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#!./miniperl
use strict;
use warnings;
use Config;
BEGIN {
    if ($^O eq 'MSWin32') {
unshift @INC, ('../cpan/Cwd', '../cpan/Cwd/lib');
require File::Spec::Functions;
require FindExt;
    }
    else {
unshift @INC, 'cpan/Cwd';
    }
}
use Cwd;

my $is_Win32 = $^O eq 'MSWin32';
my $is_VMS = $^O eq 'VMS';
my $is_Unix = !$is_Win32 && !$is_VMS;

# To clarify, this isn't the entire suite of modules considered "toolchain"
# It's not even all modules needed to build ext/
# It's just the source paths of the (minimum complete set of) modules in ext/
# needed to build the nonxs modules
# After which, all nonxs modules are in lib, which was always sufficient to
# allow miniperl to build everything else.

# This list cannot get any longer without overflowing the length limit for
# environment variables on VMS
my @toolchain = qw(cpan/AutoLoader/lib
cpan/Cwd cpan/Cwd/lib
cpan/ExtUtils-Command/lib
dist/ExtUtils-Install/lib
cpan/ExtUtils-MakeMaker/lib
cpan/ExtUtils-Manifest/lib
cpan/File-Path/lib
);

# Used only in ExtUtils::Liblist::Kid::_win32_ext()
push @toolchain, 'cpan/Text-ParseWords/lib' if $is_Win32;

my @ext_dirs = qw(cpan dist ext);
my $ext_dirs_re = '(?:' . join('|', @ext_dirs) . ')';

# This script acts as a simple interface for building extensions.

# It's actually a cut and shut of the Unix version ext/utils/makeext and the
# Windows version win32/build_ext.pl hence the two invocation styles.

# On Unix, it primarily used by the perl Makefile one extention at a time:
#
# d_dummy $(dynamic_ext): miniperl preplibrary FORCE
# @$(RUN) ./miniperl make_ext.pl --target=dynamic $@ MAKE=$(MAKE) LIBPERL_A=$(LIBPERL)
#
# On Windows or VMS,
# If '--static' is specified, static extensions will be built.
# If '--dynamic' is specified, dynamic extensions will be built.
# If '--nonxs' is specified, nonxs extensions will be built.
# If '--dynaloader' is specificied, DynaLoader will be built.
# If '--all' is specified, all extensions will be built.
#
# make_ext.pl "MAKE=make [-make_opts]" --dir=directory [--target=target] [--static|--dynamic|--all] +ext2 !ext1
#
# E.g.
#
# make_ext.pl "MAKE=nmake -nologo" --dir=..\ext
#
# make_ext.pl "MAKE=nmake -nologo" --dir=..\ext --target=clean
#
# make_ext.pl MAKE=dmake --dir=..\ext
#
# make_ext.pl MAKE=dmake --dir=..\ext --target=clean
#
# Will skip building extensions which are marked with an '!' char.
# Mostly because they still not ported to specified platform.
#
# If any extensions are listed with a '+' char then only those
# extensions will be built, but only if they arent countermanded
# by an '!ext' and are appropriate to the type of building being done.

# It may be deleted in a later release of perl so try to
# avoid using it for other purposes.

my (%excl, %incl, %opts, @extspec, @pass_through);

foreach (@ARGV) {
    if (/^!(.*)$/) {
$excl{$1} = 1;
    } elsif (/^\+(.*)$/) {
$incl{$1} = 1;
    } elsif (/^--([\w\-]+)$/) {
$opts{$1} = 1;
    } elsif (/^--([\w\-]+)=(.*)$/) {
push @{$opts{$1}}, $2;
    } elsif (/=/) {
push @pass_through, $_;
    } elsif (length) {
push @extspec, $_;
    }
}

my $static = $opts{static} || $opts{all};
my $dynamic = $opts{dynamic} || $opts{all};
my $nonxs = $opts{nonxs} || $opts{all};
my $dynaloader = $opts{dynaloader} || $opts{all};

# The Perl Makefile.SH will expand all extensions to
# lib/auto/X/X.a (or lib/auto/X/Y/Y.a if nested)
# A user wishing to run make_ext might use
# X (or X/Y or X::Y if nested)

