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 our (%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 our ( %%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, $^V;
215 # These variables were set in older versions of Perl, but are no longer needed
216 # by the core. However, some CPAN modules may rely on them; in particular, Tk
217 # (at least up to version 804.034) fails to build without them. We force them
218 # to be emitted to Config_heavy.pl for backcompat with such modules (and we may
219 # find that this set needs to be extended in future). See RT#132347.
220 my @v_forced = map "$_\n", split /\n+/, <<'EOT';
232 open(CONFIG_SH, '<', $Config_SH) || die "Can't open $Config_SH: $!";
233 while (<CONFIG_SH>) {
234 next if m:^#!/bin/sh:;
236 # Catch PERL_CONFIG_SH=true and PERL_VERSION=n line from Configure.
237 s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/ or m/^(\w+)='(.*)'$/;
238 my($k, $v) = ($1, $2);
240 # grandfather PATCHLEVEL and SUBVERSION and CONFIG
242 if ($k eq 'PERL_VERSION') {
243 push @v_others, "PATCHLEVEL='$v'\n";
245 elsif ($k eq 'PERL_SUBVERSION') {
246 push @v_others, "SUBVERSION='$v'\n";
248 elsif ($k eq 'PERL_CONFIG_SH') {
249 push @v_others, "CONFIG='$v'\n";
253 # We can delimit things in config.sh with either ' or ".
254 unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
255 push(@non_v, "#$_"); # not a name='value' line
263 ($name,$val) = ($1,$3);
265 $val =~ s{^(['"]?+).*\bccache\s+}{$1};
268 $in_v = $val !~ /$quote\n/;
271 s,/,::,g if $Extensions{$name};
273 $val =~ s/$quote\n?\z//;
275 my $line = "$name=$quote$val$quote\n";
276 push(@v_others, $line);
277 $seen_quotes{$quote}++;
282 # This is somewhat grim, but I want the code for parsing config.sh here and
283 # now so that I can expand $Config{ivsize} and $Config{ivtype}
285 my $fetch_string = <<'EOT';
287 # Search for it in the big string
289 my($self, $key) = @_;
293 if ($seen_quotes{'"'}) {
294 # We need the full ' and " code
296 $fetch_string .= <<'EOT';
297 return undef unless my ($quote_type, $value) = $Config_SH_expanded =~ /\n$key=(['"])(.*?)\1\n/s;
299 # If we had a double-quote, we'd better eval it so escape
300 # sequences and such can be interpolated. Since the incoming
301 # value is supposed to follow shell rules and not perl rules,
302 # we escape any perl variable markers
304 # Historically, since " 'support' was added in change 1409, the
305 # interpolation was done before the undef. Stick to this arguably buggy
306 # behaviour as we're refactoring.
307 if ($quote_type eq '"') {
308 $value =~ s/\$/\\\$/g;
309 $value =~ s/\@/\\\@/g;
310 eval "\$value = \"$value\"";
313 # So we can say "if $Config{'foo'}".
314 $self->{$key} = $value eq 'undef' ? undef : $value; # cache it
319 # We only have ' delimited.
321 $fetch_string .= <<'EOT';
322 return undef unless $Config_SH_expanded =~ /\n$key=\'(.*?)\'\n/s;
323 # So we can say "if $Config{'foo'}".
324 $self->{$key} = $1 eq 'undef' ? undef : $1;
333 # Calculation for the keys for byteorder
334 # This is somewhat grim, but I need to run fetch_string here.
335 $Config_SH_expanded = join "\n", '', @v_others;
337 my $t = fetch_string ({}, 'ivtype');
338 my $s = fetch_string ({}, 'ivsize');
340 # byteorder does exist on its own but we overlay a virtual
341 # dynamically recomputed value.
