acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at:
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 dnl OVS_ENABLE_WERROR
  18 AC_DEFUN([OVS_ENABLE_WERROR],
  19   [AC_ARG_ENABLE(
  20      [Werror],
  21      [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
  22      [], [enable_Werror=no])
  23    AC_CONFIG_COMMANDS_PRE(
  24      [if test "X$enable_Werror" = Xyes; then
  25         OVS_CFLAGS="$OVS_CFLAGS -Werror"
  26       fi])])
  27
  28 dnl OVS_CHECK_LINUX
  29 dnl
  30 dnl Configure linux kernel source tree
  31 AC_DEFUN([OVS_CHECK_LINUX], [
  32   AC_ARG_WITH([linux],
  33               [AC_HELP_STRING([--with-linux=/path/to/linux],
  34                               [Specify the Linux kernel build directory])])
  35   AC_ARG_WITH([linux-source],
  36               [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
  37                               [Specify the Linux kernel source directory
  38                                (usually figured out automatically from build
  39                                directory)])])
  40
  41   # Deprecated equivalents to --with-linux, --with-linux-source.
  42   AC_ARG_WITH([l26])
  43   AC_ARG_WITH([l26-source])
  44
  45   if test X"$with_linux" != X; then
  46     KBUILD=$with_linux
  47   elif test X"$with_l26" != X; then
  48     KBUILD=$with_l26
  49     AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  50   else
  51     KBUILD=
  52   fi
  53
  54   if test X"$KBUILD" != X; then
  55     if test X"$with_linux_source" != X; then
  56       KSRC=$with_linux_source
  57     elif test X"$with_l26_source" != X; then
  58       KSRC=$with_l26_source
  59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
  60     else
  61       KSRC=
  62     fi
  63   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
  64     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  65   fi
  66
  67   if test -n "$KBUILD"; then
  68     KBUILD=`eval echo "$KBUILD"`
  69     case $KBUILD in
  70         /*) ;;
  71         *) KBUILD=`pwd`/$KBUILD ;;
  72     esac
  73
  74     # The build directory is what the user provided.
  75     # Make sure that it exists.
  76     AC_MSG_CHECKING([for Linux build directory])
  77     if test -d "$KBUILD"; then
  78         AC_MSG_RESULT([$KBUILD])
  79         AC_SUBST(KBUILD)
  80     else
  81         AC_MSG_RESULT([no])
  82         AC_ERROR([source dir $KBUILD doesn't exist])
  83     fi
  84
  85     # Debian breaks kernel headers into "source" header and "build" headers.
  86     # We want the source headers, but $KBUILD gives us the "build" headers.
  87     # Use heuristics to find the source headers.
  88     AC_MSG_CHECKING([for Linux source directory])
  89     if test -n "$KSRC"; then
  90       KSRC=`eval echo "$KSRC"`
  91       case $KSRC in
  92           /*) ;;
  93           *) KSRC=`pwd`/$KSRC ;;
  94       esac
  95       if test ! -e $KSRC/include/linux/kernel.h; then
  96         AC_MSG_ERROR([$KSRC is not a kernel source directory])
  97       fi
  98     else
  99       KSRC=$KBUILD
 100       if test ! -e $KSRC/include/linux/kernel.h; then
 101         # Debian kernel build Makefiles tend to include a line of the form:
 102         # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
 103         # First try to extract the source directory from this line.
 104         KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
 105         if test ! -e "$KSRC"/include/linux/kernel.h; then
 106           # Didn't work.  Fall back to name-based heuristics that used to work.