# canonise into X/Y form (pname)

foreach (@extspec) {
    if (s{^lib/auto/}{}) {
# Remove lib/auto prefix and /*.* suffix
s{/[^/]+\.[^/]+$}{};
    } elsif (s{^$ext_dirs_re/}{}) {
# Remove ext/ prefix and /pm_to_blib suffix
s{/pm_to_blib$}{};
# Targets are given as files on disk, but the extension spec is still
# written using /s for each ::
tr!-!/!;
    } elsif (s{::}{\/}g) {
# Convert :: to /
    } else {
s/\..*o//;
    }
}

my $makecmd = shift @pass_through; # Should be something like MAKE=make
unshift @pass_through, 'PERL_CORE=1';

my @dirs = @{$opts{dir} || \@ext_dirs};
my $target = $opts{target}[0];
$target = 'all' unless defined $target;

# Previously, $make was taken from config.sh. However, the user might
# instead be running a possibly incompatible make. This might happen if
# the user types "gmake" instead of a plain "make", for example. The
# correct current value of MAKE will come through from the main perl
# makefile as MAKE=/whatever/make in $makecmd. We'll be cautious in
# case third party users of this script (are there any?) don't have the
# MAKE=$(MAKE) argument, which was added after 5.004_03.
unless(defined $makecmd and $makecmd =~ /^MAKE=(.*)$/) {
    die "$0: WARNING: Please include MAKE=\$(MAKE) in \@ARGV\n";
}

# This isn't going to cope with anything fancy, such as spaces inside command
# names, but neither did what it replaced. Once there is a use case that needs
# it, please supply patches. Until then, I'm sticking to KISS
my @make = split ' ', $1 || $Config{make} || $ENV{MAKE};
# Using an array of 0 or 1 elements makes the subsequent code simpler.
my @run = $Config{run};
@run = () if not defined $run[0] or $run[0] eq '';


if ($target eq '') {
    die "make_ext: no make target specified (eg all or clean)\n";
} elsif ($target !~ /(?:^all|clean)$/) {
    # for the time being we are strict about what make_ext is used for
    die "$0: unknown make target '$target'\n";
}

if (!@extspec and !$static and !$dynamic and !$nonxs and !$dynaloader) {
    die "$0: no extension specified\n";
}

my $perl;
my %extra_passthrough;

if ($is_Win32) {
    (my $here = getcwd()) =~ s{/}{\\}g;
    $perl = $^X;
    if ($perl =~ m#^\.\.#) {
$perl = "$here\\$perl";
    }
    (my $topdir = $perl) =~ s/\\[^\\]+$//;
    # miniperl needs to find perlglob and pl2bat
    $ENV{PATH} = "$topdir;$topdir\\win32\\bin;$ENV{PATH}";
    my $pl2bat = "$topdir\\win32\\bin\\pl2bat";
    unless (-f "$pl2bat.bat") {
my @args = ($perl, "-I$topdir\\lib", ("$pl2bat.pl") x 2);
print "@args\n";
system(@args) unless defined $::Cross::platform;
    }

    my $build = getcwd();
    print "In $build";
    foreach my $dir (@dirs) {
chdir($dir) or die "Cannot cd to $dir: $!\n";
(my $ext = getcwd()) =~ s{/}{\\}g;
FindExt::scan_ext($ext);
FindExt::set_static_extensions(split ' ', $Config{static_ext});
chdir $build
or die "Couldn't chdir to '$build': $!"; # restore our start directory
    }

    my @ext;
    push @ext, FindExt::static_ext() if $static;
    push @ext, FindExt::dynamic_ext() if $dynamic;
    push @ext, FindExt::nonxs_ext() if $nonxs;
    push @ext, 'DynaLoader' if $dynaloader;

    foreach (sort @ext) {
if (%incl and !exists $incl{$_}) {
#warn "Skipping extension $_, not in inclusion list\n";
next;
}
if (exists $excl{$_}) {
warn "Skipping extension $_, not ported to current platform";
next;
}
push @extspec, $_;
if($_ eq 'DynaLoader' and $target !~ /clean$/) {
# No, we don't know why nmake can't work out the dependency chain
push @{$extra_passthrough{$_}}, 'DynaLoader.c';
} elsif(FindExt::is_static($_)) {
push @{$extra_passthrough{$_}}, 'LINKTYPE=static';
}
    }

