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Editing: perlcc

#!/usr/local/cpanel/3rdparty/perl/542/bin/perl
    eval 'exec /usr/local/cpanel/3rdparty/perl/542/bin/perl -S $0 ${1+"$@"}'
    if $running_under_some_shell;
--$running_under_some_shell;
# Version 2.0, Simon Cozens, Thu Mar 30 17:52:45 JST 2000
# Version 2.01, Tom Christiansen, Thu Mar 30 08:25:14 MST 2000
# Version 2.02, Simon Cozens, Sun Apr 16 01:53:36 JST 2000
# Version 2.03, Edward Peschko, Mon Feb 26 12:04:17 PST 2001
# Version 2.04, Enache Adrian, Fri, 18 Jul 2003 23:15:37 +0300
# Version 2.05, Reini Urban, 2009-12-01 00:00:13
# Version 2.06, Reini Urban, 2009-12-28 21:56:15
# Version 2.07, Reini Urban, 2010-06-30 22:32:20
# Version 2.08, Reini Urban, 2010-07-30 21:30:33
# Version 2.09, Reini Urban, 2010-10-11 13:54:52
# Version 2.10, Reini Urban, 2011-02-11 22:58:37
# Version 2.11, Reini Urban, 2011-04-11 20:16:00
# Version 2.12, Reini Urban, 2011-10-02 05:19:00
# Version 2.13, Reini Urban, 2012-01-10 13:03:00
# Version 2.14, Reini Urban, 2012-02-28 09:04:07
# Version 2.15, Reini Urban, 2013-02-01 10:41:54
# Version 2.16, Reini Urban, 2013-11-27 11:36:13
# Version 2.17, Reini Urban, Thu Feb 6 14:04:29 2014 -0600
# Version 2.18, Reini Urban, 2014-05-28
# Version 2.19, Reini Urban, 2014-07-09
# Version 2.20, Reini Urban, 2014-07-23

use strict;
use warnings;
use 5.006_000;

use FileHandle;
use Config;
use Fcntl qw(:DEFAULT :flock);
use File::Temp qw(tempfile);
use File::Basename qw(basename dirname);

# use Cwd;
use Pod::Usage;

use constant MINIMUM_VERBOSE_LEVEL => 1;

# Time::HiRes does not work with 5.6
# use Time::HiRes qw(gettimeofday tv_interval);
our $VERSION = 2.20;
$| = 1;
eval { require B::C::Flags; };

$SIG{INT} = sub { exit(); }
  if exists $SIG{INT};    # exit gracefully and clean up after ourselves.

use subs qw{
  cc_harness check_read check_write checkopts_byte choose_backend
  compile_byte compile_cstyle compile_module generate_code
  grab_stash parse_argv sanity_check vprint yclept spawnit
  gettimeofday tv_interval vsystem
};
sub opt(*);               # imal quoting

our ( $Options, $BinPerl, $Backend );
our ( $Input => $Output );
our ($logfh);
our ($cfile);
our (@begin_output);      # output from BEGIN {}, for testsuite
our ($extra_libs);

# eval { main(); 1 } or die;

main();

sub main {
    parse_argv();
    check_write($Output);
    choose_backend();
    generate_code();
    run_code();
    _die("Not reached?");
}

#######################################################################

sub choose_backend {

# Choose the backend.
    $Backend = 'C';
    if ( opt('B') ) {
        checkopts_byte();
        $Backend = 'Bytecode';
    }
    if ( opt('S') && opt('c') ) {

# die "$0: Do you want me to compile this or not?\n";
        delete $Options->{S};
    }
    $Backend = 'CC' if opt('O');
}

sub generate_code {

vprint 4, "Compiling $Input";

$BinPerl = yclept();    # Calling convention for perl.

if ( exists $Options->{m} ) {
        compile_module();
    }
    else {
        if ( $Backend eq 'Bytecode' ) {
            compile_byte();
        }
        else {
            compile_cstyle();
        }
    }
    exit(0) if ( !opt('r') );
}

sub run_code {
    if ( $Backend eq 'Bytecode' ) {
        if ( $] < 5.007 ) {
            $Output = "$BinPerl -MByteLoader $Output";
        }
        else {
            $Output = "$BinPerl $Output";
        }
    }
    if ($extra_libs) {
        my $path    = '';
        my $PATHSEP = ':';
        for ( split / /, $extra_libs ) {
            s{/[^/]+$}{};

# XXX qx quote?
            $path .= $PATHSEP . $_ if $_;
        }
        if ( $^O ne 'darwin' ) {
            $ENV{LD_LIBRARY_PATH} .= $path;
            vprint 0, "LD_LIBRARY_PATH=\$LD_LIBRARY_PATH$path";
        }
    }
    vprint 0, "Running code $Output @ARGV";
    system( join( " ", $Output, @ARGV ) );
    exit(0);
}

# usage: vprint [level] msg args
sub vprint {
    my $level;
    if ( @_ == 1 ) {
        $level = 1;
    }
    elsif ( $_[0] =~ /^-?\d$/ ) {
        $level = shift;
    }
    else {
        # well, they forgot to use a number; means >0
        $level = 0;
    }
    my $msg = "@_";
    $msg .= "\n" unless substr( $msg, -1 ) eq "\n";
    if ( opt('v') > $level ) {
        if ( opt('log') ) {
            print $logfh "$0: $msg";
        }
        else {
            print "$0: $msg";
        }
    }
}

sub vsystem {
    if ( opt('dryrun') ) {
        print "@_\n";
    }
    else {
        system(@_);
    }
}

sub parse_argv {

use Getopt::Long;