 107           case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 108             */build)
 109               KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 110               ;; # (
 111             *)
 112               KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 113               ;;
 114           esac
 115         fi
 116       fi
 117       if test ! -e "$KSRC"/include/linux/kernel.h; then
 118         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 119       fi
 120     fi
 121     AC_MSG_RESULT([$KSRC])
 122
 123     AC_MSG_CHECKING([for kernel version])
 124     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 125     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 126     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 127     if test X"$version" = X || test X"$patchlevel" = X; then
 128        AC_ERROR([cannot determine kernel version])
 129     elif test X"$sublevel" = X; then
 130        kversion=$version.$patchlevel
 131     else
 132        kversion=$version.$patchlevel.$sublevel
 133     fi
 134     AC_MSG_RESULT([$kversion])
 135
 136     if test "$version" -ge 3; then
 137        if test "$version" = 3 && test "$patchlevel" -le 19; then
 138           : # Linux 3.x
 139        else
 140          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.19.x is not supported (please refer to the FAQ for advice)])
 141        fi
 142     else
 143        if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
 144          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
 145        else
 146          : # Linux 2.6.x
 147        fi
 148     fi
 149     if (test ! -e "$KBUILD"/include/linux/version.h && \
 150         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 151        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 152         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 153         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 154     fi
 155     OVS_CHECK_LINUX_COMPAT
 156   fi
 157   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 158 ])
 159
 160 dnl OVS_CHECK_DPDK
 161 dnl
 162 dnl Configure DPDK source tree
 163 AC_DEFUN([OVS_CHECK_DPDK], [
 164   AC_ARG_WITH([dpdk],
 165               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 166                               [Specify the DPDK build directory])])
 167
 168   if test X"$with_dpdk" != X; then
 169     RTE_SDK=$with_dpdk
 170
 171     DPDK_INCLUDE=$RTE_SDK/include
 172     DPDK_LIB_DIR=$RTE_SDK/lib
 173     DPDK_LIB=-lintel_dpdk
 174
 175     ovs_save_CFLAGS="$CFLAGS"
 176     ovs_save_LDFLAGS="$LDFLAGS"
 177     LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
 178     CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
 179
 180     # On some systems we have to add -ldl to link with dpdk
 181     #
 182     # This code, at first, tries to link without -ldl (""),
 183     # then adds it and tries again.
 184     # Before each attempt the search cache must be unset,
 185     # otherwise autoconf will stick with the old result
 186
 187     found=false
 188     save_LIBS=$LIBS
 189     for extras in "" "-ldl"; do
 190         LIBS="$DPDK_LIB $extras $save_LIBS"
 191         AC_LINK_IFELSE(
 192            [AC_LANG_PROGRAM([#include <rte_config.h>
 193                              #include <rte_eal.h>],
 194                             [int rte_argc; char ** rte_argv;
 195                              rte_eal_init(rte_argc, rte_argv);])],
 196            [found=true])
 197         if $found; then
 198             break
 199         fi
 200     done
 201     if $found; then :; else
 202         AC_MSG_ERROR([cannot link with dpdk])
 203     fi
 204     CFLAGS="$ovs_save_CFLAGS"
 205     LDFLAGS="$ovs_save_LDFLAGS"
 206     OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 207     OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
 208
 209     # DPDK 1.7 pmd drivers are not linked unless --whole-archive is used.
 210     #
 211     # This happens because the rest of the DPDK code doesn't use any symbol in
 212     # the pmd driver objects, and the drivers register themselves using an
 213     # __attribute__((constructor)) function.
 214     #
 215     # These options are specified inside a single -Wl directive to prevent
 216     # autotools from reordering them.
 217     DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 218     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 219     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 220   else
 221     RTE_SDK=
 222   fi
 223
 224   AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
 225 ])
 226
 227 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 228 dnl
 229 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 230 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 231 dnl <REGEX> translated to uppercase.
 232 AC_DEFUN([OVS_GREP_IFELSE], [
 233   AC_MSG_CHECKING([whether $2 matches in $1])
 234   if test -f $1; then
 235     grep '$2' $1 >/dev/null 2>&1
 236     status=$?
 237     case $status in
 238       0)
 239         AC_MSG_RESULT([yes])
 240         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 241         ;;
 242       1)
 243         AC_MSG_RESULT([no])
 244         $4
 245         ;;
 246       *)
 247         AC_MSG_ERROR([grep exited with status $status])
 248         ;;
 249     esac
 250   else
 251     AC_MSG_RESULT([file not found])
 252     $4
 253   fi
 254 ])
 255
 256 dnl OVS_DEFINE(NAME)
 257 dnl
 258 dnl Defines NAME to 1 in kcompat.h.
 259 AC_DEFUN([OVS_DEFINE], [
 260   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 261 ])
 262
 263 AC_DEFUN([OVS_CHECK_LOG2_H], [
 264   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
 265   if test -e $KSRC/include/linux/log2.h; then
 266     AC_MSG_RESULT([yes])
 267     OVS_DEFINE([HAVE_LOG2_H])
 268   else
 269     AC_MSG_RESULT([no])
 270   fi
 271 ])
 272
 273 dnl OVS_CHECK_LINUX_COMPAT
 274 dnl
 275 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 276 dnl the directory in $KBUILD.
