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], [skb_cow_head])
 234   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 235                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 236   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 237                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 238   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 239                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 240   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 241
 242   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
 243                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
 244
 245   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 246                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 247   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 248                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 249
 250   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 251   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 252
 253   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
 254   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 255   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 256
 257   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
 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_ENABLE_SPARSE
 413 AC_DEFUN([OVS_ENABLE_SPARSE],
 414   [OVS_MAKE_HAS_IF(
 415      [AC_CONFIG_COMMANDS_PRE(
 416         [: ${SPARSE=sparse}
 417          AC_SUBST([SPARSE])
 418          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse" cgcc,'"$CC"')'])])])