File: configpm

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#!./miniperl -w
#
# configpm
#
# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
# 2002, 2003, 2004, 2005, 2006, 2007 Larry Wall and others.
#
#
# Regenerate the files
#
#    lib/Config.pm
#    lib/Config_heavy.pl
#    lib/Config.pod
#
#
# from the contents of the static files
#
#    Porting/Glossary
#    myconfig.SH
#
# and from the contents of the Configure-generated file
#
#    config.sh
#
#
# It will only update Config.pm and Config_heavy.pl if the contents of
# either file would be different. Note that *both* files are updated in
# this case, since for example an extension makefile that has a dependency
# on Config.pm should trigger even if only Config_heavy.pl has changed.

sub usage { die <<EOF }
usage: $0  [ options ]
    --no-glossary       don't include Porting/Glossary in lib/Config.pod
    --chdir=dir         change directory before writing files
EOF

use strict;
use vars qw(%Config $Config_SH_expanded);

my $how_many_common = 22;

# commonly used names to precache (and hence lookup fastest)
my %Common;

while ($how_many_common--) {
    $_ = <DATA>;
    chomp;
    /^(\S+):\s*(\d+)$/ or die "Malformed line '$_'";
    $Common{$1} = $1;
}

# Post 37589e1eefb1bd62 DynaLoader defaults to reading these at runtime.
# Ideally we're redo the data below, but Fotango's build system made it
# wonderfully easy to instrument, and no longer exists.
$Common{$_} = $_ foreach qw(dlext so);

# names of things which may need to have slashes changed to double-colons
my %Extensions = map {($_,$_)}
                 qw(dynamic_ext static_ext extensions known_extensions);

# The plan is that this information is used by ExtUtils::MakeMaker to generate
# Makefile dependencies, rather than hardcoding a list, which has become out
# of date. However, currently, MM_Unix.pm and MM_VMS.pm have *different* lists,
# *and* descrip_mms.template doesn't actually install all the headers.
# The "Unix" list seems to (attempt to) avoid the generated headers, which I'm
# not sure is the right thing to do. Also, not certain whether it would be
# easier to parse MANIFEST to get these (adding config.h, and potentially
# removing others), but for now, stick to a hard coded list.

# Could use a map to add ".h", but I suspect that it's easier to use literals,
# so that anyone using grep will find them
# This is the list from MM_VMS, plus pad.h, parser.h, utf8.h
# which it installs. It *doesn't* install perliol.h - FIXME.
my @header_files = qw(EXTERN.h INTERN.h XSUB.h av.h config.h cop.h cv.h
		      embed.h embedvar.h form.h gv.h handy.h hv.h hv_func.h intrpvar.h
		      iperlsys.h keywords.h mg.h nostdio.h op.h opcode.h
		      pad.h parser.h patchlevel.h perl.h perlio.h perlsdio.h
		      perlvars.h perly.h pp.h pp_proto.h proto.h
		      regcomp.h regexp.h regnodes.h scope.h sv.h thread.h utf8.h
		      util.h);

push @header_files,
    $^O eq 'VMS' ? 'vmsish.h' : qw(dosish.h perliol.h time64.h unixish.h);

my $header_files = '    return qw(' . join(' ', sort @header_files) . ');';
$header_files =~ s/(?=.{64})   # If line is still overlength
		   (.{1,64})\  # Split at the last convenient space
		  /$1\n              /gx;

