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 = grep /^$re=/, split /^/, $config_sh;
253 @matches ? (print @matches) : print "$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 $preconfig{d_fork} = undef unless $OS2::can_fork; # Some funny cases can't
278 sub TIEHASH { bless {%preconfig} }
280 # Extract the name of the DLL from the makefile to avoid duplication
281 my ($f) = grep -r, qw(GNUMakefile Makefile);
283 if (open my $fh, '<', $f) {
285 $dll = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
288 print CONFIG <<ENDOFSET if $dll;
289 \$preconfig{dll_name} = '$dll';
292 print CONFIG <<'ENDOFSET';
293 sub TIEHASH { bless {} }
297 print CONFIG <<'ENDOFTAIL';
299 # avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
302 tie %Config, 'Config';
309 Config - access Perl configuration information
314 if ($Config{'cc'} =~ /gcc/) {
315 print "built by gcc\n";
318 use Config qw(myconfig config_sh config_vars);
324 config_vars(qw(osname archname));
329 The Config module contains all the information that was available to
330 the C<Configure> program at Perl build time (over 900 values).
332 Shell variables from the F<config.sh> file (written by Configure) are
333 stored in the readonly-variable C<%Config>, indexed by their names.
335 Values stored in config.sh as 'undef' are returned as undefined
336 values. The perl C<exists> function can be used to check if a
337 named variable exists.
343 Returns a textual summary of the major perl configuration values.
344 See also C<-V> in L<perlrun/Switches>.
348 Returns the entire perl configuration information in the form of the
349 original config.sh shell variable assignment script.
351 =item config_vars(@names)
353 Prints to STDOUT the values of the named configuration variable. Each is
354 printed on a separate line in the form:
358 Names which are unknown are output as C<name='UNKNOWN';>.
359 See also C<-V:name> in L<perlrun/Switches>.
365 Here's a more sophisticated example of using %Config:
372 unless($Config{sig_name} && $Config{sig_num}) {
375 my @names = split ' ', $Config{sig_name};
376 @sig_num{@names} = split ' ', $Config{sig_num};
378 $sig_name[$sig_num{$_}] ||= $_;
382 print "signal #17 = $sig_name[17]\n";
383 if ($sig_num{ALRM}) {
384 print "SIGALRM is $sig_num{ALRM}\n";
389 Because this information is not stored within the perl executable
390 itself it is possible (but unlikely) that the information does not
391 relate to the actual perl binary which is being used to access it.
393 The Config module is installed into the architecture and version
394 specific library directory ($Config{installarchlib}) and it checks the
395 perl version number when loaded.
397 The values stored in config.sh may be either single-quoted or
398 double-quoted. Double-quoted strings are handy for those cases where you
399 need to include escape sequences in the strings. To avoid runtime variable
400 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
401 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
402 or C<\@> in double-quoted strings unless you're willing to deal with the
403 consequences. (The slashes will end up escaped and the C<$> or C<@> will
404 trigger variable interpolation)
408 Most C<Config> variables are determined by the C<Configure> script
409 on platforms supported by it (which is most UNIX platforms). Some
410 platforms have custom-made C<Config> variables, and may thus not have
411 some of the variables described below, or may have extraneous variables
412 specific to that particular port. See the port specific documentation
417 open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
423 if (s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m) {
424 my $c = substr $1, 0, 1;
425 unless ($seen{$c}++) {
426 print CONFIG <<EOF if $text;
439 elsif (!$text || !/\A\t/) {
440 warn "Expected a Configure variable header",
441 ($text ? " or another paragraph of description" : () );
443 s/n't/n\00t/g; # leave can't, won't etc untouched
444 s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
445 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
446 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
447 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
448 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
450 (?<! [\w./<\'\"] ) # Only standalone file names
451 (?! e \. g \. ) # Not e.g.
452 (?! \. \. \. ) # Not ...
454 (?! read/ ) # Not read/write
455 (?! etc\. ) # Not etc.
458 \$ ? # Allow leading $
459 [\w./]* [./] [\w./]* # Require . or / inside
461 (?<! \. (?= [\s)] ) ) # Do not include trailing dot
462 (?! [\w/] ) # Include all of it
464 (F<$1>)xg; # /usr/local
465 s/((?<=\s)~\w*)/F<$1>/g; # ~name
466 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
467 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
468 s/n[\0]t/n't/g; # undo can't, won't damage
471 <GLOS>; # Skip the preamble
477 print CONFIG <<'ENDOFTAIL';
483 This module contains a good example of how to use tie to implement a
484 cache and an example of how to make a tied variable readonly to those
494 # Now do some simple tests on the Config.pm file we have created
499 die "$0: $config_pm not valid"
500 unless $Config{'PERL_CONFIG_SH'} eq 'true';
502 die "$0: error processing $config_pm"
503 if defined($Config{'an impossible name'})
504 or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
507 die "$0: error processing $config_pm"
508 if eval '$Config{"cc"} = 1'
509 or eval 'delete $Config{"cc"}'