5 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
6 # 2002, 2003, 2004, 2005, 2006, 2007 Larry Wall and others.
16 # from the contents of the static files
21 # and from the contents of the Configure-generated file
26 # It will only update Config.pm and Config_heavy.pl if the contents of
27 # either file would be different. Note that *both* files are updated in
28 # this case, since for example an extension makefile that has a dependency
29 # on Config.pm should trigger even if only Config_heavy.pl has changed.
31 sub usage { die <<EOF }
33 --no-glossary don't include Porting/Glossary in lib/Config.pod
34 --chdir=dir change directory before writing files
38 use vars qw(%Config $Config_SH_expanded);
40 my $how_many_common = 22;
42 # commonly used names to precache (and hence lookup fastest)
45 while ($how_many_common--) {
48 /^(\S+):\s*(\d+)$/ or die "Malformed line '$_'";
52 # Post 37589e1eefb1bd62 DynaLoader defaults to reading these at runtime.
53 # Ideally we're redo the data below, but Fotango's build system made it
54 # wonderfully easy to instrument, and no longer exists.
55 $Common{$_} = $_ foreach qw(dlext so);
57 # names of things which may need to have slashes changed to double-colons
58 my %Extensions = map {($_,$_)}
59 qw(dynamic_ext static_ext extensions known_extensions);
61 # The plan is that this information is used by ExtUtils::MakeMaker to generate
62 # Makefile dependencies, rather than hardcoding a list, which has become out
63 # of date. However, currently, MM_Unix.pm and MM_VMS.pm have *different* lists,
64 # *and* descrip_mms.template doesn't actually install all the headers.
65 # The "Unix" list seems to (attempt to) avoid the generated headers, which I'm
66 # not sure is the right thing to do. Also, not certain whether it would be
67 # easier to parse MANIFEST to get these (adding config.h, and potentially
68 # removing others), but for now, stick to a hard coded list.
70 # Could use a map to add ".h", but I suspect that it's easier to use literals,
71 # so that anyone using grep will find them
72 # This is the list from MM_VMS, plus pad.h, parser.h, utf8.h
73 # which it installs. It *doesn't* install perliol.h - FIXME.
74 my @header_files = qw(EXTERN.h INTERN.h XSUB.h av.h config.h cop.h cv.h
75 embed.h embedvar.h form.h gv.h handy.h hv.h hv_func.h intrpvar.h
76 iperlsys.h keywords.h mg.h nostdio.h op.h opcode.h
77 pad.h parser.h patchlevel.h perl.h perlio.h perlsdio.h
78 perlvars.h perly.h pp.h pp_proto.h proto.h
79 regcomp.h regexp.h regnodes.h scope.h sv.h thread.h utf8.h
83 $^O eq 'VMS' ? 'vmsish.h' : qw(dosish.h perliol.h time64.h unixish.h);
85 my $header_files = ' return qw(' . join(' ', sort @header_files) . ');';
86 $header_files =~ s/(?=.{64}) # If line is still overlength
87 (.{1,64})\ # Split at the last convenient space
90 # allowed opts as well as specifies default and initial values
92 'glossary' => 1, # --no-glossary - no glossary file inclusion,
94 'chdir' => '', # --chdir=dir - change directory before writing files
98 # user specified options
101 (map {/^--([\-_\w]+)=(.*)$/} @ARGV),
102 # --opt --no-opt --noopt
103 (map {/^no-?(.*)$/i?($1=>0):($_=>1)} map {/^--([\-_\w]+)$/} @ARGV),
106 my %opts = (%Allowed_Opts, %given_opts);
108 for my $opt (grep {!exists $Allowed_Opts{$_}} keys %given_opts) {
109 warn "option '$opt' is not recognized";
112 @ARGV = grep {!/^--/} @ARGV;
121 chdir $Opts{chdir} or die "$0: could not chdir $Opts{chdir}: $!"