# allowed opts as well as specifies default and initial values
my %Allowed_Opts = (
    'glossary' => 1,  # --no-glossary  - no glossary file inclusion,
                      #                  for compactness
    'chdir'    => '', # --chdir=dir    - change directory before writing files
);

sub opts {
    # user specified options
    my %given_opts = (
        # --opt=smth
        (map {/^--([\-_\w]+)=(.*)$/} @ARGV),
        # --opt --no-opt --noopt
        (map {/^no-?(.*)$/i?($1=>0):($_=>1)} map {/^--([\-_\w]+)$/} @ARGV),
    );

    my %opts = (%Allowed_Opts, %given_opts);

    for my $opt (grep {!exists $Allowed_Opts{$_}} keys %given_opts) {
        warn "option '$opt' is not recognized";
	usage;
    }
    @ARGV = grep {!/^--/} @ARGV;

    return %opts;
}


my %Opts = opts();

if ($Opts{chdir}) {
    chdir $Opts{chdir} or die "$0: could not chdir $Opts{chdir}: $!"
}

my ($Config_SH, $Config_PM, $Config_heavy, $Config_POD);
my $Glossary = 'Porting/Glossary';

$Config_PM = "lib/Config.pm";
$Config_POD = "lib/Config.pod";
$Config_SH = "config.sh";

($Config_heavy = $Config_PM) =~ s/\.pm$/_heavy.pl/;
die "Can't automatically determine name for Config_heavy.pl from '$Config_PM'"
  if $Config_heavy eq $Config_PM;

my $config_txt;
my $heavy_txt;

my $export_funcs = <<'EOT';
my %Export_Cache = (myconfig => 1, config_sh => 1, config_vars => 1,
		    config_re => 1, compile_date => 1, local_patches => 1,
		    bincompat_options => 1, non_bincompat_options => 1,
		    header_files => 1);
EOT

my %export_ok = eval $export_funcs or die;

$config_txt .= sprintf << 'EOT', $], $export_funcs;
# 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.

# for a description of the variables, please have a look at the
# Glossary file, as written in the Porting folder, or use the url:
# http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary

package Config;
use strict;
use warnings;
use vars '%%Config', '$VERSION';

$VERSION = "%s";

# Skip @Config::EXPORT because it only contains %%Config, which we special
# case below as it's not a function. @Config::EXPORT won't change in the
# lifetime of Perl 5.
%s
@Config::EXPORT = qw(%%Config);
@Config::EXPORT_OK = keys %%Export_Cache;

# Need to stub all the functions to make code such as print Config::config_sh
# keep working

EOT

$config_txt .= "sub $_;\n" foreach sort keys %export_ok;

my $myver = sprintf "%vd", $^V;

$config_txt .= sprintf <<'ENDOFBEG', ($myver) x 3;

# Define our own import method to avoid pulling in the full Exporter:
sub import {
    shift;
    @_ = @Config::EXPORT unless @_;

    my @funcs = grep $_ ne '%%Config', @_;
    my $export_Config = @funcs < @_ ? 1 : 0;

    no strict 'refs';
    my $callpkg = caller(0);
    foreach my $func (@funcs) {
	die qq{"$func" is not exported by the Config module\n}
	    unless $Export_Cache{$func};
	*{$callpkg.'::'.$func} = \&{$func};
    }

    *{"$callpkg\::Config"} = \%%Config if $export_Config;
    return;
}

die "$0: Perl lib version (%s) doesn't match executable '$^X' version ($])"
    unless $^V;

$^V eq %s
    or die sprintf "%%s: Perl lib version (%s) doesn't match executable '$^X' version (%%vd)", $0, $^V;

ENDOFBEG


my @non_v    = ();
my @v_others = ();
my $in_v     = 0;
my %Data     = ();
my $quote;


my %seen_quotes;
{
  my ($name, $val);
  open(CONFIG_SH, $Config_SH) || die "Can't open $Config_SH: $!";
  while (<CONFIG_SH>) {
    next if m:^#!/bin/sh:;

    # Catch PERL_CONFIG_SH=true and PERL_VERSION=n line from Configure.
    s/^(\w+)=(true|\d+)\s*$/$1='$2'\n/ or m/^(\w+)='(.*)'$/;
    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;
    }
    if ($in_v) { 
        $val .= $_;
    }
    else { 
	$quote = $2;
        ($name,$val) = ($1,$3); 
    }
    $in_v = $val !~ /$quote\n/;
    next if $in_v;

    s,/,::,g if $Extensions{$name};

