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 $in_v = $val !~ /$quote\n/;
255 s,/,::,g if $Extensions{$name};
257 $val =~ s/$quote\n?\z//;
259 my $line = "$name=$quote$val$quote\n";
260 push(@v_others, $line);
261 $seen_quotes{$quote}++;
266 # This is somewhat grim, but I want the code for parsing config.sh here and
267 # now so that I can expand $Config{ivsize} and $Config{ivtype}
269 my $fetch_string = <<'EOT';
271 # Search for it in the big string
273 my($self, $key) = @_;
277 if ($seen_quotes{'"'}) {
278 # We need the full ' and " code
280 $fetch_string .= <<'EOT';
281 return undef unless my ($quote_type, $value) = $Config_SH_expanded =~ /\n$key=(['"])(.*?)\1\n/s;
283 # If we had a double-quote, we'd better eval it so escape
284 # sequences and such can be interpolated. Since the incoming
285 # value is supposed to follow shell rules and not perl rules,
286 # we escape any perl variable markers
288 # Historically, since " 'support' was added in change 1409, the
289 # interpolation was done before the undef. Stick to this arguably buggy
290 # behaviour as we're refactoring.
291 if ($quote_type eq '"') {
292 $value =~ s/\$/\\\$/g;
293 $value =~ s/\@/\\\@/g;
294 eval "\$value = \"$value\"";
297 # So we can say "if $Config{'foo'}".
298 $self->{$key} = $value eq 'undef' ? undef : $value; # cache it
303 # We only have ' delimited.
305 $fetch_string .= <<'EOT';
306 return undef unless $Config_SH_expanded =~ /\n$key=\'(.*?)\'\n/s;
307 # So we can say "if $Config{'foo'}".
308 $self->{$key} = $1 eq 'undef' ? undef : $1;
317 # Calculation for the keys for byteorder
318 # This is somewhat grim, but I need to run fetch_string here.
319 our $Config_SH_expanded = join "\n", '', @v_others;
321 my $t = fetch_string ({}, 'ivtype');
322 my $s = fetch_string ({}, 'ivsize');
324 # byteorder does exist on its own but we overlay a virtual
325 # dynamically recomputed value.
327 # However, ivtype and ivsize will not vary for sane fat binaries
329 my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';
332 if ($s == 4 || $s == 8) {
333 my $list = join ',', reverse(1..$s-1);
335 $byteorder_code = <<"EOT";
338 foreach my \$c ($list) { \$i <<= 8; \$i |= ord(\$c); }
339 our \$byteorder = join('', unpack('$format', pack('$f', \$i)));
342 $byteorder_code = "our \$byteorder = '?'x$s;\n";
347 if (fetch_string({},'userelocatableinc')) {
348 foreach my $what (qw(prefixexp
397 installvendorhtml1dir
398 installvendorhtml3dir
404 push @need_relocation, $what if fetch_string({}, $what) =~ m!^\.\.\./!;
409 @need_relocation{@need_relocation} = @need_relocation;
411 # This can have .../ anywhere:
412 if (fetch_string({}, 'otherlibdirs') =~ m!\.\.\./!) {
413 $need_relocation{otherlibdirs} = 'otherlibdirs';
416 my $relocation_code = <<'EOT';
420 return $libdir unless $libdir =~ s!^\.\.\./!!;
422 if ($prefix =~ s!/[^/]*$!!) {
423 while ($libdir =~ m!^\.\./!) {
424 # Loop while $libdir starts "../" and $prefix still has a trailing
426 last unless $prefix =~ s!/([^/]+)$!!;
427 # but bail out if the directory we picked off the end of $prefix is .
429 if ($1 eq '.' or $1 eq '..') {
430 # Undo! This should be rare, hence code it this way rather than a
431 # check each time before the s!!! above.
432 $prefix = "$prefix/$1";
435 # Remove that leading ../ and loop again
436 substr ($libdir, 0, 3, '');
438 $libdir = "$prefix/$libdir";
444 my $osname = fetch_string({}, 'osname');
445 my $from = $osname eq 'VMS' ? 'PERLSHR image' : 'binary (from libperl)';
446 my $env_cygwin = $osname eq 'cygwin'
447 ? 'push @env, "CYGWIN=\"$ENV{CYGWIN}\"" if $ENV{CYGWIN};' . "\n" : "";
449 $heavy_txt .= sprintf <<'ENDOFBEG', $osname, $osname, $from, $osname, $env_cygwin;
450 # This file was created by configpm when Perl was built. Any changes
451 # made to this file will be lost the next time perl is built.