343 # However, ivtype and ivsize will not vary for sane fat binaries
345 my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';
348 if ($s == 4 || $s == 8) {
349 my $list = join ',', reverse(1..$s-1);
351 $byteorder_code = <<"EOT";
354 foreach my \$c ($list) { \$i <<= 8; \$i |= ord(\$c); }
355 our \$byteorder = join('', unpack('$format', pack('$f', \$i)));
358 $byteorder_code = "our \$byteorder = '?'x$s;\n";
363 if (fetch_string({},'userelocatableinc')) {
364 foreach my $what (qw(prefixexp
413 installvendorhtml1dir
414 installvendorhtml3dir
420 push @need_relocation, $what if fetch_string({}, $what) =~ m!^\.\.\./!;
425 @need_relocation{@need_relocation} = @need_relocation;
427 # This can have .../ anywhere:
428 if (fetch_string({}, 'otherlibdirs') =~ m!\.\.\./!) {
429 $need_relocation{otherlibdirs} = 'otherlibdirs';
432 my $relocation_code = <<'EOT';
436 return $libdir unless $libdir =~ s!^\.\.\./!!;
438 if ($prefix =~ s!/[^/]*$!!) {
439 while ($libdir =~ m!^\.\./!) {
440 # Loop while $libdir starts "../" and $prefix still has a trailing
442 last unless $prefix =~ s!/([^/]+)$!!;
443 # but bail out if the directory we picked off the end of $prefix is .
445 if ($1 eq '.' or $1 eq '..') {
446 # Undo! This should be rare, hence code it this way rather than a
447 # check each time before the s!!! above.
448 $prefix = "$prefix/$1";
451 # Remove that leading ../ and loop again
452 substr ($libdir, 0, 3, '');
454 $libdir = "$prefix/$libdir";
460 my $osname = fetch_string({}, 'osname');
461 my $from = $osname eq 'VMS' ? 'PERLSHR image' : 'binary (from libperl)';
462 my $env_cygwin = $osname eq 'cygwin'
463 ? 'push @env, "CYGWIN=\"$ENV{CYGWIN}\"" if $ENV{CYGWIN};' . "\n" : "";
465 $heavy_txt .= sprintf <<'ENDOFBEG', $osname, $osname, $from, $osname, $env_cygwin;
466 # This file was created by configpm when Perl was built. Any changes
467 # made to this file will be lost the next time perl is built.
474 sub bincompat_options {
475 return split ' ', (Internals::V())[0];
478 sub non_bincompat_options {
479 return split ' ', (Internals::V())[1];
483 return (Internals::V())[2]
487 my (undef, undef, undef, @patches) = Internals::V();
492 die "Perl lib was built for '%s' but is being run on '$^O'"
495 my ($bincompat, $non_bincompat, $date, @patches) = Internals::V();
497 my @opts = sort split ' ', "$bincompat $non_bincompat";
499 print Config::myconfig();
500 print "\nCharacteristics of this %s: \n";
502 print " Compile-time options:\n";
503 print " $_\n" for @opts;
506 print " Locally applied patches:\n";
507 print " $_\n" foreach @patches;
510 print " Built under %s\n";
512 print " $date\n" if defined $date;
514 my @env = map { "$_=\"$ENV{$_}\"" } sort grep {/^PERL/} keys %%ENV;
518 print " $_\n" foreach @env;
521 print " $_\n" foreach @INC;
527 $heavy_txt .= $header_files . "\n}\n\n";
529 if (%need_relocation) {
530 my $relocations_in_common;
531 # otherlibdirs only features in the hash
532 foreach (keys %need_relocation) {
533 $relocations_in_common++ if $Common{$_};
535 if ($relocations_in_common) {
536 $config_txt .= $relocation_code;
538 $heavy_txt .= $relocation_code;
542 $heavy_txt .= join('', @non_v) . "\n";
544 # copy config summary format from the myconfig.SH script
545 $heavy_txt .= "our \$summary = <<'!END!';\n";
546 open(MYCONFIG,'<','myconfig.SH') || die "open myconfig.SH failed: $!";
547 1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
548 do { $heavy_txt .= $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
551 $heavy_txt .= "\n!END!\n" . <<'EOT';
552 my $summary_expanded;
555 return $summary_expanded if $summary_expanded;
556 ($summary_expanded = $summary) =~ s{\$(\w+)}
559 if ($1 eq 'git_ancestor_line') {
560 if ($Config::Config{git_ancestor}) {
561 $c= "\n Ancestor: $Config::Config{git_ancestor}";
566 $c = $Config::Config{$1};
568 defined($c) ? $c : 'undef'
576 #proper lexicographical order of the keys
577 $heavy_txt .= join('',
579 sort {$a->[0] cmp $b->[0] }
581 /^([^=]+)/ ? [ $1, $_ ]
582 : [ $_, $_ ] # shouldnt happen
583 } @v_others, @v_forced
586 # Only need the dynamic byteorder code in Config.pm if 'byteorder' is one of
588 if ($Common{byteorder}) {
589 $config_txt .= $byteorder_code;
591 $heavy_txt .= $byteorder_code;
594 if (@need_relocation) {
595 $heavy_txt .= 'foreach my $what (qw(' . join (' ', @need_relocation) .