    $val =~ s/$quote\n?\z//;

    my $line = "$name=$quote$val$quote\n";
    push(@v_others, $line);
    $seen_quotes{$quote}++;
  }
  close CONFIG_SH;
}

# This is somewhat grim, but I want the code for parsing config.sh here and
# now so that I can expand $Config{ivsize} and $Config{ivtype}

my $fetch_string = <<'EOT';

# Search for it in the big string
sub fetch_string {
    my($self, $key) = @_;

EOT

if ($seen_quotes{'"'}) {
    # We need the full ' and " code

$fetch_string .= <<'EOT';
    return undef unless my ($quote_type, $value) = $Config_SH_expanded =~ /\n$key=(['"])(.*?)\1\n/s;

    # 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

    # Historically, since " 'support' was added in change 1409, the
    # interpolation was done before the undef. Stick to this arguably buggy
    # behaviour as we're refactoring.
    if ($quote_type eq '"') {
	$value =~ s/\$/\\\$/g;
	$value =~ s/\@/\\\@/g;
	eval "\$value = \"$value\"";
    }

    # So we can say "if $Config{'foo'}".
    $self->{$key} = $value eq 'undef' ? undef : $value; # cache it
}
EOT

} else {
    # We only have ' delimited.

$fetch_string .= <<'EOT';
    return undef unless $Config_SH_expanded =~ /\n$key=\'(.*?)\'\n/s;
    # So we can say "if $Config{'foo'}".
    $self->{$key} = $1 eq 'undef' ? undef : $1;
}
EOT

}

eval $fetch_string;
die if $@;

# Calculation for the keys for byteorder
# This is somewhat grim, but I need to run fetch_string here.
our $Config_SH_expanded = join "\n", '', @v_others;

my $t = fetch_string ({}, 'ivtype');
my $s = fetch_string ({}, 'ivsize');

# byteorder does exist on its own but we overlay a virtual
# dynamically recomputed value.

# However, ivtype and ivsize will not vary for sane fat binaries

my $f = $t eq 'long' ? 'L!' : $s == 8 ? 'Q': 'I';

my $byteorder_code;
if ($s == 4 || $s == 8) {
    my $list = join ',', reverse(1..$s-1);
    my $format = 'a'x$s;
    $byteorder_code = <<"EOT";

my \$i = ord($s);
foreach my \$c ($list) { \$i <<= 8; \$i |= ord(\$c); }
our \$byteorder = join('', unpack('$format', pack('$f', \$i)));
EOT
} else {
    $byteorder_code = "our \$byteorder = '?'x$s;\n";
}

my @need_relocation;

if (fetch_string({},'userelocatableinc')) {
    foreach my $what (qw(prefixexp

			 archlibexp
			 html1direxp
			 html3direxp
			 man1direxp
			 man3direxp
			 privlibexp
			 scriptdirexp
			 sitearchexp
			 sitebinexp
			 sitehtml1direxp
			 sitehtml3direxp
			 sitelibexp
			 siteman1direxp
			 siteman3direxp
			 sitescriptexp
			 vendorarchexp
			 vendorbinexp
			 vendorhtml1direxp
			 vendorhtml3direxp
			 vendorlibexp
			 vendorman1direxp
			 vendorman3direxp
			 vendorscriptexp

			 siteprefixexp
			 sitelib_stem
			 vendorlib_stem

			 installarchlib
			 installhtml1dir
			 installhtml3dir
			 installman1dir
			 installman3dir
			 installprefix
			 installprefixexp
			 installprivlib
			 installscript
			 installsitearch
			 installsitebin
			 installsitehtml1dir
			 installsitehtml3dir
			 installsitelib
			 installsiteman1dir
			 installsiteman3dir
			 installsitescript
			 installvendorarch
			 installvendorbin
			 installvendorhtml1dir
			 installvendorhtml3dir
			 installvendorlib
			 installvendorman1dir
			 installvendorman3dir
			 installvendorscript
			 )) {
	push @need_relocation, $what if fetch_string({}, $what) =~ m!^\.\.\./!;
    }
}

my %need_relocation;
@need_relocation{@need_relocation} = @need_relocation;

