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$enable_Werror" = Xyes; then
  25         CFLAGS="$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 14; then
 138           : # Linux 3.x
 139        else
 140          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.14.x is not supported (please refer to the FAQ for advice)])
 141        fi
 142     else
 143        if test "$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
 174     LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
 175     CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
 176
 177     # On some systems we have to add -ldl to link with dpdk
 178     #
 179     # This code, at first, tries to link without -ldl (""),
 180     # then adds it and tries again.
 181     # Before each attempt the search cache must be unset,
 182     # otherwise autoconf will stick with the old result
 183
 184     found=false
 185     save_LIBS=$LIBS
 186     for extras in "" "-ldl"; do
 187         LIBS="-lintel_dpdk $extras $save_LIBS"
 188         AC_LINK_IFELSE(
 189            [AC_LANG_PROGRAM([#include <rte_config.h>
 190                              #include <rte_eal.h>],
 191                             [int rte_argc; char ** rte_argv;
 192                              rte_eal_init(rte_argc, rte_argv);])],
 193            [found=true])
 194         if $found; then
 195             break
 196         fi
 197     done
 198     if $found; then :; else
 199         AC_MSG_ERROR([cannot link with dpdk])
 200     fi
 201
 202     AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
 203   else
 204     RTE_SDK=
 205   fi
 206
 207   AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
 208 ])
 209
 210 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 211 dnl
 212 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 213 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 214 dnl <REGEX> translated to uppercase.
 215 AC_DEFUN([OVS_GREP_IFELSE], [
 216   AC_MSG_CHECKING([whether $2 matches in $1])
 217   if test -f $1; then
 218     grep '$2' $1 >/dev/null 2>&1
 219     status=$?
 220     case $status in
 221       0)
 222         AC_MSG_RESULT([yes])
 223         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 224         ;;
 225       1)
 226         AC_MSG_RESULT([no])
 227         $4
 228         ;;
 229       *)
 230         AC_MSG_ERROR([grep exited with status $status])
 231         ;;
 232     esac
 233   else
 234     AC_MSG_RESULT([file not found])
 235     $4
 236   fi
 237 ])
 238
 239 dnl OVS_DEFINE(NAME)
 240 dnl
 241 dnl Defines NAME to 1 in kcompat.h.
 242 AC_DEFUN([OVS_DEFINE], [
 243   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 244 ])
 245
 246 AC_DEFUN([OVS_CHECK_LOG2_H], [
 247   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
 248   if test -e $KSRC/include/linux/log2.h; then
 249     AC_MSG_RESULT([yes])
 250     OVS_DEFINE([HAVE_LOG2_H])
 251   else
 252     AC_MSG_RESULT([no])
 253   fi
 254 ])
 255
 256 dnl OVS_CHECK_LINUX_COMPAT
 257 dnl
 258 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 259 dnl the directory in $KBUILD.
 260 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 261   rm -f datapath/linux/kcompat.h.new
 262   mkdir -p datapath/linux
 263   : > datapath/linux/kcompat.h.new
 264
 265   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 266                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 267
 268   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 269
 270   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
 271   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
 272
 273   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
 274
 275   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 276
 277   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 278   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 279   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 280   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
 281   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
 282   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
 283   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
 284
 285   OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
 286
 287   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 288                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 289                                    [rcu_read_lock_held])])
 290   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
 291
 292   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 293   # is necessary because some versions of this header remove the
 294   # member but retain the kerneldoc comment that describes it (which
 295   # starts with @).  The brackets must be doubled because of m4
 296   # quoting rules.
