acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 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 "$version" -ge 4; then
 137        if test "$version" = 4 && test "$patchlevel" -le 3; then
 138           : # Linux 4.x
 139        else
 140           AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.3.x is not supported (please refer to the FAQ for advice)])
 141        fi
 142     elif test "$version" = 3; then
 143        : # Linux 3.x
 144     else
 145        if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
 146          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
 147        else
 148          : # Linux 2.6.x
 149        fi
 150     fi
 151     if (test ! -e "$KBUILD"/include/linux/version.h && \
 152         test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
 153        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 154         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 155         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 156     fi
 157     OVS_CHECK_LINUX_COMPAT
 158   fi
 159   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 160 ])
 161
 162 dnl OVS_CHECK_DPDK
 163 dnl
 164 dnl Configure DPDK source tree
 165 AC_DEFUN([OVS_CHECK_DPDK], [
 166   AC_ARG_WITH([dpdk],
 167               [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
 168                               [Specify the DPDK build directory])])
 169
 170   if test X"$with_dpdk" != X; then
 171     RTE_SDK=$with_dpdk
 172
 173     DPDK_INCLUDE=$RTE_SDK/include
 174     DPDK_LIB_DIR=$RTE_SDK/lib
 175     DPDK_LIB="-ldpdk"
 176     DPDK_EXTRA_LIB=""
 177     RTE_SDK_FULL=`readlink -f $RTE_SDK`
 178
 179     AC_COMPILE_IFELSE(
 180       [AC_LANG_PROGRAM([#include <$RTE_SDK_FULL/include/rte_config.h>
 181 #if !RTE_LIBRTE_VHOST_USER
 182 #error
 183 #endif], [])],
 184                     [], [AC_DEFINE([VHOST_CUSE], [1], [DPDK vhost-cuse support enabled, vhost-user disabled.])
 185                          DPDK_EXTRA_LIB="-lfuse"])
 186
 187     ovs_save_CFLAGS="$CFLAGS"
 188     ovs_save_LDFLAGS="$LDFLAGS"
 189     LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
 190     CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
 191
 192     # On some systems we have to add -ldl to link with dpdk
 193     #
 194     # This code, at first, tries to link without -ldl (""),
 195     # then adds it and tries again.
 196     # Before each attempt the search cache must be unset,
 197     # otherwise autoconf will stick with the old result
 198
 199     found=false
 200     save_LIBS=$LIBS
 201     for extras in "" "-ldl"; do
 202         LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
 203         AC_LINK_IFELSE(
 204            [AC_LANG_PROGRAM([#include <rte_config.h>
 205                              #include <rte_eal.h>],
 206                             [int rte_argc; char ** rte_argv;
 207                              rte_eal_init(rte_argc, rte_argv);])],
 208            [found=true])
 209         if $found; then
 210             break
 211         fi
 212     done
 213     if $found; then :; else
 214         AC_MSG_ERROR([cannot link with dpdk])
 215     fi
 216     CFLAGS="$ovs_save_CFLAGS"
 217     LDFLAGS="$ovs_save_LDFLAGS"
 218     OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
 219     OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
 220     OVS_ENABLE_OPTION([-mssse3])
 221
 222     # DPDK pmd drivers are not linked unless --whole-archive is used.
 223     #
 224     # This happens because the rest of the DPDK code doesn't use any symbol in
 225     # the pmd driver objects, and the drivers register themselves using an
 226     # __attribute__((constructor)) function.
 227     #
 228     # These options are specified inside a single -Wl directive to prevent
 229     # autotools from reordering them.
 230     DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
 231     AC_SUBST([DPDK_vswitchd_LDFLAGS])
 232     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 233
 234   else
 235     RTE_SDK=
 236   fi
 237
 238   AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
 239 ])
 240
 241 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 242 dnl
 243 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 244 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 245 dnl <REGEX> translated to uppercase.
 246 AC_DEFUN([OVS_GREP_IFELSE], [
 247   AC_MSG_CHECKING([whether $2 matches in $1])
 248   if test -f $1; then
 249     grep '$2' $1 >/dev/null 2>&1
 250     status=$?
