dnl ** This is a configure script template for BIRD
dnl ** Process it with autoconf to get ./configure
dnl ** (c) 1999--2000 Martin Mares <mj@ucw.cz>

AC_REVISION($Id$)
AC_INIT(conf/confbase.Y)
AC_CONFIG_AUX_DIR(tools)

AC_ARG_ENABLE(debug,	[  --enable-debug          enable internal debugging routines (default: disabled)],,enable_debug=no)
AC_ARG_ENABLE(memcheck,	[  --enable-memcheck       check memory allocations when debugging (default: enabled)],,enable_memcheck=yes)
AC_ARG_ENABLE(client,	[  --enable-client         enable building of BIRD client (default: enabled)],,enable_client=yes)
AC_ARG_ENABLE(pthreads,	[  --enable-pthreads       enable POSIX threads support (default: detect)],,enable_pthreads=try)
AC_ARG_WITH(sysconfig,	[  --with-sysconfig=FILE   use specified BIRD system configuration file])
AC_ARG_WITH(protocols,	[  --with-protocols=LIST   include specified routing protocols (default: all)],,[with_protocols="all"])
AC_ARG_WITH(sysinclude,	[  --with-sysinclude=PATH  search for system includes on specified place])
AC_ARG_WITH(runtimedir,	[  --with-runtimedir=PATH  path for runtime files (default: $(localstatedir)/run)],[runtimedir="$with_runtimedir"],[runtimedir="\$(localstatedir)/run"])
AC_ARG_WITH(iproutedir,	[  --with-iproutedir=PATH  path to iproute2 config files (default: /etc/iproute2)],[given_iproutedir="yes"])
AC_ARG_VAR([FLEX], [location of the Flex program])
AC_ARG_VAR([BISON], [location of the Bison program])
AC_ARG_VAR([M4], [location of the M4 program])


if test "$srcdir" = . ; then
	# Building in current directory => create obj directory holding all objects
	objdir=obj
	mkdir -p obj
	srcdir_rel=..
	makefiles="Makefile:tools/Makefile-top.in obj/Makefile:tools/Makefile.in obj/Rules:tools/Rules.in"
	exedir=..
else
	# Building in separate directory
	objdir=.
	srcdir_rel=$srcdir
	makefiles="Makefile:tools/Makefile.in Rules:tools/Rules.in"
	exedir=.
fi
case $srcdir_rel in
	/*)	srcdir_rel_mf=$srcdir_rel ;;
	*)	srcdir_rel_mf="\$(root-rel)$srcdir_rel" ;;
esac
AC_SUBST(objdir)
AC_SUBST(exedir)
AC_SUBST(srcdir_rel_mf)
AC_SUBST(runtimedir)


if test "$enable_debug" = yes ; then
	CONFIG_FILE="bird.conf"
	CONTROL_SOCKET="bird.ctl"
else
	CONFIG_FILE="\$(sysconfdir)/bird.conf"
	CONTROL_SOCKET="$runtimedir/bird.ctl"
fi
AC_SUBST(CONFIG_FILE)
AC_SUBST(CONTROL_SOCKET)

AC_SEARCH_LIBS(clock_gettime, [c rt posix4], ,
	AC_MSG_ERROR([[Function clock_gettime not available.]]))

AC_CANONICAL_HOST

# Store this value because ac_test_CFLAGS is overwritten by AC_PROG_CC
if test "$ac_test_CFLAGS" != set ; then
	bird_cflags_default=yes
fi

AC_PROG_CC
if test -z "$GCC" ; then
	AC_MSG_ERROR([This program requires the GNU C Compiler.])
fi

# Enable threads by default just in Linux and FreeBSD
if test "$enable_pthreads" = try ; then
	case "$host_os" in
		(linux* | freebsd*)	enable_pthreads=try ;;
		(*)			enable_pthreads=no ;;
	esac
fi

if test "$enable_pthreads" != no ; then
	BIRD_CHECK_PTHREADS

	if test "$bird_cv_lib_pthreads" = yes ; then
		AC_DEFINE(USE_PTHREADS)
		CFLAGS="$CFLAGS -pthread"
		LDFLAGS="$LDFLAGS -pthread"
		proto_bfd=bfd
	elif test "$enable_pthreads" = yes ; then
		AC_MSG_ERROR([POSIX threads not available.])
	fi

	if test "$enable_pthreads" = try ; then
		enable_pthreads="$bird_cv_lib_pthreads"
	fi
fi

if test "$bird_cflags_default" = yes ; then
	BIRD_CHECK_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign, -Wall)
	BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing)
	BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow)

