-#!./perl
+#!./miniperl -w
+my $config_pm = $ARGV[0] || 'lib/Config.pm';
+my $glossary = $ARGV[1] || 'Porting/Glossary';
@ARGV = "./config.sh";
-undef $/;
-$_ = <>;
-s:^#!/bin/sh\n::;
-s/'undef'/undef/g;
-s/\n(\w+)=/;\n\$Config{'$1'} = /g;
-s/;\n\$Config/\n\$Config/;
-
-open STDOUT, ">lib/Config.pm"
- or die "Can't open lib/Config.pm: $!\n";
-$myver = sprintf("%.3f", $]);
-print <<"ENDOFBEG";
+# list names to put first (and hence lookup fastest)
+@fast = qw(archname osname osvers prefix libs libpth
+ dynamic_ext static_ext extensions dlsrc so
+ sig_name sig_num cc ccflags cppflags
+ privlibexp archlibexp installprivlib installarchlib
+ sharpbang startsh shsharp
+);
+
+# names of things which may need to have slashes changed to double-colons
+@extensions = qw(dynamic_ext static_ext extensions known_extensions);
+
+
+open CONFIG, ">$config_pm" or die "Can't open $config_pm: $!\n";
+$myver = sprintf "v%vd", $^V;
+
+print CONFIG <<'ENDOFBEG_NOQ', <<"ENDOFBEG";
package Config;
-require Exporter;
-\@ISA = (Exporter);
-\@EXPORT = qw(%Config);
+use Exporter ();
+@EXPORT = qw(%Config);
+@EXPORT_OK = qw(myconfig config_sh config_vars);
+
+# Define our own import method to avoid pulling in the full Exporter:
+sub import {
+ my $pkg = shift;
+ @_ = @EXPORT unless @_;
+ my @func = grep {$_ ne '%Config'} @_;
+ local $Exporter::ExportLevel = 1;
+ Exporter::import('Config', @func) if @func;
+ return if @func == @_;
+ my $callpkg = caller(0);
+ *{"$callpkg\::Config"} = \%Config;
+}
+
+ENDOFBEG_NOQ
+die "Perl lib version ($myver) doesn't match executable version (\$])"
+ unless \$^V;
-\$] == $myver or die sprintf
- "Perl lib version ($myver) doesn't match executable version (%.3f)\\n", \$];
+\$^V eq $myver
+ or die "Perl lib version ($myver) doesn't match executable version (" .
+ (sprintf "v%vd",\$^V) . ")";
+
+# This file was created by configpm when Perl was built. Any changes
+# made to this file will be lost the next time perl is built.
ENDOFBEG
-print $_;
+@fast{@fast} = @fast;
+@extensions{@extensions} = @extensions;
+@non_v=();
+@v_fast=();
+@v_others=();
+$in_v = 0;
+
+while (<>) {
+ next if m:^#!/bin/sh:;
+ # Catch PERL_CONFIG_SH=true and PERL_VERSION=n line from Configure.
+ s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/;
+ my ($k,$v) = ($1,$2);
+ # grandfather PATCHLEVEL and SUBVERSION and CONFIG
+ if ($k) {
+ if ($k eq 'PERL_VERSION') {
+ push @v_others, "PATCHLEVEL='$v'\n";
+ }
+ elsif ($k eq 'PERL_SUBVERSION') {
+ push @v_others, "SUBVERSION='$v'\n";
+ }
+ elsif ($k eq 'PERL_CONFIG_SH') {
+ push @v_others, "CONFIG='$v'\n";
+ }
+ }
+ # We can delimit things in config.sh with either ' or ".
+ unless ($in_v or m/^(\w+)=(['"])(.*\n)/){
+ push(@non_v, "#$_"); # not a name='value' line
+ next;
+ }
+ $quote = $2;
+ if ($in_v) { $val .= $_; }
+ else { ($name,$val) = ($1,$3); }
+ $in_v = $val !~ /$quote\n/;
+ next if $in_v;
+ if ($extensions{$name}) { s,/,::,g }
+ if (!$fast{$name}){ push(@v_others, "$name=$quote$val"); next; }
+ push(@v_fast,"$name=$quote$val");
+}
+
+foreach(@non_v){ print CONFIG $_ }
+
+print CONFIG "\n",
+ "my \$config_sh = <<'!END!';\n",
+ join("", @v_fast, sort @v_others),
+ "!END!\n\n";
+
+# copy config summary format from the myconfig.SH script
+
+print CONFIG "my \$summary = <<'!END!';\n";
+
+open(MYCONFIG,"<myconfig.SH") || die "open myconfig.SH failed: $!";
+1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
+do { print CONFIG $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
+close(MYCONFIG);
+
+print CONFIG "\n!END!\n", <<'EOT';
+my $summary_expanded = 0;
+
+sub myconfig {
+ return $summary if $summary_expanded;
+ $summary =~ s{\$(\w+)}
+ { my $c = $Config{$1}; defined($c) ? $c : 'undef' }ge;
+ $summary_expanded = 1;
+ $summary;
+}
+EOT
+
+# ----
+
+print CONFIG <<'ENDOFEND';
+
+sub FETCH {
+ # check for cached value (which may be undef so we use exists not defined)
+ return $_[0]->{$_[1]} if (exists $_[0]->{$_[1]});
+
+ # Search for it in the big string
+ my($value, $start, $marker, $quote_type);
+
+ $quote_type = "'";
+ # Virtual entries.
