acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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$enable_Werror" = Xyes; then
  25         CFLAGS="$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 11; then
 138           : # Linux 3.x
 139        else
 140          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.11.x is not supported])
 141        fi
 142     else
 143        if test "$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_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 161 dnl
 162 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 163 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 164 dnl <REGEX> translated to uppercase.
 165 AC_DEFUN([OVS_GREP_IFELSE], [
 166   AC_MSG_CHECKING([whether $2 matches in $1])
 167   if test -f $1; then
 168     grep '$2' $1 >/dev/null 2>&1
 169     status=$?
 170     case $status in
 171       0)
 172         AC_MSG_RESULT([yes])
 173         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 174         ;;
 175       1)
 176         AC_MSG_RESULT([no])
 177         $4
 178         ;;
 179       *)
 180         AC_MSG_ERROR([grep exited with status $status])
 181         ;;
 182     esac
 183   else
 184     AC_MSG_RESULT([file not found])
 185     $4
 186   fi
 187 ])
 188
 189 dnl OVS_DEFINE(NAME)
 190 dnl
 191 dnl Defines NAME to 1 in kcompat.h.
 192 AC_DEFUN([OVS_DEFINE], [
 193   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 194 ])
 195
 196 AC_DEFUN([OVS_CHECK_LOG2_H], [
 197   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
 198   if test -e $KSRC/include/linux/log2.h; then
 199     AC_MSG_RESULT([yes])
 200     OVS_DEFINE([HAVE_LOG2_H])
 201   else
 202     AC_MSG_RESULT([no])
 203   fi
 204 ])
 205
 206 dnl OVS_CHECK_LINUX_COMPAT
 207 dnl
 208 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 209 dnl the directory in $KBUILD.
 210 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 211   rm -f datapath/linux/kcompat.h.new
 212   mkdir -p datapath/linux
 213   : > datapath/linux/kcompat.h.new
 214
 215   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 216                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 217
 218   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 219
 220   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 221
 222   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 223
 224   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 225
 226   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 227   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 228   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 229   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 230   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 231   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 232
 233   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 234                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 235                                    [rcu_read_lock_held])])
 236   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 237
 238   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 239   # is necessary because some versions of this header remove the
 240   # member but retain the kerneldoc comment that describes it (which
 241   # starts with @).  The brackets must be doubled because of m4
 242   # quoting rules.
 243   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 244                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 245   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 246   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 247                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 248   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 249                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 250   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 251                   [skb_copy_from_linear_data_offset])
 252   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 253                   [skb_reset_tail_pointer])
 254   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 255   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 256                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 257   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 258                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 259   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 260                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 261   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 262   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 263   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 264   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 265   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 266   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 267   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 268   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
 269
 270   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 271                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 272   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 273                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 274   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 275                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 276
 277   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 278   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 279
 280   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 281   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 282   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 283   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 284   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 285   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 286   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 287
 288   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 289
 290   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 291                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 292
 293   OVS_GREP_IFELSE([$KSRC/include/linux/percpu.h], [this_cpu_ptr])
 294
 295   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 296
 297   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
 298                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 299
 300   OVS_CHECK_LOG2_H
 301
 302   if cmp -s datapath/linux/kcompat.h.new \
 303             datapath/linux/kcompat.h >/dev/null 2>&1; then
 304     rm datapath/linux/kcompat.h.new
 305   else
 306     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 307   fi
 308 ])
 309
 310 dnl Checks for net/if_packet.h.
 311 AC_DEFUN([OVS_CHECK_IF_PACKET],
 312   [AC_CHECK_HEADER([net/if_packet.h],
 313                    [HAVE_IF_PACKET=yes],
 314                    [HAVE_IF_PACKET=no])
 315    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 316    if test "$HAVE_IF_PACKET" = yes; then
 317       AC_DEFINE([HAVE_IF_PACKET], [1],
 318                 [Define to 1 if net/if_packet.h is available.])
 319    fi])
 320
 321 dnl Checks for net/if_dl.h.
 322 dnl
 323 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 324 dnl or NetBSD.)
 325 AC_DEFUN([OVS_CHECK_IF_DL],
 326   [AC_CHECK_HEADER([net/if_dl.h],
 327                    [HAVE_IF_DL=yes],
 328                    [HAVE_IF_DL=no])
 329    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 330    if test "$HAVE_IF_DL" = yes; then
 331       AC_DEFINE([HAVE_IF_DL], [1],
 332                 [Define to 1 if net/if_dl.h is available.])
