makefile.pl

source of perl for linux application,

#!/usr/bin/perl
#
# In general we trust %Config, but for nanosleep() this trust
# may be misplaced (it may be linkable but not really functional).
# Use $ENV{FORCE_NANOSLEEP_SCAN} to force rescanning whether there
# really is hope.

require 5.002;

use Config;
use ExtUtils::MakeMaker;
use strict;

my $VERBOSE = $ENV{VERBOSE};
my $DEFINE;
my $LIBS = [];
my $XSOPT = '';
my $SYSCALL_H;

use vars qw($self); # Used in 'sourcing' the hints.

my $ld_exeext = ($^O eq 'cygwin' ||
                 $^O eq 'os2' && $Config{ldflags} =~ /-Zexe\b/) ? '.exe' : '';

unless($ENV{PERL_CORE}) {
    $ENV{PERL_CORE} = 1 if grep { $_ eq 'PERL_CORE=1' } @ARGV;
}

# Perls 5.002 and 5.003 did not have File::Spec, fake what we need.

sub my_dirsep {
    $^O eq 'VMS' ? '.' :
	$^O =~ /mswin32|netware|djgpp/i ? '\\' :
	    $^O eq 'MacOS' ? ':'
		: '/';
}

sub my_catdir {
    shift;
    my $catdir = join(my_dirsep, @_);
    $^O eq 'VMS' ? "[$catdir]" : $catdir;
}

sub my_catfile {
    shift;
    return join(my_dirsep, @_) unless $^O eq 'VMS';
    my $file = pop;
    return my_catdir (undef, @_) . $file;
}

sub my_updir {
    shift;
    $^O eq 'VMS' ? "-" : "..";
}

BEGIN {
    eval { require File::Spec };
    if ($@) {
	*File::Spec::catdir  = \&my_catdir;
	*File::Spec::updir   = \&my_updir;
	*File::Spec::catfile = \&my_catfile;
    }
}

# Avoid 'used only once' warnings.
my $nop1 = *File::Spec::catdir;
my $nop2 = *File::Spec::updir;
my $nop3 = *File::Spec::catfile;

# if you have 5.004_03 (and some slightly older versions?), xsubpp
# tries to generate line numbers in the C code generated from the .xs.
# unfortunately, it is a little buggy around #ifdef'd code.
# my choice is leave it in and have people with old perls complain
# about the "Usage" bug, or leave it out and be unable to compile myself
# without changing it, and then I'd always forget to change it before a
# release. Sorry, Edward :)

sub try_compile_and_link {
    my ($c, %args) = @_;

    my ($ok) = 0;
    my ($tmp) = "tmp$$";
    local(*TMPC);

    my $obj_ext = $Config{obj_ext} || ".o";
    unlink("$tmp.c", "$tmp$obj_ext");

    if (open(TMPC, ">$tmp.c")) {
	print TMPC $c;
	close(TMPC);

	my $cccmd = $args{cccmd};

	my $errornull;

	my $COREincdir;

	if ($ENV{PERL_CORE}) {
	    my $updir = File::Spec->updir;
	    $COREincdir = File::Spec->catdir(($updir) x 3);
	} else {
	    $COREincdir = File::Spec->catdir($Config{'archlibexp'}, 'CORE');
	}

	if ($ENV{PERL_CORE}) {
	    unless (-f File::Spec->catfile($COREincdir, "EXTERN.h")) {
		die <<__EOD__;
Your environment variable PERL_CORE is '$ENV{PERL_CORE}' but there
is no EXTERN.h in $COREincdir.
Cannot continue, aborting.
__EOD__
            }
        }

	my $ccflags = $Config{'ccflags'} . ' ' . "-I$COREincdir";

	if ($^O eq 'VMS') {
	    if ($ENV{PERL_CORE}) {
		# Fragile if the extensions change hierarchy within
		# the Perl core but this should do for now.
                $cccmd = "$Config{'cc'} /include=([---]) $tmp.c";
	    } else {
		my $perl_core = $Config{'installarchlib'};
		$perl_core =~ s/\]$/.CORE]/;
                $cccmd = "$Config{'cc'} /include=(perl_root:[000000],$perl_core) $tmp.c";
	    }
        }

        if ($args{silent} || !$VERBOSE) {
	    $errornull = "2>/dev/null" unless defined $errornull;
	} else {
	    $errornull = '';
	}

