AC_PREREQ(2.59)

AC_INIT(src/torrent.cpp)
AM_INIT_AUTOMAKE(libtorrent, 0.13)

# Nowhere in the source is config.h included, so make defines command line arguments
# AM_CONFIG_HEADER(config.h)

AC_PROG_CC

if test -z "$(which $CC)"; then
    AC_MSG_ERROR([Unable to find a working C compiler, giving up.])
fi

AC_PROG_CPP
AC_PROG_CXX

if test -z "$(which $CXX)"; then
    AC_MSG_ERROR([Unable to find a working C++ compiler, giving up.])
fi

AC_CACHE_SAVE
AC_PROG_INSTALL
AC_PROG_MAKE_SET
AC_PROG_LIBTOOL
# AC_PROG_RANLIB is obsolete by AC_PROC_LIBTOOL

dnl Make sure that the asio header files are added.
ASIO_DIR=include/libtorrent/asio
AC_CHECK_FILES([$ASIO_DIR/../asio.hpp $ASIO_DIR/ssl/stream.hpp $ASIO_DIR/ip/tcp.hpp ],,AC_MSG_ERROR([ ASIO header files not found. Get them from asio.sourceforge.net and include or symlink them. Example: ln -s ../../../asio/include/asio.hpp include/libtorrent/asio.hpp && ln -s ../../../asio/include/asio include/libtorrent/asio ]) )
dnl check asio version

dnl Check for pthreads and boost libraries.
ACX_PTHREAD

AX_BOOST_DATE_TIME

dnl check that Boost.DateTime was found:
if test -z "$BOOST_DATE_TIME_LIB"; then
   AC_MSG_ERROR([Unable to find Boost.DateTime library, currently this is required.])
fi

AX_BOOST_FILESYSTEM

dnl check that Boost.Filesystem was found:
if test -z "$BOOST_FILESYSTEM_LIB"; then
   AC_MSG_ERROR([Unable to find Boost.Filesystem library, currently this is required.])
fi

AX_BOOST_THREAD

dnl check that Boost.Thread was found:
if test -z "$BOOST_THREAD_LIB"; then
   AC_MSG_ERROR([Unable to find Boost.Thread library, currently this is required.])
fi

AX_BOOST_REGEX

dnl check that Boost.Regex was found:
if test -z "$BOOST_REGEX_LIB"; then
   AC_MSG_RESULT([Unable to find Boost.Regex library, example test_client will not be build.])
   BUILD_TESTCLIENT=no;
fi

AX_BOOST_PROGRAM_OPTIONS

dnl check that Boost.Program_options was found:
if test -z "$BOOST_PROGRAM_OPTIONS_LIB"; then
   AC_MSG_RESULT([Unable to find Boost.Program_options library, example test_client will not be build.])
   BUILD_TESTCLIENT=no;
fi

if [[ "x$BUILD_TESTCLIENT" != "xno" ]]; then
	CLIENT_TEST_BIN=client_test;
	AC_SUBST(CLIENT_TEST_BIN)
fi

dnl try different ways of resolving gethostbyname
AC_CHECK_FUNC(gethostbyname, ,
	AC_CHECK_LIB(resolv, gethostbyname, ,
	AC_CHECK_LIB(nsl, gethostbyname, ,
	AC_CHECK_LIB(ws2_32, main, ,
	AC_CHECK_LIB(wsock32, main, ,
	AC_MSG_ERROR([gethostbyname not found. Stopped.])))))
)

dnl find out what kind of logging to use
AC_ARG_WITH(
	[logging],
	AS_HELP_STRING([--with-logging=none|default|verbose],[Specify how much logging to use. Default is none.]),
	[[logging=$withval]],
	[[logging=none]]
)
dnl Check the value for the --with-logging switch
AC_MSG_CHECKING([what form of logging to use])
case "$logging" in
	"none")
		AC_MSG_RESULT(none)
		;;
	"default")
		AC_MSG_RESULT(default)
		AC_DEFINE(TORRENT_LOGGING,,[define to use some logging])
		;;
	"verbose")
		AC_MSG_RESULT(verbose)
		AC_DEFINE(TORRENT_VERBOSE_LOGGING,,[define to use verbose logging])
		;;
	*)
		AC_MSG_RESULT()
		AC_MSG_ERROR([Unknown logging option "$logging". Use either "none", "default" or "verbose".])
		;;
esac