 251     case $status in
 252       0)
 253         AC_MSG_RESULT([yes])
 254         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 255         ;;
 256       1)
 257         AC_MSG_RESULT([no])
 258         $4
 259         ;;
 260       *)
 261         AC_MSG_ERROR([grep exited with status $status])
 262         ;;
 263     esac
 264   else
 265     AC_MSG_RESULT([file not found])
 266     $4
 267   fi
 268 ])
 269
 270 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 271 dnl
 272 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
 273 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
 274 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
 275 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
 276 dnl translated to uppercase.
 277 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
 278   AC_MSG_CHECKING([whether $2 has member $3 in $1])
 279   if test -f $1; then
 280     awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
 281     status=$?
 282     case $status in
 283       0)
 284         AC_MSG_RESULT([yes])
 285         m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
 286         ;;
 287       1)
 288         AC_MSG_RESULT([no])
 289         $5
 290         ;;
 291       *)
 292         AC_MSG_ERROR([grep exited with status $status])
 293         ;;
 294     esac
 295   else
 296     AC_MSG_RESULT([file not found])
 297     $5
 298   fi
 299 ])
 300
 301 dnl OVS_DEFINE(NAME)
 302 dnl
 303 dnl Defines NAME to 1 in kcompat.h.
 304 AC_DEFUN([OVS_DEFINE], [
 305   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 306 ])
 307
 308 dnl OVS_CHECK_LINUX_COMPAT
 309 dnl
 310 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 311 dnl the directory in $KBUILD.
 312 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 313   rm -f datapath/linux/kcompat.h.new
 314   mkdir -p datapath/linux
 315   : > datapath/linux/kcompat.h.new
 316
 317   echo '#include <linux/version.h>
 318 #ifndef RHEL_RELEASE_CODE
 319 #define RHEL_RELEASE_CODE 0
 320 #define RHEL_RELEASE_VERSION(a, b) 0
 321 #endif' >> datapath/linux/kcompat.h.new
 322
 323   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 324                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 325
 326   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_dst_lookup.*net],
 327                   [OVS_DEFINE([HAVE_IPV6_DST_LOOKUP_NET])])
 328   OVS_GREP_IFELSE([$KSRC/include/net/addrconf.h], [ipv6_stub])
 329
 330   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 331   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
 332
 333   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 334   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 335
 336   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [IFLA_GENEVE_TOS])
 337   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/if_link.h], [rtnl_link_stats64])
 338   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 339   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 340   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
 341
 342   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 343   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
 344   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 345                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 346   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*net],
 347                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_NET])])
 348
 349   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
 350                   [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
 351   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_do_fragment])
 352   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_is_fragment])
 353   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_skb_dst_mtu])
 354
 355   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [IPSKB_FRAG_PMTU],
 356                   [OVS_DEFINE([HAVE_CORRECT_MRU_HANDLING])])
 357   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [__ip_tunnel_change_mtu])
 358   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [hashfn.*const],
 359                   [OVS_DEFINE([HAVE_INET_FRAGS_CONST])])
 360   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [last_in],
 361                   [OVS_DEFINE([HAVE_INET_FRAGS_LAST_IN])])
 362   OVS_GREP_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_evicting])
 363   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 364                         [frags_work])
 365   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frags],
 366                         [rwlock])
 367   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/inet_frag.h], [inet_frag_queue],
 368                         [list_evictor])
 369   OVS_GREP_IFELSE([$KSRC/include/net/inetpeer.h], [vif],
 370                   [OVS_DEFINE([HAVE_INETPEER_VIF_SUPPORT])])
 371
 372   OVS_GREP_IFELSE([$KSRC/include/net/dst_metadata.h], [metadata_dst])
 373
 374   OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
 375                   [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
 376   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 377   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 378   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 379   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_recursion_level])
 380   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 381   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 382   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [ndo_get_iflink])
 383   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 384   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
 385   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_rx_handler_register])
 386   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_extended])
 387   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [rx_handler_func_t.*pskb],
 388                   [OVS_DEFINE([HAVE_RX_HANDLER_PSKB])])
 389   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netif_needs_gso.*net_device],
 390                   [OVS_DEFINE([HAVE_NETIF_NEEDS_GSO_NETDEV])])
 391   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload])
 392   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [udp_offload.*uoff],
 393                   [OVS_DEFINE([HAVE_UDP_OFFLOAD_ARG_UOFF])])
 394   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [gro_remcsum])
 395
 396   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hook_state])
 397   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_register_net_hook])
 398   OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
 399                   [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
 400   OVS_FIND_FIELD_IFELSE([$KSRC/include/linux/netfilter_ipv6.h], [nf_ipv6_ops],
 401                         [fragment], [OVS_DEFINE([HAVE_NF_IPV6_OPS_FRAGMENT])])
 402
 403   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack.h],
 404                   [tmpl_alloc.*conntrack_zone],
 405                   [OVS_DEFINE([HAVE_NF_CT_TMPL_ALLOC_TAKES_STRUCT_ZONE])])
 406   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_zones.h],
 407                   [nf_ct_zone_init])
 408   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/nf_conntrack_labels.h],
 409                   [nf_connlabels_get])
 410   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 411                   [nf_ct_frag6_consume_orig])
 412   OVS_GREP_IFELSE([$KSRC/include/net/netfilter/ipv6/nf_defrag_ipv6.h],
 413                   [nf_ct_frag6_output])
 414
 415   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 416   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32_max])
 417
 418   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [get_link_net])
 419   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [name_assign_type])
 420   OVS_GREP_IFELSE([$KSRC/include/net/rtnetlink.h], [rtnl_create_link.*src_net],