# disallows using long arguments
    Getopt::Long::Configure("bundling");
    Getopt::Long::Configure("no_ignore_case");

# no difference in exists and defined for %ENV; also, a "0"
    # argument or a "" would not help cc, so skip
    unshift @ARGV, split ' ', $ENV{PERLCC_OPTS} if $ENV{PERLCC_OPTS};

$Options = {};

# support single dash -Wb. GetOptions requires --Wb with bundling enabled.
    if ( my ($wb) = grep /^-Wb=.+/, @ARGV ) {
        $Options->{Wb} = $Options->{Wb} ? $Options->{Wb} . "," . substr( $wb, 4 ) : substr( $wb, 4 );
        @ARGV = grep !/^-Wb=(.+)/, @ARGV;
    }

# -O2 i.e. -Wb=-O1 (new since 2.13)
    if ( my ($o1) = grep /^-O(\d)$/, @ARGV ) {
        $Options->{Wb} = $Options->{Wb} ? $Options->{Wb} . ",$o1" : $o1;
        @ARGV = grep !/^-O\d$/, @ARGV;
    }
    if ( my ($v) = grep /^-v\d?$/a, @ARGV ) {
        $v =~ s{^-v}{};
        $v = 1 unless length $v;
        $Options->{v} = 0 + $v;
        @ARGV = grep !/^-v\d?$/a, @ARGV;
    }
    if ( grep /^-stash$/, @ARGV ) {
        $Options->{stash}++;
        @ARGV = grep !/^-stash$/, @ARGV;
    }
    $Options->{spawn} = 1;
    Getopt::Long::GetOptions(
        $Options,
        'L=s',              # lib directory
        'I=s',              # include directories (FOR C, NOT FOR PERL)
        'o=s',              # Output executable
        'v:i',              # Verbosity level
        'e=s',              # One-liner
        'm|sharedlib:s',    # as Module [name] (new since 2.11, not yet tested)
        'r',                # run resulting executable
        'B',                # Byte compiler backend
        'O',                # Optimised C backend B::CC
                            #'O1-4'        # alias for -Wb=-O1 (new since 2.13)
        'dryrun|n',         # only print commands, do not execute
        'c',                # Compile to C only, no linking
        'check',            # pass -c to B::C and exit
        'g',                # -g option for gcc
        'help|h',           # Help me
        'S',                # Keep generated C file
        'T',                # run the backend using perl -T
        't',                # run the backend using perl -t
        'u=s@',             # use packages (new since 2.13)
        'U=s@',             # skip packages (new since 2.13)
        'static',           # Link to static libperl (default, new since 2.11)
        'shared',           # Link to shared libperl (new since 2.07)
        'sharedxs',         # Link shared XSUBs (default, new since 2.07))
        'stash',            # Detect external packages via B::Stash
        'log:s',            # where to log compilation process information
        'Wb=s',             # pass (comma-seperated) options to backend
        'f=s@',             # pass compiler option(s) to backend (new since 2.14)
        'Wc=s',             # pass (comma-seperated) options to cc (new since 2.13)
        'Wl=s',             # pass (comma-seperated) options to ld (new since 2.13)
        'spawn!',           # --no-spawn (new since 2.12)
        'time',             # print benchmark timings (new since 2.08)
        'version',          # (new since 2.13)
        'D|d',              # short option do not allow extra args
        'debug=s',          # alias for --Wb=-Dfull and -S to enable all debug and preserve source code
    );
    $Options->{debug} = '' if $Options->{D}; # when short option is used
    if ( defined $Options->{debug} ) {
        $Options->{debug} =~ s{^=+}{};
        $Options->{debug} = 'full' if !length $Options->{debug} && !$Options->{D};
        $Options->{debug} =~ s{,}{.}g;    # comma is already used
        $Options->{Wb} = $Options->{Wb} ? $Options->{Wb} . ',' : '';
        $Options->{Wb} .= '-D' . $Options->{debug};
        $Options->{S} = 1;
    }

if ( $Options->{'g'} || defined $ENV{BC_CFLAGS} && $ENV{BC_CFLAGS} =~ qr{^-?g$} ) {
        vprint 3, q{Using gcc '-g' compilation option.};
        $Options->{'g'} = 1;
    }

$Options->{v} += 0;

if ( opt('t') && opt('T') ) {
        warn "Can't specify both -T and -t, -t ignored";
        $Options->{t} = 0;
    }

helpme() if opt('help');    # And exit
    if ( opt('version') ) {
        die version();
    }

# $Options->{Wb} .= ",-O1" if opt('O1');
    # $Options->{Wb} .= ",-O2" if opt('O2');
    # $Options->{Wb} .= ",-O3" if opt('O3');
    # $Options->{Wb} .= ",-O4" if opt('O4');

if ( $Options->{time} or $Options->{spawn} ) {
        eval { require Time::HiRes; };    # 5.6 has no Time::HiRes
        if ($@) {
            warn "--time ignored. No Time::HiRes\n" if $Options->{time};
            $Options->{time} = 0;
        }
        else {
            *gettimeofday = *Time::HiRes::gettimeofday;
            Time::HiRes::gettimeofday();
            Time::HiRes->import( 'gettimeofday', 'tv_interval', 'sleep' );
        }
    }
    $logfh = new FileHandle( ">> " . opt('log') ) if ( opt('log') );

if ( opt('e') ) {
        warn "$0: using -e 'code' as input file, ignoring @ARGV\n" if @ARGV;