124 my ($Config_SH, $Config_PM, $Config_heavy, $Config_POD);
125 my $Glossary = 'Porting/Glossary';
127 $Config_PM = "lib/Config.pm";
128 $Config_POD = "lib/Config.pod";
129 $Config_SH = "config.sh";
131 ($Config_heavy = $Config_PM) =~ s/\.pm$/_heavy.pl/;
132 die "Can't automatically determine name for Config_heavy.pl from '$Config_PM'"
133 if $Config_heavy eq $Config_PM;
138 my $export_funcs = <<'EOT';
139 my %Export_Cache = (myconfig => 1, config_sh => 1, config_vars => 1,
140 config_re => 1, compile_date => 1, local_patches => 1,
141 bincompat_options => 1, non_bincompat_options => 1,
145 my %export_ok = eval $export_funcs or die;
147 $config_txt .= sprintf << 'EOT', $], $export_funcs;
148 # This file was created by configpm when Perl was built. Any changes
149 # made to this file will be lost the next time perl is built.
151 # for a description of the variables, please have a look at the
152 # Glossary file, as written in the Porting folder, or use the url:
153 # http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary
158 use vars '%%Config', '$VERSION';
162 # Skip @Config::EXPORT because it only contains %%Config, which we special
163 # case below as it's not a function. @Config::EXPORT won't change in the
164 # lifetime of Perl 5.
166 @Config::EXPORT = qw(%%Config);
167 @Config::EXPORT_OK = keys %%Export_Cache;
169 # Need to stub all the functions to make code such as print Config::config_sh
174 $config_txt .= "sub $_;\n" foreach sort keys %export_ok;
176 my $myver = sprintf "%vd", $^V;
178 $config_txt .= sprintf <<'ENDOFBEG', ($myver) x 3;
180 # Define our own import method to avoid pulling in the full Exporter:
183 @_ = @Config::EXPORT unless @_;
185 my @funcs = grep $_ ne '%%Config', @_;
186 my $export_Config = @funcs < @_ ? 1 : 0;
189 my $callpkg = caller(0);
190 foreach my $func (@funcs) {
191 die qq{"$func" is not exported by the Config module\n}
192 unless $Export_Cache{$func};
193 *{$callpkg.'::'.$func} = \&{$func};
196 *{"$callpkg\::Config"} = \%%Config if $export_Config;
200 die "$0: Perl lib version (%s) doesn't match executable '$^X' version ($])"
204 or die sprintf "%%s: Perl lib version (%s) doesn't match executable '$^X' version (%%vd)", $0, $^V;
219 open(CONFIG_SH, '<', $Config_SH) || die "Can't open $Config_SH: $!";
220 while (<CONFIG_SH>) {
221 next if m:^#!/bin/sh:;
223 # Catch PERL_CONFIG_SH=true and PERL_VERSION=n line from Configure.
224 s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/ or m/^(\w+)='(.*)'$/;
225 my($k, $v) = ($1, $2);
227 # grandfather PATCHLEVEL and SUBVERSION and CONFIG
229 if ($k eq 'PERL_VERSION') {
230 push @v_others, "PATCHLEVEL='$v'\n";
232 elsif ($k eq 'PERL_SUBVERSION') {
233 push @v_others, "SUBVERSION='$v'\n";
235 elsif ($k eq 'PERL_CONFIG_SH') {
236 push @v_others, "CONFIG='$v'\n";
240 # We can delimit things in config.sh with either ' or ".