	CFLAGS="$CFLAGS -Wall -Wstrict-prototypes -Wno-parentheses"
	BIRD_ADD_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign)
	BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing)
	BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow)
fi
AC_MSG_CHECKING([CFLAGS])
AC_MSG_RESULT($CFLAGS)


AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_RANLIB
AC_CHECK_PROG(FLEX, flex, flex)
AC_CHECK_PROG(BISON, bison, bison)
AC_CHECK_PROGS(M4, gm4 m4)

test -z "$FLEX"	 && AC_MSG_ERROR([Flex is missing.])
test -z "$BISON" && AC_MSG_ERROR([Bison is missing.])
test -z "$M4"	 && AC_MSG_ERROR([M4 is missing.])
BIRD_CHECK_PROG_FLAVOR_GNU([$M4], , [AC_MSG_ERROR([Provided M4 is not GNU M4.])])

if test -n "$with_sysconfig" -a "$with_sysconfig" != no ; then
	if test -f $with_sysconfig ; then
		sysdesc=$with_sysconfig
	else
		sysdesc=$srcdir/sysdep/cf/$with_sysconfig
		if ! test -f $sysdesc ; then
			sysdesc=$sysdesc.h
		fi
	fi
elif test -f sysconfig.h ; then
	sysdesc=sysconfig
else
	case "$host_os" in
		linux*)		sysdesc=linux
				default_iproutedir="/etc/iproute2"
				;;
		freebsd*)	sysdesc=bsd
				;;
		kfreebsd*)	sysdesc=bsd
				;;
		netbsd*)	sysdesc=bsd
				CPPFLAGS="$CPPFLAGS -I/usr/pkg/include"
				LDFLAGS="$LDFLAGS -L/usr/pkg/lib -R/usr/pkg/lib"
				;;
		openbsd*)	sysdesc=bsd
				;;
		dragonfly*)	sysdesc=bsd
				;;
		*)		AC_MSG_ERROR([Cannot determine correct system configuration. Please use --with-sysconfig to set it manually.])
				;;
		esac
	sysdesc=$srcdir/sysdep/cf/$sysdesc.h
fi
AC_MSG_CHECKING([which OS configuration should we use])
AC_MSG_RESULT($sysdesc)
if ! test -f $sysdesc ; then
	AC_MSG_ERROR([The system configuration file is missing.])
fi
sysname=`echo $sysdesc | sed 's/\.h$//'`
AC_DEFINE_UNQUOTED(SYSCONF_INCLUDE, "$sysdesc")

AC_MSG_CHECKING([system-dependent directories])
sysdep_dirs="`sed <$sysdesc '/^Link: /!d;s/^Link: \(.*\)$/\1/' | tr '\012' ' '` lib"
AC_MSG_RESULT($sysdep_dirs)
AC_SUBST(sysdep_dirs)

if test "$with_iproutedir" = no ; then with_iproutedir= ; fi

if test -n "$given_iproutedir"
then iproutedir=$with_iproutedir
else iproutedir=$default_iproutedir
fi

AC_SUBST(iproutedir)

# all_protocols="$proto_bfd bgp ospf pipe radv rip static"
all_protocols="pipe radv rip static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'`

if test "$with_protocols" = all ; then
	with_protocols="$all_protocols"
fi

AC_MSG_CHECKING([protocols])
protocols=`echo "$with_protocols" | sed 's/,/ /g'`
if test "$protocols" = no ; then protocols= ; fi
for a in $protocols ; do
	if ! test -f $srcdir/proto/$a/Makefile ; then
		AC_MSG_RESULT(failed)
		AC_MSG_ERROR([Requested protocol $a not found.])
		fi
	AC_DEFINE_UNQUOTED(CONFIG_`echo $a | tr 'a-z' 'A-Z'`)
	done
AC_MSG_RESULT(ok)
AC_SUBST(protocols)

case $sysdesc in
	*/linux*|*/linux-v6*)
		AC_CHECK_HEADER(linux/rtnetlink.h,,[AC_MSG_ERROR([Appropriate version of Linux kernel headers not found.])],[
#include <asm/types.h>
#include <sys/socket.h>
])
		;;
esac