# We don't use a temporary file here; why bother?
        # XXX: this is not bullet proof -- spaces or quotes in name!
        $Input = "-e '" . opt('e') . "'";
    }
    else {
        $Input = shift @ARGV;    # XXX: more files?
        _usage_and_die("No input file specified\n") unless $Input;

# DWIM modules. This is bad but necessary.
        $Options->{m} = '' if $Input =~ /\.pm\z/ and !opt('m');
        vprint 1, "$0: using $Input as input file, ignoring @ARGV\n" if @ARGV;
        check_read($Input);
        check_perl($Input);
    }

if ( opt('o') ) {
        $Output = opt('o');
    }
    elsif ( opt('B') ) {
        if ( opt('e') ) {
            my $suffix = '.plc';
            $suffix = '.pmc' if exists $Options->{m};
            ( undef, $Output ) = tempfile( "plcXXXXX", SUFFIX => $suffix );
        }
        else {
            $Output = basename($Input) . "c";
        }
    }
    else {
        $Output = opt('e') ? 'a.out' : $Input;
        $Output =~ s/\.(p[lm]|t)$//;
    }
    $Output = relativize($Output);
    sanity_check();
}

sub opt(*) {
    my $opt = shift;
    return exists( $Options->{$opt} ) && ( $Options->{$opt} || 0 );
}

sub compile_module {
    if ( $Backend eq 'Bytecode' ) {
        compile_byte( '-m' . $Options->{m} );
    }
    else {
        compile_cstyle( "-m" . $Options->{m} );
    }
}

sub compile_byte {

vprint 3, "Writing B on $Output";
    my $opts = $] < 5.007 ? "" : "-H,-s,";
    if ( $] >= 5.007 and $Input =~ /^-e/ ) {
        $opts = "-H,";
    }
    if ( @_ == 1 ) {
        $opts .= $_[0] . ",";
    }
    my $addoptions = opt('Wb');
    if ($addoptions) {
        $opts .= '-v,'                    if opt('v') > 4;
        $opts .= '-DM,-DG,-DA,-DComment,' if opt('v') > 5;
        $opts .= "$addoptions,";
    }
    elsif ( opt('v') > 4 ) {
        $opts .= '-v,';
        $opts .= '-DM,-DG,-DA,-DComment,' if opt('v') > 5;
    }
    my $command = "$BinPerl -MO=Bytecode,$opts-o$Output $Input";
    $Input =~ s/^-e.*$/-e/;
    vprint 5, "Compiling...";
    $command =~ s/\s\s+|\t/ /g;
    vprint 0, "Calling $command";

my $t0 = [gettimeofday] if opt('time');
    my ( $output_r, $error_r, $errcode ) = spawnit($command);
    my $elapsed = tv_interval($t0) if opt('time');
    vprint -1, "c time: $elapsed" if opt('time');

if ( @$error_r && $errcode != 0 ) {
        _die("$Input did not compile $errcode:\n@$error_r\n");
    }
    else {
        my @error = grep { !/^$Input syntax OK$/o } @$error_r;
        @error = grep { !/^No package specified for compilation, assuming main::$/o } @error;
        warn "$0: Unexpected compiler output\n@error" if @error and opt('v') < MINIMUM_VERBOSE_LEVEL();
        warn "@error\n" if @error and opt('v') >= MINIMUM_VERBOSE_LEVEL();
    }

unless ( opt('dryrun') ) {
        chmod 0777 & ~umask, $Output or _die("can't chmod $Output: $!\n");
    }
}

sub compile_cstyle {

adjust_options_for_B_dependency( $Input, $Options );    # these are global variables...

my $stash = opt('stash') ? grab_stash() : "";
    $stash .= "," if $stash;                                #stash can be empty
    $stash .= "-u$_," for @{ $Options->{u} };
    $stash .= "-U$_," for @{ $Options->{U} };

my $taint = opt('T') ? ' -T' : opt('t') ? ' -t' : '';

# What are we going to call our output C file?
    my $lose = 0;
    my ($cfh);
    my $addoptions = '';
    if ( @_ == 1 ) {
        $addoptions .= $_[0] . ",";
    }
    $addoptions .= opt('Wb');
    $addoptions .= ',' if length $addoptions && substr( $addoptions, -1, 1 ) ne ',';
    if ( opt('v') >= 1 && opt('v') <= 4 ) {
        $addoptions .= '-v';
    }
    elsif ( opt('v') == 5 ) {
        $addoptions .= '-Dsp,-v';
    }
    elsif ( opt('v') >= 6 ) {
        $addoptions .= '-Dfull';
    }
    $addoptions .= ',' if length $addoptions && substr( $addoptions, -1, 1 ) ne ',';

if ( opt('f') ) {
        $addoptions .= "-f$_," for @{ $Options->{f} };
    }
    if ( opt('check') ) {
        $addoptions .= "-c,";
    }

warn "Warning: staticxs on darwin is very experimental\n"
      if $^O eq 'darwin';
    if ( opt('check') ) {
        $cfile = "";
    }
    elsif ( opt('o') ) {
        $cfile = opt('o') . ".c";
    }
    elsif ( opt('S') || opt('c') ) {    # We need to keep it
        if ( opt('e') ) {
            $cfile = $Output;
            $cfile .= '.c';
        }
        else {
            $cfile = basename($Input);