597 s/^($what=)(['"])(.*?)\2/$1 . $2 . relocate_inc($3) . $2/me;
600 # Currently it only makes sense to do the ... relocation on Unix, so there's
601 # no need to emulate the "which separator for this platform" logic in perl.c -
602 # ':' will always be applicable
603 if ($need_relocation{otherlibdirs}) {
604 $heavy_txt .= << 'EOT';
605 s{^(otherlibdirs=)(['"])(.*?)\2}
606 {$1 . $2 . join ':', map {relocate_inc($_)} split ':', $3 . $2}me;
611 $heavy_txt .= <<'EOT';
612 s/(byteorder=)(['"]).*?\2/$1$2$Config::byteorder$2/m;
614 my $config_sh_len = length $_;
616 our $Config_SH_expanded = "\n$_" . << 'EOVIRTUAL';
619 foreach my $prefix (qw(ccflags ldflags)) {
620 my $value = fetch_string ({}, $prefix);
621 my $withlargefiles = fetch_string ({}, $prefix . "_uselargefiles");
622 if (defined $withlargefiles) {
623 $value =~ s/\Q$withlargefiles\E\b//;
624 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
628 foreach my $prefix (qw(libs libswanted)) {
629 my $value = fetch_string ({}, $prefix);
630 my $withlf = fetch_string ({}, 'libswanted_uselargefiles');
631 next unless defined $withlf;
633 = split(' ', fetch_string ({}, 'libswanted_uselargefiles'));
636 @lflibswanted{@lflibswanted} = ();
637 if ($prefix eq 'libs') {
638 my @libs = grep { /^-l(.+)/ &&
639 not exists $lflibswanted{$1} }
640 split(' ', fetch_string ({}, 'libs'));
641 $value = join(' ', @libs);
643 my @libswanted = grep { not exists $lflibswanted{$_} }
644 split(' ', fetch_string ({}, 'libswanted'));
645 $value = join(' ', @libswanted);
648 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
651 if (open(my $fh, '<', 'cflags')) {
655 if (/^warn="(.+)"$/) {
657 } elsif (/^stdflags="(.+)"$/) {
661 if (defined $ccwarnflags) {
662 $heavy_txt .= "ccwarnflags='$ccwarnflags'\n";
664 if (defined $ccstdflags) {
665 $heavy_txt .= "ccstdflags='$ccstdflags'\n";
669 $heavy_txt .= "EOVIRTUAL\n";
671 $heavy_txt .= <<'ENDOFGIT';
673 # do not have hairy conniptions if this isnt available
674 require 'Config_git.pl';
675 $Config_SH_expanded .= $Config::Git_Data;
677 } or warn "Warning: failed to load Config_git.pl, something strange about this perl...\n";
680 $heavy_txt .= $fetch_string;
682 $config_txt .= <<'ENDOFEND';
685 my($self, $key) = @_;
687 # check for cached value (which may be undef so we use exists not defined)
688 return exists $self->{$key} ? $self->{$key} : $self->fetch_string($key);
693 $heavy_txt .= <<'ENDOFEND';
699 substr($Config_SH_expanded, 1, index($Config_SH_expanded, '=') - 1 );
704 if ($seen_quotes{'"'}) {
705 $heavy_txt .= <<'ENDOFEND';
706 # Find out how the current key's quoted so we can skip to its end.
707 my $quote = substr($Config_SH_expanded,
708 index($Config_SH_expanded, "=", $prevpos)+1, 1);
709 my $pos = index($Config_SH_expanded, qq($quote\n), $prevpos) + 2;
712 # Just ' quotes, so it's much easier.