241 unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
242 push(@non_v, "#$_"); # not a name='value' line
250 ($name,$val) = ($1,$3);
252 $val =~ s{^(['"]?+).*\bccache\s+}{$1};
255 $in_v = $val !~ /$quote\n/;
258 s,/,::,g if $Extensions{$name};
260 $val =~ s/$quote\n?\z//;
262 my $line = "$name=$quote$val$quote\n";
263 push(@v_others, $line);
264 $seen_quotes{$quote}++;
269 # This is somewhat grim, but I want the code for parsing config.sh here and
270 # now so that I can expand $Config{ivsize} and $Config{ivtype}
272 my $fetch_string = <<'EOT';
274 # Search for it in the big string
276 my($self, $key) = @_;
280 if ($seen_quotes{'"'}) {
281 # We need the full ' and " code
283 $fetch_string .= <<'EOT';
284 return undef unless my ($quote_type, $value) = $Config_SH_expanded =~ /\n$key=(['"])(.*?)\1\n/s;
286 # If we had a double-quote, we'd better eval it so escape
287 # sequences and such can be interpolated. Since the incoming
288 # value is supposed to follow shell rules and not perl rules,
289 # we escape any perl variable markers
291 # Historically, since " 'support' was added in change 1409, the
292 # interpolation was done before the undef. Stick to this arguably buggy
293 # behaviour as we're refactoring.
294 if ($quote_type eq '"') {
295 $value =~ s/\$/\\\$/g;
296 $value =~ s/\@/\\\@/g;
297 eval "\$value = \"$value\"";
300 # So we can say "if $Config{'foo'}".
301 $self->{$key} = $value eq 'undef' ? undef : $value; # cache it
306 # We only have ' delimited.
308 $fetch_string .= <<'EOT';
309 return undef unless $Config_SH_expanded =~ /\n$key=\'(.*?)\'\n/s;
310 # So we can say "if $Config{'foo'}".
311 $self->{$key} = $1 eq 'undef' ? undef : $1;
320 # Calculation for the keys for byteorder
321 # This is somewhat grim, but I need to run fetch_string here.
322 our $Config_SH_expanded = join "\n", '', @v_others;
324 my $t = fetch_string ({}, 'ivtype');
325 my $s = fetch_string ({}, 'ivsize');
327 # byteorder does exist on its own but we overlay a virtual
328 # dynamically recomputed value.
330 # However, ivtype and ivsize will not vary for sane fat binaries
332 my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';
335 if ($s == 4 || $s == 8) {
336 my $list = join ',', reverse(1..$s-1);
338 $byteorder_code = <<"EOT";
341 foreach my \$c ($list) { \$i <<= 8; \$i |= ord(\$c); }
342 our \$byteorder = join('', unpack('$format', pack('$f', \$i)));
345 $byteorder_code = "our \$byteorder = '?'x$s;\n";
350 if (fetch_string({},'userelocatableinc')) {
351 foreach my $what (qw(prefixexp
400 installvendorhtml1dir
401 installvendorhtml3dir
407 push @need_relocation, $what if fetch_string({}, $what) =~ m!^\.\.\./!;
412 @need_relocation{@need_relocation} = @need_relocation;
414 # This can have .../ anywhere:
415 if (fetch_string({}, 'otherlibdirs') =~ m!\.\.\./!) {
416 $need_relocation{otherlibdirs} = 'otherlibdirs';
419 my $relocation_code = <<'EOT';
423 return $libdir unless $libdir =~ s!^\.\.\./!!;
425 if ($prefix =~ s!/[^/]*$!!) {
426 while ($libdir =~ m!^\.\./!) {
427 # Loop while $libdir starts "../" and $prefix still has a trailing
429 last unless $prefix =~ s!/([^/]+)$!!;
430 # but bail out if the directory we picked off the end of $prefix is .
432 if ($1 eq '.' or $1 eq '..') {
433 # Undo! This should be rare, hence code it this way rather than a
434 # check each time before the s!!! above.