# File off extension if present
            # hold on: plx is executable; also, careful of ordering!
            $cfile =~ s/\.(?:p(?:lx|l|h)|m)\z//i;
            $cfile .= ".c";
            $cfile = $Output if opt('c') && $Output =~ /\.c\z/i;
        }
        check_write($cfile);
    }
    else {    # Do not keep tempfiles (no -S nor -c nor -o)
        $lose = 1;
        ( $cfh, $cfile ) = tempfile( "pccXXXXX", SUFFIX => ".c" );
        close $cfh;    # See comment just below
    }
    vprint 3, "Writing C on $cfile" unless opt('check');
    foreach my $toclean ( $cfile, $cfile . ".lst" ) {
        unlink($toclean) if -e $toclean;
    }

my $max_line_len = '';
    my $options      = "$addoptions$max_line_len$stash";
    $options .= "-o$cfile" unless opt('check');
    $options = substr( $options, 0, -1 ) if substr( $options, -1, 1 ) eq ",";

# This has to do the write itself, so we can't keep a lock. Life
    # sucks.

my $command = "$BinPerl$taint -MO=$Backend,$options $Input";
    vprint 5, "Compiling...";
    $command =~ s/\s\s+|\t/ /g;
    vprint 0, "Calling $command";

my $t0 = [gettimeofday] if opt('time');
    my ( $output_r, $error_r, $errcode ) = spawnit($command);
    my $elapsed = tv_interval($t0) if opt('time');
    my @output  = @$output_r;
    my @error   = @$error_r;

if ( $errcode != 0 ) {
        _die("$Input did not compile, which can't happen $errcode:\n@error\n");
    }
    else {
        my $i = substr( $Input, 0, 2 ) eq '-e' ? '-e' : $Input;
        @error = grep { !/^$i syntax OK$/o } @error;
        if ( opt('check') ) {
            print "@error" if @error;
        }
        else {
            warn "$0: Unexpected compiler output\n@error" if @error and opt('v') < MINIMUM_VERBOSE_LEVEL;
            warn "@error\n" if @error and opt('v') >= MINIMUM_VERBOSE_LEVEL;
        }
    }
    _die(qq[Failed to generate .c file '$cfile'\n]) unless -e $cfile && -s $cfile;
    vprint -1, "c time: $elapsed" if opt('time');
    $extra_libs = '';
    my %rpath;
    if ( open( XS, "<", $cfile . ".lst" ) ) {
        while (<XS>) {
            my ( $s, $l ) = m/^([^\t]+)(.*)$/;
            next if grep { $s eq $_ } @{ $Options->{U} };
            $stash .= ",-u$s";
            if ($l) {
                $l = substr( $l, 1 );
                if ( $^O eq 'darwin' and $l =~ /\.bundle$/ ) {
                    my $ofile = $l;
                    $ofile =~ s/\.bundle$/.o/;
                    $ofile =~ s{^.*/auto/}{};
                    $ofile =~ s{(.*)/[^/]+\.o}{$1.o};
                    $ofile =~ s{/}{_}g;
                    $ofile = 'pcc' . $ofile;
                    if ( -e $ofile ) {
                        vprint 3, "Using " . $ofile;
                    }
                    else {
                        vprint 3, "Creating " . $ofile;

# This fails sometimes
                        my $cmd = "otool -tv $l | \"$^X\" -pe " . q{'s{^/}{# .file /};s/^00[0-9a-f]+\s/\t/;s/^$__(\w+)(,__.*?)?$ section/q(.).lc($1)/e'} . " | as -o \"$ofile\"";
                        vprint 3, $cmd;
                        vsystem($cmd);
                    }
                    $extra_libs .= " " . $l if -e $ofile;
                }
                else {
                    $extra_libs .= " " . $l;
                    $rpath{ dirname($l) }++;
                }
            }
        }
        close XS;
        my ($rpath) = $Config{ccdlflags} =~ /^(.+rpath,)/;
        ($rpath) = $Config{ccdlflags} =~ m{^(.+-R,)/} unless $rpath;
        if ( !$rpath and $Config{gccversion} ) {
            $rpath = '-Wl,-rpath,';
        }
        $rpath =~ s/^-Wl,-E// if $rpath;    # already done via ccdlflags
                                            # $extra_libs .= " $rpath".join(" ".$rpath,keys %rpath) if $rpath and %rpath;
        vprint 4, "staticxs: $stash $extra_libs";
    }
    exit if opt('check');