713 $heavy_txt .= <<'ENDOFEND';
714 my $pos = index($Config_SH_expanded, qq('\n), $prevpos) + 2;
717 $heavy_txt .= <<'ENDOFEND';
718 my $len = index($Config_SH_expanded, "=", $pos) - $pos;
720 $len > 0 ? substr($Config_SH_expanded, $pos, $len) : undef;
724 return 1 if exists($_[0]->{$_[1]});
726 return(index($Config_SH_expanded, "\n$_[1]='") != -1
728 if ($seen_quotes{'"'}) {
729 $heavy_txt .= <<'ENDOFEND';
730 or index($Config_SH_expanded, "\n$_[1]=\"") != -1
733 $heavy_txt .= <<'ENDOFEND';
737 sub STORE { die "\%Config::Config is read-only\n" }
738 *DELETE = *CLEAR = \*STORE; # Typeglob aliasing uses less space
741 substr $Config_SH_expanded, 1, $config_sh_len;
746 return map { chomp; $_ } grep eval{ /^(?:$re)=/ }, split /^/,
751 # implements -V:cfgvar option (see perlrun -V:)
753 # find optional leading, trailing colons; and query-spec
754 my ($notag,$qry,$lncont) = m/^(:)?(.*?)(:)?$/; # flags fore and aft,
755 # map colon-flags to print decorations
756 my $prfx = $notag ? '': "$qry="; # tag-prefix for print
757 my $lnend = $lncont ? ' ' : ";\n"; # line ending for print
759 # all config-vars are by definition \w only, any \W means regex
761 my @matches = config_re($qry);
762 print map "$_$lnend", @matches ? @matches : "$qry: not found" if !$notag;
763 print map { s/\w+=//; "$_$lnend" } @matches ? @matches : "$qry: not found" if $notag;
765 my $v = (exists $Config::Config{$qry}) ? $Config::Config{$qry}
767 $v = 'undef' unless defined $v;
768 print "${prfx}'${v}'$lnend";
773 # Called by the real AUTOLOAD
776 goto \&$Config::AUTOLOAD;
783 $config_txt .= <<'ENDOFSET';
786 my ($value, $v) = $Config_SH_expanded =~ m/^used_aout='(.*)'\s*$/m;
787 for (split ' ', $value) {
788 ($v) = $Config_SH_expanded =~ m/^aout_$_='(.*)'\s*$/m;
789 $preconfig{$_} = $v eq 'undef' ? undef : $v;
792 $preconfig{d_fork} = undef unless $OS2::can_fork; # Some funny cases can't
793 sub TIEHASH { bless {%preconfig} }
795 # Extract the name of the DLL from the makefile to avoid duplication
796 my ($f) = grep -r, qw(GNUMakefile Makefile);
798 if (open my $fh, '<', $f) {
800 $dll = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
803 $config_txt .= <<ENDOFSET if $dll;
804 \$preconfig{dll_name} = '$dll';
807 $config_txt .= <<'ENDOFSET';
814 foreach my $key (keys %Common) {
815 my $value = fetch_string ({}, $key);
816 # Is it safe on the LHS of => ?
817 my $qkey = $key =~ /^[A-Za-z_][A-Za-z0-9_]*$/ ? $key : "'$key'";
818 if (defined $value) {
819 # Quote things for a '' string
820 $value =~ s!\\!\\\\!g;
823 if ($key eq 'otherlibdirs') {
824 $value = "join (':', map {relocate_inc(\$_)} split (':', $value))";
825 } elsif ($need_relocation{$key}) {
826 $value = "relocate_inc($value)";
831 $Common{$key} = "$qkey => $value";
834 if ($Common{byteorder}) {
835 $Common{byteorder} = 'byteorder => $byteorder';
837 my $fast_config = join '', map { " $_,\n" } sort values %Common;
839 # Sanity check needed to stop an infinite loop if Config_heavy.pl fails to
840 # define &launcher for some reason (eg it got truncated)
841 $config_txt .= sprintf <<'ENDOFTIE', $fast_config;
846 require 'Config_heavy.pl';
847 goto \&launcher unless $Config::AUTOLOAD =~ /launcher$/;
848 die "&Config::AUTOLOAD failed on $Config::AUTOLOAD";
851 # tie returns the object, so the value returned to require will be true.
