =~ /^libs_/) {
162 my @libs = grep { /^-l(.+)/ &&
163 not exists $lflibswanted{$1} }
164 split(' ', $Config{libs});
165 $Config{libs} = join(' ', @libs);
166 } elsif ($key =~ /^libswanted_/) {
167 my @libswanted = grep { not exists $lflibswanted{$_} }
168 split(' ', $Config{libswanted});
169 $Config{libswanted} = join(' ', @libswanted);
175 # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m);
176 # Check for the common case, ' delimeted
177 $start = index($config_sh, "\n$marker$quote_type");
178 # If that failed, check for " delimited
181 $start = index($config_sh, "\n$marker$quote_type");
183 return undef if ( ($start == -1) && # in case it's first
184 (substr($config_sh, 0, length($marker)) ne $marker) );
186 # It's the very first thing we found. Skip $start forward
187 # and figure out the quote mark after the =.
188 $start = length($marker) + 1;
189 $quote_type = substr($config_sh, $start - 1, 1);
192 $start += length($marker) + 2;
194 $value = substr($config_sh, $start,
195 index($config_sh, "$quote_type\n", $start) - $start);
197 # If we had a double-quote, we'd better eval it so escape
198 # sequences and such can be interpolated. Since the incoming
199 # value is supposed to follow shell rules and not perl rules,
200 # we escape any perl variable markers
201 if ($quote_type eq '"') {
202 $value =~ s/\$/\\\$/g;
203 $value =~ s/\@/\\\@/g;
204 eval "\$value = \"$value\"";
206 #$value = sprintf($value) if $quote_type eq '"';
207 # So we can say "if $Config{'foo'}".
208 $value = undef if $value eq 'undef';
209 $_[0]->{$_[1]} = $value; # cache it
217 # my($key) = $config_sh =~ m/^(.*?)=/;
218 substr($config_sh, 0, index($config_sh, '=') );
223 # Find out how the current key's quoted so we can skip to its end.
224 my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1);
225 my $pos = index($config_sh, qq($quote\n), $prevpos) + 2;
226 my $len = index($config_sh, "=", $pos) - $pos;
228 $len > 0 ? substr($config_sh, $pos, $len) : undef;
232 # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m;
233 exists($_[0]->{$_[1]}) or
234 index($config_sh, "\n$_[1]='") != -1 or
235 substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or
236 index($config_sh, "\n$_[1]=\"") != -1 or
237 substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\"" or
238 $_[1] =~ /^(?:(?:cc|ld)flags|libs(?:wanted)?)_nolargefiles$/;
241 sub STORE { die "\%Config::Config is read-only\n" }
242 sub DELETE { &STORE }
252 my @matches = ($config_sh =~ /^$re=.*\n/mg);
253 @matches ? (print @matches) : print "$re: not found\n";
258 config_re($_), next if /\W/;
259 my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN';
260 $v='undef' unless defined $v;
268 print CONFIG <<'ENDOFSET';
271 my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m;
272 for (split ' ', $value) {
273 ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m;
274 $preconfig{$_} = $v eq 'undef' ? undef : $v;
277 sub TIEHASH { bless {%preconfig} }
280 print CONFIG <<'ENDOFSET';
281 sub TIEHASH { bless {} }
285 print CONFIG <<'ENDOFTAIL';
287 # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
290 tie %Config, 'Config';
297 Config - access Perl configuration information
302 if ($Config{'cc'} =~ /gcc/) {
303 print "built by gcc\n";
306 use Config qw(myconfig config_sh config_vars);
312 config_vars(qw(osname archname));
317 The Config module contains all the information that was available to
318 the C<Configure> program at Perl build time (over 900 values).
320 Shell variables from the F<config.sh> file (written by Configure) are
321 stored in the readonly-variable C<%Config>, indexed by their names.
323 Values stored in config.sh as 'undef' are returned as undefined
324 values. The perl C<exists> function can be used to check if a
325 named variable exists.
331 Returns a textual summary of the major perl configuration values.
332 See also C<-V> in L<perlrun/Switches>.
336 Returns the entire perl configuration information in the form of the
337 original config.sh shell variable assignment script.
339 =item config_vars(@names)
341 Prints to STDOUT the values of the named configuration variable. Each is
342 printed on a separate line in the form:
346 Names which are unknown are output as C<name='UNKNOWN';>.
347 See also C<-V:name> in L<perlrun/Switches>.
353 Here's a more sophisticated example of using %Config:
360 unless($Config{sig_name} && $Config{sig_num}) {
363 my @names = split ' ', $Config{sig_name};
364 @sig_num{@names} = split ' ', $Config{sig_num};
366 $sig_name[$sig_num{$_}] ||= $_;
370 print "signal #17 = $sig_name[17]\n";
371 if ($sig_num{ALRM}) {
372 print "SIGALRM is $sig_num{ALRM}\n";
377 Because this information is not stored within the perl executable
378 itself it is possible (but unlikely) that the information does not
379 relate to the actual perl binary which is being used to access it.
381 The Config module is installed into the architecture and version
382 specific library directory ($Config{installarchlib}) and it checks the
383 perl version number when loaded.
385 The values stored in config.sh may be either single-quoted or
386 double-quoted. Double-quoted strings are handy for those cases where you
387 need to include escape sequences in the strings. To avoid runtime variable
388 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
389 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
390 or C<\@> in double-quoted strings unless you're willing to deal with the
391 consequences. (The slashes will end up escaped and the C<$> or C<@> will
392 trigger variable interpolation)
396 Most C<Config> variables are determined by the C<Configure> script
397 on platforms supported by it (which is most UNIX platforms). Some
398 platforms have custom-made C<Config> variables, and may thus not have
399 some of the variables described below, or may have extraneous variables
400 specific to that particular port. See the port specific documentation
405 open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
411 s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m;
412 my $c = substr $1, 0, 1;
413 unless ($seen{$c}++) {
414 print CONFIG <<EOF if $text;
426 s/n't/n\00t/g; # leave can't, won't etc untouched
427 s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
428 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
429 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
430 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
431 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
433 (?<! [\w./<\'\"] ) # Only standalone file names
434 (?! e \. g \. ) # Not e.g.
435 (?! \. \. \. ) # Not ...
437 ( [\w./]* [./] [\w./]* ) # Require . or / inside
438 (?<! \. (?= \s ) ) # Do not include trailing dot
439 (?! [\w/] ) # Include all of it
441 (F<$1>)xg; # /usr/local
442 s/((?<=\s)~\w*)/F<$1>/g; # ~name
443 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
444 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
445 s/n[\0]t/n't/g; # undo can't, won't damage
448 <GLOS>; # Skip the preamble
454 print CONFIG <<'ENDOFTAIL';
460 This module contains a good example of how to use tie to implement a
461 cache and an example of how to make a tied variable readonly to those
471 # Now do some simple tests on the Config.pm file we have created
476 die "$0: $config_pm not valid"
477 unless $Config{'PERL_CONFIG_SH'} eq 'true';
479 die "$0: error processing $config_pm"
480 if defined($Config{'an impossible name'})
481 or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
484 die "$0: error processing $config_pm"
485 if eval '$Config{"cc"} = 1'
486 or eval 'delete $Config{"cc"}'