 421                   [OVS_DEFINE([HAVE_RTNL_CREATE_LINK_SRC_NET])])
 422   OVS_GREP_IFELSE([$KSRC/include/net/net_namespace.h], [possible_net_t])
 423
 424   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 425                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 426                                    [rcu_read_lock_held])])
 427   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 428
 429   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 430   # is necessary because some versions of this header remove the
 431   # member but retain the kerneldoc comment that describes it (which
 432   # starts with @).  The brackets must be doubled because of m4
 433   # quoting rules.
 434   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 435                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 436   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
 437   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_protocol])
 438   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_mac_header])
 439   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [inner_network_header])
 440   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
 441   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_scrub_packet.*xnet],
 442                   [OVS_DEFINE([HAVE_SKB_SCRUB_PACKET_XNET])])
 443   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 444   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 445                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 446   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 447                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 448   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 449                   [skb_copy_from_linear_data_offset])
 450   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 451                   [skb_reset_tail_pointer])
 452   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 453   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 454                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 455   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 456                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 457   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 458                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 459   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 460   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 461   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 462   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 463   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 464   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 465   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 466   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
 467   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 468   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 469                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 470   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
 471                   [OVS_DEFINE([HAVE_L4_RXHASH])])
 472   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
 473   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
 474   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
 475
 476   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 477                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 478   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 479                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 480   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 481                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 482
 483   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 484   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 485
 486   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [dst_discard_sk])
 487   OVS_GREP_IFELSE([$KSRC/include/net/dst.h], [__skb_dst_copy])
 488
 489   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 490   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 491   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 492   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
 493   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
 494                   [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
 495   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
 496   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
 497                   [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
 498
 499   OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
 500                         [genl_multicast_group], [id])
 501   OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
 502
 503   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 504   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 505   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 506   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [ip6_local_out_sk])
 507   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [__ipv6_addr_jhash])
 508   OVS_GREP_IFELSE([$KSRC/include/net/ip6_fib.h], [rt6i.*u.dst],
 509                   [OVS_DEFINE([HAVE_RT6INFO_DST_UNION])])
 510   OVS_GREP_IFELSE([$KSRC/include/net/ip6_route.h], [ip6_frag.*sock],
 511                   [OVS_DEFINE([HAVE_IP_FRAGMENT_TAKES_SOCK])])
 512
 513   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 514   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 515   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 516   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 517   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
 518   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 519   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 520   OVS_GREP_IFELSE([$KSRC/include/linux/netlink.h], [void.*netlink_set_err],
 521                   [OVS_DEFINE([HAVE_VOID_NETLINK_SET_ERR])])
 522
 523   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 524
 525   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 526                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 527   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
 528   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
 529   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_get_protocol])
 530
 531   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 532
 533   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
 534                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 535   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
 536                   [OVS_DEFINE([HAVE_VXLAN_METADATA])])
 537   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [VXLAN_HF_RCO])
 538   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 539                   [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
 540                                    [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
 541   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
 542   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_set_csum])
 543   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [udp_tunnel_gro_complete])
 544   OVS_GREP_IFELSE([$KSRC/include/net/udp_tunnel.h], [ipv6_v6only],
 545                   [OVS_DEFINE([HAVE_UDP_TUNNEL_IPV6])])
 546
 547   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df],
 548                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 549   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 550                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 551
 552   OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
 553                   [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
 554
 555   dnl Conntrack support, and therefore, IP fragment handling backport, should
 556   dnl only be enabled on kernels 3.10+. In future when OVS drops support for
 557   dnl kernels older than 3.10, this macro could be removed from the codebase.