        $cccmd = "$Config{'cc'} -o $tmp $ccflags $tmp.c @$LIBS $errornull"
	    unless defined $cccmd;

       if ($^O eq 'VMS') {
	    open( CMDFILE, ">$tmp.com" );
	    print CMDFILE "\$ SET MESSAGE/NOFACILITY/NOSEVERITY/NOIDENT/NOTEXT\n";
	    print CMDFILE "\$ $cccmd\n";
	    print CMDFILE "\$ IF \$SEVERITY .NE. 1 THEN EXIT 44\n"; # escalate
	    close CMDFILE;
	    system("\@ $tmp.com");
	    $ok = $?==0;
	    for ("$tmp.c", "$tmp$obj_ext", "$tmp.com", "$tmp$Config{exe_ext}") {
		1 while unlink $_;
	    }
        }
        else
        {
	    my $tmp_exe = "$tmp$ld_exeext";
	    printf "cccmd = $cccmd\n" if $VERBOSE;
	    my $res = system($cccmd);
	    $ok = defined($res) && $res == 0 && -s $tmp_exe && -x _;

	    if ( $ok && exists $args{run} && $args{run}) {
		my $tmp_exe =
		    File::Spec->catfile(File::Spec->curdir, $tmp_exe);
		printf "Running $tmp_exe..." if $VERBOSE;
		if (system($tmp_exe) == 0) {
		    $ok = 1;
		} else {
		    $ok = 0;
		    my $errno = $? >> 8;
		    local $! = $errno;
		    printf <<EOF;

*** The test run of '$tmp_exe' failed: status $?
*** (the status means: errno = $errno or '$!')
*** DO NOT PANIC: this just means that *some* functionality will be missing.
EOF
		}
	    }
	    unlink("$tmp.c", $tmp_exe);
        }
    }

    return $ok;
}

my $TIME_HEADERS = <<EOH;
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifdef I_SYS_TYPES
#   include <sys/types.h>
#endif
#ifdef I_SYS_TIME
#   include <sys/time.h>
#endif
#ifdef I_SYS_SELECT
#   include <sys/select.h>	/* struct timeval might be hidden in here */
#endif
EOH

sub has_gettimeofday {
    # confusing but true (if condition true ==> -DHAS_GETTIMEOFDAY already)
    return 0 if $Config{d_gettimeod};
    return 1 if try_compile_and_link(<<EOM);
$TIME_HEADERS
static int foo()
{
    struct timeval tv;
    gettimeofday(&tv, 0);
}
int main(int argc, char** argv)
{
    foo();
}
EOM
    return 0;
}

sub has_x {
    my ($x, %args) = @_;

    return 1 if
    try_compile_and_link(<<EOM, %args);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#ifdef I_UNISTD
#   include <unistd.h>
#endif

#ifdef I_SYS_TYPES
#   include <sys/types.h>
#endif

#ifdef I_SYS_TIME
#   include <sys/time.h>
#endif

int main(int argc, char** argv)
{
	$x;
}
EOM
    return 0;
}

sub has_nanosleep {
    print "testing... ";
    return 1 if
    try_compile_and_link(<<EOM, run => 1);
#include <time.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

/* int nanosleep(const struct timespec *rqtp, struct timespec *rmtp); */

int main(int argc, char** argv) {
    struct timespec ts1, ts2;
    int ret;
    ts1.tv_sec  = 0;
    ts1.tv_nsec = 750000000;
    ts2.tv_sec  = 0;
    ts2.tv_nsec = 0;
    errno = 0;
    ret = nanosleep(&ts1, &ts2); /* E.g. in AIX nanosleep() fails and sets errno to ENOSYS. */
    ret == 0 ? exit(0) : exit(errno ? errno : -1);
}
EOM
}

sub has_include {
    my ($inc) = @_;
    return 1 if
    try_compile_and_link(<<EOM);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <$inc>
int main(int argc, char** argv)
{
	return 0;
}
EOM
    return 0;
}