435 $prefix = "$prefix/$1";
438 # Remove that leading ../ and loop again
439 substr ($libdir, 0, 3, '');
441 $libdir = "$prefix/$libdir";
447 my $osname = fetch_string({}, 'osname');
448 my $from = $osname eq 'VMS' ? 'PERLSHR image' : 'binary (from libperl)';
449 my $env_cygwin = $osname eq 'cygwin'
450 ? 'push @env, "CYGWIN=\"$ENV{CYGWIN}\"" if $ENV{CYGWIN};' . "\n" : "";
452 $heavy_txt .= sprintf <<'ENDOFBEG', $osname, $osname, $from, $osname, $env_cygwin;
453 # This file was created by configpm when Perl was built. Any changes
454 # made to this file will be lost the next time perl is built.
461 sub bincompat_options {
462 return split ' ', (Internals::V())[0];
465 sub non_bincompat_options {
466 return split ' ', (Internals::V())[1];
470 return (Internals::V())[2]
474 my (undef, undef, undef, @patches) = Internals::V();
479 die "Perl lib was built for '%s' but is being run on '$^O'"
482 my ($bincompat, $non_bincompat, $date, @patches) = Internals::V();
484 my @opts = sort split ' ', "$bincompat $non_bincompat";
486 print Config::myconfig();
487 print "\nCharacteristics of this %s: \n";
489 print " Compile-time options:\n";
490 print " $_\n" for @opts;
493 print " Locally applied patches:\n";
494 print " $_\n" foreach @patches;
497 print " Built under %s\n";
499 print " $date\n" if defined $date;
501 my @env = map { "$_=\"$ENV{$_}\"" } sort grep {/^PERL/} keys %%ENV;
505 print " $_\n" foreach @env;
508 print " $_\n" foreach @INC;
514 $heavy_txt .= $header_files . "\n}\n\n";
516 if (%need_relocation) {
517 my $relocations_in_common;
518 # otherlibdirs only features in the hash
519 foreach (keys %need_relocation) {
520 $relocations_in_common++ if $Common{$_};
522 if ($relocations_in_common) {
523 $config_txt .= $relocation_code;
525 $heavy_txt .= $relocation_code;
529 $heavy_txt .= join('', @non_v) . "\n";
531 # copy config summary format from the myconfig.SH script
532 $heavy_txt .= "our \$summary = <<'!END!';\n";
533 open(MYCONFIG,'<','myconfig.SH') || die "open myconfig.SH failed: $!";
534 1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
535 do { $heavy_txt .= $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
538 $heavy_txt .= "\n!END!\n" . <<'EOT';
539 my $summary_expanded;
542 return $summary_expanded if $summary_expanded;
543 ($summary_expanded = $summary) =~ s{\$(\w+)}
546 if ($1 eq 'git_ancestor_line') {
547 if ($Config::Config{git_ancestor}) {
548 $c= "\n Ancestor: $Config::Config{git_ancestor}";
553 $c = $Config::Config{$1};
555 defined($c) ? $c : 'undef'
563 #proper lexicographical order of the keys
564 $heavy_txt .= join('',
566 sort {$a->[0] cmp $b->[0] }
568 /^([^=]+)/ ? [ $1, $_ ]
569 : [ $_, $_ ] # shouldnt happen
573 # Only need the dynamic byteorder code in Config.pm if 'byteorder' is one of
575 if ($Common{byteorder}) {
576 $config_txt .= $byteorder_code;
578 $heavy_txt .= $byteorder_code;
581 if (@need_relocation) {
582 $heavy_txt .= 'foreach my $what (qw(' . join (' ', @need_relocation) .