+ if ($_[1] eq 'byteorder') {
+ # byteorder does exist on its own but we overlay a virtual
+ # dynamically recomputed value.
+ my $t = $Config{ivtype};
+ my $s = $Config{ivsize};
+ my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';
+ if ($s == 4 || $s == 8) {
+ my $i = 0;
+ foreach my $c (reverse(2..$s)) { $i |= ord($c); $i <<= 8 }
+ $i |= ord(1);
+ $value = join('', unpack('a'x$s, pack($f, $i)));
+ } else {
+ $value = '?'x$s;
+ }
+ } elsif ($_[1] =~ /^((?:cc|ld)flags|libs(?:wanted)?)_nolargefiles/) {
+ # These are purely virtual, they do not exist, but need to
+ # be computed on demand for largefile-incapable extensions.
+ my $key = "${1}_uselargefiles";
+ $value = $Config{$1};
+ my $withlargefiles = $Config{$key};
+ if ($key =~ /^(?:cc|ld)flags_/) {
+ $value =~ s/\Q$withlargefiles\E\b//;
+ } elsif ($key =~ /^libs/) {
+ my @lflibswanted = split(' ', $Config{libswanted_uselargefiles});
+ if (@lflibswanted) {
+ my %lflibswanted;
+ @lflibswanted{@lflibswanted} = ();
+ if ($key =~ /^libs_/) {
+ my @libs = grep { /^-l(.+)/ &&
+ not exists $lflibswanted{$1} }
+ split(' ', $Config{libs});
+ $Config{libs} = join(' ', @libs);
+ } elsif ($key =~ /^libswanted_/) {
+ my @libswanted = grep { not exists $lflibswanted{$_} }
+ split(' ', $Config{libswanted});
+ $Config{libswanted} = join(' ', @libswanted);
+ }
+ }
+ }
+ } else {
+ $marker = "$_[1]=";
+ # return undef unless (($value) = $config_sh =~ m/^$_[1]='(.*)'\s*$/m);
+ # Check for the common case, ' delimeted
+ $start = index($config_sh, "\n$marker$quote_type");
+ # If that failed, check for " delimited
+ if ($start == -1) {
+ $quote_type = '"';
+ $start = index($config_sh, "\n$marker$quote_type");
+ }
+ return undef if ( ($start == -1) && # in case it's first
+ (substr($config_sh, 0, length($marker)) ne $marker) );
+ if ($start == -1) {
+ # It's the very first thing we found. Skip $start forward
+ # and figure out the quote mark after the =.
+ $start = length($marker) + 1;
+ $quote_type = substr($config_sh, $start - 1, 1);
+ }
+ else {
+ $start += length($marker) + 2;
+ }
+ $value = substr($config_sh, $start,
+ index($config_sh, "$quote_type\n", $start) - $start);
+ }
+ # If we had a double-quote, we'd better eval it so escape
+ # sequences and such can be interpolated. Since the incoming
+ # value is supposed to follow shell rules and not perl rules,
+ # we escape any perl variable markers
+ if ($quote_type eq '"') {
+ $value =~ s/\$/\\\$/g;
+ $value =~ s/\@/\\\@/g;
+ eval "\$value = \"$value\"";
+ }
+ #$value = sprintf($value) if $quote_type eq '"';
+ # So we can say "if $Config{'foo'}".
+ $value = undef if $value eq 'undef';
+ $_[0]->{$_[1]} = $value; # cache it
+ return $value;
+}
+
+my $prevpos = 0;
+
+sub FIRSTKEY {
+ $prevpos = 0;
+ # my($key) = $config_sh =~ m/^(.*?)=/;
+ substr($config_sh, 0, index($config_sh, '=') );
+ # $key;
+}
+
+sub NEXTKEY {
+ # Find out how the current key's quoted so we can skip to its end.