 277 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 278   rm -f datapath/linux/kcompat.h.new
 279   mkdir -p datapath/linux
 280   : > datapath/linux/kcompat.h.new
 281
 282   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 283                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 284
 285   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 286   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 287
 288   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 289   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 290
 291   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 292
 293   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 294   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 295                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 296
 297   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 298   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 299   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 300   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 301   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 302   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 303   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
 304
 305   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 306
 307   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 308                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 309                                    [rcu_read_lock_held])])
 310   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 311
 312   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 313   # is necessary because some versions of this header remove the
 314   # member but retain the kerneldoc comment that describes it (which
 315   # starts with @).  The brackets must be doubled because of m4
 316   # quoting rules.
 317   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 318                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 319   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 320   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 321                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 322   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 323                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 324   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 325                   [skb_copy_from_linear_data_offset])
 326   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 327                   [skb_reset_tail_pointer])
 328   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 329   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 330                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 331   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 332                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 333   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 334                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 335   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 336   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 337   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 338   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 339   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 340   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 341   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 342   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
 343   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 344   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 345                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 346   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
 347   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 348   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 349   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 350
 351   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 352                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 353   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 354                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 355   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 356                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 357
 358   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 359   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 360
 361   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 362   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 363   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 364   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
 365   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 366                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 367   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 368   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 369   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 370   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 371   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 372   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 373   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 374   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 375   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 376
 377   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 378
 379   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 380                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 381   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 382   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 383
 384
 385   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 386
 387   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
 388                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 389   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 390                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 391   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 392                   [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])
 393   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
 394                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 395   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 396                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 397
 398   OVS_CHECK_LOG2_H
 399
 400   if cmp -s datapath/linux/kcompat.h.new \
 401             datapath/linux/kcompat.h >/dev/null 2>&1; then
 402     rm datapath/linux/kcompat.h.new
 403   else
 404     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 405   fi
 406 ])
 407
 408 dnl Checks for net/if_packet.h.
 409 AC_DEFUN([OVS_CHECK_IF_PACKET],
 410   [AC_CHECK_HEADER([net/if_packet.h],
 411                    [HAVE_IF_PACKET=yes],
 412                    [HAVE_IF_PACKET=no])
 413    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 414    if test "$HAVE_IF_PACKET" = yes; then
 415       AC_DEFINE([HAVE_IF_PACKET], [1],
 416                 [Define to 1 if net/if_packet.h is available.])
 417    fi])
 418
 419 dnl Checks for net/if_dl.h.
 420 dnl
 421 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 422 dnl or NetBSD.)
 423 AC_DEFUN([OVS_CHECK_IF_DL],
 424   [AC_CHECK_HEADER([net/if_dl.h],
 425                    [HAVE_IF_DL=yes],
 426                    [HAVE_IF_DL=no])
 427    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 428    if test "$HAVE_IF_DL" = yes; then
 429       AC_DEFINE([HAVE_IF_DL], [1],
 430                 [Define to 1 if net/if_dl.h is available.])
 431
 432       # On these platforms we use libpcap to access network devices.
 433       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 434    fi])
 435
 436 dnl Checks for buggy strtok_r.
 437 dnl
 438 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 439 dnl with optimization that can cause segfaults:
 440 dnl
 441 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 442 AC_DEFUN([OVS_CHECK_STRTOK_R],
 443   [AC_CACHE_CHECK(
 444      [whether strtok_r macro segfaults on some inputs],
 445      [ovs_cv_strtok_r_bug],
 446      [AC_RUN_IFELSE(
 447         [AC_LANG_PROGRAM([#include <stdio.h>
 448                           #include <string.h>
 449                          ],
 450                          [[char string[] = ":::";
 451                            char *save_ptr = (char *) 0xc0ffee;
 452                            char *token1, *token2;
 453                            token1 = strtok_r(string, ":", &save_ptr);
 454                            token2 = strtok_r(NULL, ":", &save_ptr);
 455                            freopen ("/dev/null", "w", stdout);
 456                            printf ("%s %s\n", token1, token2);
 457                            return 0;
 458                           ]])],
 459         [ovs_cv_strtok_r_bug=no],
 460         [ovs_cv_strtok_r_bug=yes],
 461         [ovs_cv_strtok_r_bug=yes])])
 462    if test $ovs_cv_strtok_r_bug = yes; then
 463      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 464                [Define if strtok_r macro segfaults on some inputs])
 465    fi
 466 ])
 467
 468 dnl ----------------------------------------------------------------------
 469 dnl These macros are from GNU PSPP, with the following original license:
 470 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 471 dnl This file is free software; the Free Software Foundation
 472 dnl gives unlimited permission to copy and/or distribute it,
 473 dnl with or without modifications, as long as this notice is preserved.