# This can have .../ anywhere:
if (fetch_string({}, 'otherlibdirs') =~ m!\.\.\./!) {
    $need_relocation{otherlibdirs} = 'otherlibdirs';
}

my $relocation_code = <<'EOT';

sub relocate_inc {
  my $libdir = shift;
  return $libdir unless $libdir =~ s!^\.\.\./!!;
  my $prefix = $^X;
  if ($prefix =~ s!/[^/]*$!!) {
    while ($libdir =~ m!^\.\./!) {
      # Loop while $libdir starts "../" and $prefix still has a trailing
      # directory
      last unless $prefix =~ s!/([^/]+)$!!;
      # but bail out if the directory we picked off the end of $prefix is .
      # or ..
      if ($1 eq '.' or $1 eq '..') {
	# Undo! This should be rare, hence code it this way rather than a
	# check each time before the s!!! above.
	$prefix = "$prefix/$1";
	last;
      }
      # Remove that leading ../ and loop again
      substr ($libdir, 0, 3, '');
    }
    $libdir = "$prefix/$libdir";
  }
  $libdir;
}
EOT

my $osname = fetch_string({}, 'osname');
my $from = $osname eq 'VMS' ? 'PERLSHR image' : 'binary (from libperl)';
my $env_cygwin = $osname eq 'cygwin'
    ? 'push @env, "CYGWIN=\"$ENV{CYGWIN}\"" if $ENV{CYGWIN};' . "\n" : "";

$heavy_txt .= sprintf <<'ENDOFBEG', $osname, $osname, $from, $osname, $env_cygwin;
# 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.

package Config;
use strict;
use warnings;
use vars '%%Config';

sub bincompat_options {
    return split ' ', (Internals::V())[0];
}

sub non_bincompat_options {
    return split ' ', (Internals::V())[1];
}

sub compile_date {
    return (Internals::V())[2]
}

sub local_patches {
    my (undef, undef, undef, @patches) = Internals::V();
    return @patches;
}

sub _V {
    die "Perl lib was built for '%s' but is being run on '$^O'"
        unless "%s" eq $^O;

    my ($bincompat, $non_bincompat, $date, @patches) = Internals::V();

    my $opts = join ' ', sort split ' ', "$bincompat $non_bincompat";

    # wrap at 76 columns.

    $opts =~ s/(?=.{53})(.{1,53}) /$1\n                        /mg;

    print Config::myconfig();
    print "\nCharacteristics of this %s: \n";

    print "  Compile-time options: $opts\n";

    if (@patches) {
        print "  Locally applied patches:\n";
        print "\t$_\n" foreach @patches;
    }

    print "  Built under %s\n";

    print "  $date\n" if defined $date;

    my @env = map { "$_=\"$ENV{$_}\"" } sort grep {/^PERL/} keys %%ENV;
%s
    if (@env) {
        print "  \%%ENV:\n";
        print "    $_\n" foreach @env;
    }
    print "  \@INC:\n";
    print "    $_\n" foreach @INC;
}

sub header_files {
ENDOFBEG

$heavy_txt .= $header_files . "\n}\n\n";

if (%need_relocation) {
  my $relocations_in_common;
  # otherlibdirs only features in the hash
  foreach (keys %need_relocation) {
    $relocations_in_common++ if $Common{$_};
  }
  if ($relocations_in_common) {
    $config_txt .= $relocation_code;
  } else {
    $heavy_txt .= $relocation_code;
  }
}

$heavy_txt .= join('', @non_v) . "\n";