+ my $quote = substr($config_sh, index($config_sh, "=", $prevpos)+1, 1);
+ my $pos = index($config_sh, qq($quote\n), $prevpos) + 2;
+ my $len = index($config_sh, "=", $pos) - $pos;
+ $prevpos = $pos;
+ $len > 0 ? substr($config_sh, $pos, $len) : undef;
+}
+
+sub EXISTS {
+ # exists($_[0]->{$_[1]}) or $config_sh =~ m/^$_[1]=/m;
+ exists($_[0]->{$_[1]}) or
+ index($config_sh, "\n$_[1]='") != -1 or
+ substr($config_sh, 0, length($_[1])+2) eq "$_[1]='" or
+ index($config_sh, "\n$_[1]=\"") != -1 or
+ substr($config_sh, 0, length($_[1])+2) eq "$_[1]=\"" or
+ $_[1] =~ /^(?:(?:cc|ld)flags|libs(?:wanted)?)_nolargefiles$/;
+}
+
+sub STORE { die "\%Config::Config is read-only\n" }
+sub DELETE { &STORE }
+sub CLEAR { &STORE }
+
+
+sub config_sh {
+ $config_sh
+}
+
+sub config_re {
+ my $re = shift;
+ my @matches = grep /^$re=/, split /^/, $config_sh;
+ @matches ? (print @matches) : print "$re: not found\n";
+}
+
+sub config_vars {
+ foreach(@_){
+ config_re($_), next if /\W/;
+ my $v=(exists $Config{$_}) ? $Config{$_} : 'UNKNOWN';
+ $v='undef' unless defined $v;
+ print "$_='$v';\n";
+ }
+}
+
+ENDOFEND
+
+if ($^O eq 'os2') {
+ print CONFIG <<'ENDOFSET';
+my %preconfig;
+if ($OS2::is_aout) {
+ my ($value, $v) = $config_sh =~ m/^used_aout='(.*)'\s*$/m;
+ for (split ' ', $value) {
+ ($v) = $config_sh =~ m/^aout_$_='(.*)'\s*$/m;
+ $preconfig{$_} = $v eq 'undef' ? undef : $v;
+ }
+}
+$preconfig{d_fork} = undef unless $OS2::can_fork; # Some funny cases can't
+sub TIEHASH { bless {%preconfig} }
+ENDOFSET
+ # Extract the name of the DLL from the makefile to avoid duplication
+ my ($f) = grep -r, qw(GNUMakefile Makefile);
+ my $dll;
+ if (open my $fh, '<', $f) {
+ while (<$fh>) {
+ $dll = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
+ }
+ }
+ print CONFIG <<ENDOFSET if $dll;
+\$preconfig{dll_name} = '$dll';
+ENDOFSET
+} else {
+ print CONFIG <<'ENDOFSET';
+sub TIEHASH { bless {} }
+ENDOFSET
+}
+
+print CONFIG <<'ENDOFTAIL';
+
+# avoid Config..Exporter..UNIVERSAL search for DESTROY then AUTOLOAD
+sub DESTROY { }
+
+tie %Config, 'Config';
+
+1;
+__END__
+
+=head1 NAME
+
+Config - access Perl configuration information
+
+=head1 SYNOPSIS
+
+ use Config;
+ if ($Config{'cc'} =~ /gcc/) {
+ print "built by gcc\n";
+ }
+
+ use Config qw(myconfig config_sh config_vars);
+
+ print myconfig();
+
+ print config_sh();
+
+ config_vars(qw(osname archname));
+
+
+=head1 DESCRIPTION
+
+The Config module contains all the information that was available to
+the C<Configure> program at Perl build time (over 900 values).
+
+Shell variables from the F<config.sh> file (written by Configure) are
+stored in the readonly-variable C<%Config>, indexed by their names.
+
+Values stored in config.sh as 'undef' are returned as undefined
+values. The perl C<exists> function can be used to check if a
+named variable exists.
+
+=over 4
+
+=item myconfig()
+
+Returns a textual summary of the major perl configuration values.
+See also C<-V> in L<perlrun/Switches>.
+
+=item config_sh()
+
+Returns the entire perl configuration information in the form of the
+original config.sh shell variable assignment script.
+
+=item config_vars(@names)
+
+Prints to STDOUT the values of the named configuration variable. Each is
+printed on a separate line in the form:
+
+ name='value';
+
+Names which are unknown are output as C<name='UNKNOWN';>.
+See also C<-V:name> in L<perlrun/Switches>.
+
+=back
+
+=head1 EXAMPLE
+
+Here's a more sophisticated example of using %Config:
+
+ use Config;
+ use strict;
+
+ my %sig_num;
+ my @sig_name;
+ unless($Config{sig_name} && $Config{sig_num}) {
+ die "No sigs?";
+ } else {
+ my @names = split ' ', $Config{sig_name};
+ @sig_num{@names} = split ' ', $Config{sig_num};
+ foreach (@names) {
+ $sig_name[$sig_num{$_}] ||= $_;
+ }
+ }
+
+ print "signal #17 = $sig_name[17]\n";
+ if ($sig_num{ALRM}) {
+ print "SIGALRM is $sig_num{ALRM}\n";
+ }
+
+=head1 WARNING
+
+Because this information is not stored within the perl executable
+itself it is possible (but unlikely) that the information does not
+relate to the actual perl binary which is being used to access it.
