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 18; then
 138           : # Linux 3.x
 139        else
 140          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.18.x is not supported (please refer to the FAQ for advice)])
 141        fi
 142     else
 143        if test "$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   OVS_GREP_IFELSE([$KSRC/include/linux/hash.h], [fast_hash_ops])
 288
 289   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 290   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 291
 292   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 293
 294   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 295   OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
 296                   [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
 297
 298   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 299   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 300   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 301   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 302   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 303   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 304   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
 305
 306   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 307
 308   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 309                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 310                                    [rcu_read_lock_held])])
 311   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 312
 313   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 314   # is necessary because some versions of this header remove the
 315   # member but retain the kerneldoc comment that describes it (which
 316   # starts with @).  The brackets must be doubled because of m4
 317   # quoting rules.
 318   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 319                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 320   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 321   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 322                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 323   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 324                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 325   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 326                   [skb_copy_from_linear_data_offset])
 327   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 328                   [skb_reset_tail_pointer])
 329   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 330   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 331                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 332   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 333                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 334   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 335                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 336   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 337   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 338   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 339   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 340   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 341   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 342   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 343   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
 344   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 345   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
 346                   [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
 347   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
 348
 349   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 350                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 351   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 352                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 353   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 354                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 355
 356   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 357   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 358
 359   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
 360   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
 361   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 362   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
 363   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 364   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_handle_offloads])
 365   OVS_GREP_IFELSE([$KSRC/include/net/ip_tunnels.h], [iptunnel_xmit.*net],
 366                   [OVS_DEFINE([HAVE_IPTUNNEL_XMIT_NET])])
 367   OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
 368   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 369   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 370   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 371   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 372   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 373   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
 374
 375   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 376
 377   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 378                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 379
 380   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 381
 382   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
 383                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 384   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [vxlan_xmit_skb])
 385   OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [bool xnet],
 386                   [OVS_DEFINE([HAVE_VXLAN_XMIT_SKB_XNET_ARG])])
 387   OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
 388                   [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])
 389   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
 390                   [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
 391   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
 392                   [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
 393
 394   OVS_CHECK_LOG2_H
 395
 396   if cmp -s datapath/linux/kcompat.h.new \
 397             datapath/linux/kcompat.h >/dev/null 2>&1; then
 398     rm datapath/linux/kcompat.h.new
 399   else
 400     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 401   fi
 402 ])
 403
 404 dnl Checks for net/if_packet.h.
 405 AC_DEFUN([OVS_CHECK_IF_PACKET],
 406   [AC_CHECK_HEADER([net/if_packet.h],
 407                    [HAVE_IF_PACKET=yes],
 408                    [HAVE_IF_PACKET=no])
 409    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 410    if test "$HAVE_IF_PACKET" = yes; then
 411       AC_DEFINE([HAVE_IF_PACKET], [1],
 412                 [Define to 1 if net/if_packet.h is available.])
 413    fi])
 414
 415 dnl Checks for net/if_dl.h.
 416 dnl
 417 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 418 dnl or NetBSD.)
 419 AC_DEFUN([OVS_CHECK_IF_DL],
 420   [AC_CHECK_HEADER([net/if_dl.h],
 421                    [HAVE_IF_DL=yes],
 422                    [HAVE_IF_DL=no])
 423    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 424    if test "$HAVE_IF_DL" = yes; then
 425       AC_DEFINE([HAVE_IF_DL], [1],
 426                 [Define to 1 if net/if_dl.h is available.])
 427
 428       # On these platforms we use libpcap to access network devices.
 429       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 430    fi])
 431
 432 dnl Checks for buggy strtok_r.