 558   if test "$version" = 4; then
 559         OVS_DEFINE([OVS_FRAGMENT_BACKPORT])
 560   elif test "$version" = 3 && test "$patchlevel" -ge 10; then
 561         OVS_DEFINE([OVS_FRAGMENT_BACKPORT])
 562   fi
 563
 564   if cmp -s datapath/linux/kcompat.h.new \
 565             datapath/linux/kcompat.h >/dev/null 2>&1; then
 566     rm datapath/linux/kcompat.h.new
 567   else
 568     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 569   fi
 570 ])
 571
 572 dnl Checks for net/if_packet.h.
 573 AC_DEFUN([OVS_CHECK_IF_PACKET],
 574   [AC_CHECK_HEADER([net/if_packet.h],
 575                    [HAVE_IF_PACKET=yes],
 576                    [HAVE_IF_PACKET=no])
 577    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 578    if test "$HAVE_IF_PACKET" = yes; then
 579       AC_DEFINE([HAVE_IF_PACKET], [1],
 580                 [Define to 1 if net/if_packet.h is available.])
 581    fi])
 582
 583 dnl Checks for net/if_dl.h.
 584 dnl
 585 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 586 dnl or NetBSD.)
 587 AC_DEFUN([OVS_CHECK_IF_DL],
 588   [AC_CHECK_HEADER([net/if_dl.h],
 589                    [HAVE_IF_DL=yes],
 590                    [HAVE_IF_DL=no])
 591    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 592    if test "$HAVE_IF_DL" = yes; then
 593       AC_DEFINE([HAVE_IF_DL], [1],
 594                 [Define to 1 if net/if_dl.h is available.])
 595
 596       # On these platforms we use libpcap to access network devices.
 597       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 598    fi])
 599
 600 dnl Checks for buggy strtok_r.
 601 dnl
 602 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 603 dnl with optimization that can cause segfaults:
 604 dnl
 605 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 606 AC_DEFUN([OVS_CHECK_STRTOK_R],
 607   [AC_CACHE_CHECK(
 608      [whether strtok_r macro segfaults on some inputs],
 609      [ovs_cv_strtok_r_bug],
 610      [AC_RUN_IFELSE(
 611         [AC_LANG_PROGRAM([#include <stdio.h>
 612                           #include <string.h>
 613                          ],
 614                          [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
 615                            /* Assume bug is present, because relatively minor
 616                               changes in compiler settings (e.g. optimization
 617                               level) can make it crop up. */
 618                            return 1;
 619                            #else
 620                            char string[] = ":::";
 621                            char *save_ptr = (char *) 0xc0ffee;
 622                            char *token1, *token2;
 623                            token1 = strtok_r(string, ":", &save_ptr);
 624                            token2 = strtok_r(NULL, ":", &save_ptr);
 625                            freopen ("/dev/null", "w", stdout);
 626                            printf ("%s %s\n", token1, token2);
 627                            return 0;
 628                            #endif
 629                           ]])],
 630         [ovs_cv_strtok_r_bug=no],
 631         [ovs_cv_strtok_r_bug=yes],
 632         [ovs_cv_strtok_r_bug=yes])])
 633    if test $ovs_cv_strtok_r_bug = yes; then
 634      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 635                [Define if strtok_r macro segfaults on some inputs])
 636    fi
 637 ])
 638
 639 dnl ----------------------------------------------------------------------
 640 dnl These macros are from GNU PSPP, with the following original license:
 641 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 642 dnl This file is free software; the Free Software Foundation
 643 dnl gives unlimited permission to copy and/or distribute it,
 644 dnl with or without modifications, as long as this notice is preserved.