458 sub bincompat_options {
459 return split ' ', (Internals::V())[0];
462 sub non_bincompat_options {
463 return split ' ', (Internals::V())[1];
467 return (Internals::V())[2]
471 my (undef, undef, undef, @patches) = Internals::V();
476 die "Perl lib was built for '%s' but is being run on '$^O'"
479 my ($bincompat, $non_bincompat, $date, @patches) = Internals::V();
481 my $opts = join ' ', sort split ' ', "$bincompat $non_bincompat";
483 # wrap at 76 columns.
485 $opts =~ s/(?=.{53})(.{1,53}) /$1\n /mg;
487 print Config::myconfig();
488 print "\nCharacteristics of this %s: \n";
490 print " Compile-time options: $opts\n";
493 print " Locally applied patches:\n";
494 print "\t$_\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'
564 $heavy_txt .= join('', sort @v_others) . "!END!\n";
566 # Only need the dynamic byteorder code in Config.pm if 'byteorder' is one of
568 if ($Common{byteorder}) {
569 $config_txt .= $byteorder_code;
571 $heavy_txt .= $byteorder_code;
574 if (@need_relocation) {
575 $heavy_txt .= 'foreach my $what (qw(' . join (' ', @need_relocation) .
577 s/^($what=)(['"])(.*?)\2/$1 . $2 . relocate_inc($3) . $2/me;
580 # Currently it only makes sense to do the ... relocation on Unix, so there's
581 # no need to emulate the "which separator for this platform" logic in perl.c -
582 # ':' will always be applicable
583 if ($need_relocation{otherlibdirs}) {
584 $heavy_txt .= << 'EOT';
585 s{^(otherlibdirs=)(['"])(.*?)\2}
586 {$1 . $2 . join ':', map {relocate_inc($_)} split ':', $3 . $2}me;
591 $heavy_txt .= <<'EOT';
592 s/(byteorder=)(['"]).*?\2/$1$2$Config::byteorder$2/m;
594 my $config_sh_len = length $_;
596 our $Config_SH_expanded = "\n$_" . << 'EOVIRTUAL';
599 foreach my $prefix (qw(ccflags ldflags)) {
600 my $value = fetch_string ({}, $prefix);
601 my $withlargefiles = fetch_string ({}, $prefix . "_uselargefiles");
602 if (defined $withlargefiles) {
603 $value =~ s/\Q$withlargefiles\E\b//;
604 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
608 foreach my $prefix (qw(libs libswanted)) {
609 my $value = fetch_string ({}, $prefix);
610 my $withlf = fetch_string ({}, 'libswanted_uselargefiles');
611 next unless defined $withlf;
613 = split(' ', fetch_string ({}, 'libswanted_uselargefiles'));
616 @lflibswanted{@lflibswanted} = ();
617 if ($prefix eq 'libs') {
618 my @libs = grep { /^-l(.+)/ &&
619 not exists $lflibswanted{$1} }
620 split(' ', fetch_string ({}, 'libs'));
621 $value = join(' ', @libs);
623 my @libswanted = grep { not exists $lflibswanted{$_} }
624 split(' ', fetch_string ({}, 'libswanted'));
625 $value = join(' ', @libswanted);
628 $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
631 if (open(my $fh, "cflags")) {
635 if (/^warn="(.+)"$/) {
637 } elsif (/^stdflags="(.+)"$/) {
641 if (defined $ccwarnflags) {
642 $heavy_txt .= "ccwarnflags='$ccwarnflags'\n";
644 if (defined $ccstdflags) {
645 $heavy_txt .= "ccstdflags='$ccstdflags'\n";
649 $heavy_txt .= "EOVIRTUAL\n";
651 $heavy_txt .= <<'ENDOFGIT';
653 # do not have hairy conniptions if this isnt available
654 require 'Config_git.pl';
655 $Config_SH_expanded .= $Config::Git_Data;
657 } or warn "Warning: failed to load Config_git.pl, something strange about this perl...\n";
660 $heavy_txt .= $fetch_string;
662 $config_txt .= <<'ENDOFEND';
665 my($self, $key) = @_;
667 # check for cached value (which may be undef so we use exists not defined)
668 return exists $self->{$key} ? $self->{$key} : $self->fetch_string($key);
673 $heavy_txt .= <<'ENDOFEND';
679 substr($Config_SH_expanded, 1, index($Config_SH_expanded, '=') - 1 );
684 if ($seen_quotes{'"'}) {
685 $heavy_txt .= <<'ENDOFEND';
686 # Find out how the current key's quoted so we can skip to its end.