sub has_clock_xxx_syscall {
    my $x = shift;
    return 0 unless defined $SYSCALL_H;
    return 1 if
    try_compile_and_link(<<EOM, run => 1);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <$SYSCALL_H>
int main(int argc, char** argv)
{
    struct timespec ts;
    /* Many Linuxes get ENOSYS even though the syscall exists. */
    /* All implementations are supposed to support CLOCK_REALTIME. */
    int ret = syscall(SYS_clock_$x, CLOCK_REALTIME, &ts);
    ret == 0 ? exit(0) : exit(errno ? errno : -1);
}
EOM
}

sub has_clock_xxx {
    my $xxx = shift;
    return 1 if
    try_compile_and_link(<<EOM, run => 1);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
int main(int argc, char** argv)
{
    struct timespec ts;
    int ret = clock_$xxx(CLOCK_REALTIME, &ts); /* Many Linuxes get ENOSYS. */
    /* All implementations are supposed to support CLOCK_REALTIME. */
    ret == 0 ? exit(0) : exit(errno ? errno : -1);
}
EOM
}

sub has_clock {
    return 1 if
    try_compile_and_link(<<EOM, run => 1);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
int main(int argc, char** argv)
{
    clock_t tictoc;
    clock_t ret = clock();
    ret == (clock_t)-1 ? exit(errno ? errno : -1) : exit(0);
}
EOM
}

sub has_clock_nanosleep {
    return 1 if
    try_compile_and_link(<<EOM, run => 1);
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include <time.h>
int main(int argc, char** argv)
{
    int ret;
    struct timespec ts1;
    struct timespec ts2;
    ts1.tv_sec  = 0;
    ts1.tv_nsec = 750000000;;
    ret = clock_nanosleep(CLOCK_MONOTONIC, 0, &ts1, &ts2);
    ret == 0 ? exit(0) : exit(errno ? errno : -1);
}
EOM
}

sub DEFINE {
    my ($def, $val) = @_;
    my $define = defined $val ? "$def=$val" : $def ;
    unless ($DEFINE =~ /(?:^| )-D\Q$define\E(?: |$)/) {
	$DEFINE .= " -D$define";
    }
}

sub init {
    my $hints = File::Spec->catfile("hints", "$^O.pl");
    if (-f $hints) {
	print "Using hints $hints...\n";
	local $self;
	do $hints;
	if (exists $self->{LIBS}) {
	    $LIBS = $self->{LIBS};
	    print "Extra libraries: @$LIBS...\n";
	}
    }

    $DEFINE = '';

    if ($Config{d_syscall}) {
	print "Have syscall()... looking for syscall.h... ";
	if (has_include('syscall.h')) {
	    $SYSCALL_H = 'syscall.h';
	} elsif (has_include('sys/syscall.h')) {
	    $SYSCALL_H = 'sys/syscall.h';
	}
    } else {
	print "No syscall()...\n";
    }

    if ($Config{d_syscall}) {
	if (defined $SYSCALL_H) {
	    print "found <$SYSCALL_H>.\n";
	} else {
	    print "NOT found.\n";
	}
    }

    print "Looking for gettimeofday()... ";
    my $has_gettimeofday;
    if (exists $Config{d_gettimeod}) {
	$has_gettimeofday++ if $Config{d_gettimeod};
    } elsif (has_gettimeofday()) {
	$DEFINE .= ' -DHAS_GETTIMEOFDAY';
	$has_gettimeofday++;
    }

    if ($has_gettimeofday) {
	print "found.\n";
    } else {
	die <<EOD
Your operating system does not seem to have the gettimeofday() function.
(or, at least, I cannot find it)

There is no way Time::HiRes is going to work.

I am awfully sorry but I cannot go further.

Aborting configuration.

EOD
    }

    print "Looking for setitimer()... ";
    my $has_setitimer;
    if (exists $Config{d_setitimer}) {
        $has_setitimer++ if $Config{d_setitimer};
    } elsif (has_x("setitimer(ITIMER_REAL, 0, 0)")) {
        $has_setitimer++;
        $DEFINE .= ' -DHAS_SETITIMER';
    }

    if ($has_setitimer) {
        print "found.\n";
    } else {