dnl find out what kind of dht-support to use
AC_ARG_WITH(
	[dht],
	AS_HELP_STRING([--with-dht=on|off|logging],[Specify how to use DHT support. Option logging will add extra logging. Default is on.]),
	[[dht=$withval]],
	[[dht=on]]
)
dnl Check the value for the --with-dht switch
AC_MSG_CHECKING([how to use DHT])
case "$dht" in
	"on")
		AC_MSG_RESULT(on)
		;;
	"off")
		AC_MSG_RESULT(off)
		AC_DEFINE(TORRENT_DISABLE_DHT,,[define not to use DHT support])
		;;
	"logging")
		AC_MSG_RESULT(logging)
		AC_DEFINE(TORRENT_DHT_VERBOSE_LOGGING,,[define to use DHT support with extra logging])
		;;
	*)
		AC_MSG_RESULT()
		AC_MSG_ERROR([Unknown dht option "$dht". Use either "on", "off" or "logging".])
		;;
esac
AM_CONDITIONAL(USE_DHT, test "x$dht" != "xoff")

dnl the user can choose which zlib to use
AC_ARG_WITH(
	[zlib],
	AS_HELP_STRING([--with-zlib=shipped|system],[Specify the zlib to use, shipped or system. Default is to autodetect system and fallback to shipped.]),
	[[zlib=$withval]],
	[[zlib=detect]]
)
dnl Check the value for the --with-zlib switch
AC_MSG_CHECKING([which zlib implementation to use])
case "$zlib" in
	"detect")
		AC_MSG_RESULT([autodetect])
		AC_CHECK_LIB(z, main,
			[zlib="system"],
			[zlib="shipped"]
		)
		;;
	"shipped")
		AC_MSG_RESULT(shipped)
		;;
	"system")
		AC_MSG_RESULT(system)
		AC_CHECK_LIB(z, main, ,
			AC_MSG_ERROR([libtorrent depends on zlib but zlib was not found on your system.])
		)
		;;
	"no")
		AC_MSG_RESULT()
		AC_MSG_ERROR([libtorrent depends on zlib, you must specify either "system" or "shipped".])
		;;
	*)
		AC_MSG_RESULT()
		AC_MSG_ERROR([Unknown zlib option "$zlib". Use either "system" or "shipped".])
		;;
esac
if [[ "$zlib" = "shipped" ]]; then
	ZLIB="\$(top_builddir)/zlib/libzlib.la"
	ZLIBDIR="zlib"
	ZLIBINCL="-I\$(top_srcdir)/zlib"
	AC_CONFIG_FILES(zlib/Makefile)
elif [[ "$zlib" = "system" ]]; then
	ZLIB="-lz"
	ZLIBDIR=""
	ZLIBINCL=""
fi

dnl make ZLIB and ZLIBDIR visible to Makefiles
AC_SUBST([ZLIB])
AC_SUBST([ZLIBDIR])
AC_SUBST([ZLIBINCL])

dnl Check whether the examples should be build
AC_ARG_ENABLE(
	[examples],
	AS_HELP_STRING([--enable-examples],[Build the examples. Default is not to build them.]),
	[[examples=$enableval]],
	[[examples=no]]
)
dnl Check the value of the --with-examples switch
AC_MSG_CHECKING([if the examples should be build])
case "$examples" in
	"yes")
		AC_MSG_RESULT(yes)
		EXAMPLESDIR="examples"
		;;
	"no")
		AC_MSG_RESULT(no)
		EXAMPLESDIR=""
		;;
	"")
		AC_MSG_RESULT(yes (default))
		EXAMPLESDIR="examples"
		;;
	*)
		AC_MSG_RESULT()
		AC_MSG_ERROR([Unknown --enable-examples option "$examples". Use either "yes" or "no".])
		;;
esac
dnl make $examples visible to Makefiles
AC_SUBST([EXAMPLESDIR])

dnl Set some defines if we are building a shared library
if [[ "x$enable_shared" == "xyes" ]]; then
	AC_DEFINE(TORRENT_BUILDING_SHARED,,[Make sure the functions and classes are exported.])
	AC_DEFINE(TORRENT_LINKING_SHARED,,[Make sure the functions and classes are exported.])
fi

dnl want some debugging symbols with that?
AC_ARG_ENABLE(
	[debug],
	AS_HELP_STRING([--enable-debug],[Set compiler flags for debug symbols, default is no debugging.]),
	[case "$enableval" in
		no)
			AC_DEFINE(NDEBUG,,[Define to disable debugging])
			DEBUGFLAGS=""
			;;
		yes)
			DEBUGFLAGS="-g"
			;;
		*)
			DEBUGFLAGS="$enableval"
			;;
	esac],
	[DEBUGFLAGS=""
	AC_DEFINE(NDEBUG,,[Define to disable debugging])]
)
AC_SUBST(DEBUGFLAGS)

AC_CONFIG_FILES(Makefile src/Makefile include/Makefile test/Makefile libtorrent.pc)
if [[ "x$examples" == "xyes" ]]; then
	AC_CONFIG_FILES(examples/Makefile)
fi
AC_OUTPUT