 333
 334       # On these platforms we use libpcap to access network devices.
 335       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 336    fi])
 337
 338 dnl Checks for buggy strtok_r.
 339 dnl
 340 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 341 dnl with optimization that can cause segfaults:
 342 dnl
 343 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 344 AC_DEFUN([OVS_CHECK_STRTOK_R],
 345   [AC_CACHE_CHECK(
 346      [whether strtok_r macro segfaults on some inputs],
 347      [ovs_cv_strtok_r_bug],
 348      [AC_RUN_IFELSE(
 349         [AC_LANG_PROGRAM([#include <stdio.h>
 350                           #include <string.h>
 351                          ],
 352                          [[char string[] = ":::";
 353                            char *save_ptr = (char *) 0xc0ffee;
 354                            char *token1, *token2;
 355                            token1 = strtok_r(string, ":", &save_ptr);
 356                            token2 = strtok_r(NULL, ":", &save_ptr);
 357                            freopen ("/dev/null", "w", stdout);
 358                            printf ("%s %s\n", token1, token2);
 359                            return 0;
 360                           ]])],
 361         [ovs_cv_strtok_r_bug=no],
 362         [ovs_cv_strtok_r_bug=yes],
 363         [ovs_cv_strtok_r_bug=yes])])
 364    if test $ovs_cv_strtok_r_bug = yes; then
 365      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 366                [Define if strtok_r macro segfaults on some inputs])
 367    fi
 368 ])
 369
 370 dnl ----------------------------------------------------------------------
 371 dnl These macros are from GNU PSPP, with the following original license:
 372 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 373 dnl This file is free software; the Free Software Foundation
 374 dnl gives unlimited permission to copy and/or distribute it,
 375 dnl with or without modifications, as long as this notice is preserved.
 376
 377 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 378   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
 379   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 380     [ovs_save_CFLAGS="$CFLAGS"
 381      dnl Include -Werror in the compiler options, because without -Werror
 382      dnl clang's GCC-compatible compiler driver does not return a failure
 383      dnl exit status even though it complains about options it does not
 384      dnl understand.
 385      CFLAGS="$CFLAGS $WERROR $1"
 386      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 387      CFLAGS="$ovs_save_CFLAGS"])
 388   if test $ovs_cv_name = yes; then
 389     m4_if([$2], [], [:], [$2])
 390   else
 391     m4_if([$3], [], [:], [$3])
 392   fi
 393 ])
 394
 395 dnl OVS_CHECK_WERROR
 396 dnl
 397 dnl Check whether the C compiler accepts -Werror.
 398 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 399 AC_DEFUN([OVS_CHECK_WERROR],
 400   [WERROR=
 401    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 402
 403 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 404 dnl Check whether the given C compiler OPTION is accepted.
 405 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 406 AC_DEFUN([OVS_CHECK_CC_OPTION],
 407   [AC_REQUIRE([OVS_CHECK_WERROR])
 408    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 409
 410 dnl OVS_ENABLE_OPTION([OPTION])
 411 dnl Check whether the given C compiler OPTION is accepted.
 412 dnl If so, add it to WARNING_FLAGS.
 413 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 414 AC_DEFUN([OVS_ENABLE_OPTION],
 415   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 416    AC_SUBST([WARNING_FLAGS])])
 417
 418 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 419 dnl Check whether the given C compiler OPTION is accepted.
 420 dnl If so, enable the given Automake CONDITIONAL.
 421
 422 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 423 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 424   [OVS_CHECK_CC_OPTION(
 425     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 426    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 427 dnl ----------------------------------------------------------------------
 428
 429 dnl Check for too-old XenServer.
 430 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 431   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 432     [if test -e /etc/redhat-release; then
 433        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 434      fi
 435      if test -z "$ovs_cv_xsversion"; then
 436        ovs_cv_xsversion=none
 437      fi])
 438   case $ovs_cv_xsversion in
 439     none)
 440       ;;
 441
 442     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 443     [[6-9]]* |                           dnl XenServer 6 or later
 444     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 445     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 446     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 447     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 448       ;;
 449
 450     *)
 451       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.)])
 452       ;;
 453   esac])
 454
 455 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 456 dnl
 457 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 458 dnl Runs 'if-true' if so, 'if-false' otherwise.