# copy config summary format from the myconfig.SH script
$heavy_txt .= "our \$summary = <<'!END!';\n";
open(MYCONFIG,"<myconfig.SH") || die "open myconfig.SH failed: $!";
1 while defined($_ = <MYCONFIG>) && !/^Summary of/;
do { $heavy_txt .= $_ } until !defined($_ = <MYCONFIG>) || /^\s*$/;
close(MYCONFIG);

$heavy_txt .= "\n!END!\n" . <<'EOT';
my $summary_expanded;

sub myconfig {
    return $summary_expanded if $summary_expanded;
    ($summary_expanded = $summary) =~ s{\$(\w+)}
		 { 
			my $c;
			if ($1 eq 'git_ancestor_line') {
				if ($Config::Config{git_ancestor}) {
					$c= "\n  Ancestor: $Config::Config{git_ancestor}";
				} else {
					$c= "";
				}
			} else {
                     		$c = $Config::Config{$1}; 
			}
			defined($c) ? $c : 'undef' 
		}ge;
    $summary_expanded;
}

local *_ = \my $a;
$_ = <<'!END!';
EOT

$heavy_txt .= join('', sort @v_others) . "!END!\n";

# Only need the dynamic byteorder code in Config.pm if 'byteorder' is one of
# the precached keys
if ($Common{byteorder}) {
    $config_txt .= $byteorder_code;
} else {
    $heavy_txt .= $byteorder_code;
}

if (@need_relocation) {
$heavy_txt .= 'foreach my $what (qw(' . join (' ', @need_relocation) .
      ")) {\n" . <<'EOT';
    s/^($what=)(['"])(.*?)\2/$1 . $2 . relocate_inc($3) . $2/me;
}
EOT
# Currently it only makes sense to do the ... relocation on Unix, so there's
# no need to emulate the "which separator for this platform" logic in perl.c -
# ':' will always be applicable
if ($need_relocation{otherlibdirs}) {
$heavy_txt .= << 'EOT';
s{^(otherlibdirs=)(['"])(.*?)\2}
 {$1 . $2 . join ':', map {relocate_inc($_)} split ':', $3 . $2}me;
EOT
}
}

$heavy_txt .= <<'EOT';
s/(byteorder=)(['"]).*?\2/$1$2$Config::byteorder$2/m;

my $config_sh_len = length $_;

our $Config_SH_expanded = "\n$_" . << 'EOVIRTUAL';
EOT

foreach my $prefix (qw(ccflags ldflags)) {
    my $value = fetch_string ({}, $prefix);
    my $withlargefiles = fetch_string ({}, $prefix . "_uselargefiles");
    if (defined $withlargefiles) {
        $value =~ s/\Q$withlargefiles\E\b//;
        $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
    }
}

foreach my $prefix (qw(libs libswanted)) {
    my $value = fetch_string ({}, $prefix);
    my $withlf = fetch_string ({}, 'libswanted_uselargefiles');
    next unless defined $withlf;
    my @lflibswanted
       = split(' ', fetch_string ({}, 'libswanted_uselargefiles'));
    if (@lflibswanted) {
	my %lflibswanted;
	@lflibswanted{@lflibswanted} = ();
	if ($prefix eq 'libs') {
	    my @libs = grep { /^-l(.+)/ &&
                            not exists $lflibswanted{$1} }
		                    split(' ', fetch_string ({}, 'libs'));
	    $value = join(' ', @libs);
	} else {
	    my @libswanted = grep { not exists $lflibswanted{$_} }
	                          split(' ', fetch_string ({}, 'libswanted'));
	    $value = join(' ', @libswanted);
	}
    }
    $heavy_txt .= "${prefix}_nolargefiles='$value'\n";
}

if (open(my $fh, "cflags")) {
    my $ccwarnflags;
    my $ccstdflags;
    while (<$fh>) {
        if (/^warn="(.+)"$/) {
            $ccwarnflags = $1;
        } elsif (/^stdflags="(.+)"$/) {
            $ccstdflags = $1;
        }
    }
    if (defined $ccwarnflags) {
      $heavy_txt .= "ccwarnflags='$ccwarnflags'\n";
    }
    if (defined $ccstdflags) {
      $heavy_txt .= "ccstdflags='$ccstdflags'\n";
    }
}