 433 dnl
 434 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 435 dnl with optimization that can cause segfaults:
 436 dnl
 437 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 438 AC_DEFUN([OVS_CHECK_STRTOK_R],
 439   [AC_CACHE_CHECK(
 440      [whether strtok_r macro segfaults on some inputs],
 441      [ovs_cv_strtok_r_bug],
 442      [AC_RUN_IFELSE(
 443         [AC_LANG_PROGRAM([#include <stdio.h>
 444                           #include <string.h>
 445                          ],
 446                          [[char string[] = ":::";
 447                            char *save_ptr = (char *) 0xc0ffee;
 448                            char *token1, *token2;
 449                            token1 = strtok_r(string, ":", &save_ptr);
 450                            token2 = strtok_r(NULL, ":", &save_ptr);
 451                            freopen ("/dev/null", "w", stdout);
 452                            printf ("%s %s\n", token1, token2);
 453                            return 0;
 454                           ]])],
 455         [ovs_cv_strtok_r_bug=no],
 456         [ovs_cv_strtok_r_bug=yes],
 457         [ovs_cv_strtok_r_bug=yes])])
 458    if test $ovs_cv_strtok_r_bug = yes; then
 459      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 460                [Define if strtok_r macro segfaults on some inputs])
 461    fi
 462 ])
 463
 464 dnl ----------------------------------------------------------------------
 465 dnl These macros are from GNU PSPP, with the following original license:
 466 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 467 dnl This file is free software; the Free Software Foundation
 468 dnl gives unlimited permission to copy and/or distribute it,
 469 dnl with or without modifications, as long as this notice is preserved.
 470
 471 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 472   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
 473   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 474     [ovs_save_CFLAGS="$CFLAGS"
 475      dnl Include -Werror in the compiler options, because without -Werror
 476      dnl clang's GCC-compatible compiler driver does not return a failure
 477      dnl exit status even though it complains about options it does not
 478      dnl understand.
 479      CFLAGS="$CFLAGS $WERROR $1"
 480      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 481      CFLAGS="$ovs_save_CFLAGS"])
 482   if test $ovs_cv_name = yes; then
 483     m4_if([$2], [], [:], [$2])
 484   else
 485     m4_if([$3], [], [:], [$3])
 486   fi
 487 ])
 488
 489 dnl OVS_CHECK_WERROR
 490 dnl
 491 dnl Check whether the C compiler accepts -Werror.
 492 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 493 AC_DEFUN([OVS_CHECK_WERROR],
 494   [WERROR=
 495    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 496
 497 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 498 dnl Check whether the given C compiler OPTION is accepted.
 499 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 500 AC_DEFUN([OVS_CHECK_CC_OPTION],
 501   [AC_REQUIRE([OVS_CHECK_WERROR])
 502    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 503
 504 dnl OVS_ENABLE_OPTION([OPTION])
 505 dnl Check whether the given C compiler OPTION is accepted.
 506 dnl If so, add it to WARNING_FLAGS.
 507 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 508 AC_DEFUN([OVS_ENABLE_OPTION],
 509   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 510    AC_SUBST([WARNING_FLAGS])])
 511
 512 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 513 dnl Check whether the given C compiler OPTION is accepted.
 514 dnl If so, enable the given Automake CONDITIONAL.
 515
 516 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 517 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 518   [OVS_CHECK_CC_OPTION(
 519     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 520    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 521 dnl ----------------------------------------------------------------------
 522
 523 dnl Check for too-old XenServer.
 524 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 525   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 526     [if test -e /etc/redhat-release; then
 527        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 528      fi
 529      if test -z "$ovs_cv_xsversion"; then
 530        ovs_cv_xsversion=none
 531      fi])
 532   case $ovs_cv_xsversion in
 533     none)
 534       ;;
 535
 536     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 537     [[6-9]]* |                           dnl XenServer 6 or later
 538     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 539     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 540     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 541     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 542       ;;
 543
 544     *)
 545       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.)])
 546       ;;
 547   esac])
 548
 549 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 550 dnl
 551 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 552 dnl Runs 'if-true' if so, 'if-false' otherwise.
 553 AC_DEFUN([OVS_CHECK_MAKE_IF],
 554   [AC_CACHE_CHECK(
 555      [whether ${MAKE-make} has GNU make \$(if) extension],
 556      [ovs_cv_gnu_make_if],
 557      [cat <<'EOF' > conftest.mk
 558 conftest.out:
 559         echo $(if x,y,z) > conftest.out
 560 .PHONY: all
 561 EOF
 562       rm -f conftest.out
 563       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 564       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 565       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 566       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 567       result=`cat conftest.out`
 568       rm -f conftest.mk conftest.out
 569       if test "X$result" = "Xy"; then
 570         ovs_cv_gnu_make_if=yes
 571       else
 572         ovs_cv_gnu_make_if=no
 573       fi])])
 574
 575 dnl OVS_CHECK_GNU_MAKE
 576 dnl
 577 dnl Checks whether make is GNU make (because Linux kernel Makefiles
 578 dnl only work with GNU make).
