dnl configure.in for libevent
dnl Dug Song <dugsong@monkey.org>
AC_INIT(event.c)

AM_INIT_AUTOMAKE(libevent,1.4.14b-stable)
AM_CONFIG_HEADER(config.h)
dnl AM_MAINTAINER_MODE

AC_CANONICAL_HOST

AC_DEFINE(NUMERIC_VERSION, 0x01040e00, [Numeric representation of the version])

dnl Initialize prefix.
if test "$prefix" = "NONE"; then
   prefix="/usr/local"
fi

dnl Checks for programs.
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_LN_S

AC_PROG_GCC_TRADITIONAL
if test "$GCC" = yes ; then
        CFLAGS="$CFLAGS -Wall"
        # And disable the strict-aliasing optimization, since it breaks
        # our sockaddr-handling code in strange ways.
        CFLAGS="$CFLAGS -fno-strict-aliasing"
fi

dnl Libevent 1.4 isn't multithreaded, but some of its functions are
dnl documented to be reentrant.  If you don't define the right macros
dnl on some platforms, you get non-reentrant versions of the libc
dnl functinos (like an errno that's shared by all threads).
AC_MSG_CHECKING([whether we need extra flags to make libc reentrant])
case $host in
   *solaris* | *-osf* | *-hpux* )
     AC_MSG_RESULT([-D_REENTRANT])
     CFLAGS="$CFLAGS -D_REENTRANT"
     ;;
   *-aix* | *-freebsd* | *-darwin* )
     AC_MSG_RESULT([-D_THREAD_SAFE])
     CFLAGS="$CFLAGS -D_THREAD_SAFE"
     ;;
   *)
     AC_MSG_RESULT(no)
     ;;
esac

AC_ARG_ENABLE(gcc-warnings,
     AS_HELP_STRING(--enable-gcc-warnings, enable verbose warnings with GCC))

AC_PROG_LIBTOOL

dnl   Uncomment "AC_DISABLE_SHARED" to make shared librraries not get
dnl   built by default.  You can also turn shared libs on and off from 
dnl   the command line with --enable-shared and --disable-shared.
dnl AC_DISABLE_SHARED
AC_SUBST(LIBTOOL_DEPS)

dnl Checks for libraries.
AC_CHECK_LIB(socket, socket)
AC_CHECK_LIB(resolv, inet_aton)
AC_CHECK_LIB(rt, clock_gettime)
AC_CHECK_LIB(nsl, inet_ntoa)

dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS(fcntl.h stdarg.h inttypes.h stdint.h poll.h signal.h unistd.h sys/epoll.h sys/time.h sys/queue.h sys/event.h sys/param.h sys/ioctl.h sys/select.h sys/devpoll.h port.h netinet/in6.h sys/socket.h)
if test "x$ac_cv_header_sys_queue_h" = "xyes"; then
	AC_MSG_CHECKING(for TAILQ_FOREACH in sys/queue.h)
	AC_EGREP_CPP(yes,
[
#include <sys/queue.h>
#ifdef TAILQ_FOREACH
 yes
#endif
],	[AC_MSG_RESULT(yes)
	 AC_DEFINE(HAVE_TAILQFOREACH, 1,
		[Define if TAILQ_FOREACH is defined in <sys/queue.h>])],
	AC_MSG_RESULT(no)
	)
fi

if test "x$ac_cv_header_sys_time_h" = "xyes"; then
	AC_MSG_CHECKING(for timeradd in sys/time.h)
	AC_EGREP_CPP(yes,
[
#include <sys/time.h>
#ifdef timeradd
 yes
#endif
],	[ AC_DEFINE(HAVE_TIMERADD, 1,
		[Define if timeradd is defined in <sys/time.h>])
	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
)
fi

if test "x$ac_cv_header_sys_time_h" = "xyes"; then
	AC_MSG_CHECKING(for timercmp in sys/time.h)
	AC_EGREP_CPP(yes,
[
#include <sys/time.h>
#ifdef timercmp
 yes
#endif
],	[ AC_DEFINE(HAVE_TIMERCMP, 1,
		[Define if timercmp is defined in <sys/time.h>])
	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
)
fi

if test "x$ac_cv_header_sys_time_h" = "xyes"; then
	AC_MSG_CHECKING(for timerclear in sys/time.h)
	AC_EGREP_CPP(yes,
[
#include <sys/time.h>
#ifdef timerclear
 yes
#endif
],	[ AC_DEFINE(HAVE_TIMERCLEAR, 1,
		[Define if timerclear is defined in <sys/time.h>])
	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
)
fi

