path: root/configure.in

dnl configure.in for libevent
dnl Dug Song <dugsong@monkey.org>
AC_PREREQ(2.59c)
AC_INIT(event.c)

AC_CONFIG_MACRO_DIR([m4])

AM_INIT_AUTOMAKE(libevent,2.0.10-stable-dev)
AM_CONFIG_HEADER(config.h)
AC_DEFINE(NUMERIC_VERSION, 0x02000a01, [Numeric representation of the version])

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

AC_CANONICAL_BUILD
AC_CANONICAL_HOST
dnl the 'build' machine is where we run configure and compile
dnl the 'host' machine is where the resulting stuff runs.

case "$host_os" in

 osf5*)
    CFLAGS="$CFLAGS -D_OSF_SOURCE"
    ;;
esac

dnl Checks for programs.
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MKDIR_P

AC_PROG_GCC_TRADITIONAL

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

enable_libevent_install_def=yes
enable_libevent_regress_def=yes

AC_ARG_ENABLE(gcc-warnings,
     AS_HELP_STRING(--enable-gcc-warnings, enable verbose warnings with GCC))
AC_ARG_ENABLE(thread-support,
     AS_HELP_STRING(--disable-thread-support, disable support for threading),
	[], [enable_thread_support=yes])
AC_ARG_ENABLE(malloc-replacement,
     AS_HELP_STRING(--disable-malloc-replacement, disable support for replacing the memory mgt functions),
        [], [enable_malloc_replacement=yes])
AC_ARG_ENABLE(openssl,
     AS_HELP_STRING(--disable-openssl, disable support for openssl encryption),
        [], [enable_openssl=yes])
AC_ARG_ENABLE(debug-mode,
     AS_HELP_STRING(--disable-debug-mode, disable support for running in debug mode),
        [], [enable_debug_mode=yes])
AC_ARG_ENABLE([libevent-install],
     AS_HELP_STRING([--disable-libevent-install, disable installation of libevent]),
	[], [enable_libevent_install=$enable_libevent_install_def])
AC_ARG_ENABLE([libevent-regress],
     AS_HELP_STRING([--disable-libevent-regress, skip regress in  make check]),
	[], [enable_libevent_regress=$enable_libevent_regress_def])

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)

AM_CONDITIONAL([BUILD_REGRESS], [test "$enable_libevent_regress" = "yes"])
if test "$enable_libevent_regress" = "yes" ; then
    CHECK_REGRESS=regress
else
    CHECK_REGRESS=
fi
AC_SUBST([CHECK_REGRESS])

dnl Checks for libraries.
AC_SEARCH_LIBS([inet_ntoa], [nsl])
AC_SEARCH_LIBS([socket], [socket])
AC_SEARCH_LIBS([inet_aton], [resolv])
AC_SEARCH_LIBS([clock_gettime], [rt])
AC_SEARCH_LIBS([sendfile], [sendfile])

AC_CHECK_HEADERS([zlib.h])

if test "x$ac_cv_header_zlib_h" = "xyes"; then
dnl Determine if we have zlib for regression tests
dnl Don't put this one in LIBS
save_LIBS="$LIBS"
LIBS=""
ZLIB_LIBS=""
have_zlib=no
AC_SEARCH_LIBS([inflateEnd], [z],
	[have_zlib=yes
	ZLIB_LIBS="$LIBS"
	AC_DEFINE(HAVE_LIBZ, 1, [Define if the system has zlib])])
LIBS="$save_LIBS"
AC_SUBST(ZLIB_LIBS)
fi
AM_CONDITIONAL(ZLIB_REGRESS, [test "$have_zlib" = "yes"])

dnl See if we have openssl.  This doesn't go in LIBS either.
if test "$enable_openssl" = "yes"; then
save_LIBS="$LIBS"
LIBS=""
OPENSSL_LIBS=""
have_openssl=no
AC_SEARCH_LIBS([SSL_new], [ssl],
		[have_openssl=yes
	        OPENSSL_LIBS="$LIBS"
		AC_DEFINE(HAVE_OPENSSL, 1, [Define if the system has openssl])])
LIBS="$save_LIBS"
AC_SUBST(OPENSSL_LIBS)
fi

dnl Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([fcntl.h stdarg.h inttypes.h stdint.h stddef.h poll.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/in.h netinet/in6.h sys/socket.h sys/uio.h arpa/inet.h sys/eventfd.h sys/mman.h sys/sendfile.h sys/wait.h netdb.h])
AC_CHECK_HEADERS(sys/sysctl.h, [], [], [
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
])
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