687 my $quote = substr($Config_SH_expanded,
688 index($Config_SH_expanded, "=", $prevpos)+1, 1);
689 my $pos = index($Config_SH_expanded, qq($quote\n), $prevpos) + 2;
692 # Just ' quotes, so it's much easier.
693 $heavy_txt .= <<'ENDOFEND';
694 my $pos = index($Config_SH_expanded, qq('\n), $prevpos) + 2;
697 $heavy_txt .= <<'ENDOFEND';
698 my $len = index($Config_SH_expanded, "=", $pos) - $pos;
700 $len > 0 ? substr($Config_SH_expanded, $pos, $len) : undef;
704 return 1 if exists($_[0]->{$_[1]});
706 return(index($Config_SH_expanded, "\n$_[1]='") != -1
708 if ($seen_quotes{'"'}) {
709 $heavy_txt .= <<'ENDOFEND';
710 or index($Config_SH_expanded, "\n$_[1]=\"") != -1
713 $heavy_txt .= <<'ENDOFEND';
717 sub STORE { die "\%Config::Config is read-only\n" }
718 *DELETE = *CLEAR = \*STORE; # Typeglob aliasing uses less space
721 substr $Config_SH_expanded, 1, $config_sh_len;
726 return map { chomp; $_ } grep eval{ /^(?:$re)=/ }, split /^/,
731 # implements -V:cfgvar option (see perlrun -V:)
733 # find optional leading, trailing colons; and query-spec
734 my ($notag,$qry,$lncont) = m/^(:)?(.*?)(:)?$/; # flags fore and aft,
735 # map colon-flags to print decorations
736 my $prfx = $notag ? '': "$qry="; # tag-prefix for print
737 my $lnend = $lncont ? ' ' : ";\n"; # line ending for print
739 # all config-vars are by definition \w only, any \W means regex
741 my @matches = config_re($qry);
742 print map "$_$lnend", @matches ? @matches : "$qry: not found" if !$notag;
743 print map { s/\w+=//; "$_$lnend" } @matches ? @matches : "$qry: not found" if $notag;
745 my $v = (exists $Config::Config{$qry}) ? $Config::Config{$qry}
747 $v = 'undef' unless defined $v;
748 print "${prfx}'${v}'$lnend";
753 # Called by the real AUTOLOAD
756 goto \&$Config::AUTOLOAD;
763 $config_txt .= <<'ENDOFSET';
766 my ($value, $v) = $Config_SH_expanded =~ m/^used_aout='(.*)'\s*$/m;
767 for (split ' ', $value) {
768 ($v) = $Config_SH_expanded =~ m/^aout_$_='(.*)'\s*$/m;
769 $preconfig{$_} = $v eq 'undef' ? undef : $v;
772 $preconfig{d_fork} = undef unless $OS2::can_fork; # Some funny cases can't
773 sub TIEHASH { bless {%preconfig} }
775 # Extract the name of the DLL from the makefile to avoid duplication
776 my ($f) = grep -r, qw(GNUMakefile Makefile);
778 if (open my $fh, '<', $f) {
780 $dll = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
783 $config_txt .= <<ENDOFSET if $dll;
784 \$preconfig{dll_name} = '$dll';
787 $config_txt .= <<'ENDOFSET';
794 foreach my $key (keys %Common) {
795 my $value = fetch_string ({}, $key);
796 # Is it safe on the LHS of => ?
797 my $qkey = $key =~ /^[A-Za-z_][A-Za-z0-9_]*$/ ? $key : "'$key'";
798 if (defined $value) {
799 # Quote things for a '' string
800 $value =~ s!\\!\\\\!g;
803 if ($key eq 'otherlibdirs') {
804 $value = "join (':', map {relocate_inc(\$_)} split (':', $value))";
805 } elsif ($need_relocation{$key}) {
806 $value = "relocate_inc($value)";
811 $Common{$key} = "$qkey => $value";
814 if ($Common{byteorder}) {
815 $Common{byteorder} = 'byteorder => $byteorder';
817 my $fast_config = join '', map { " $_,\n" } sort values %Common;
819 # Sanity check needed to stop an infinite loop if Config_heavy.pl fails to
820 # define &launcher for some reason (eg it got truncated)
821 $config_txt .= sprintf <<'ENDOFTIE', $fast_config;
826 require 'Config_heavy.pl';
827 goto \&launcher unless $Config::AUTOLOAD =~ /launcher$/;
828 die "&Config::AUTOLOAD failed on $Config::AUTOLOAD";
831 # tie returns the object, so the value returned to require will be true.