584 s/^($what=)(['"])(.*?)\2/$1 . $2 . relocate_inc($3) . $2/me;
587 # Currently it only makes sense to do the ... relocation on Unix, so there's
588 # no need to emulate the "which separator for this platform" logic in perl.c -
589 # ':' will always be applicable
590 if ($need_relocation{otherlibdirs}) {
591 $heavy_txt .= << 'EOT';
592 s{^(otherlibdirs=)(['"])(.*?)\2}
593 {$1 . $2 . join ':', map {relocate_inc($_)} split ':', $3 . $2}me;
598 $heavy_txt .= <<'EOT';
599 s/(byteorder=)(['"]).*?\2/$1$2$Config::byteorder$2/m;
601 my $config_sh_len = length $_;
603 our $Config_SH_expanded = "\n$_" . << 'EOVIRTUAL';
606 foreach my $prefix (qw(ccflags ldflags)) {
607 my $value = fetch_string ({}, $prefix);
608 my $withlargefiles = fetch_string ({}, $prefix . "_uselargefiles");
609 if (defined $withlargefiles) {
610 $value =~ s/\Q$withlargefiles\E\b//;
611 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
615 foreach my $prefix (qw(libs libswanted)) {
616 my $value = fetch_string ({}, $prefix);
617 my $withlf = fetch_string ({}, 'libswanted_uselargefiles');
618 next unless defined $withlf;
620 = split(' ', fetch_string ({}, 'libswanted_uselargefiles'));
623 @lflibswanted{@lflibswanted} = ();
624 if ($prefix eq 'libs') {
625 my @libs = grep { /^-l(.+)/ &&
626 not exists $lflibswanted{$1} }
627 split(' ', fetch_string ({}, 'libs'));
628 $value = join(' ', @libs);
630 my @libswanted = grep { not exists $lflibswanted{$_} }
631 split(' ', fetch_string ({}, 'libswanted'));
632 $value = join(' ', @libswanted);
635 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
638 if (open(my $fh, '<', 'cflags')) {
642 if (/^warn="(.+)"$/) {
644 } elsif (/^stdflags="(.+)"$/) {
648 if (defined $ccwarnflags) {
649 $heavy_txt .= "ccwarnflags='$ccwarnflags'\n";
651 if (defined $ccstdflags) {
652 $heavy_txt .= "ccstdflags='$ccstdflags'\n";
656 $heavy_txt .= "EOVIRTUAL\n";
658 $heavy_txt .= <<'ENDOFGIT';
660 # do not have hairy conniptions if this isnt available
661 require 'Config_git.pl';
662 $Config_SH_expanded .= $Config::Git_Data;
664 } or warn "Warning: failed to load Config_git.pl, something strange about this perl...\n";
667 $heavy_txt .= $fetch_string;
669 $config_txt .= <<'ENDOFEND';
672 my($self, $key) = @_;
674 # check for cached value (which may be undef so we use exists not defined)
675 return exists $self->{$key} ? $self->{$key} : $self->fetch_string($key);
680 $heavy_txt .= <<'ENDOFEND';
686 substr($Config_SH_expanded, 1, index($Config_SH_expanded, '=') - 1 );
691 if ($seen_quotes{'"'}) {
692 $heavy_txt .= <<'ENDOFEND';
693 # Find out how the current key's quoted so we can skip to its end.
694 my $quote = substr($Config_SH_expanded,
695 index($Config_SH_expanded, "=", $prevpos)+1, 1);
696 my $pos = index($Config_SH_expanded, qq($quote\n), $prevpos) + 2;
699 # Just ' quotes, so it's much easier.
