acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
   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 $KSRC/include/linux/kernel.h; then
 101         case `echo "$KBUILD" | sed 's,/*$,,'` in # (
 102           */build)
 103             KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
 104             ;; # (
 105           *)
 106             KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
 107             ;;
 108         esac
 109       fi
 110       if test ! -e $KSRC/include/linux/kernel.h; then
 111         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
 112       fi
 113     fi
 114     AC_MSG_RESULT([$KSRC])
 115
 116     AC_MSG_CHECKING([for kernel version])
 117     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
 118     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
 119     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
 120     if test X"$version" = X || test X"$patchlevel" = X; then
 121        AC_ERROR([cannot determine kernel version])
 122     elif test X"$sublevel" = X; then
 123        kversion=$version.$patchlevel
 124     else
 125        kversion=$version.$patchlevel.$sublevel
 126     fi
 127     AC_MSG_RESULT([$kversion])
 128
 129     if test "$version" -ge 3; then
 130        : # Linux 3.x
 131     elif test "$version" = 2 && test "$patchlevel" -ge 6; then
 132        : # Linux 2.6.x
 133     else
 134        if test "$KBUILD" = "$KSRC"; then
 135          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
 136        else
 137          AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
 138        fi
 139     fi
 140     if test ! -e "$KBUILD"/include/linux/version.h || \
 141        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 142         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 143         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 144     fi
 145     OVS_CHECK_LINUX_COMPAT
 146   fi
 147   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 148 ])
 149
 150 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 151 dnl
 152 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 153 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 154 dnl <REGEX> translated to uppercase.
 155 AC_DEFUN([OVS_GREP_IFELSE], [
 156   AC_MSG_CHECKING([whether $2 matches in $1])
 157   if test -f $1; then
 158     grep '$2' $1 >/dev/null 2>&1
 159     status=$?
 160     case $status in
 161       0)
 162         AC_MSG_RESULT([yes])
 163         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 164         ;;
 165       1)
 166         AC_MSG_RESULT([no])
 167         $4
 168         ;;
 169       *)
 170         AC_MSG_ERROR([grep exited with status $status])
 171         ;;
 172     esac
 173   else
 174     AC_MSG_RESULT([file not found])
 175     $4
 176   fi
 177 ])
 178
 179 dnl OVS_DEFINE(NAME)
 180 dnl
 181 dnl Defines NAME to 1 in kcompat.h.
 182 AC_DEFUN([OVS_DEFINE], [
 183   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 184 ])
 185
 186 AC_DEFUN([OVS_CHECK_LOG2_H], [
 187   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
 188   if test -e $KSRC/include/linux/log2.h; then
 189     AC_MSG_RESULT([yes])
 190     OVS_DEFINE([HAVE_LOG2_H])
 191   else
 192     AC_MSG_RESULT([no])
 193   fi
 194 ])
 195
 196 dnl OVS_CHECK_LINUX_COMPAT
 197 dnl
 198 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 199 dnl the directory in $KBUILD.
 200 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 201   rm -f datapath/linux/kcompat.h.new
 202   mkdir -p datapath/linux
 203   : > datapath/linux/kcompat.h.new
 204
 205   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 206                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 207
 208   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 209
 210   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 211
 212   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 213   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 214   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 215
 216   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 217                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 218                                    [rcu_read_lock_held])])
 219
 220   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 221   # is necessary because some versions of this header remove the
 222   # member but retain the kerneldoc comment that describes it (which
 223   # starts with @).  The brackets must be doubled because of m4
 224   # quoting rules.
 225   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 226                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 227   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
 228                   [OVS_DEFINE([HAVE_MAC_RAW])])
 229   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 230                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 231   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 232                   [skb_copy_from_linear_data_offset])
 233   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 234                   [skb_reset_tail_pointer])
 235   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 236   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 237                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 238   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 239                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 240   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 241                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 242   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 243
 244   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
 245                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
 246
 247   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 248                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 249   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 250                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 251
 252   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 253   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 254
 255   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
 256   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 257   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 258
 259   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 260                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 261
 262   OVS_CHECK_LOG2_H
 263
 264   if cmp -s datapath/linux/kcompat.h.new \
 265             datapath/linux/kcompat.h >/dev/null 2>&1; then
 266     rm datapath/linux/kcompat.h.new
 267   else
 268     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 269   fi
 270 ])
 271
 272 dnl Checks for net/if_packet.h.
 273 AC_DEFUN([OVS_CHECK_IF_PACKET],
 274   [AC_CHECK_HEADER([net/if_packet.h],
 275                    [HAVE_IF_PACKET=yes],
 276                    [HAVE_IF_PACKET=no])
 277    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 278    if test "$HAVE_IF_PACKET" = yes; then
 279       AC_DEFINE([HAVE_IF_PACKET], [1],
 280                 [Define to 1 if net/if_packet.h is available.])
 281    fi])
 282
 283 dnl Checks for buggy strtok_r.