    chdir '..'
or die "Couldn't chdir to build directory: $!"; # now in the Perl build
}
elsif ($is_VMS) {
    $perl = $^X;
    push @extspec, (split ' ', $Config{static_ext}) if $static;
    push @extspec, (split ' ', $Config{dynamic_ext}) if $dynamic;
    push @extspec, (split ' ', $Config{nonxs_ext}) if $nonxs;
    push @extspec, 'DynaLoader' if $dynaloader;
}

{
    # Cwd needs to be built before Encode recurses into subdirectories.
    # This seems to be the simplest way to ensure this ordering:
    my (@first, @other);
    foreach (@extspec) {
if ($_ eq 'Cwd') {
push @first, $_;
} else {
push @other, $_;
}
    }
    @extspec = (@first, @other);
}

if ($Config{osname} eq 'catamount' and @extspec) {
    # Snowball's chance of building extensions.
    die "This is $Config{osname}, not building $extspec[0], sorry.\n";
}

foreach my $spec (@extspec) {
    my $mname = $spec;
    $mname =~ s!/!::!g;
    my $ext_pathname;

    # Try new style ext/Data-Dumper/ first
    my $copy = $spec;
    $copy =~ tr!/!-!;
    foreach my $dir (@ext_dirs) {
if (-d "$dir/$copy") {
$ext_pathname = "$dir/$copy";
last;
}
    }

    if (!defined $ext_pathname) {
if (-d "ext/$spec") {
# Old style ext/Data/Dumper/
$ext_pathname = "ext/$spec";
} else {
warn "Can't find extension $spec in any of @ext_dirs";
next;
}
    }

    print "\tMaking $mname ($target)\n";

    build_extension($ext_pathname, $perl, $mname,
[@pass_through, @{$extra_passthrough{$spec} || []}]);
}

sub build_extension {
    my ($ext_dir, $perl, $mname, $pass_through) = @_;

    unless (chdir "$ext_dir") {
warn "Cannot cd to $ext_dir: $!";
return;
    }

    my $up = $ext_dir;
    $up =~ s![^/]+!..!g;

    $perl ||= "$up/miniperl";
    my $return_dir = $up;
    my $lib_dir = "$up/lib";
    # $lib_dir must be last, as we're copying files into it, and in a parallel
    # make there's a race condition if one process tries to open a module that
    # another process has half-written.
    my @new_inc = ((map {"$up/$_"} @toolchain), $lib_dir);
    if ($is_Win32) {
@new_inc = map {File::Spec::Functions::rel2abs($_)} @new_inc;
    }
    $ENV{PERL5LIB} = join $Config{path_sep}, @new_inc;
    $ENV{PERL_CORE} = 1;
    # warn $ENV{PERL5LIB};

    my $makefile;
    if ($is_VMS) {
$makefile = 'descrip.mms';
if ($target =~ /clean$/
&& !-f $makefile
&& -f "${makefile}_old") {
$makefile = "${makefile}_old";
}
    } else {
$makefile = 'Makefile';
    }
    
    if (!-f $makefile) {
if (!-f 'Makefile.PL') {
print "\nCreating Makefile.PL in $ext_dir for $mname\n";
# We need to cope well with various possible layouts
my @dirs = split /::/, $mname;
my $leaf = pop @dirs;
my $leafname = "$leaf.pm";
my $pathname = join '/', @dirs, $leafname;
my @locations = ($leafname, $pathname, "lib/$pathname");
my $fromname;
foreach (@locations) {
if (-f $_) {
$fromname = $_;
last;
}
}

unless ($fromname) {
die "For $mname tried @locations in in $ext_dir but can't find source";
}
            my $pod_name;
($pod_name = $fromname) =~ s/\.pm\z/.pod/;
$pod_name = $fromname unless -e $pod_name;
open my $fh, '>', 'Makefile.PL'
or die "Can't open Makefile.PL for writing: $!";
print $fh <<"EOM";
#-*- buffer-read-only: t -*-

