use 5.006;

use Config;
use ExtUtils::MakeMaker;


unless (-e "libev/ev_epoll.c") {
   print <<EOF;

***
*** ERROR: libev is missing or damaged. If you used a CVS check-out of EV,
*** you also have to check-out the "libev" module from the same CVS
*** repository into the EV dir (i.e. EV/libev from outside).
***

EOF
   exit 1;
}

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

Welcome to EV configuration. If you are in a hurry, just press return here
and hope for the best. The defaults should usually do.

EOF

if (prompt ("Skip further questions and use defaults (y/n)?", "y") =~ /[yY]/) {
   $ENV{PERL_MM_USE_DEFAULT} = 1;
}

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

POSIX optionally offers support for a monotonic clock source. EV
can take advantage of this clock source to detect time jumps
reliably. Unfortunately, some systems are bound to be broken, so you can
disable this here: you can completely disable the detection and use of
the monotonic clock by answering 'n' here. Support for this clock type
will otherwise be autodetected at both compile- and runtime.

EOF

if (prompt ("Enable optional support for CLOCK_MONOTONIC (y/n)?", "y") =~ /[yY]/) {
   $DEFINE .= " -DEV_USE_MONOTONIC";
}

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

POSIX optionally offers support for a (potentially) high-resolution
realtime clock interface. In a good implementation, using it is faster
than the normal method of using gettimeofday. Unfortunately, this option
is also bound to be broken on some systems, so you can disable use and
probing of this feature altogether here. Otherwise support for this clock
type will be autodetected at compiletime.

EOF

if (prompt ("Prefer clock_gettime (CLOCK_REALTIME) over gettimeofday (y/n)?", "y") !~ /[yY]/) {
   $DEFINE .= " -DEV_USE_REALTIME=0";
}

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

EV by default uses select, which makes it hard to write efficient servers,
especially if the number of active conencitons is much lower than the open
ones. GNU/Linux systems have a more scalable method called "epoll", which
EV can use. For this to work, both your kernel and glibc have to support
epoll, but if you can compile it, the detection will be done at runtime,
and EV will safely fall back to using select when epoll isn't available.
If unsure, accept the default.

EOF

if (prompt ("Enable epoll backend (y/n)?", (-e "/usr/include/sys/epoll.h") ? "y" : "n") =~ /[yY]/) {
   $DEFINE .= " -DEV_USE_EPOLL";
} 

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

Similarly to the epoll backend above, EV can take advantage of kqueue on
many BSD systems (it seems to be broken on Mac OS X though). The kqueue
backend has not been tested, however, so it is disabled by default. Please
test (and preferably fix) the kqueue backend when you have a machine
supporting it.  Support for kqueue will be detected at runtime, with a
safe fallback to other methods when it cannot be used.

EOF

if (prompt ("Enable kqueue backend (y/n)?", (-e "/usr/include/sys/event.h") ? "y" : "n") =~ /[yY]/) {
   $DEFINE .= " -DEV_USE_KQUEUE";
} 

print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

EV needs the functions pthread_atfork and clock_gettime. On most systems
you need some special libraries for this (such as -lrt and -lpthread). You
can specify additional libraries to provide these calls now, or accept the
default.

EOF

$LIBS = prompt "Extra libraries for pthread_atfork and clock_gettime?", "-lpthread -lrt";


print <<EOF;


*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

EOF

WriteMakefile(
    dist	=> {
	            PREOP	=> 'pod2text EV.pm | tee README >$(DISTVNAME)/README; chmod -R u=rwX,go=rX . ;',
	            COMPRESS	=> 'gzip -9v',
	            SUFFIX	=> '.gz',
	           },
    depend => {
       "EV.c" => "EV/EVAPI.h "
               . "libev/ev.c libev/ev.h libev/ev_epoll.c libev/ev_select.c libev/ev_kqueue.c libev/ev_poll.c "
               . "libev/event.h libev/event.c libev/evdns.h libev/evdns.c",
    },
    INC       => "-Ilibev",
    DEFINE    => "$DEFINE",
    NAME => "EV",
    LIBS => [$LIBS],
    VERSION_FROM => "EV.pm",
    PM           => {
    		    'EV.pm'		=> '$(INST_LIBDIR)/EV.pm',
    		    'EV/AnyEvent.pm'	=> '$(INST_LIBDIR)/EV/AnyEvent.pm',
                    'EV/DNS.pm'		=> '$(INST_LIBDIR)/EV/DNS.pm',
    		    'EV/EVAPI.h'	=> '$(INST_LIBDIR)/EV/EVAPI.h',
    		    'EV/MakeMaker.pm'	=> '$(INST_LIBDIR)/EV/MakeMaker.pm',
    		    'libev/ev.h'	=> '$(INST_LIBDIR)/EV/ev.h',
                 },
);