832 tie %%Config, 'Config', {
837 open(CONFIG_POD, ">$Config_POD") or die "Can't open $Config_POD: $!";
838 print CONFIG_POD <<'ENDOFTAIL';
841 Config - access Perl configuration information
846 if ($Config{usethreads}) {
847 print "has thread support\n"
850 use Config qw(myconfig config_sh config_vars config_re);
858 config_vars(qw(osname archname));
863 The Config module contains all the information that was available to
864 the C<Configure> program at Perl build time (over 900 values).
866 Shell variables from the F<config.sh> file (written by Configure) are
867 stored in the readonly-variable C<%Config>, indexed by their names.
869 Values stored in config.sh as 'undef' are returned as undefined
870 values. The perl C<exists> function can be used to check if a
871 named variable exists.
873 For a description of the variables, please have a look at the
874 Glossary file, as written in the Porting folder, or use the url:
875 http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary
881 Returns a textual summary of the major perl configuration values.
882 See also C<-V> in L<perlrun/Command Switches>.
886 Returns the entire perl configuration information in the form of the
887 original config.sh shell variable assignment script.
889 =item config_re($regex)
891 Like config_sh() but returns, as a list, only the config entries who's
892 names match the $regex.
894 =item config_vars(@names)
896 Prints to STDOUT the values of the named configuration variable. Each is
897 printed on a separate line in the form:
901 Names which are unknown are output as C<name='UNKNOWN';>.
902 See also C<-V:name> in L<perlrun/Command Switches>.
904 =item bincompat_options()
906 Returns a list of C pre-processor options used when compiling this F<perl>
907 binary, which affect its binary compatibility with extensions.
908 C<bincompat_options()> and C<non_bincompat_options()> are shown together in
909 the output of C<perl -V> as I<Compile-time options>.
911 =item non_bincompat_options()
913 Returns a list of C pre-processor options used when compiling this F<perl>
914 binary, which do not affect binary compatibility with extensions.
918 Returns the compile date (as a string), equivalent to what is shown by
921 =item local_patches()
923 Returns a list of the names of locally applied patches, equivalent to what
924 is shown by C<perl -V>.
928 Returns a list of the header files that should be used as dependencies for
929 XS code, for this version of Perl on this platform.
935 Here's a more sophisticated example of using %Config:
942 unless($Config{sig_name} && $Config{sig_num}) {
945 my @names = split ' ', $Config{sig_name};
946 @sig_num{@names} = split ' ', $Config{sig_num};
948 $sig_name[$sig_num{$_}] ||= $_;
952 print "signal #17 = $sig_name[17]\n";
953 if ($sig_num{ALRM}) {
954 print "SIGALRM is $sig_num{ALRM}\n";
959 Because this information is not stored within the perl executable
960 itself it is possible (but unlikely) that the information does not
961 relate to the actual perl binary which is being used to access it.
963 The Config module is installed into the architecture and version
964 specific library directory ($Config{installarchlib}) and it checks the
965 perl version number when loaded.
967 The values stored in config.sh may be either single-quoted or
968 double-quoted. Double-quoted strings are handy for those cases where you
969 need to include escape sequences in the strings. To avoid runtime variable
970 interpolation, any C<$> and C<@> characters are replaced by C<\$> and
971 C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
972 or C<\@> in double-quoted strings unless you're willing to deal with the
973 consequences. (The slashes will end up escaped and the C<$> or C<@> will
974 trigger variable interpolation)
978 Most C<Config> variables are determined by the C<Configure> script
979 on platforms supported by it (which is most UNIX platforms). Some
980 platforms have custom-made C<Config> variables, and may thus not have
981 some of the variables described below, or may have extraneous variables
982 specific to that particular port. See the port specific documentation
989 if ($Opts{glossary}) {
990 open(GLOS, "<$Glossary") or die "Can't open $Glossary: $!";
998 if (s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m) {
999 my $c = substr $1, 0, 1;
1000 unless ($seen{$c}++) {
1001 print CONFIG_POD <<EOF if $text;
1007 print CONFIG_POD <<EOF;
1018 elsif (!$text || !/\A\t/) {
1019 warn "Expected a Configure variable header",
1020 ($text ? " or another paragraph of description" : () ),
1021 ", instead we got:\n$_";
1024 s/n't/n\00t/g; # leave can't, won't etc untouched
1025 s/^\t\s+(.*)/\n$1/gm; # Indented lines ===> new paragraph
1026 s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
1027 s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
1028 s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
1029 s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
1031 (?<! [\w./<\'\"\$] ) # Only standalone file names
1032 (?! e \. g \. ) # Not e.g.