$heavy_txt .= "EOVIRTUAL\n";

$heavy_txt .= <<'ENDOFGIT';
eval {
	# do not have hairy conniptions if this isnt available
	require 'Config_git.pl';
	$Config_SH_expanded .= $Config::Git_Data;
	1;
} or warn "Warning: failed to load Config_git.pl, something strange about this perl...\n";
ENDOFGIT

$heavy_txt .= $fetch_string;

$config_txt .= <<'ENDOFEND';

sub FETCH {
    my($self, $key) = @_;

    # check for cached value (which may be undef so we use exists not defined)
    return exists $self->{$key} ? $self->{$key} : $self->fetch_string($key);
}

ENDOFEND

$heavy_txt .= <<'ENDOFEND';

my $prevpos = 0;

sub FIRSTKEY {
    $prevpos = 0;
    substr($Config_SH_expanded, 1, index($Config_SH_expanded, '=') - 1 );
}

sub NEXTKEY {
ENDOFEND
if ($seen_quotes{'"'}) {
$heavy_txt .= <<'ENDOFEND';
    # Find out how the current key's quoted so we can skip to its end.
    my $quote = substr($Config_SH_expanded,
		       index($Config_SH_expanded, "=", $prevpos)+1, 1);
    my $pos = index($Config_SH_expanded, qq($quote\n), $prevpos) + 2;
ENDOFEND
} else {
    # Just ' quotes, so it's much easier.
$heavy_txt .= <<'ENDOFEND';
    my $pos = index($Config_SH_expanded, qq('\n), $prevpos) + 2;
ENDOFEND
}
$heavy_txt .= <<'ENDOFEND';
    my $len = index($Config_SH_expanded, "=", $pos) - $pos;
    $prevpos = $pos;
    $len > 0 ? substr($Config_SH_expanded, $pos, $len) : undef;
}

sub EXISTS {
    return 1 if exists($_[0]->{$_[1]});

    return(index($Config_SH_expanded, "\n$_[1]='") != -1
ENDOFEND
if ($seen_quotes{'"'}) {
$heavy_txt .= <<'ENDOFEND';
           or index($Config_SH_expanded, "\n$_[1]=\"") != -1
ENDOFEND
}
$heavy_txt .= <<'ENDOFEND';
          );
}

sub STORE  { die "\%Config::Config is read-only\n" }
*DELETE = *CLEAR = \*STORE; # Typeglob aliasing uses less space

sub config_sh {
    substr $Config_SH_expanded, 1, $config_sh_len;
}

sub config_re {
    my $re = shift;
    return map { chomp; $_ } grep eval{ /^(?:$re)=/ }, split /^/,
    $Config_SH_expanded;
}

sub config_vars {
    # implements -V:cfgvar option (see perlrun -V:)
    foreach (@_) {
	# find optional leading, trailing colons; and query-spec
	my ($notag,$qry,$lncont) = m/^(:)?(.*?)(:)?$/;	# flags fore and aft, 
	# map colon-flags to print decorations
	my $prfx = $notag ? '': "$qry=";		# tag-prefix for print
	my $lnend = $lncont ? ' ' : ";\n";		# line ending for print

	# all config-vars are by definition \w only, any \W means regex
	if ($qry =~ /\W/) {
	    my @matches = config_re($qry);
	    print map "$_$lnend", @matches ? @matches : "$qry: not found"		if !$notag;
	    print map { s/\w+=//; "$_$lnend" } @matches ? @matches : "$qry: not found"	if  $notag;
	} else {
	    my $v = (exists $Config::Config{$qry}) ? $Config::Config{$qry}
						   : 'UNKNOWN';
	    $v = 'undef' unless defined $v;
	    print "${prfx}'${v}'$lnend";
	}
    }
}