852 tie %%Config, 'Config', {
857 open(CONFIG_POD, '>', $Config_POD) or die "Can't open $Config_POD: $!";
858 print CONFIG_POD <<'ENDOFTAIL';
861 Config - access Perl configuration information
866 if ($Config{usethreads}) {
867 print "has thread support\n"
870 use Config qw(myconfig config_sh config_vars config_re);
878 config_vars(qw(osname archname));
883 The Config module contains all the information that was available to
884 the C<Configure> program at Perl build time (over 900 values).
886 Shell variables from the F<config.sh> file (written by Configure) are
887 stored in the readonly-variable C<%Config>, indexed by their names.
889 Values stored in config.sh as 'undef' are returned as undefined
890 values. The perl C<exists> function can be used to check if a
891 named variable exists.
893 For a description of the variables, please have a look at the
894 Glossary file, as written in the Porting folder, or use the url:
895 http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary
901 Returns a textual summary of the major perl configuration values.
902 See also C<-V> in L<perlrun/Command Switches>.
906 Returns the entire perl configuration information in the form of the
907 original config.sh shell variable assignment script.
909 =item config_re($regex)
911 Like config_sh() but returns, as a list, only the config entries who's
912 names match the $regex.
914 =item config_vars(@names)
916 Prints to STDOUT the values of the named configuration variable. Each is
917 printed on a separate line in the form:
921 Names which are unknown are output as C<name='UNKNOWN';>.
922 See also C<-V:name> in L<perlrun/Command Switches>.
924 =item bincompat_options()
926 Returns a list of C pre-processor options used when compiling this F<perl>
927 binary, which affect its binary compatibility with extensions.
928 C<bincompat_options()> and C<non_bincompat_options()> are shown together in
929 the output of C<perl -V> as I<Compile-time options>.
931 =item non_bincompat_options()
933 Returns a list of C pre-processor options used when compiling this F<perl>
934 binary, which do not affect binary compatibility with extensions.
938 Returns the compile date (as a string), equivalent to what is shown by
941 =item local_patches()
943 Returns a list of the names of locally applied patches, equivalent to what
944 is shown by C<perl -V>.
948 Returns a list of the header files that should be used as dependencies for
949 XS code, for this version of Perl on this platform.
955 Here's a more sophisticated example of using %Config:
962 unless($Config{sig_name} && $Config{sig_num}) {
965 my @names = split ' ', $Config{sig_name};
966 @sig_num{@names} = split ' ', $Config{sig_num};
968 $sig_name[$sig_num{$_}] ||= $_;
972 print "signal #17 = $sig_name[17]\n";
973 if ($sig_num{ALRM}) {
974 print "SIGALRM is $sig_num{ALRM}\n";
979 Because this information is not stored within the perl executable
980 itself it is possible (but unlikely) that the information does not
981 relate to the actual perl binary which is being used to access it.
983 The Config module is installed into the architecture and version
984 specific library directory ($Config{installarchlib}) and it checks the
985 perl version number when loaded.
987 The values stored in config.sh may be either single-quoted or
988 double-quoted. Double-quoted strings are handy for those cases where you
989 need to include escape sequences in the strings. To avoid runtime variable
990 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
991 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
992 or C<\@> in double-quoted strings unless you're willing to deal with the
993 consequences. (The slashes will end up escaped and the C<$> or C<@> will
994 trigger variable interpolation)
998 Most C<Config> variables are determined by the C<Configure> script
999 on platforms supported by it (which is most UNIX platforms). Some
1000 platforms have custom-made C<Config> variables, and may thus not have
1001 some of the variables described below, or may have extraneous variables
1002 specific to that particular port. See the port specific documentation
1009 if ($Opts{glossary}) {
1010 open(GLOS, '<', $Glossary) or die "Can't open $Glossary: $!";
1018 if (s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m) {
1019 my $c = substr $1, 0, 1;
1020 unless ($seen{$c}++) {
1021 print CONFIG_POD <<EOF if $text;
1027 print CONFIG_POD <<EOF;
1038 elsif (!$text || !/\A\t/) {
1039 warn "Expected a Configure variable header",
1040 ($text ? " or another paragraph of description" : () ),
1041 ", instead we got:\n$_";
1044 s/n't/n\00t/g; # leave can't, won't etc untouched
1045 s/^\t\s+(.*)/\n$1/gm; # Indented lines ===> new paragraph
1046 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
1047 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
1048 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
1049 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
1051 (?<! [\w./<\'\"\$] ) # Only standalone file names
1052 (?! e \. g \. ) # Not e.g.