 459 AC_DEFUN([OVS_CHECK_MAKE_IF],
 460   [AC_CACHE_CHECK(
 461      [whether ${MAKE-make} has GNU make \$(if) extension],
 462      [ovs_cv_gnu_make_if],
 463      [cat <<'EOF' > conftest.mk
 464 conftest.out:
 465         echo $(if x,y,z) > conftest.out
 466 .PHONY: all
 467 EOF
 468       rm -f conftest.out
 469       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 470       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 471       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 472       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 473       result=`cat conftest.out`
 474       rm -f conftest.mk conftest.out
 475       if test "X$result" = "Xy"; then
 476         ovs_cv_gnu_make_if=yes
 477       else
 478         ovs_cv_gnu_make_if=no
 479       fi])])
 480
 481 dnl OVS_CHECK_GNU_MAKE
 482 dnl
 483 dnl Checks whether make is GNU make (because Linux kernel Makefiles
 484 dnl only work with GNU make).
 485 AC_DEFUN([OVS_CHECK_GNU_MAKE],
 486   [AC_CACHE_CHECK(
 487      [whether ${MAKE-make} is GNU make],
 488      [ovs_cv_gnu_make],
 489      [rm -f conftest.out
 490       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
 491       ${MAKE-make} --version >conftest.out 2>&1
 492       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 493       result=`cat conftest.out`
 494       rm -f conftest.mk conftest.out
 495
 496       case $result in # (
 497         GNU*) ovs_cv_gnu_make=yes ;; # (
 498         *) ovs_cv_gnu_make=no ;;
 499       esac])
 500    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
 501
 502 dnl OVS_CHECK_SPARSE_TARGET
 503 dnl
 504 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 505 dnl target for which the code is being built.  This helps it out.
 506 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 507   [AC_CACHE_CHECK(
 508     [target hint for cgcc],
 509     [ac_cv_sparse_target],
 510     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 511        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 512        [x86_64-*], [ac_cv_sparse_target=x86_64],
 513        [ac_cv_sparse_target=other])])
 514    AS_CASE([$ac_cv_sparse_target],
 515      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 516      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 517      [SPARSEFLAGS= CGCCFLAGS=])
 518    AC_SUBST([SPARSEFLAGS])
 519    AC_SUBST([CGCCFLAGS])])
 520
 521 dnl OVS_SPARSE_EXTRA_INCLUDES
 522 dnl
 523 dnl The cgcc script from "sparse" does not search gcc's default
 524 dnl search path. Get the default search path from GCC and pass
 525 dnl them to sparse.
 526 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 527     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 528            [`$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 ' ' `] ))
 529
 530 dnl OVS_ENABLE_SPARSE
 531 AC_DEFUN([OVS_ENABLE_SPARSE],
 532   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 533    AC_REQUIRE([OVS_CHECK_MAKE_IF])
 534    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 535    : ${SPARSE=sparse}
 536    AC_SUBST([SPARSE])
 537    AC_CONFIG_COMMANDS_PRE(
 538      [if test $ovs_cv_gnu_make_if = yes; then
 539         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
 540       fi])])
 541
 542 dnl OVS_PTHREAD_SET_NAME
 543 dnl
 544 dnl This checks for three known variants of pthreads functions for setting
 545 dnl the name of the current thread:
 546 dnl
 547 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 548 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 549 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 550 dnl
 551 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 552 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 553 dnl provide to it.
 554 dnl
 555 dnl This macro defines:
 556 dnl
 557 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 558 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 559 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 560 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 561   [AC_CHECK_FUNCS([pthread_set_name_np])
 562    if test $ac_cv_func_pthread_set_name_np != yes; then
 563      AC_CACHE_CHECK(
 564        [for pthread_setname_np() variant],
 565        [ovs_cv_pthread_setname_np],
 566        [AC_LINK_IFELSE(
 567          [AC_LANG_PROGRAM([#include <pthread.h>
 568   ], [pthread_setname_np(pthread_self(), "name");])],
 569          [ovs_cv_pthread_setname_np=glibc],
 570          [AC_LINK_IFELSE(
 571            [AC_LANG_PROGRAM([#include <pthread.h>
 572 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 573            [ovs_cv_pthread_setname_np=netbsd],
 574            [ovs_cv_pthread_setname_np=none])])])
 575      case $ovs_cv_pthread_setname_np in # (
 576        glibc)
 577           AC_DEFINE(
 578             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 579             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 580           ;; # (
 581        netbsd)
 582           AC_DEFINE(
 583             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 584             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 585           ;;
 586      esac
 587    fi])