if test "x$ac_cv_header_sys_sysctl_h" = "xyes"; then
	AC_CHECK_DECLS([CTL_KERN, KERN_RANDOM, RANDOM_UUID, KERN_ARND], [], [],
	   [[#include <sys/types.h>
	     #include <sys/sysctl.h>]]
	)
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)

if test x$bwin32 = xtrue; then
   AC_SEARCH_LIBS([getservbyname],[ws2_32])
fi

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])
AC_CHECK_FUNCS([getnameinfo strlcpy inet_ntop inet_pton signal sigaction strtoll inet_aton pipe eventfd sendfile mmap splice arc4random arc4random_buf issetugid geteuid getegid getprotobynumber setenv unsetenv putenv])

AC_CACHE_CHECK(
    [for getaddrinfo],
    [libevent_cv_getaddrinfo],
    [AC_LINK_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_NETDB_H
		#include <netdb.h>
		#endif
	    ]],
	    [[
		getaddrinfo;
	    ]]
	)],
	[libevent_cv_getaddrinfo=yes],
	[libevent_cv_getaddrinfo=no]
    )]
)
if test "$libevent_cv_getaddrinfo" = "yes" ; then
    AC_DEFINE([HAVE_GETADDRINFO], [1], [Do we have getaddrinfo()?])
else

AC_CHECK_FUNCS([getservbyname])
# Check for gethostbyname_r in all its glorious incompatible versions.
#   (This is cut-and-pasted from Tor, which based its logic on
#   Python's configure.in.)
AH_TEMPLATE(HAVE_GETHOSTBYNAME_R,
  [Define this if you have any gethostbyname_r()])

AC_CHECK_FUNC(gethostbyname_r, [
  AC_MSG_CHECKING([how many arguments gethostbyname_r() wants])
  OLD_CFLAGS=$CFLAGS
  CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS"
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
#include <netdb.h>
  ], [[
    char *cp1, *cp2;
    struct hostent *h1, *h2;
    int i1, i2;
    (void)gethostbyname_r(cp1,h1,cp2,i1,&h2,&i2);
  ]])],[
    AC_DEFINE(HAVE_GETHOSTBYNAME_R)
    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARG, 1,
     [Define this if gethostbyname_r takes 6 arguments])
    AC_MSG_RESULT(6)
  ], [
    AC_TRY_COMPILE([
#include <netdb.h>
    ], [
      char *cp1, *cp2;
      struct hostent *h1;
      int i1, i2;
      (void)gethostbyname_r(cp1,h1,cp2,i1,&i2);
    ], [
      AC_DEFINE(HAVE_GETHOSTBYNAME_R)
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARG, 1,
        [Define this if gethostbyname_r takes 5 arguments])
      AC_MSG_RESULT(5)
   ], [
      AC_TRY_COMPILE([
#include <netdb.h>
     ], [
       char *cp1;
       struct hostent *h1;
       struct hostent_data hd;
       (void) gethostbyname_r(cp1,h1,&hd);
     ], [
       AC_DEFINE(HAVE_GETHOSTBYNAME_R)
       AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARG, 1,
         [Define this if gethostbyname_r takes 3 arguments])
       AC_MSG_RESULT(3)
     ], [
       AC_MSG_RESULT(0)
     ])
  ])
 ])
 CFLAGS=$OLD_CFLAGS
])

fi

AC_CHECK_SIZEOF(long)

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
if test x$bwin32 != xtrue; then
    AC_CHECK_FUNCS(select, [haveselect=yes], )
    if test "x$haveselect" = "xyes" ; then
 	needsignal=yes
    fi
fi
AM_CONDITIONAL(SELECT_BACKEND, [test "x$haveselect" = "xyes"])

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

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

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);

	memset(&ev, 0, sizeof(ev));
	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])
    havekqueue=yes
    ], AC_MSG_RESULT(no), AC_MSG_RESULT(no))
	fi
fi
AM_CONDITIONAL(KQUEUE_BACKEND, [test "x$havekqueue" = "xyes"])

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

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

if test "x$bwin32" = "xtrue"; then
	needsignal=yes
fi

AM_CONDITIONAL(SIGNAL_SUPPORT, [test "x$needsignal" = "xyes"])

AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T

AC_CHECK_TYPES([uint64_t, uint32_t, uint16_t, uint8_t, uintptr_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_SYS_SELECT_H
#include <sys/select.h>
#endif])