 297   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 298                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 299   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
 300   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
 301                   [OVS_DEFINE([HAVE_U16_RXHASH])])
 302   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 303                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 304   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 305                   [skb_copy_from_linear_data_offset])
 306   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 307                   [skb_reset_tail_pointer])
 308   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 309   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 310                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 311   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 312                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 313   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 314                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 315   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 316   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
 317   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
 318   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
 319   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
 320   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
 321   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
 322   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
 323   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
 324   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
 325
 326   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 327                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 328   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 329                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 330   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
 331                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 332
 333   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 334   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 335
 336   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
 337   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
 338   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 339   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
 340   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
 341   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
 342   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 343
 344   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
 345
 346   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 347                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 348
 349   OVS_GREP_IFELSE([$KSRC/include/linux/percpu.h], [this_cpu_ptr])
 350
 351   OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
 352
 353   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
 354                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
 355
 356   OVS_CHECK_LOG2_H
 357
 358   if cmp -s datapath/linux/kcompat.h.new \
 359             datapath/linux/kcompat.h >/dev/null 2>&1; then
 360     rm datapath/linux/kcompat.h.new
 361   else
 362     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 363   fi
 364 ])
 365
 366 dnl Checks for net/if_packet.h.
 367 AC_DEFUN([OVS_CHECK_IF_PACKET],
 368   [AC_CHECK_HEADER([net/if_packet.h],
 369                    [HAVE_IF_PACKET=yes],
 370                    [HAVE_IF_PACKET=no])
 371    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 372    if test "$HAVE_IF_PACKET" = yes; then
 373       AC_DEFINE([HAVE_IF_PACKET], [1],
 374                 [Define to 1 if net/if_packet.h is available.])
 375    fi])
 376
 377 dnl Checks for net/if_dl.h.
 378 dnl
 379 dnl (We use this as a proxy for checking whether we're building on FreeBSD
 380 dnl or NetBSD.)
 381 AC_DEFUN([OVS_CHECK_IF_DL],
 382   [AC_CHECK_HEADER([net/if_dl.h],
 383                    [HAVE_IF_DL=yes],
 384                    [HAVE_IF_DL=no])
 385    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
 386    if test "$HAVE_IF_DL" = yes; then
 387       AC_DEFINE([HAVE_IF_DL], [1],
 388                 [Define to 1 if net/if_dl.h is available.])
 389
 390       # On these platforms we use libpcap to access network devices.
 391       AC_SEARCH_LIBS([pcap_open_live], [pcap])
 392    fi])
 393
 394 dnl Checks for buggy strtok_r.
 395 dnl
 396 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 397 dnl with optimization that can cause segfaults:
 398 dnl
 399 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 400 AC_DEFUN([OVS_CHECK_STRTOK_R],
 401   [AC_CACHE_CHECK(
 402      [whether strtok_r macro segfaults on some inputs],
 403      [ovs_cv_strtok_r_bug],
 404      [AC_RUN_IFELSE(
 405         [AC_LANG_PROGRAM([#include <stdio.h>
 406                           #include <string.h>
 407                          ],
 408                          [[char string[] = ":::";
 409                            char *save_ptr = (char *) 0xc0ffee;
 410                            char *token1, *token2;
 411                            token1 = strtok_r(string, ":", &save_ptr);
 412                            token2 = strtok_r(NULL, ":", &save_ptr);
 413                            freopen ("/dev/null", "w", stdout);
 414                            printf ("%s %s\n", token1, token2);
 415                            return 0;
 416                           ]])],
 417         [ovs_cv_strtok_r_bug=no],
 418         [ovs_cv_strtok_r_bug=yes],
 419         [ovs_cv_strtok_r_bug=yes])])
 420    if test $ovs_cv_strtok_r_bug = yes; then
 421      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 422                [Define if strtok_r macro segfaults on some inputs])
 423    fi
 424 ])
 425
 426 dnl ----------------------------------------------------------------------
 427 dnl These macros are from GNU PSPP, with the following original license:
 428 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 429 dnl This file is free software; the Free Software Foundation
 430 dnl gives unlimited permission to copy and/or distribute it,
 431 dnl with or without modifications, as long as this notice is preserved.