700 $heavy_txt .= <<'ENDOFEND';
701 my $pos = index($Config_SH_expanded, qq('\n), $prevpos) + 2;
704 $heavy_txt .= <<'ENDOFEND';
705 my $len = index($Config_SH_expanded, "=", $pos) - $pos;
707 $len > 0 ? substr($Config_SH_expanded, $pos, $len) : undef;
711 return 1 if exists($_[0]->{$_[1]});
713 return(index($Config_SH_expanded, "\n$_[1]='") != -1
715 if ($seen_quotes{'"'}) {
716 $heavy_txt .= <<'ENDOFEND';
717 or index($Config_SH_expanded, "\n$_[1]=\"") != -1
720 $heavy_txt .= <<'ENDOFEND';
724 sub STORE { die "\%Config::Config is read-only\n" }
725 *DELETE = *CLEAR = \*STORE; # Typeglob aliasing uses less space
728 substr $Config_SH_expanded, 1, $config_sh_len;
733 return map { chomp; $_ } grep eval{ /^(?:$re)=/ }, split /^/,
738 # implements -V:cfgvar option (see perlrun -V:)
740 # find optional leading, trailing colons; and query-spec
741 my ($notag,$qry,$lncont) = m/^(:)?(.*?)(:)?$/; # flags fore and aft,
742 # map colon-flags to print decorations
743 my $prfx = $notag ? '': "$qry="; # tag-prefix for print
744 my $lnend = $lncont ? ' ' : ";\n"; # line ending for print
746 # all config-vars are by definition \w only, any \W means regex
748 my @matches = config_re($qry);
749 print map "$_$lnend", @matches ? @matches : "$qry: not found" if !$notag;
750 print map { s/\w+=//; "$_$lnend" } @matches ? @matches : "$qry: not found" if $notag;
752 my $v = (exists $Config::Config{$qry}) ? $Config::Config{$qry}
754 $v = 'undef' unless defined $v;
755 print "${prfx}'${v}'$lnend";
760 # Called by the real AUTOLOAD
763 goto \&$Config::AUTOLOAD;
770 $config_txt .= <<'ENDOFSET';
773 my ($value, $v) = $Config_SH_expanded =~ m/^used_aout='(.*)'\s*$/m;
774 for (split ' ', $value) {
775 ($v) = $Config_SH_expanded =~ m/^aout_$_='(.*)'\s*$/m;
776 $preconfig{$_} = $v eq 'undef' ? undef : $v;
779 $preconfig{d_fork} = undef unless $OS2::can_fork; # Some funny cases can't
780 sub TIEHASH { bless {%preconfig} }
782 # Extract the name of the DLL from the makefile to avoid duplication
783 my ($f) = grep -r, qw(GNUMakefile Makefile);
785 if (open my $fh, '<', $f) {
787 $dll = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
790 $config_txt .= <<ENDOFSET if $dll;
791 \$preconfig{dll_name} = '$dll';
794 $config_txt .= <<'ENDOFSET';
801 foreach my $key (keys %Common) {
802 my $value = fetch_string ({}, $key);
803 # Is it safe on the LHS of => ?
804 my $qkey = $key =~ /^[A-Za-z_][A-Za-z0-9_]*$/ ? $key : "'$key'";
805 if (defined $value) {
806 # Quote things for a '' string
807 $value =~ s!\\!\\\\!g;
810 if ($key eq 'otherlibdirs') {
811 $value = "join (':', map {relocate_inc(\$_)} split (':', $value))";
812 } elsif ($need_relocation{$key}) {
813 $value = "relocate_inc($value)";
818 $Common{$key} = "$qkey => $value";
821 if ($Common{byteorder}) {
822 $Common{byteorder} = 'byteorder => $byteorder';
824 my $fast_config = join '', map { " $_,\n" } sort values %Common;
826 # Sanity check needed to stop an infinite loop if Config_heavy.pl fails to
827 # define &launcher for some reason (eg it got truncated)
828 $config_txt .= sprintf <<'ENDOFTIE', $fast_config;
833 require 'Config_heavy.pl';
834 goto \&launcher unless $Config::AUTOLOAD =~ /launcher$/;
835 die "&Config::AUTOLOAD failed on $Config::AUTOLOAD";
838 # tie returns the object, so the value returned to require will be true.
839 tie %%Config, 'Config', {
844 open(CONFIG_POD, '>', $Config_POD) or die "Can't open $Config_POD: $!";
845 print CONFIG_POD <<'ENDOFTAIL';
848 Config - access Perl configuration information
853 if ($Config{usethreads}) {
854 print "has thread support\n"
857 use Config qw(myconfig config_sh config_vars config_re);
865 config_vars(qw(osname archname));
870 The Config module contains all the information that was available to
871 the C<Configure> program at Perl build time (over 900 values).