 474
 475 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 476   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
 477   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 478     [ovs_save_CFLAGS="$CFLAGS"
 479      dnl Include -Werror in the compiler options, because without -Werror
 480      dnl clang's GCC-compatible compiler driver does not return a failure
 481      dnl exit status even though it complains about options it does not
 482      dnl understand.
 483      CFLAGS="$CFLAGS $WERROR $1"
 484      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 485      CFLAGS="$ovs_save_CFLAGS"])
 486   if test $ovs_cv_name = yes; then
 487     m4_if([$2], [], [:], [$2])
 488   else
 489     m4_if([$3], [], [:], [$3])
 490   fi
 491 ])
 492
 493 dnl OVS_CHECK_WERROR
 494 dnl
 495 dnl Check whether the C compiler accepts -Werror.
 496 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 497 AC_DEFUN([OVS_CHECK_WERROR],
 498   [WERROR=
 499    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 500
 501 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 502 dnl Check whether the given C compiler OPTION is accepted.
 503 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 504 AC_DEFUN([OVS_CHECK_CC_OPTION],
 505   [AC_REQUIRE([OVS_CHECK_WERROR])
 506    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 507
 508 dnl OVS_ENABLE_OPTION([OPTION])
 509 dnl Check whether the given C compiler OPTION is accepted.
 510 dnl If so, add it to WARNING_FLAGS.
 511 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 512 AC_DEFUN([OVS_ENABLE_OPTION],
 513   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 514    AC_SUBST([WARNING_FLAGS])])
 515
 516 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 517 dnl Check whether the given C compiler OPTION is accepted.
 518 dnl If so, enable the given Automake CONDITIONAL.
 519
 520 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 521 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 522   [OVS_CHECK_CC_OPTION(
 523     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 524    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 525 dnl ----------------------------------------------------------------------
 526
 527 dnl Check for too-old XenServer.
 528 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 529   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 530     [if test -e /etc/redhat-release; then
 531        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 532      fi
 533      if test -z "$ovs_cv_xsversion"; then
 534        ovs_cv_xsversion=none
 535      fi])
 536   case $ovs_cv_xsversion in
 537     none)
 538       ;;
 539
 540     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 541     [[6-9]]* |                           dnl XenServer 6 or later
 542     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 543     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 544     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 545     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 546       ;;
 547
 548     *)
 549       AC_MSG_ERROR([This appears to be XenServer $ovs_cv_xsversion, but only XenServer 5.6.100 or later is supported.  (If you are really using a supported version of XenServer, you may override this error message by specifying 'ovs_cv_xsversion=5.6.100' on the "configure" command line.)])
 550       ;;
 551   esac])
 552
 553 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 554 dnl
 555 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 556 dnl Runs 'if-true' if so, 'if-false' otherwise.
 557 AC_DEFUN([OVS_CHECK_MAKE_IF],
 558   [AC_CACHE_CHECK(
 559      [whether ${MAKE-make} has GNU make \$(if) extension],
 560      [ovs_cv_gnu_make_if],
 561      [cat <<'EOF' > conftest.mk
 562 conftest.out:
 563         echo $(if x,y,z) > conftest.out
 564 .PHONY: all
 565 EOF
 566       rm -f conftest.out
 567       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 568       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 569       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 570       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 571       result=`cat conftest.out`
 572       rm -f conftest.mk conftest.out
 573       if test "X$result" = "Xy"; then
 574         ovs_cv_gnu_make_if=yes
 575       else
 576         ovs_cv_gnu_make_if=no
 577       fi])])
 578
 579 dnl OVS_CHECK_GNU_MAKE
 580 dnl
 581 dnl Checks whether make is GNU make (because Linux kernel Makefiles
 582 dnl only work with GNU make).