 432
 433 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
 434   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
 435   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 436     [ovs_save_CFLAGS="$CFLAGS"
 437      dnl Include -Werror in the compiler options, because without -Werror
 438      dnl clang's GCC-compatible compiler driver does not return a failure
 439      dnl exit status even though it complains about options it does not
 440      dnl understand.
 441      CFLAGS="$CFLAGS $WERROR $1"
 442      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 443      CFLAGS="$ovs_save_CFLAGS"])
 444   if test $ovs_cv_name = yes; then
 445     m4_if([$2], [], [:], [$2])
 446   else
 447     m4_if([$3], [], [:], [$3])
 448   fi
 449 ])
 450
 451 dnl OVS_CHECK_WERROR
 452 dnl
 453 dnl Check whether the C compiler accepts -Werror.
 454 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
 455 AC_DEFUN([OVS_CHECK_WERROR],
 456   [WERROR=
 457    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
 458
 459 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 460 dnl Check whether the given C compiler OPTION is accepted.
 461 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 462 AC_DEFUN([OVS_CHECK_CC_OPTION],
 463   [AC_REQUIRE([OVS_CHECK_WERROR])
 464    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
 465
 466 dnl OVS_ENABLE_OPTION([OPTION])
 467 dnl Check whether the given C compiler OPTION is accepted.
 468 dnl If so, add it to WARNING_FLAGS.
 469 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 470 AC_DEFUN([OVS_ENABLE_OPTION],
 471   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 472    AC_SUBST([WARNING_FLAGS])])
 473
 474 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 475 dnl Check whether the given C compiler OPTION is accepted.
 476 dnl If so, enable the given Automake CONDITIONAL.
 477
 478 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 479 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 480   [OVS_CHECK_CC_OPTION(
 481     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 482    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 483 dnl ----------------------------------------------------------------------
 484
 485 dnl Check for too-old XenServer.
 486 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 487   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 488     [if test -e /etc/redhat-release; then
 489        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 490      fi
 491      if test -z "$ovs_cv_xsversion"; then
 492        ovs_cv_xsversion=none
 493      fi])
 494   case $ovs_cv_xsversion in
 495     none)
 496       ;;
 497
 498     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 499     [[6-9]]* |                           dnl XenServer 6 or later
 500     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 501     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 502     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 503     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 504       ;;
 505
 506     *)
 507       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.)])
 508       ;;
 509   esac])
 510
 511 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 512 dnl
 513 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 514 dnl Runs 'if-true' if so, 'if-false' otherwise.
 515 AC_DEFUN([OVS_CHECK_MAKE_IF],
 516   [AC_CACHE_CHECK(
 517      [whether ${MAKE-make} has GNU make \$(if) extension],
 518      [ovs_cv_gnu_make_if],
 519      [cat <<'EOF' > conftest.mk
 520 conftest.out:
 521         echo $(if x,y,z) > conftest.out
 522 .PHONY: all
 523 EOF
 524       rm -f conftest.out
 525       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 526       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 527       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 528       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 529       result=`cat conftest.out`
 530       rm -f conftest.mk conftest.out
 531       if test "X$result" = "Xy"; then
 532         ovs_cv_gnu_make_if=yes
 533       else
 534         ovs_cv_gnu_make_if=no
 535       fi])])
 536
 537 dnl OVS_CHECK_GNU_MAKE
 538 dnl
 539 dnl Checks whether make is GNU make (because Linux kernel Makefiles
 540 dnl only work with GNU make).
 541 AC_DEFUN([OVS_CHECK_GNU_MAKE],
 542   [AC_CACHE_CHECK(
 543      [whether ${MAKE-make} is GNU make],
 544      [ovs_cv_gnu_make],
 545      [rm -f conftest.out
 546       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
 547       ${MAKE-make} --version >conftest.out 2>&1
 548       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 549       result=`cat conftest.out`
 550       rm -f conftest.mk conftest.out
 551
 552       case $result in # (
 553         GNU*) ovs_cv_gnu_make=yes ;; # (
 554         *) ovs_cv_gnu_make=no ;;
 555       esac])
 556    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
 557
 558 dnl OVS_CHECK_SPARSE_TARGET
 559 dnl
 560 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 561 dnl target for which the code is being built.  This helps it out.