$t0 = [gettimeofday] if opt('time');
    cc_harness( $cfile, $stash, $extra_libs ) unless opt('c');
    $elapsed = tv_interval($t0) if opt('time');
    vprint -1, "cc time: $elapsed" if opt('time');

if ( $lose and -s $Output ) {
        vprint 3, "Unlinking $cfile";
        unlink $cfile or _die("can't unlink $cfile: $!\n");
    }
}

sub cc_harness {
    my ( $cfile, $stash, $extra_libs ) = @_;
    use ExtUtils::Embed ();
    my $command = ExtUtils::Embed::ccopts . " -o $Output $cfile ";
    $command =~ s/\s-pipe\s/ /;    # Strip -pipe out of the compile flags so less memory is used building binaries
    $command .= $B::C::Flags::extra_cflags if $B::C::Flags::extra_cflags;
    $command .= " -I" . $_ for split /\s+/, opt('I');
    $command .= " -L" . $_ for split /\s+/, opt('L');
    $command .= " " . opt('Wc') if opt('Wc');
    my $ccflags = $command;

my $useshrplib = $Config{useshrplib};
    _die("--sharedxs with useshrplib=false\n") if !$useshrplib and opt('sharedxs');
    my $ldopts;
    if ($stash) {
        my @mods = split /,?-?u/, $stash;    # XXX -U stashes
        $ldopts = ExtUtils::Embed::ldopts( "-std", \@mods );
    }
    else {
        $ldopts = ExtUtils::Embed::ldopts("-std");
    }
    $ldopts .= " " . opt('Wl') if opt('Wl');

# gcc crashes with this duplicate -fstack-protector arg
    my $ldflags = $Config{ldflags};
    my $libperl = $Config{libperl};
    my $libdir  = $Config{prefix} . "/lib";
    my $coredir = $ENV{PERL_SRC} || $Config{archlib} . "/CORE";
    if ($extra_libs) {

# splice extra_libs after $Config{ldopts} before @archives
        my $i_ldopts = index( $ldopts, $ldflags );
        if ( $ldflags and $i_ldopts >= 0 ) {
            my $l = $i_ldopts + length($ldflags);
            $ldopts = substr( $ldopts, 0, $l ) . $extra_libs . " " . substr( $ldopts, $l );
        }
        else {
            $ldopts = $extra_libs . " " . $ldopts;
        }
    }
    if ( opt('shared') ) {
        warn "--shared with useshrplib=false might not work\n" unless $useshrplib;
        my @plibs = ( $libperl, "$coredir/$libperl", "$libdir/$libperl" );
        if ( $libperl !~ /$Config{dlext}$/ ) {
            $libperl = "libperl." . $Config{dlext};
            @plibs = ( $libperl, "$coredir/$libperl", "$libdir/$libperl" );
            push @plibs, glob "$coredir/*perl5*" . $Config{dlext};
            push @plibs, glob "$coredir/*perl." . $Config{dlext};
            push @plibs, glob $libdir . "/*perl5*." . $Config{dlext};
            push @plibs, glob $libdir . "/*perl." . $Config{dlext};
            push @plibs, glob $Config{bin} . "/perl*." . $Config{dlext};
        }
        for my $lib (@plibs) {
            if ( -e $lib ) {
                $ldopts =~ s|-lperl |$lib |;
                $ldopts =~ s|\s+\S+libperl\w+\.a | $lib |;
                $ldopts = "$coredir/DynaLoader.o $ldopts" if -e "$coredir/DynaLoader.o";
                last;
            }
        }
    }
    elsif ( opt('static') ) {
        for my $lib (
            $libperl,             "$coredir/$libperl", "$coredir/$libperl",
            "$coredir/libperl.a", "$libdir/libperl.a"
        ) {
            if ( -e $lib ) {
                $ldopts =~ s|-lperl |$lib |;
                $ldopts = "$coredir/DynaLoader.o $ldopts" if -e "$coredir/DynaLoader.o";
                last;
            }
        }
    }
    else {
        if ( $useshrplib and -e $libdir . "/" . $Config{libperl} ) {

# debian: only /usr/lib/libperl.so.5.10.1 and broken ExtUtils::Embed::ldopts
            $ldopts =~ s|-lperl |$libdir/$Config{libperl} |;
        }
        if ( $useshrplib and -e $coredir . "/" . $Config{libperl} ) {

# help cygwin debugging, and workaround wrong debian linker prefs (/usr/lib before given -L)
            $ldopts =~ s|-lperl |$coredir/$Config{libperl} |;
        }
    }
    $ldopts .= " -lperl" unless $command =~ /perl/;
    $command .= " " . $ldopts;
    $command .= $B::C::Flags::extra_libs if $B::C::Flags::extra_libs;
    $command = q{-g } . $command if $Options->{'g'};
    my $gcc = get_gcc();
    $command =~ s/\s\s+|\t/ /g;
    vprint 3, "Calling $gcc $command";
    vsystem("$gcc $command");
    _die(qq[Failed to run gcc: $gcc $command\n]) unless $? == 0;

return;
}

{
    my $GCC;    # state variable

sub get_gcc {
        if ( !defined $GCC ) {
            $GCC = qx{which gcc};
            chomp $GCC;
            $GCC = '' unless -x $GCC;
        }