873 Shell variables from the F<config.sh> file (written by Configure) are
874 stored in the readonly-variable C<%Config>, indexed by their names.
876 Values stored in config.sh as 'undef' are returned as undefined
877 values. The perl C<exists> function can be used to check if a
878 named variable exists.
880 For a description of the variables, please have a look at the
881 Glossary file, as written in the Porting folder, or use the url:
882 http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary
888 Returns a textual summary of the major perl configuration values.
889 See also C<-V> in L<perlrun/Command Switches>.
893 Returns the entire perl configuration information in the form of the
894 original config.sh shell variable assignment script.
896 =item config_re($regex)
898 Like config_sh() but returns, as a list, only the config entries who's
899 names match the $regex.
901 =item config_vars(@names)
903 Prints to STDOUT the values of the named configuration variable. Each is
904 printed on a separate line in the form:
908 Names which are unknown are output as C<name='UNKNOWN';>.
909 See also C<-V:name> in L<perlrun/Command Switches>.
911 =item bincompat_options()
913 Returns a list of C pre-processor options used when compiling this F<perl>
914 binary, which affect its binary compatibility with extensions.
915 C<bincompat_options()> and C<non_bincompat_options()> are shown together in
916 the output of C<perl -V> as I<Compile-time options>.
918 =item non_bincompat_options()
920 Returns a list of C pre-processor options used when compiling this F<perl>
921 binary, which do not affect binary compatibility with extensions.
925 Returns the compile date (as a string), equivalent to what is shown by
928 =item local_patches()
930 Returns a list of the names of locally applied patches, equivalent to what
931 is shown by C<perl -V>.
935 Returns a list of the header files that should be used as dependencies for
936 XS code, for this version of Perl on this platform.
942 Here's a more sophisticated example of using %Config:
949 unless($Config{sig_name} && $Config{sig_num}) {
952 my @names = split ' ', $Config{sig_name};
953 @sig_num{@names} = split ' ', $Config{sig_num};
955 $sig_name[$sig_num{$_}] ||= $_;
959 print "signal #17 = $sig_name[17]\n";
960 if ($sig_num{ALRM}) {
961 print "SIGALRM is $sig_num{ALRM}\n";
966 Because this information is not stored within the perl executable
967 itself it is possible (but unlikely) that the information does not
968 relate to the actual perl binary which is being used to access it.
970 The Config module is installed into the architecture and version
971 specific library directory ($Config{installarchlib}) and it checks the
972 perl version number when loaded.
974 The values stored in config.sh may be either single-quoted or
975 double-quoted. Double-quoted strings are handy for those cases where you
976 need to include escape sequences in the strings. To avoid runtime variable
977 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
978 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
979 or C<\@> in double-quoted strings unless you're willing to deal with the
980 consequences. (The slashes will end up escaped and the C<$> or C<@> will
981 trigger variable interpolation)
985 Most C<Config> variables are determined by the C<Configure> script
986 on platforms supported by it (which is most UNIX platforms). Some
987 platforms have custom-made C<Config> variables, and may thus not have
988 some of the variables described below, or may have extraneous variables
989 specific to that particular port. See the port specific documentation
996 if ($Opts{glossary}) {
997 open(GLOS, '<', $Glossary) or die "Can't open $Glossary: $!";
1005 if (s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m) {
1006 my $c = substr $1, 0, 1;
1007 unless ($seen{$c}++) {
1008 print CONFIG_POD <<EOF if $text;
1014 print CONFIG_POD <<EOF;
1025 elsif (!$text || !/\A\t/) {
1026 warn "Expected a Configure variable header",
1027 ($text ? " or another paragraph of description" : () ),
1028 ", instead we got:\n$_";
1031 s/n't/n\00t/g; # leave can't, won't etc untouched
1032 s/^\t\s+(.*)/\n$1/gm; # Indented lines ===> new paragraph
1033 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
1034 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
1035 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
1036 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
1038 (?<! [\w./<\'\"\$] ) # Only standalone file names
1039 (?! e \. g \. ) # Not e.g.