if test "x$ac_cv_header_sys_time_h" = "xyes"; then
	AC_MSG_CHECKING(for timerisset in sys/time.h)
	AC_EGREP_CPP(yes,
[
#include <sys/time.h>
#ifdef timerisset
 yes
#endif
],	[ AC_DEFINE(HAVE_TIMERISSET, 1,
		[Define if timerisset is defined in <sys/time.h>])
	  AC_MSG_RESULT(yes)] ,AC_MSG_RESULT(no)
)
fi

dnl - check if the macro WIN32 is defined on this compiler.
dnl - (this is how we check for a windows version of GCC)
AC_MSG_CHECKING(for WIN32)
AC_TRY_COMPILE(,
	[
#ifndef WIN32
die horribly
#endif
	],
	bwin32=true; AC_MSG_RESULT(yes),
	bwin32=false; AC_MSG_RESULT(no),
)

AM_CONDITIONAL(BUILD_WIN32, test x$bwin32 = xtrue)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_C_INLINE
AC_HEADER_TIME

dnl Checks for library functions.
AC_CHECK_FUNCS(gettimeofday vasprintf fcntl clock_gettime strtok_r strsep getaddrinfo getnameinfo strlcpy inet_ntop signal sigaction strtoll issetugid geteuid getegid)

AC_CHECK_SIZEOF(long)

if test "x$ac_cv_func_clock_gettime" = "xyes"; then
   AC_DEFINE(DNS_USE_CPU_CLOCK_FOR_ID, 1, [Define if clock_gettime is available in libc])
else
   AC_DEFINE(DNS_USE_GETTIMEOFDAY_FOR_ID, 1, [Define is no secure id variant is available])
fi

AC_MSG_CHECKING(for F_SETFD in fcntl.h)
AC_EGREP_CPP(yes,
[
#define _GNU_SOURCE
#include <fcntl.h>
#ifdef F_SETFD
yes
#endif
],	[ AC_DEFINE(HAVE_SETFD, 1,
	      [Define if F_SETFD is defined in <fcntl.h>])
	  AC_MSG_RESULT(yes) ], AC_MSG_RESULT(no))

needsignal=no
haveselect=no
AC_CHECK_FUNCS(select, [haveselect=yes], )
if test "x$haveselect" = "xyes" ; then
	AC_LIBOBJ(select)
	needsignal=yes
fi

havepoll=no
AC_CHECK_FUNCS(poll, [havepoll=yes], )
if test "x$havepoll" = "xyes" ; then
	AC_LIBOBJ(poll)
	needsignal=yes
fi

haveepoll=no
AC_CHECK_FUNCS(epoll_ctl, [haveepoll=yes], )
if test "x$haveepoll" = "xyes" ; then
	AC_DEFINE(HAVE_EPOLL, 1,
		[Define if your system supports the epoll system calls])
	AC_LIBOBJ(epoll)
	needsignal=yes
fi

havedevpoll=no
if test "x$ac_cv_header_sys_devpoll_h" = "xyes"; then
	AC_DEFINE(HAVE_DEVPOLL, 1,
		    [Define if /dev/poll is available])
        AC_LIBOBJ(devpoll)
fi

havekqueue=no
if test "x$ac_cv_header_sys_event_h" = "xyes"; then
	AC_CHECK_FUNCS(kqueue, [havekqueue=yes], )
	if test "x$havekqueue" = "xyes" ; then
		AC_MSG_CHECKING(for working kqueue)
		AC_TRY_RUN(
#include <sys/types.h>
#include <sys/time.h>
#include <sys/event.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

int
main(int argc, char **argv)
{
	int kq;
	int n;
	int fd[[2]];
	struct kevent ev;
	struct timespec ts;
	char buf[[8000]];

	if (pipe(fd) == -1)
		exit(1);
	if (fcntl(fd[[1]], F_SETFL, O_NONBLOCK) == -1)
		exit(1);

	while ((n = write(fd[[1]], buf, sizeof(buf))) == sizeof(buf))
		;

        if ((kq = kqueue()) == -1)
		exit(1);

	ev.ident = fd[[1]];
	ev.filter = EVFILT_WRITE;
	ev.flags = EV_ADD | EV_ENABLE;
	n = kevent(kq, &ev, 1, NULL, 0, NULL);
	if (n == -1)
		exit(1);
	
	read(fd[[0]], buf, sizeof(buf));

	ts.tv_sec = 0;
	ts.tv_nsec = 0;
	n = kevent(kq, NULL, 0, &ev, 1, &ts);
	if (n == -1 || n == 0)
		exit(1);

	exit(0);
}, [AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_WORKING_KQUEUE, 1,
		[Define if kqueue works correctly with pipes])
    AC_LIBOBJ(kqueue)], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
	fi
fi