 645
 646 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 647   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
 648   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 649     [ovs_save_CFLAGS="$CFLAGS"
 650      dnl Include -Werror in the compiler options, because without -Werror
 651      dnl clang's GCC-compatible compiler driver does not return a failure
 652      dnl exit status even though it complains about options it does not
 653      dnl understand.
 654      dnl
 655      dnl Also, check stderr as gcc exits with status 0 for options
 656      dnl rejected at getopt level.
 657      dnl    % touch /tmp/a.c
 658      dnl    % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
 659      dnl    gcc: unrecognized option '-Qunused-arguments'
 660      dnl    0
 661      dnl    %
 662      CFLAGS="$CFLAGS $WERROR $1"
 663      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [if test -s conftest.err && grep "unrecognized option" conftest.err; then ovs_cv_name[]=no; else ovs_cv_name[]=yes; fi], [ovs_cv_name[]=no])
 664      CFLAGS="$ovs_save_CFLAGS"])
 665   if test $ovs_cv_name = yes; then
 666     m4_if([$2], [], [:], [$2])
 667   else
 668     m4_if([$3], [], [:], [$3])
 669   fi
 670 ])
 671
 672 dnl OVS_CHECK_WERROR
 673 dnl
 674 dnl Check whether the C compiler accepts -Werror.
 675 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 676 AC_DEFUN([OVS_CHECK_WERROR],
 677   [WERROR=
 678    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 679
 680 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 681 dnl Check whether the given C compiler OPTION is accepted.
 682 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 683 AC_DEFUN([OVS_CHECK_CC_OPTION],
 684   [AC_REQUIRE([OVS_CHECK_WERROR])
 685    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 686
 687 dnl OVS_ENABLE_OPTION([OPTION])
 688 dnl Check whether the given C compiler OPTION is accepted.
 689 dnl If so, add it to WARNING_FLAGS.
 690 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 691 AC_DEFUN([OVS_ENABLE_OPTION],
 692   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 693    AC_SUBST([WARNING_FLAGS])])
 694
 695 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 696 dnl Check whether the given C compiler OPTION is accepted.
 697 dnl If so, enable the given Automake CONDITIONAL.
 698
 699 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 700 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 701   [OVS_CHECK_CC_OPTION(
 702     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 703    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 704 dnl ----------------------------------------------------------------------
 705
 706 dnl Check for too-old XenServer.
 707 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 708   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 709     [if test -e /etc/redhat-release; then
 710        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 711      fi
 712      if test -z "$ovs_cv_xsversion"; then
 713        ovs_cv_xsversion=none
 714      fi])
 715   case $ovs_cv_xsversion in
 716     none)
 717       ;;
 718
 719     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 720     [[6-9]]* |                           dnl XenServer 6 or later
 721     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 722     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 723     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 724     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 725       ;;
 726
 727     *)
 728       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.)])
 729       ;;
 730   esac])
 731
 732 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 733 dnl
 734 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 735 dnl Runs 'if-true' if so, 'if-false' otherwise.
 736 AC_DEFUN([OVS_CHECK_MAKE_IF],
 737   [AC_CACHE_CHECK(
 738      [whether ${MAKE-make} has GNU make \$(if) extension],
 739      [ovs_cv_gnu_make_if],
 740      [cat <<'EOF' > conftest.mk
 741 conftest.out:
 742         echo $(if x,y,z) > conftest.out
 743 .PHONY: all
 744 EOF
 745       rm -f conftest.out
 746       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 747       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 748       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 749       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 750       result=`cat conftest.out`
 751       rm -f conftest.mk conftest.out
 752       if test "X$result" = "Xy"; then
 753         ovs_cv_gnu_make_if=yes
 754       else
 755         ovs_cv_gnu_make_if=no
 756       fi])])
 757
 758 dnl OVS_CHECK_GNU_MAKE
 759 dnl
 760 dnl Checks whether make is GNU make (because Linux kernel Makefiles
 761 dnl only work with GNU make).