# Called by the real AUTOLOAD
sub launcher {
    undef &AUTOLOAD;
    goto \&$Config::AUTOLOAD;
}

1;
ENDOFEND

if ($^O eq 'os2') {
    $config_txt .= <<'ENDOFSET';
my %preconfig;
if ($OS2::is_aout) {
    my ($value, $v) = $Config_SH_expanded =~ m/^used_aout='(.*)'\s*$/m;
    for (split ' ', $value) {
        ($v) = $Config_SH_expanded =~ m/^aout_$_='(.*)'\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 = $1, last if /^PERL_DLL_BASE\s*=\s*(\S*)\s*$/;
	}
    }
    $config_txt .= <<ENDOFSET if $dll;
\$preconfig{dll_name} = '$dll';
ENDOFSET
} else {
    $config_txt .= <<'ENDOFSET';
sub TIEHASH {
    bless $_[1], $_[0];
}
ENDOFSET
}

foreach my $key (keys %Common) {
    my $value = fetch_string ({}, $key);
    # Is it safe on the LHS of => ?
    my $qkey = $key =~ /^[A-Za-z_][A-Za-z0-9_]*$/ ? $key : "'$key'";
    if (defined $value) {
	# Quote things for a '' string
	$value =~ s!\\!\\\\!g;
	$value =~ s!'!\\'!g;
	$value = "'$value'";
	if ($key eq 'otherlibdirs') {
	    $value = "join (':', map {relocate_inc(\$_)} split (':', $value))";
	} elsif ($need_relocation{$key}) {
	    $value = "relocate_inc($value)";
	}
    } else {
	$value = "undef";
    }
    $Common{$key} = "$qkey => $value";
}

if ($Common{byteorder}) {
    $Common{byteorder} = 'byteorder => $byteorder';
}
my $fast_config = join '', map { "    $_,\n" } sort values %Common;

# Sanity check needed to stop an infinite loop if Config_heavy.pl fails to
# define &launcher for some reason (eg it got truncated)
$config_txt .= sprintf <<'ENDOFTIE', $fast_config;

sub DESTROY { }

sub AUTOLOAD {
    require 'Config_heavy.pl';
    goto \&launcher unless $Config::AUTOLOAD =~ /launcher$/;
    die "&Config::AUTOLOAD failed on $Config::AUTOLOAD";
}

# tie returns the object, so the value returned to require will be true.
tie %%Config, 'Config', {
%s};
ENDOFTIE


open(CONFIG_POD, ">$Config_POD") or die "Can't open $Config_POD: $!";
print CONFIG_POD <<'ENDOFTAIL';
=head1 NAME

Config - access Perl configuration information

=head1 SYNOPSIS

    use Config;
    if ($Config{usethreads}) {
	print "has thread support\n"
    } 

    use Config qw(myconfig config_sh config_vars config_re);

    print myconfig();

    print config_sh();

    print config_re();

    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.

For a description of the variables, please have a look at the
Glossary file, as written in the Porting folder, or use the url:
http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/Glossary

=over 4

=item myconfig()

Returns a textual summary of the major perl configuration values.
See also C<-V> in L<perlrun/Command Switches>.

=item config_sh()

Returns the entire perl configuration information in the form of the
original config.sh shell variable assignment script.

=item config_re($regex)

Like config_sh() but returns, as a list, only the config entries who's
names match the $regex.

=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/Command Switches>.

=item bincompat_options()

Returns a list of C pre-processor options used when compiling this F<perl>
binary, which affect its binary compatibility with extensions.
C<bincompat_options()> and C<non_bincompat_options()> are shown together in
the output of C<perl -V> as I<Compile-time options>.

=item non_bincompat_options()

Returns a list of C pre-processor options used when compiling this F<perl>
binary, which do not affect binary compatibility with extensions.