1053 (?! \. \. \. ) # Not ...
1054 (?! \d ) # Not 5.004
1055 (?! read/ ) # Not read/write
1056 (?! etc\. ) # Not etc.
1059 \$ ? # Allow leading $
1060 [\w./]* [./] [\w./]* # Require . or / inside
1062 (?<! \. (?= [\s)] ) ) # Do not include trailing dot
1063 (?! [\w/] ) # Include all of it
1065 (F<$1>)xg; # /usr/local
1066 s/((?<=\s)~\w*)/F<$1>/g; # ~name
1067 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
1068 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
1069 s/n[\0]t/n't/g; # undo can't, won't damage
1072 if ($Opts{glossary}) {
1073 <GLOS>; # Skip the "DO NOT EDIT"
1074 <GLOS>; # Skip the preamble
1080 die "Errors encountered while processing $Glossary. ",
1081 "Header lines are expected to be of the form:\n",
1083 "Maybe there is a malformed header?\n",
1088 print CONFIG_POD <<'ENDOFTAIL';
1094 Information on the git commit from which the current perl binary was compiled
1095 can be found in the variable C<$Config::Git_Data>. The variable is a
1096 structured string that looks something like this:
1098 git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
1099 git_describe='GitLive-blead-1076-gea0c2db'
1100 git_branch='smartmatch'
1101 git_uncommitted_changes=''
1102 git_commit_id_title='Commit id:'
1103 git_commit_date='2009-05-09 17:47:31 +0200'
1105 Its format is not guaranteed not to change over time.
1109 This module contains a good example of how to use tie to implement a
1110 cache and an example of how to make a tied variable readonly to those
1117 close(GLOS) if $Opts{glossary};
1119 print "written $Config_POD\n";
1121 my $orig_config_txt = "";
1122 my $orig_heavy_txt = "";
1126 $orig_config_txt = <$fh> if open $fh, "<", $Config_PM;
1127 $orig_heavy_txt = <$fh> if open $fh, "<", $Config_heavy;
1130 if ($orig_config_txt ne $config_txt or $orig_heavy_txt ne $heavy_txt) {
1131 open CONFIG, ">", $Config_PM or die "Can't open $Config_PM: $!\n";
1132 open CONFIG_HEAVY, ">", $Config_heavy or die "Can't open $Config_heavy: $!\n";
1133 print CONFIG $config_txt;
1134 print CONFIG_HEAVY $heavy_txt;
1135 close(CONFIG_HEAVY);
1137 print "updated $Config_PM\n";
1138 print "updated $Config_heavy\n";
1141 # Now do some simple tests on the Config.pm file we have created
1142 unshift(@INC,'lib');
1144 require $Config_heavy;
1147 die "$0: $Config_PM not valid"
1148 unless $Config{'PERL_CONFIG_SH'} eq 'true';
1150 die "$0: error processing $Config_PM"
1151 if defined($Config{'an impossible name'})
1152 or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
1155 die "$0: error processing $Config_PM"
1156 if eval '$Config{"cc"} = 1'
1157 or eval 'delete $Config{"cc"}'
1162 # Popularity of various entries in %Config, based on a large build and test
1163 # run of code in the Fotango build system:
1181 inc_version_list: 783
1184 usevendorprefix: 642
1205 installsiteman1dir: 489
1206 installsiteman3dir: 489
1207 installvendorman1dir: 489
1208 installvendorman3dir: 489
1212 installsitearch: 344
1217 installprefixexp: 336
1220 installvendorarch: 336
1221 installvendorbin: 336
1222 installvendorlib: 336