# This Makefile.PL was written by $0.
# It will be deleted automatically by make realclean

use strict;
use ExtUtils::MakeMaker;

WriteMakefile(
NAME => '$mname',
VERSION_FROM => '$fromname',
ABSTRACT_FROM => '$pod_name',
realclean => {FILES => 'Makefile.PL'},
);

# ex: set ro:
EOM
close $fh or die "Can't close Makefile.PL: $!";
}
print "\nRunning Makefile.PL in $ext_dir\n";

# Presumably this can be simplified
my @cross;
if (defined $::Cross::platform) {
# Inherited from win32/buildext.pl
@cross = "-MCross=$::Cross::platform";
} elsif ($opts{cross}) {
# Inherited from make_ext.pl
@cross = '-MCross';
}

my @args = (@cross, 'Makefile.PL');
if ($is_VMS) {
my $libd = VMS::Filespec::vmspath($lib_dir);
push @args, "INST_LIB=$libd", "INST_ARCHLIB=$libd";
} else {
push @args, 'INSTALLDIRS=perl', 'INSTALLMAN1DIR=none',
'INSTALLMAN3DIR=none';
}
push @args, @$pass_through;
_quote_args(\@args) if $is_VMS;
print join(' ', @run, $perl, @args), "\n";
my $code = system @run, $perl, @args;
warn "$code from $ext_dir\'s Makefile.PL" if $code;

# Right. The reason for this little hack is that we're sitting inside
# a program run by ./miniperl, but there are tasks we need to perform
# when the 'realclean', 'distclean' or 'veryclean' targets are run.
# Unfortunately, they can be run *after* 'clean', which deletes
# ./miniperl
# So we do our best to leave a set of instructions identical to what
# we would do if we are run directly as 'realclean' etc
# Whilst we're perfect, unfortunately the targets we call are not, as
# some of them rely on a $(PERL) for their own distclean targets.
# But this always used to be a problem with the old /bin/sh version of
# this.
if ($is_Unix) {
my $suffix = '.sh';
foreach my $clean_target ('realclean', 'veryclean') {
my $file = "$return_dir/$clean_target$suffix";
open my $fh, '>>', $file or die "open $file: $!";
# Quite possible that we're being run in parallel here.
# Can't use Fcntl this early to get the LOCK_EX
flock $fh, 2 or warn "flock $file: $!";
print $fh <<"EOS";
cd $ext_dir
if test ! -f Makefile -a -f Makefile.old; then
echo "Note: Using Makefile.old"
make -f Makefile.old $clean_target MAKE='@make' @pass_through
else
if test ! -f Makefile ; then
echo "Warning: No Makefile!"
fi
make $clean_target MAKE='@make' @pass_through
fi
cd $return_dir
EOS
close $fh or die "close $file: $!";
}
}
    }

    if (not -f $makefile) {
print "Warning: No Makefile!\n";
    }

    if ($is_VMS) {
_macroify_passthrough($pass_through);
unshift @$pass_through, "/DESCRIPTION=$makefile";
    }

    if (!$target or $target !~ /clean$/) {
# Give makefile an opportunity to rewrite itself.
# reassure users that life goes on...
my @args = ('config', @$pass_through);
_quote_args(\@args) if $is_VMS;
system(@run, @make, @args) and print "@run @make @args failed, continuing anyway...\n";
    }
    my @targ = ($target, @$pass_through);
    _quote_args(\@targ) if $is_VMS;
    print "Making $target in $ext_dir\n@run @make @targ\n";
    my $code = system(@run, @make, @targ);
    die "Unsuccessful make($ext_dir): code=$code" if $code != 0;

    chdir $return_dir || die "Cannot cd to $return_dir: $!";
}

sub _quote_args {
    my $args = shift; # must be array reference

    # Do not quote qualifiers that begin with '/'.
    map { if (!/^\//) {
          $_ =~ s/\"/""/g; # escape C<"> by doubling
          $_ = q(").$_.q(");
        }
    } @{$args}
    ;
}

sub _macroify_passthrough {
    my $passthrough = shift;
    _quote_args($passthrough);
    my $macro = '/MACRO=(' . join(',',@$passthrough) . ')';
    @$passthrough = ();
    @$passthrough[0] = $macro;
}
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