 762 AC_DEFUN([OVS_CHECK_GNU_MAKE],
 763   [AC_CACHE_CHECK(
 764      [whether ${MAKE-make} is GNU make],
 765      [ovs_cv_gnu_make],
 766      [rm -f conftest.out
 767       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
 768       ${MAKE-make} --version >conftest.out 2>&1
 769       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 770       result=`cat conftest.out`
 771       rm -f conftest.mk conftest.out
 772
 773       case $result in # (
 774         GNU*) ovs_cv_gnu_make=yes ;; # (
 775         *) ovs_cv_gnu_make=no ;;
 776       esac])
 777    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
 778
 779 dnl OVS_CHECK_SPARSE_TARGET
 780 dnl
 781 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 782 dnl target for which the code is being built.  This helps it out.
 783 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 784   [AC_CACHE_CHECK(
 785     [target hint for cgcc],
 786     [ac_cv_sparse_target],
 787     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 788        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 789        [x86_64-*], [ac_cv_sparse_target=x86_64],
 790        [ac_cv_sparse_target=other])])
 791    AS_CASE([$ac_cv_sparse_target],
 792      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 793      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 794      [SPARSEFLAGS= CGCCFLAGS=])
 795    AC_SUBST([SPARSEFLAGS])
 796    AC_SUBST([CGCCFLAGS])])
 797
 798 dnl OVS_SPARSE_EXTRA_INCLUDES
 799 dnl
 800 dnl The cgcc script from "sparse" does not search gcc's default
 801 dnl search path. Get the default search path from GCC and pass
 802 dnl them to sparse.
 803 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 804     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 805            [`$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 ' ' `] ))
 806
 807 dnl OVS_ENABLE_SPARSE
 808 AC_DEFUN([OVS_ENABLE_SPARSE],
 809   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 810    AC_REQUIRE([OVS_CHECK_MAKE_IF])
 811    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 812    : ${SPARSE=sparse}
 813    AC_SUBST([SPARSE])
 814    AC_CONFIG_COMMANDS_PRE(
 815      [if test $ovs_cv_gnu_make_if = yes; then
 816         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
 817       fi])])
 818
 819 dnl OVS_PTHREAD_SET_NAME
 820 dnl
 821 dnl This checks for three known variants of pthreads functions for setting
 822 dnl the name of the current thread:
 823 dnl
 824 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 825 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 826 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 827 dnl
 828 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 829 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 830 dnl provide to it.
 831 dnl
 832 dnl This macro defines:
 833 dnl
 834 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 835 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 836 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 837 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 838   [AC_CHECK_FUNCS([pthread_set_name_np])
 839    if test $ac_cv_func_pthread_set_name_np != yes; then
 840      AC_CACHE_CHECK(
 841        [for pthread_setname_np() variant],
 842        [ovs_cv_pthread_setname_np],
 843        [AC_LINK_IFELSE(
 844          [AC_LANG_PROGRAM([#include <pthread.h>
 845   ], [pthread_setname_np(pthread_self(), "name");])],
 846          [ovs_cv_pthread_setname_np=glibc],
 847          [AC_LINK_IFELSE(
 848            [AC_LANG_PROGRAM([#include <pthread.h>
 849 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 850            [ovs_cv_pthread_setname_np=netbsd],
 851            [ovs_cv_pthread_setname_np=none])])])
 852      case $ovs_cv_pthread_setname_np in # (
 853        glibc)
 854           AC_DEFINE(
 855             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 856             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 857           ;; # (
 858        netbsd)
 859           AC_DEFINE(
 860             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 861             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 862           ;;
 863      esac
 864    fi])
 865
 866 dnl OVS_CHECK_LINUX_HOST.
 867 dnl
 868 dnl Checks whether we're building for a Linux host, based on the presence of
 869 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
 870 dnl LINUX based on the result.
 871 AC_DEFUN([OVS_CHECK_LINUX_HOST],
 872   [AC_CACHE_CHECK(
 873      [whether __linux__ is defined],
 874      [ovs_cv_linux],
 875      [AC_COMPILE_IFELSE(
 876         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
 877         [ovs_cv_linux=true],
 878         [ovs_cv_linux=false])])
 879    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])