return $GCC if length $GCC;
        return $Config{cc};
    }
}

# Where Perl is, and which include path to give it.
sub yclept {
    my $command = $^X =~ m/\s/ ? qq{"$^X"} : $^X;

# DWIM the -I to be Perl, not C, include directories.
    if ( opt('I') && $Backend eq "Bytecode" ) {
        for ( split /\s+/, opt('I') ) {
            if ( -d $_ ) {
                push @INC, $_;
            }
            else {
                warn "$0: Include directory $_ not found, skipping\n";
            }
        }
    }
    my %OINC;
    $OINC{ $Config{$_} }++ for (qw(privlib archlib sitelib sitearch vendorlib vendorarch));
    $OINC{'.'}++ unless ${^TAINT};
    $OINC{$_}++ for split ':', $Config{otherlibdirs};
    if ( my $incver = $Config{inc_version_list} ) {
        my $incpre = dirname( $Config{sitelib} );
        $OINC{$_}++ for map { File::Spec->catdir( $incpre, $_ ) } split( ' ', $incver );
        $OINC{$incpre}++;
    }

return $command;
}

# Use B::Stash to find additional modules and stuff.
{
    my $_stash;

sub grab_stash {
        warn "already called grab_stash once" if $_stash;

my $taint =
            opt('T') ? ' -T'
          : opt('t') ? ' -t'
          :            '';
        my $command = "$BinPerl$taint -MB::Stash -c $Input";

# Filename here is perfectly sanitised.
        $command =~ s/\s\s+|\t/ /g;
        vprint 3, "Calling $command\n";

my ( $stash_r, $error_r, $errcode ) = spawnit($command);
        my @stash = @$stash_r;
        my @error = @$error_r;

if ( @error && $errcode != 0 ) {
            _die("$Input did not compile $errcode:\n@error\n");
        }

# band-aid for modules with noisy BEGIN {}
        foreach my $i (@stash) {
            $i =~ m/-[ux](?:[\w:]+|\<none\>)$/ and $stash[0] = $i and next;
            push @begin_output, $i;
        }
        chomp $stash[0];
        $stash[0] =~ s/,-[ux]\<none\>//;
        $stash[0] =~ s/^.*?-([ux])/-$1/s;
        vprint 2, "Stash: ", join " ", split /,?-[ux]/, $stash[0];
        chomp $stash[0];
        return $_stash = $stash[0];
    }
}

{
    # check if B is required or not: when B is not in the program dependencies then add -UB
    sub adjust_options_for_B_dependency {
        my ( $input, $opts ) = @_;    # do not use the global variables directly

# preserve custom choice when passing B as -u ot -U
        return if grep { $_ eq 'B' } @{ $opts->{u} }, @{ $opts->{U} };

local ( $?, $! );             # if not localized this is going to fail later....
        my $perl_program;

if ( my $opt_e_value = opt('e') ) {    # could also reparse input, but use the raw value
            ( undef, $perl_program ) = tempfile( "tmp-bc-check-B-XXXXXXXX", SUFFIX => '.pl', UNLINK => 1 );
            open my $tmp, '>', $perl_program or die "Cannot open $perl_program: $!";
            print {$tmp} "#!$^X\n\n";
            print {$tmp} $opt_e_value;
            print {$tmp} "\n";
            close $tmp;
        }
        else {                                 # -f $input
            $perl_program = $input;
        }

# do a first check to see if you can use our module
        my $check  = qx{$^X -c $perl_program 2>&1};
        my $status = $?;
        if ( $status != 0 ) {
            vprint 2, "Program do not pass 'perl -c' check";
            vprint 4, $check;
            return;
        }

# now check if B is used
        $check  = qx{$^X -MB::C::IsUsingModule=B -c $perl_program 2>&1};
        $status = $?;
        vprint 4, '-MB::C::IsUsingModule=B -c', $status;

# $? => 0 if B is used ; 1 if B is not used
        if ( $status == 0 ) {
            vprint 3, "B is used by the program";

#push @{ $opts->{u} }, 'B'; # not really needed
        }
        else {
            vprint 3, "B is not used by the program: adding -UB to skip it";
            push @{ $opts->{U} }, 'B';
        }
    }

return;
}

# Check the consistency of options if -B is selected.
# To wit, (-B|-O) ==> no -shared, no -S, no -c
sub checkopts_byte {

_die("Please choose one of either -B and -O.\n") if opt('O');

for my $o (qw[shared sharedxs static]) {
        if ( exists( $Options->{$o} ) && $Options->{$o} ) {
            warn "$0: --$o incompatible with -B\n";
            delete $Options->{$o};
        }
    }

# TODO make -S produce an .asm also?
    for my $o (qw[c S]) {
        if ( exists( $Options->{$o} ) && $Options->{$o} ) {
            warn "$0: Compiling to bytecode is a one-pass process. ", "-$o ignored\n";
            delete $Options->{$o};
        }
    }

}

# Check the input and output files make sense, are read/writeable.
sub sanity_check {
    if ( $Input eq $Output ) {
        if ( $Input eq 'a.out' ) {
            _die("Compiling a.out is probably not what you want to do.\n");

# You fully deserve what you get now. No you *don't*. typos happen.
        }
        else {
            my $suffix = '';
            ( undef, $Output ) = tempfile( "plcXXXXX", SUFFIX => $suffix );
            warn "$0: Will not write output on top of input file, ", "compiling to $Output instead\n";
        }
    }
}

sub check_read {
    my $file = shift;
    unless ( -r $file ) {
        _die("Input file $file is a directory, not a file\n") if -d _;
        unless ( -e _ ) {
            _die("Input file $file was not found\n");
        }
        else {
            _die("Cannot read input file $file: $!\n");
        }
    }
    unless ( -f _ ) {