AC_CHECK_HEADER(syslog.h, [AC_DEFINE(HAVE_SYSLOG)])
AC_CHECK_HEADER(alloca.h, [AC_DEFINE(HAVE_ALLOCA_H)])
AC_MSG_CHECKING(whether 'struct sockaddr' has sa_len)
AC_TRY_COMPILE([#include <sys/types.h>
  #include <sys/socket.h>
  ], [static struct sockaddr sa; int i = sizeof(sa.sa_len);],
  [AC_MSG_RESULT(yes)
  AC_DEFINE(HAVE_SIN_LEN,,sin_len)],
  AC_MSG_RESULT(no))

AC_C_BIGENDIAN([AC_DEFINE(CPU_BIG_ENDIAN)], [AC_DEFINE(CPU_LITTLE_ENDIAN)],
		 [AC_MSG_ERROR([Cannot determine CPU endianity.])])

BIRD_CHECK_INTEGERS
BIRD_CHECK_STRUCT_ALIGN
BIRD_CHECK_TIME_T
BIRD_CHECK_STRUCT_IP_MREQN

if test "$enable_debug" = yes ; then
	AC_DEFINE(DEBUGGING)
	if test "$enable_memcheck" = yes ; then
		AC_CHECK_LIB(dmalloc, dmalloc_debug)
		if test $ac_cv_lib_dmalloc_dmalloc_debug != yes ; then
			AC_CHECK_LIB(efence, malloc)
		fi
	fi
fi

CLIENT=
CLIENT_LIBS=
if test "$enable_client" = yes ; then
	CLIENT=birdc
	AC_CHECK_LIB(history, add_history, CLIENT_LIBS="-lhistory")
	AC_CHECK_LIB(ncurses, tgetent, USE_TERMCAP_LIB=-lncurses,
		AC_CHECK_LIB(curses, tgetent, USE_TERMCAP_LIB=-lcurses,
			AC_CHECK_LIB(tinfow, tgetent, USE_TERMCAP_LIB=-ltinfow,
				AC_CHECK_LIB(tinfo, tgetent, USE_TERMCAP_LIB=-ltinfo,
					AC_CHECK_LIB(termcap, tgetent, USE_TERMCAP_LIB=-ltermcap,
						AC_MSG_ERROR([[The client requires ncurses library. Either install the library or use --disable-client to compile without the client.]]))))))
	AC_CHECK_LIB(readline, rl_callback_read_char, CLIENT_LIBS="-lreadline $CLIENT_LIBS $USE_TERMCAP_LIB",
		AC_MSG_ERROR([[The client requires GNU readline library 2.1 or newer. Either install the library or use --disable-client to compile without the client.]]), $USE_TERMCAP_LIB)
	AC_CHECK_LIB(readline, rl_crlf, AC_DEFINE(HAVE_RL_CRLF),,$USE_TERMCAP_LIB)
	AC_CHECK_LIB(readline, rl_ding, AC_DEFINE(HAVE_RL_DING),,$USE_TERMCAP_LIB)
fi
AC_SUBST(CLIENT)
AC_SUBST(CLIENT_LIBS)

mkdir -p $objdir/sysdep
AC_CONFIG_HEADERS([$objdir/sysdep/autoconf.h:sysdep/autoconf.h.in])
AC_CONFIG_COMMANDS([merge],[[export CPP="$CPP"
$srcdir/tools/mergedirs $srcdir $srcdir_rel $objdir $sysdep_dirs]],
	[[srcdir=$srcdir]
	[srcdir_rel=$srcdir_rel]
	[objdir=$objdir]
	[sysdep_dirs="$sysdep_dirs"]])
AC_CONFIG_FILES($makefiles)
AC_OUTPUT

rm -f $objdir/sysdep/paths.h

cat >&AC_FD_MSG <<EOF

BIRD was configured with the following options:
	Source directory:	$srcdir
	Object directory:	$objdir
	Iproute2 directory:	$iproutedir
	System configuration:	$sysdesc
	Debugging:		$enable_debug
	POSIX threads:		$enable_pthreads
	Routing protocols:	$protocols
	Client:			$enable_client
EOF
rm -f $objdir/.*-stamp