 284 dnl
 285 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 286 dnl with optimization that can cause segfaults:
 287 dnl
 288 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 289 AC_DEFUN([OVS_CHECK_STRTOK_R],
 290   [AC_CACHE_CHECK(
 291      [whether strtok_r macro segfaults on some inputs],
 292      [ovs_cv_strtok_r_bug],
 293      [AC_RUN_IFELSE(
 294         [AC_LANG_PROGRAM([#include <stdio.h>
 295                           #include <string.h>
 296                          ],
 297                          [[char string[] = ":::";
 298                            char *save_ptr = (char *) 0xc0ffee;
 299                            char *token1, *token2;
 300                            token1 = strtok_r(string, ":", &save_ptr);
 301                            token2 = strtok_r(NULL, ":", &save_ptr);
 302                            freopen ("/dev/null", "w", stdout);
 303                            printf ("%s %s\n", token1, token2);
 304                            return 0;
 305                           ]])],
 306         [ovs_cv_strtok_r_bug=no],
 307         [ovs_cv_strtok_r_bug=yes],
 308         [ovs_cv_strtok_r_bug=yes])])
 309    if test $ovs_cv_strtok_r_bug = yes; then
 310      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 311                [Define if strtok_r macro segfaults on some inputs])
 312    fi
 313 ])
 314
 315 dnl ----------------------------------------------------------------------
 316 dnl These macros are from GNU PSPP, with the following original license:
 317 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 318 dnl This file is free software; the Free Software Foundation
 319 dnl gives unlimited permission to copy and/or distribute it,
 320 dnl with or without modifications, as long as this notice is preserved.
 321
 322 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 323 dnl Check whether the given C compiler OPTION is accepted.
 324 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 325 AC_DEFUN([OVS_CHECK_CC_OPTION],
 326 [
 327   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
 328   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 329     [ovs_save_CFLAGS="$CFLAGS"
 330      CFLAGS="$CFLAGS $1"
 331      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 332      CFLAGS="$ovs_save_CFLAGS"])
 333   if test $ovs_cv_name = yes; then
 334     m4_if([$2], [], [:], [$2])
 335   else
 336     m4_if([$3], [], [:], [$3])
 337   fi
 338 ])
 339
 340 dnl OVS_ENABLE_OPTION([OPTION])
 341 dnl Check whether the given C compiler OPTION is accepted.
 342 dnl If so, add it to WARNING_FLAGS.
 343 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 344 AC_DEFUN([OVS_ENABLE_OPTION],
 345   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 346    AC_SUBST([WARNING_FLAGS])])
 347
 348 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 349 dnl Check whether the given C compiler OPTION is accepted.
 350 dnl If so, enable the given Automake CONDITIONAL.
 351
 352 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 353 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 354   [OVS_CHECK_CC_OPTION(
 355     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 356    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 357 dnl ----------------------------------------------------------------------
 358
 359 dnl Check for too-old XenServer.
 360 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 361   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 362     [if test -e /etc/redhat-release; then
 363        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 364      fi
 365      if test -z "$ovs_cv_xsversion"; then
 366        ovs_cv_xsversion=none
 367      fi])
 368   case $ovs_cv_xsversion in
 369     none)
 370       ;;
 371
 372     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 373     [[6-9]]* |                           dnl XenServer 6 or later
 374     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 375     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 376     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 377     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 378       ;;
 379
 380     *)
 381       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.)])
 382       ;;
 383   esac])
 384
 385 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 386 dnl
 387 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 388 dnl Runs 'if-true' if so, 'if-false' otherwise.
 389 AC_DEFUN([OVS_MAKE_HAS_IF],
 390   [AC_CACHE_CHECK(
 391      [whether ${MAKE-make} has GNU make \$(if) extension],
 392      [ovs_cv_gnu_make_if],
 393      [cat <<'EOF' > conftest.mk
 394 conftest.out:
 395         echo $(if x,y,z) > conftest.out
 396 .PHONY: all
 397 EOF
 398       rm -f conftest.out
 399       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 400       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 401       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 402       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 403       result=`cat conftest.out`
 404       rm -f conftest.mk conftest.out
 405       if test "X$result" = "Xy"; then
 406         ovs_cv_gnu_make_if=yes
 407       else
 408         ovs_cv_gnu_make_if=no
 409       fi])
 410    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
 411
 412 dnl OVS_CHECK_SPARSE_TARGET
 413 dnl
 414 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 415 dnl target for which the code is being built.  This helps it out.
 416 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 417   [AC_CACHE_CHECK(
 418     [target hint for cgcc],
 419     [ac_cv_sparse_target],
 420     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 421        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 422        [x86_64-*], [ac_cv_sparse_target=x86_64],
 423        [ac_cv_sparse_target=other])])
 424    AS_CASE([$ac_cv_sparse_target],
 425      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 426      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 427      [SPARSEFLAGS= CGCCFLAGS=])
 428    AC_SUBST([SPARSEFLAGS])
 429    AC_SUBST([CGCCFLAGS])])
 430
 431 dnl OVS_ENABLE_SPARSE
 432 AC_DEFUN([OVS_ENABLE_SPARSE],
 433   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 434    OVS_MAKE_HAS_IF(
 435      [AC_CONFIG_COMMANDS_PRE(
 436         [: ${SPARSE=sparse}
 437          AC_SUBST([SPARSE])
 438          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])