AC_CHECK_SIZEOF(long long)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(size_t)
AC_CHECK_SIZEOF(void *)

AC_CHECK_TYPES([struct in6_addr, struct sockaddr_in6, sa_family_t, struct addrinfo, struct sockaddr_storage], , ,
[#define _GNU_SOURCE
#include <sys/types.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef WIN32
#define WIN32_WINNT 0x400
#define _WIN32_WINNT 0x400
#define WIN32_LEAN_AND_MEAN
#if defined(_MSC_VER) && (_MSC_VER < 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
])
AC_CHECK_MEMBERS([struct in6_addr.s6_addr32, struct in6_addr.s6_addr16, struct sockaddr_in.sin_len, struct sockaddr_in6.sin6_len, struct sockaddr_storage.ss_family, struct sockaddr_storage.__ss_family], , ,
[#include <sys/types.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef WIN32
#define WIN32_WINNT 0x400
#define _WIN32_WINNT 0x400
#define WIN32_LEAN_AND_MEAN
#if defined(_MSC_VER) && (_MSC_VER < 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#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__])))


# check if we can compile with pthreads
have_pthreads=no
if test x$bwin32 != xtrue && test "$enable_thread_support" != "no"; then
  ACX_PTHREAD([
	AC_DEFINE(HAVE_PTHREADS, 1,
		[Define if we have pthreads on this system])
	have_pthreads=yes])
  CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
  AC_CHECK_SIZEOF(pthread_t, ,
     [AC_INCLUDES_DEFAULT()
      #include <pthread.h> ]
  )
fi
AM_CONDITIONAL(PTHREADS, [test "$have_pthreads" != "no" && test "$enable_thread_support" != "no"])

# check if we should compile locking into the library
if test x$enable_thread_support = xno; then
   AC_DEFINE(DISABLE_THREAD_SUPPORT, 1,
	[Define if libevent should not be compiled with thread support])
fi

# check if we should hard-code the mm functions.
if test x$enable_malloc_replacement = xno; then
  AC_DEFINE(DISABLE_MM_REPLACEMENT, 1,
        [Define if libevent should not allow replacing the mm functions])
fi

# check if we should hard-code debugging out
if test x$enable_debug_mode = xno; then
  AC_DEFINE(DISABLE_DEBUG_MODE, 1,
        [Define if libevent should build without support for a debug mode])
fi

# check if we have and should use openssl
AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl" = "yes"])

# 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$enable_gcc_warnings = xyes && test "$GCC" = "yes"; 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)

  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__GNUC__) || (__GNUC__ < 4) || (__GNUC__ == 4 && __GNUC_MINOR__ < 5)
#error
#endif])], have_gcc45=yes, have_gcc45=no)

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

  if test x$have_gcc45 = xyes ; then
    # These warnings work on gcc 4.5
    CFLAGS="$CFLAGS -Wlogical-op"
  fi
##This will break the world on some 64-bit architectures
# CFLAGS="$CFLAGS -Winline"

fi

LIBEVENT_GC_SECTIONS=
if test "$GCC" = yes ; then
    AC_CACHE_CHECK(
	[if linker supports omitting unused code and data],
	[libevent_cv_gc_sections_works],
	[
	    origCFLAGS="$CFLAGS"
	    CFLAGS="$CFLAGS -Wl,--gc-sections"
	    AC_LINK_IFELSE(
		[AC_LANG_PROGRAM([[]], [[]])],
		[
		    if grep gc-sections conftest.err ; then
			libevent_cv_gc_sections_works=no
		    else
			libevent_cv_gc_sections_works=yes
		    fi
		],
		[libevent_cv_gc_sections_works=no]
	    )
	    CFLAGS="$origCFLAGS"
	    AS_UNSET([origCFLAGS])
	]
    )
    case "$libevent_cv_gc_sections_works" in
     yes)
	CFLAGS="-ffunction-sections -fdata-sections $CFLAGS"
	LIBEVENT_GC_SECTIONS="-Wl,--gc-sections"
	;;
    esac
fi
AC_SUBST([LIBEVENT_GC_SECTIONS])

AM_CONDITIONAL([INSTALL_LIBEVENT], [test "$enable_libevent_install" = "yes"])

AC_CONFIG_FILES( [libevent.pc libevent_openssl.pc libevent_pthreads.pc] )
AC_OUTPUT(Makefile include/Makefile test/Makefile sample/Makefile)