 583 AC_DEFUN([OVS_CHECK_GNU_MAKE],
 584   [AC_CACHE_CHECK(
 585      [whether ${MAKE-make} is GNU make],
 586      [ovs_cv_gnu_make],
 587      [rm -f conftest.out
 588       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
 589       ${MAKE-make} --version >conftest.out 2>&1
 590       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 591       result=`cat conftest.out`
 592       rm -f conftest.mk conftest.out
 593
 594       case $result in # (
 595         GNU*) ovs_cv_gnu_make=yes ;; # (
 596         *) ovs_cv_gnu_make=no ;;
 597       esac])
 598    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
 599
 600 dnl OVS_CHECK_SPARSE_TARGET
 601 dnl
 602 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 603 dnl target for which the code is being built.  This helps it out.
 604 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 605   [AC_CACHE_CHECK(
 606     [target hint for cgcc],
 607     [ac_cv_sparse_target],
 608     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 609        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 610        [x86_64-*], [ac_cv_sparse_target=x86_64],
 611        [ac_cv_sparse_target=other])])
 612    AS_CASE([$ac_cv_sparse_target],
 613      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 614      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 615      [SPARSEFLAGS= CGCCFLAGS=])
 616    AC_SUBST([SPARSEFLAGS])
 617    AC_SUBST([CGCCFLAGS])])
 618
 619 dnl OVS_SPARSE_EXTRA_INCLUDES
 620 dnl
 621 dnl The cgcc script from "sparse" does not search gcc's default
 622 dnl search path. Get the default search path from GCC and pass
 623 dnl them to sparse.
 624 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 625     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 626            [`$CC -v -E - </dev/null 2>&1 >/dev/null | sed -n -e '/^#include.*search.*starts.*here:/,/^End.*of.*search.*list\./s/^ \(.*\)/-I \1/p' |grep -v /usr/lib | grep -x -v '\-I /usr/include' | tr \\\n ' ' `] ))
 627
 628 dnl OVS_ENABLE_SPARSE
 629 AC_DEFUN([OVS_ENABLE_SPARSE],
 630   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 631    AC_REQUIRE([OVS_CHECK_MAKE_IF])
 632    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 633    : ${SPARSE=sparse}
 634    AC_SUBST([SPARSE])
 635    AC_CONFIG_COMMANDS_PRE(
 636      [if test $ovs_cv_gnu_make_if = yes; then
 637         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
 638       fi])])
 639
 640 dnl OVS_PTHREAD_SET_NAME
 641 dnl
 642 dnl This checks for three known variants of pthreads functions for setting
 643 dnl the name of the current thread:
 644 dnl
 645 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 646 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 647 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 648 dnl
 649 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 650 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 651 dnl provide to it.
 652 dnl
 653 dnl This macro defines:
 654 dnl
 655 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 656 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 657 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 658 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 659   [AC_CHECK_FUNCS([pthread_set_name_np])
 660    if test $ac_cv_func_pthread_set_name_np != yes; then
 661      AC_CACHE_CHECK(
 662        [for pthread_setname_np() variant],
 663        [ovs_cv_pthread_setname_np],
 664        [AC_LINK_IFELSE(
 665          [AC_LANG_PROGRAM([#include <pthread.h>
 666   ], [pthread_setname_np(pthread_self(), "name");])],
 667          [ovs_cv_pthread_setname_np=glibc],
 668          [AC_LINK_IFELSE(
 669            [AC_LANG_PROGRAM([#include <pthread.h>
 670 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 671            [ovs_cv_pthread_setname_np=netbsd],
 672            [ovs_cv_pthread_setname_np=none])])])
 673      case $ovs_cv_pthread_setname_np in # (
 674        glibc)
 675           AC_DEFINE(
 676             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 677             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 678           ;; # (
 679        netbsd)
 680           AC_DEFINE(
 681             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 682             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 683           ;;
 684      esac
 685    fi])
 686
 687 dnl OVS_CHECK_LINUX_HOST.
 688 dnl
 689 dnl Checks whether we're building for a Linux host, based on the presence of
 690 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
 691 dnl LINUX based on the result.
 692 AC_DEFUN([OVS_CHECK_LINUX_HOST],
 693   [AC_CACHE_CHECK(
 694      [whether __linux__ is defined],
 695      [ovs_cv_linux],
 696      [AC_COMPILE_IFELSE(
 697         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
 698         [ovs_cv_linux=true],
 699         [ovs_cv_linux=false])])
 700    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])