1033 (?! \. \. \. ) # Not ...
1034 (?! \d ) # Not 5.004
1035 (?! read/ ) # Not read/write
1036 (?! etc\. ) # Not etc.
1039 \$ ? # Allow leading $
1040 [\w./]* [./] [\w./]* # Require . or / inside
1042 (?<! \. (?= [\s)] ) ) # Do not include trailing dot
1043 (?! [\w/] ) # Include all of it
1045 (F<$1>)xg; # /usr/local
1046 s/((?<=\s)~\w*)/F<$1>/g; # ~name
1047 s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
1048 s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
1049 s/n[\0]t/n't/g; # undo can't, won't damage
1052 if ($Opts{glossary}) {
1053 <GLOS>; # Skip the "DO NOT EDIT"
1054 <GLOS>; # Skip the preamble
1060 die "Errors encountered while processing $Glossary. ",
1061 "Header lines are expected to be of the form:\n",
1063 "Maybe there is a malformed header?\n",
1068 print CONFIG_POD <<'ENDOFTAIL';
1074 Information on the git commit from which the current perl binary was compiled
1075 can be found in the variable C<$Config::Git_Data>. The variable is a
1076 structured string that looks something like this:
1078 git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
1079 git_describe='GitLive-blead-1076-gea0c2db'
1080 git_branch='smartmatch'
1081 git_uncommitted_changes=''
1082 git_commit_id_title='Commit id:'
1083 git_commit_date='2009-05-09 17:47:31 +0200'
1085 Its format is not guaranteed not to change over time.
1089 This module contains a good example of how to use tie to implement a
1090 cache and an example of how to make a tied variable readonly to those
1097 close(GLOS) if $Opts{glossary};
1099 print "written $Config_POD\n";
1101 my $orig_config_txt = "";
1102 my $orig_heavy_txt = "";
1106 $orig_config_txt = <$fh> if open $fh, "<", $Config_PM;
1107 $orig_heavy_txt = <$fh> if open $fh, "<", $Config_heavy;
1110 if ($orig_config_txt ne $config_txt or $orig_heavy_txt ne $heavy_txt) {
1111 open CONFIG, ">", $Config_PM or die "Can't open $Config_PM: $!\n";
1112 open CONFIG_HEAVY, ">", $Config_heavy or die "Can't open $Config_heavy: $!\n";
1113 print CONFIG $config_txt;
1114 print CONFIG_HEAVY $heavy_txt;
1115 close(CONFIG_HEAVY);
1117 print "updated $Config_PM\n";
1118 print "updated $Config_heavy\n";
1121 # Now do some simple tests on the Config.pm file we have created
1122 unshift(@INC,'lib');
1124 require $Config_heavy;
1127 die "$0: $Config_PM not valid"
1128 unless $Config{'PERL_CONFIG_SH'} eq 'true';
1130 die "$0: error processing $Config_PM"
1131 if defined($Config{'an impossible name'})
1132 or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
1135 die "$0: error processing $Config_PM"
1136 if eval '$Config{"cc"} = 1'
1137 or eval 'delete $Config{"cc"}'
1142 # Popularity of various entries in %Config, based on a large build and test
1143 # run of code in the Fotango build system:
1161 inc_version_list: 783
1164 usevendorprefix: 642
1185 installsiteman1dir: 489
1186 installsiteman3dir: 489
1187 installvendorman1dir: 489
1188 installvendorman3dir: 489
1192 installsitearch: 344
1197 installprefixexp: 336
1200 installvendorarch: 336
1201 installvendorbin: 336
1202 installvendorlib: 336