 562 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 563   [AC_CACHE_CHECK(
 564     [target hint for cgcc],
 565     [ac_cv_sparse_target],
 566     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 567        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 568        [x86_64-*], [ac_cv_sparse_target=x86_64],
 569        [ac_cv_sparse_target=other])])
 570    AS_CASE([$ac_cv_sparse_target],
 571      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 572      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 573      [SPARSEFLAGS= CGCCFLAGS=])
 574    AC_SUBST([SPARSEFLAGS])
 575    AC_SUBST([CGCCFLAGS])])
 576
 577 dnl OVS_SPARSE_EXTRA_INCLUDES
 578 dnl
 579 dnl The cgcc script from "sparse" does not search gcc's default
 580 dnl search path. Get the default search path from GCC and pass
 581 dnl them to sparse.
 582 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
 583     AC_SUBST([SPARSE_EXTRA_INCLUDES],
 584            [`$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 ' ' `] ))
 585
 586 dnl OVS_ENABLE_SPARSE
 587 AC_DEFUN([OVS_ENABLE_SPARSE],
 588   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 589    AC_REQUIRE([OVS_CHECK_MAKE_IF])
 590    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
 591    : ${SPARSE=sparse}
 592    AC_SUBST([SPARSE])
 593    AC_CONFIG_COMMANDS_PRE(
 594      [if test $ovs_cv_gnu_make_if = yes; then
 595         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
 596       fi])])
 597
 598 dnl OVS_PTHREAD_SET_NAME
 599 dnl
 600 dnl This checks for three known variants of pthreads functions for setting
 601 dnl the name of the current thread:
 602 dnl
 603 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
 604 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
 605 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
 606 dnl
 607 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
 608 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
 609 dnl provide to it.
 610 dnl
 611 dnl This macro defines:
 612 dnl
 613 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
 614 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
 615 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
 616 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
 617   [AC_CHECK_FUNCS([pthread_set_name_np])
 618    if test $ac_cv_func_pthread_set_name_np != yes; then
 619      AC_CACHE_CHECK(
 620        [for pthread_setname_np() variant],
 621        [ovs_cv_pthread_setname_np],
 622        [AC_LINK_IFELSE(
 623          [AC_LANG_PROGRAM([#include <pthread.h>
 624   ], [pthread_setname_np(pthread_self(), "name");])],
 625          [ovs_cv_pthread_setname_np=glibc],
 626          [AC_LINK_IFELSE(
 627            [AC_LANG_PROGRAM([#include <pthread.h>
 628 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
 629            [ovs_cv_pthread_setname_np=netbsd],
 630            [ovs_cv_pthread_setname_np=none])])])
 631      case $ovs_cv_pthread_setname_np in # (
 632        glibc)
 633           AC_DEFINE(
 634             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
 635             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
 636           ;; # (
 637        netbsd)
 638           AC_DEFINE(
 639             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
 640             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
 641           ;;
 642      esac
 643    fi])
 644
 645 dnl OVS_CHECK_LINUX_HOST.
 646 dnl
 647 dnl Checks whether we're building for a Linux host, based on the presence of
 648 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
 649 dnl LINUX based on the result.
 650 AC_DEFUN([OVS_CHECK_LINUX_HOST],
 651   [AC_CACHE_CHECK(
 652      [whether __linux__ is defined],
 653      [ovs_cv_linux],
 654      [AC_COMPILE_IFELSE(
 655         [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
 656         [ovs_cv_linux=true],
 657         [ovs_cv_linux=false])])
 658    AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])