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