+
+The Config module is installed into the architecture and version
+specific library directory ($Config{installarchlib}) and it checks the
+perl version number when loaded.
+
+The values stored in config.sh may be either single-quoted or
+double-quoted. Double-quoted strings are handy for those cases where you
+need to include escape sequences in the strings. To avoid runtime variable
+interpolation, any C<$> and C<@> characters are replaced by C<\$> and
+C<\@>, respectively. This isn't foolproof, of course, so don't embed C<\$>
+or C<\@> in double-quoted strings unless you're willing to deal with the
+consequences. (The slashes will end up escaped and the C<$> or C<@> will
+trigger variable interpolation)
+
+=head1 GLOSSARY
+
+Most C<Config> variables are determined by the C<Configure> script
+on platforms supported by it (which is most UNIX platforms). Some
+platforms have custom-made C<Config> variables, and may thus not have
+some of the variables described below, or may have extraneous variables
+specific to that particular port. See the port specific documentation
+in such cases.
+
+ENDOFTAIL
+
+open(GLOS, "<$glossary") or die "Can't open $glossary: $!";
+%seen = ();
+$text = 0;
+$/ = '';
+
+sub process {
+ if (s/\A(\w*)\s+\(([\w.]+)\):\s*\n(\t?)/=item C<$1>\n\nFrom F<$2>:\n\n/m) {
+ my $c = substr $1, 0, 1;
+ unless ($seen{$c}++) {
+ print CONFIG <<EOF if $text;
+=back
+
+EOF
+ print CONFIG <<EOF;
+=head2 $c
+
+=over 4
+
+EOF
+ $text = 1;
+ }
+ }
+ elsif (!$text || !/\A\t/) {
+ warn "Expected a Configure variable header",
+ ($text ? " or another paragraph of description" : () );
+ }
+ s/n't/n\00t/g; # leave can't, won't etc untouched
+ s/^\t\s+(.*)/\n\t$1\n/gm; # Indented lines ===> paragraphs
+ s/^(?<!\n\n)\t(.*)/$1/gm; # Not indented lines ===> text
+ s{([\'\"])(?=[^\'\"\s]*[./][^\'\"\s]*\1)([^\'\"\s]+)\1}(F<$2>)g; # '.o'
+ s{([\'\"])([^\'\"\s]+)\1}(C<$2>)g; # "date" command
+ s{\'([A-Za-z_\- *=/]+)\'}(C<$1>)g; # 'ln -s'
+ s{
+ (?<! [\w./<\'\"] ) # Only standalone file names
+ (?! e \. g \. ) # Not e.g.
+ (?! \. \. \. ) # Not ...
+ (?! \d ) # Not 5.004
+ ( [\w./]* [./] [\w./]* ) # Require . or / inside
+ (?<! \. (?= \s ) ) # Do not include trailing dot
+ (?! [\w/] ) # Include all of it
+ }
+ (F<$1>)xg; # /usr/local
+ s/((?<=\s)~\w*)/F<$1>/g; # ~name
+ s/(?<![.<\'\"])\b([A-Z_]{2,})\b(?![\'\"])/C<$1>/g; # UNISTD
+ s/(?<![.<\'\"])\b(?!the\b)(\w+)\s+macro\b/C<$1> macro/g; # FILE_cnt macro
+ s/n[\0]t/n't/g; # undo can't, won't damage
+}
+
+<GLOS>; # Skip the preamble
+while (<GLOS>) {
+ process;
+ print CONFIG;
+}
+
+print CONFIG <<'ENDOFTAIL';
+
+=back
+
+=head1 NOTE
+
+This module contains a good example of how to use tie to implement a
+cache and an example of how to make a tied variable readonly to those
+outside of it.
+
+=cut
+
+ENDOFTAIL
+
+close(CONFIG);
+close(GLOS);
+
+# Now do some simple tests on the Config.pm file we have created
+unshift(@INC,'lib');
+require $config_pm;
+import Config;
+
+die "$0: $config_pm not valid"
+ unless $Config{'PERL_CONFIG_SH'} eq 'true';
+
+die "$0: error processing $config_pm"
+ if defined($Config{'an impossible name'})
+ or $Config{'PERL_CONFIG_SH'} ne 'true' # test cache
+ ;
+
+die "$0: error processing $config_pm"
+ if eval '$Config{"cc"} = 1'
+ or eval 'delete $Config{"cc"}'
+ ;
+
+
+exit 0;
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