=item compile_date()

Returns the compile date (as a string), equivalent to what is shown by
C<perl -V>

=item local_patches()

Returns a list of the names of locally applied patches, equivalent to what
is shown by C<perl -V>.

=item header_files()

Returns a list of the header files that should be used as dependencies for
XS code, for this version of Perl on this platform.

=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.

=cut

ENDOFTAIL

if ($Opts{glossary}) {
  open(GLOS, "<$Glossary") or die "Can't open $Glossary: $!";
}
my %seen = ();
my $text = 0;
$/ = '';
my $errors= 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_POD <<EOF if $text;
=back

=cut

EOF
      print CONFIG_POD <<EOF;
=head2 $c

=over 4

=cut

EOF
     $text = 1;
    }
  }
  elsif (!$text || !/\A\t/) {
    warn "Expected a Configure variable header",
      ($text ? " or another paragraph of description" : () ),
      ", instead we got:\n$_";
    $errors++;
  }
  s/n't/n\00t/g;		# leave can't, won't etc untouched
  s/^\t\s+(.*)/\n$1/gm;		# Indented lines ===> new paragraph
  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
     (?! read/ )		# Not read/write
     (?! etc\. )		# Not etc.
     (?! I/O )			# Not I/O
     (
	\$ ?			# Allow leading $
	[\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
}

if ($Opts{glossary}) {
    <GLOS>;				# Skip the "DO NOT EDIT"
    <GLOS>;				# Skip the preamble
  while (<GLOS>) {
    process;
    print CONFIG_POD;
  }
  if ($errors) {
    die "Errors encountered while processing $Glossary. ",
        "Header lines are expected to be of the form:\n",
        "NAME (CLASS):\n",
        "Maybe there is a malformed header?\n",
    ;
  }
}

print CONFIG_POD <<'ENDOFTAIL';

=back

=head1 GIT DATA

Information on the git commit from which the current perl binary was compiled
can be found in the variable C<$Config::Git_Data>.  The variable is a
structured string that looks something like this:

  git_commit_id='ea0c2dbd5f5ac6845ecc7ec6696415bf8e27bd52'
  git_describe='GitLive-blead-1076-gea0c2db'
  git_branch='smartmatch'
  git_uncommitted_changes=''
  git_commit_id_title='Commit id:'
  git_commit_date='2009-05-09 17:47:31 +0200'

Its format is not guaranteed not to change over time.

=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(GLOS) if $Opts{glossary};
close(CONFIG_POD);
print "written $Config_POD\n";

my $orig_config_txt = "";
my $orig_heavy_txt = "";
{
    local $/;
    my $fh;
    $orig_config_txt = <$fh> if open $fh, "<", $Config_PM;
    $orig_heavy_txt  = <$fh> if open $fh, "<", $Config_heavy;
}

if ($orig_config_txt ne $config_txt or $orig_heavy_txt ne $heavy_txt) {
    open CONFIG, ">", $Config_PM or die "Can't open $Config_PM: $!\n";
    open CONFIG_HEAVY, ">", $Config_heavy or die "Can't open $Config_heavy: $!\n";
    print CONFIG $config_txt;
    print CONFIG_HEAVY $heavy_txt;
    close(CONFIG_HEAVY);
    close(CONFIG);
    print "updated $Config_PM\n";
    print "updated $Config_heavy\n";
}

# Now do some simple tests on the Config.pm file we have created
unshift(@INC,'lib');
require $Config_PM;
require $Config_heavy;
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;
# Popularity of various entries in %Config, based on a large build and test
# run of code in the Fotango build system:
__DATA__
path_sep:	8490
d_readlink:	7101
d_symlink:	7101
archlibexp:	4318
sitearchexp:	4305
sitelibexp:	4305
privlibexp:	4163
ldlibpthname:	4041
libpth:	2134
archname:	1591
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osvers:	982
osname:	851
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intsize:	759
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so:	512
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ldflags:	495
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