 579 AC_DEFUN([OVS_CHECK_GNU_MAKE],
 580   [AC_CACHE_CHECK(
 581      [whether ${MAKE-make} is GNU make],
 582      [ovs_cv_gnu_make],
 583      [rm -f conftest.out
 584       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
 585       ${MAKE-make} --version >conftest.out 2>&1
 586       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 587       result=`cat conftest.out`
 588       rm -f conftest.mk conftest.out
 589
 590       case $result in # (
 591         GNU*) ovs_cv_gnu_make=yes ;; # (
 592         *) ovs_cv_gnu_make=no ;;
 593       esac])
 594    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
 595
 596 dnl OVS_CHECK_SPARSE_TARGET
 597 dnl
 598 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 599 dnl target for which the code is being built.  This helps it out.
 600 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 601   [AC_CACHE_CHECK(
 602     [target hint for cgcc],
 603     [ac_cv_sparse_target],
 604     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 605        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 606        [x86_64-*], [ac_cv_sparse_target=x86_64],
 607        [ac_cv_sparse_target=other])])
 608    AS_CASE([$ac_cv_sparse_target],
 609      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 610      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 611      [SPARSEFLAGS= CGCCFLAGS=])
 612    AC_SUBST([SPARSEFLAGS])
 613    AC_SUBST([CGCCFLAGS])])
 614
 615 dnl OVS_SPARSE_EXTRA_INCLUDES
 616 dnl
 617 dnl The cgcc script from "sparse" does not search gcc's default
 618 dnl search path. Get the default search path from GCC and pass
 619 dnl them to sparse.
 620 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 621     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 622            [`$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 ' ' `] ))
 623
 624 dnl OVS_ENABLE_SPARSE
 625 AC_DEFUN([OVS_ENABLE_SPARSE],
 626   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 627    AC_REQUIRE([OVS_CHECK_MAKE_IF])
 628    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 629    : ${SPARSE=sparse}
 630    AC_SUBST([SPARSE])
 631    AC_CONFIG_COMMANDS_PRE(
 632      [if test $ovs_cv_gnu_make_if = yes; then
 633         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
 634       fi])])
 635
 636 dnl OVS_PTHREAD_SET_NAME
 637 dnl
 638 dnl This checks for three known variants of pthreads functions for setting
 639 dnl the name of the current thread:
 640 dnl
 641 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 642 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 643 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 644 dnl
 645 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 646 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 647 dnl provide to it.
 648 dnl
 649 dnl This macro defines:
 650 dnl
 651 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 652 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 653 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 654 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 655   [AC_CHECK_FUNCS([pthread_set_name_np])
 656    if test $ac_cv_func_pthread_set_name_np != yes; then
 657      AC_CACHE_CHECK(
 658        [for pthread_setname_np() variant],
 659        [ovs_cv_pthread_setname_np],
 660        [AC_LINK_IFELSE(
 661          [AC_LANG_PROGRAM([#include <pthread.h>
 662   ], [pthread_setname_np(pthread_self(), "name");])],
 663          [ovs_cv_pthread_setname_np=glibc],
 664          [AC_LINK_IFELSE(
 665            [AC_LANG_PROGRAM([#include <pthread.h>
 666 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 667            [ovs_cv_pthread_setname_np=netbsd],
 668            [ovs_cv_pthread_setname_np=none])])])
 669      case $ovs_cv_pthread_setname_np in # (
 670        glibc)
 671           AC_DEFINE(
 672             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 673             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 674           ;; # (
 675        netbsd)
 676           AC_DEFINE(
 677             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 678             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 679           ;;
 680      esac
 681    fi])
 682
 683 dnl OVS_CHECK_LINUX_HOST.
 684 dnl
 685 dnl Checks whether we're building for a Linux host, based on the presence of
 686 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
 687 dnl LINUX based on the result.
 688 AC_DEFUN([OVS_CHECK_LINUX_HOST],
 689   [AC_CACHE_CHECK(
 690      [whether __linux__ is defined],
 691      [ovs_cv_linux],
 692      [AC_COMPILE_IFELSE(
 693         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
 694         [ovs_cv_linux=true],
 695         [ovs_cv_linux=false])])
 696    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])