# XXX: die?  don't try this on /dev/tty
        warn "$0: WARNING: input $file is not a plain file\n";
    }
}

sub check_write {
    my $file = shift;
    if ( -d $file ) {
        _die("Cannot write on $file, is a directory\n");
    }
    if ( -e _ ) {
        _die("Cannot write on $file: $!\n") unless -w _;
    }
    unless ( -w '.' ) {
        _die("Cannot write in this directory: $!\n");
    }
}

sub check_perl {
    my $file = shift;
    if ( !-T $file && !$ENV{SKIP_CHECK_PERL} ) {
        warn "$0: Binary `$file' sure doesn't smell like perl source!\n";
        print "Checking file type... ";
        vsystem( "file", $file );
        _die("Please try a perlier file!\n");
    }

open( my $handle, "<", $file ) or _die("Can't open $file: $!\n");
    local $_ = <$handle>;
    if ( /^#!/ && !/perl/ ) {
        _die( "$file is a ", /^#!\s*(\S+)/, " script, not perl\n" );
    }
}

# File spawning and error collecting
sub spawnit {
    my $command = shift;
    my ( @error, @output, $errname, $errcode );
    if ( opt('dryrun') ) {
        print "$command\n";
    }
    elsif ( $Options->{spawn} ) {
        ( undef, $errname ) = tempfile("pccXXXXX");
        {
            my $pid = open( S_OUT, "$command 2>$errname |" )
              or _die("Couldn't spawn the compiler.\n");
            $errcode = $?;
            my $kid;
            do {
                $kid = waitpid( $pid, 0 );
            } while $kid > 0;
            @output = <S_OUT>;
        }
        open( S_ERROR, $errname ) or _die("Couldn't read the error file.\n");
        @error = <S_ERROR>;
        close S_ERROR;
        close S_OUT;
        unlink $errname or _die("Can't unlink error file $errname\n");
    }
    else {
        @output = split /\n/, `$command`;
    }
    return ( \@output, \@error, $errcode );
}

sub version {
    require B::C::Flags;
    no warnings 'once';
    my $BC_VERSION = $B::C::Flags::VERSION . $B::C::REVISION;
    return "perlcc $VERSION, B-C-${BC_VERSION} built for $Config{perlpath} $Config{archname}\n";
}

sub helpme {
    print version(), "\n";
    if ( opt('v') ) {
        pod2usage( -verbose => opt('v') );
    }
    else {
        pod2usage( -verbose => 0 );
    }
}

sub relativize {
    my ($args) = @_;

return ( "./" . basename($args) ) if ( $args =~ m"^[/\\]" );
    return ("./$args");
}

sub _die {
    my @args = ( "$0: ", @_ );
    $logfh->print(@args) if opt('log');
    print STDERR @args;
    exit();    # should die eventually. However, needed so that a 'make compile'
               # can compile all the way through to the end for standard dist.
}

sub _usage_and_die {
    _die(<<EOU);
Usage:
$0 [-o executable] [-h][-r] [-O|-B|-c|-S] [-I /foo] [-L /foo] [--log log] [source[.pl] | -e code]
More options (see perldoc perlcc)
  -v[1-4]
  --stash --shared --static
  --time
EOU
}

sub run {
    my (@commands) = @_;

my $t0 = [gettimeofday] if opt('time');
    if ( !opt('log') ) {
        print interruptrun(@commands);
    }
    else {
        $logfh->print( interruptrun(@commands) );
    }
    my $elapsed = tv_interval($t0) if opt('time');
    vprint -1, "r time: $elapsed" if opt('time');
}

sub interruptrun {
    my (@commands) = @_;

my $command = join( '', @commands );
    local (*FD);
    my $pid = open( FD, "$command |" );
    my $text;

local ( $SIG{HUP}, $SIG{INT} ) if exists $SIG{HUP};
    $SIG{HUP} = $SIG{INT} = sub { kill 9, $pid; exit }
      if exists $SIG{HUP};

my $needalarm =
      ( $ENV{PERLCC_TIMEOUT} && exists $SIG{ALRM} && $command =~ m"(^|\s)perlcc\s" );

eval {
        local ( $SIG{ALRM} ) =
          sub { die "INFINITE LOOP"; }
          if exists $SIG{ALRM};
        alarm( $ENV{PERLCC_TIMEOUT} ) if $needalarm;
        $text = join( '', <FD> );
        alarm(0) if $needalarm;
    };

if ($@) {
        eval { kill 'HUP', $pid };
        vprint 0, "SYSTEM TIMEOUT (infinite loop?)\n";
    }

close(FD);
    return ($text);
}

END {
    if ( $cfile && !opt('S') && !opt('c') && -e $cfile ) {
        vprint 4, "Unlinking $cfile";
        unlink $cfile;
    }
    if ( defined $cfile && !opt('S') ) {
        vprint 4, "Unlinking $cfile.lst";
        unlink "$cfile.lst";
    }
}