haveepollsyscall=no
if test "x$ac_cv_header_sys_epoll_h" = "xyes"; then
	if test "x$haveepoll" = "xno" ; then
		AC_MSG_CHECKING(for epoll system call)
		AC_TRY_RUN(
#include <stdint.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/epoll.h>
#include <unistd.h>

int
epoll_create(int size)
{
	return (syscall(__NR_epoll_create, size));
}

int
main(int argc, char **argv)
{
	int epfd;

	epfd = epoll_create(256);
	exit (epfd == -1 ? 1 : 0);
}, [AC_MSG_RESULT(yes)
    AC_DEFINE(HAVE_EPOLL, 1,
	[Define if your system supports the epoll system calls])
    needsignal=yes
    AC_LIBOBJ(epoll_sub)
    AC_LIBOBJ(epoll)], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
	fi
fi

haveeventports=no
AC_CHECK_FUNCS(port_create, [haveeventports=yes], )
if test "x$haveeventports" = "xyes" ; then
	AC_DEFINE(HAVE_EVENT_PORTS, 1,
		[Define if your system supports event ports])
	AC_LIBOBJ(evport)
	needsignal=yes
fi
if test "x$bwin32" = "xtrue"; then
	needsignal=yes
fi
if test "x$bwin32" = "xtrue"; then
	needsignal=yes
fi
if test "x$needsignal" = "xyes" ; then
	AC_LIBOBJ(signal)
fi

AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_CHECK_TYPES([uint64_t, uint32_t, uint16_t, uint8_t], , ,
[#ifdef HAVE_STDINT_H
#include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
#include <inttypes.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif])
AC_CHECK_TYPES([fd_mask], , ,
[#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SELECT_H
#include <select.h>
#endif])

AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(short)
AC_CHECK_TYPES([struct in6_addr], , ,
[#ifdef WIN32
#include <winsock2.h>
#else
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif])

AC_MSG_CHECKING([for socklen_t])
AC_TRY_COMPILE([
 #include <sys/types.h>
 #include <sys/socket.h>],
  [socklen_t x;],
  AC_MSG_RESULT([yes]),
  [AC_MSG_RESULT([no])
  AC_DEFINE(socklen_t, unsigned int,
	[Define to unsigned int if you dont have it])]
)

AC_MSG_CHECKING([whether our compiler supports __func__])
AC_TRY_COMPILE([],
 [ const char *cp = __func__; ],
 AC_MSG_RESULT([yes]),
 AC_MSG_RESULT([no])
 AC_MSG_CHECKING([whether our compiler supports __FUNCTION__])
 AC_TRY_COMPILE([],
   [ const char *cp = __FUNCTION__; ],
   AC_MSG_RESULT([yes])
   AC_DEFINE(__func__, __FUNCTION__,
         [Define to appropriate substitue if compiler doesnt have __func__]),
   AC_MSG_RESULT([no])
   AC_DEFINE(__func__, __FILE__,
         [Define to appropriate substitue if compiler doesnt have __func__])))


# Add some more warnings which we use in development but not in the
# released versions.  (Some relevant gcc versions can't handle these.)
if test x$enable_gcc_warnings = xyes; then

  AC_COMPILE_IFELSE(AC_LANG_PROGRAM([], [
#if !defined(__GNUC__) || (__GNUC__ < 4)
#error
#endif]), have_gcc4=yes, have_gcc4=no)

  AC_COMPILE_IFELSE(AC_LANG_PROGRAM([], [
#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)
#error
#endif]), have_gcc42=yes, have_gcc42=no)

  CFLAGS="$CFLAGS -W -Wfloat-equal -Wundef -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -Wredundant-decls -Wchar-subscripts -Wcomment -Wformat=2 -Wwrite-strings -Wmissing-declarations -Wredundant-decls -Wnested-externs -Wbad-function-cast -Wswitch-enum -Werror"
  CFLAGS="$CFLAGS -Wno-unused-parameter -Wno-sign-compare -Wstrict-aliasing"

  if test x$have_gcc4 = xyes ; then 
    # These warnings break gcc 3.3.5 and work on gcc 4.0.2
    CFLAGS="$CFLAGS -Winit-self -Wmissing-field-initializers -Wdeclaration-after-statement"
    #CFLAGS="$CFLAGS -Wold-style-definition"
  fi

  if test x$have_gcc42 = xyes ; then 
    # These warnings break gcc 4.0.2 and work on gcc 4.2
    CFLAGS="$CFLAGS -Waddress -Wnormalized=id -Woverride-init"
  fi

##This will break the world on some 64-bit architectures
# CFLAGS="$CFLAGS -Winline"

fi

AC_OUTPUT(Makefile test/Makefile sample/Makefile)