Added --enable-ipv6 which tells configure to select the right configuration

for IPv6 automatically.

Added --enable-warnings which turns off some more warnings.

Default protocol list now depends on --enable-ipv6.

configure.in

@@ -7,9 +7,11 @@ AC_INIT(conf/confbase.Y)
 AC_CONFIG_AUX_DIR(tools)
 
 AC_ARG_ENABLE(debug,[  --enable-debug          enable internal debugging routines (default: enabled)],,enable_debug=yes)
+AC_ARG_ENABLE(warnings,[  --enable-warnings       enable extra warnings (default: disabled)],,enable_warnings=no)
 AC_ARG_ENABLE(client,[  --enable-client         enable building of BIRD client (default: enabled)],,enable_client=yes)
+AC_ARG_ENABLE(ipv6,[  --enable-ipv6           enable building of IPv6 version (default: disabled)],,enable_ipv6=no)
 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: rip,static,pipe,bgp,ospf)],,[with_protocols="rip,static,pipe,bgp,ospf"])
+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])
 
 if test "$srcdir" = . ; then
@@ -34,6 +36,18 @@ AC_SUBST(objdir)
 AC_SUBST(exedir)
 AC_SUBST(srcdir_rel_mf)
 
+if test "$enable_ipv6" = yes ; then
+	ip=ipv6
+	if test "$with_protocols" = all ; then
+		with_protocols=bgp,pipe,rip,static
+	fi
+else
+	ip=ipv4
+	if test "$with_protocols" = all ; then
+		with_protocols=bgp,ospf,pipe,rip,static
+	fi
+fi
+
 AC_CANONICAL_HOST
 AC_MSG_CHECKING([which OS configuration should we use])
 if test -n "$with_sysconfig" -a "$with_sysconfig" != no ; then
@@ -48,12 +62,14 @@ if test -n "$with_sysconfig" -a "$with_sysconfig" != no ; then
 elif test -f sysconfig.h ; then
 	sysdesc=sysconfig
 else
-	case "$host_os" in
-		linux*)		case `uname -r` in
+	case "$ip:$host_os" in
+		ipv4:linux*)	case `uname -r` in
 					1.*|2.0.*)	sysdesc=linux-20 ;;
 					*)		sysdesc=linux-22 ;;
 					esac
 				;;
+		ipv6:linux*)	sysdesc=linux-v6
+				;;
 		*)		AC_MSG_RESULT(unknown)
 				AC_MSG_ERROR([Cannot determine correct system configuration.])
 				;;
@@ -91,7 +107,12 @@ if test -z "$GCC" ; then
 	fi
 AC_MSG_CHECKING([what CFLAGS should we use])
 if test "$ac_test_CFLAGS" != set ; then
-	CFLAGS="$CFLAGS -Wall -W -Wstrict-prototypes -Wno-unused -Wno-parentheses"
+	if test "$enable_warnings" = yes ; then
+		WARNS=""
+	else
+		WARNS=" -Wno-unused"
+	fi
+	CFLAGS="$CFLAGS -Wall -W -Wstrict-prototypes -Wno-parentheses$WARNS"
 fi
 if test "$with_sysinclude" != no -a -n "$with_sysinclude"; then
 	CPPFLAGS="$CPPFLAGS -I$with_sysinclude"
@@ -109,8 +130,9 @@ if test -z "$FLEX" -o -z "$BISON" -o -z "$M4" ; then
 	fi
 
 case $sysdesc in
-	*/linux-22*)	AC_CHECK_HEADER(linux/rtnetlink.h,,[AC_MSG_ERROR([Appropriate version of Linux kernel headers not found.])])
-			;;
+	*/linux-22*|*/linux-v6*)
+		AC_CHECK_HEADER(linux/rtnetlink.h,,[AC_MSG_ERROR([Appropriate version of Linux kernel headers not found.])])
+		;;
 esac
 
 AC_CHECK_HEADER(syslog.h, [AC_DEFINE(HAVE_SYSLOG)])