__END__

=head1 NAME

perlcc - generate executables from Perl programs

=head1 SYNOPSIS

perlcc hello.pl            # Compiles into executable 'a.out'
    perlcc -o hello hello.pl   # Compiles into executable 'hello'

perlcc -O file.pl          # Compiles using the optimised CC backend
    perlcc -O3 file.pl         # Compiles with C, using -O3 optimizations
    perlcc -B file.pl          # Compiles using the bytecode backend
    perlcc -B -m file.pm       # Compiles a module to file.pmc

perlcc -c file.pl          # Creates a C file, 'file.c'
    perlcc -S -o hello file.pl # Keep C file
    perlcc -c out.c file.pl    # Creates a C file, 'out.c' from 'file'
    perlcc -r -o hello hello.pl # Compiles,links and runs with XS modules static/dynaloaded

perlcc -e 'print q//'      # Compiles a one-liner into 'a.out'
    perlcc -c -e 'print q//'   # Creates a C file 'a.out.c'

perlcc -I /foo hello       # extra headers for C
    perlcc -L /foo hello       # extra libraries for C
    perlcc --Wb=-Dsp           # extra perl compiler options
    perlcc -fno-delete-pkg     # extra perl compiler options
    perlcc --Wc=-fno-openmp    # extra C compiler options
    perlcc --Wl=-s             # extra C linker options

perlcc -uIO::Socket        # force saving IO::Socket
    perlcc -UB                 # "unuse" B, compile without any B symbols

perlcc -r hello            # compiles 'hello' into 'a.out', runs 'a.out'
    perlcc -r hello a b c      # compiles 'hello' into 'a.out', runs 'a.out'
                               # with arguments 'a b c'

perlcc hello -log c.log    # compiles 'hello' into 'a.out', log into 'c.log'

perlcc -h                  # help, only SYNOPSIS
    perlcc -v2 -h              # verbose help, also DESCRIPTION and OPTIONS (use v5 to enable verbose in B::C)
    perlcc --version           # prints internal perlcc and the B-C release version

=head1 DESCRIPTION

F<perlcc> creates standalone executables from Perl programs, using the
code generators provided by the L<B> module. At present, you may
either create executable Perl bytecode, using the C<-B> option, or
generate and compile C files using the standard and 'optimised' C
backends.

The code generated in this way is not guaranteed to work. The whole
codegen suite (C<perlcc> included) should be considered B<very>
experimental. Use for production purposes is strongly discouraged.

=head1 OPTIONS

=over 4

=item -LI<C library directories>

Adds the given directories to the library search path when C code is
passed to your C compiler.

=item -II<C include directories>

Adds the given directories to the include file search path when C code is
passed to your C compiler; when using the Perl bytecode option, adds the
given directories to Perl's include path.

=item -o I<output file name>

Specifies the file name for the final compiled executable.

Without given output file name we use the base of the input file,
or with C<-e> F<a.out> resp. F<a.exe> and a randomized intermediate
C filename.
If the input file is an absolute path on a non-windows system use
the basename.

=item -c I<C file name>

Create C file only; do not compile and link to a standalone binary.

=item -e I<perl code>

Compile a one-liner, much the same as C<perl -e '...'>

=item --check

Pass -c flag to the backend, prints all backend warnings to STDOUT
and exits before generating and compiling code. Similar to perl -c.

=item -S

"Keep source".
Do not delete generated C code after compilation.

=item -B

Use the Perl bytecode code generator.

=item --debug or -D

Shortcut for --Wb=-Dfull -S
to enable all debug levels and also preserve source code

=item -O

Use the 'optimised' C code generator B::CC. This is more experimental than
everything else put together, and the code created is not guaranteed to
compile in finite time and memory, or indeed, at all.

=item -OI<1-4>

Pass the numeric optimisation option to the compiler backend.
Shortcut for C<-Wb=-On>.

This does not enforce B::CC.

=item -v I<0-6>

Set verbosity of output from 0 to max. 6.

=item -r

Run the resulting compiled script after compiling it.

=item --log I<logfile>

Log the output of compiling to a file rather than to stdout.

=item -f<option> or --f=<option>

Pass the options to the compiler backend, such as
C<-fstash> or C<-fno-delete-pkg>.

=item --Wb=I<options>

Pass the options to the compiler backend, such as C<--Wb=-O2,-v>

=item --Wc=I<options>

Pass comma-seperated options to cc.

=item --Wl=I<options>

Pass comma-seperated options to ld.

=item -T or -t

run the backend using perl -T or -t

=item -u package

Add package(s) to compiler and force linking to it.

=item -U package

Skip package(s). Do not compile and link the package and its sole dependencies.

=item --stash

Detect external packages automatically via B::Stash

=item --static

Link to static libperl.a

=item --shared

Link to shared libperl

=item --sharedxs

Link shared XSUBs if the linker supports it. No DynaLoader needed.
This will still require the shared XSUB libraries to be installed
at the client, modification of @INC in the source is probably required.
(Not yet implemented)

=item -m|--sharedlib [Modulename]

Create a module, resp. a shared library.
Currently only enabled for Bytecode and CC. I<(not yet tested)>

=item --time

Benchmark the different phases B<c> I<(B::* compilation)>,
B<cc> I<(cc compile + link)>, and B<r> (runtime).

=item --no-spawn

Do not spawn subprocesses for compilation, because broken
shells might not be able to kill its children.

=back

=cut

# Local Variables:
#   mode: cperl
#   cperl-indent-level: 4
#   fill-column: 100
# End:
# vim: expandtab shiftwidth=4:

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Editing: perlcc

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