1040 (?! \. \. \. ) # Not ...
1041 (?! \d ) # Not 5.004
1042 (?! read/ ) # Not read/write
1043 (?! etc\. ) # Not etc.
1046 \$ ? # Allow leading $
1047 [\w./]* [./] [\w./]* # Require . or / inside
1049 (?<! \. (?= [\s)] ) ) # Do not include trailing dot
1050 (?! [\w/] ) # Include all of it
1052 (F<$1>)xg; # /usr/local
1053 s/((?<=\s)~\w*)/F<$1>/g; # ~name
1054 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
1055 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
1056 s/n[\0]t/n't/g; # undo can't, won't damage
1059 if ($Opts{glossary}) {
1060 <GLOS>; # Skip the "DO NOT EDIT"
1061 <GLOS>; # Skip the preamble
1067 die "Errors encountered while processing $Glossary. ",
1068 "Header lines are expected to be of the form:\n",
1070 "Maybe there is a malformed header?\n",
1075 print CONFIG_POD <<'ENDOFTAIL';
1081 Information on the git commit from which the current perl binary was compiled
1082 can be found in the variable C<$Config::Git_Data>. The variable is a
1083 structured string that looks something like this:
1085 git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
1086 git_describe='GitLive-blead-1076-gea0c2db'
1087 git_branch='smartmatch'
1088 git_uncommitted_changes=''
1089 git_commit_id_title='Commit id:'
1090 git_commit_date='2009-05-09 17:47:31 +0200'
1092 Its format is not guaranteed not to change over time.
1096 This module contains a good example of how to use tie to implement a
1097 cache and an example of how to make a tied variable readonly to those
1104 close(GLOS) if $Opts{glossary};
1106 print "written $Config_POD\n";
1108 my $orig_config_txt = "";
1109 my $orig_heavy_txt = "";
1113 $orig_config_txt = <$fh> if open $fh, "<", $Config_PM;
1114 $orig_heavy_txt = <$fh> if open $fh, "<", $Config_heavy;
1117 if ($orig_config_txt ne $config_txt or $orig_heavy_txt ne $heavy_txt) {
1118 open CONFIG, ">", $Config_PM or die "Can't open $Config_PM: $!\n";
1119 open CONFIG_HEAVY, ">", $Config_heavy or die "Can't open $Config_heavy: $!\n";
1120 print CONFIG $config_txt;
1121 print CONFIG_HEAVY $heavy_txt;
1122 close(CONFIG_HEAVY);
1124 print "updated $Config_PM\n";
1125 print "updated $Config_heavy\n";
1128 # Now do some simple tests on the Config.pm file we have created
1129 unshift(@INC,'lib');
1131 require $Config_heavy;
1134 die "$0: $Config_PM not valid"
1135 unless $Config{'PERL_CONFIG_SH'} eq 'true';
1137 die "$0: error processing $Config_PM"
1138 if defined($Config{'an impossible name'})
1139 or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
1142 die "$0: error processing $Config_PM"
1143 if eval '$Config{"cc"} = 1'
1144 or eval 'delete $Config{"cc"}'
1149 # Popularity of various entries in %Config, based on a large build and test
1150 # run of code in the Fotango build system:
1168 inc_version_list: 783
1171 usevendorprefix: 642
1192 installsiteman1dir: 489
1193 installsiteman3dir: 489
1194 installvendorman1dir: 489
1195 installvendorman3dir: 489
1199 installsitearch: 344
1204 installprefixexp: 336
1207 installvendorarch: 336
1208 installvendorbin: 336
1209 installvendorlib: 336