acinclude.m4

   1 # -*- autoconf -*-
   2
   3 # Copyright (c) 2008, 2009, 2010, 2011, 2012 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         # 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 "$version" -ge 3; then
 137        : # Linux 3.x
 138     elif test "$version" = 2 && test "$patchlevel" -ge 6; then
 139        : # Linux 2.6.x
 140     else
 141        if test "$KBUILD" = "$KSRC"; then
 142          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
 143        else
 144          AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
 145        fi
 146     fi
 147     if test ! -e "$KBUILD"/include/linux/version.h || \
 148        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
 149         test ! -e "$KBUILD"/include/generated/autoconf.h); then
 150         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
 151     fi
 152     OVS_CHECK_LINUX_COMPAT
 153   fi
 154   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
 155 ])
 156
 157 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
 158 dnl
 159 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
 160 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
 161 dnl <REGEX> translated to uppercase.
 162 AC_DEFUN([OVS_GREP_IFELSE], [
 163   AC_MSG_CHECKING([whether $2 matches in $1])
 164   if test -f $1; then
 165     grep '$2' $1 >/dev/null 2>&1
 166     status=$?
 167     case $status in
 168       0)
 169         AC_MSG_RESULT([yes])
 170         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
 171         ;;
 172       1)
 173         AC_MSG_RESULT([no])
 174         $4
 175         ;;
 176       *)
 177         AC_MSG_ERROR([grep exited with status $status])
 178         ;;
 179     esac
 180   else
 181     AC_MSG_RESULT([file not found])
 182     $4
 183   fi
 184 ])
 185
 186 dnl OVS_DEFINE(NAME)
 187 dnl
 188 dnl Defines NAME to 1 in kcompat.h.
 189 AC_DEFUN([OVS_DEFINE], [
 190   echo '#define $1 1' >> datapath/linux/kcompat.h.new
 191 ])
 192
 193 AC_DEFUN([OVS_CHECK_LOG2_H], [
 194   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
 195   if test -e $KSRC/include/linux/log2.h; then
 196     AC_MSG_RESULT([yes])
 197     OVS_DEFINE([HAVE_LOG2_H])
 198   else
 199     AC_MSG_RESULT([no])
 200   fi
 201 ])
 202
 203 dnl OVS_CHECK_LINUX_COMPAT
 204 dnl
 205 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
 206 dnl the directory in $KBUILD.
 207 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
 208   rm -f datapath/linux/kcompat.h.new
 209   mkdir -p datapath/linux
 210   : > datapath/linux/kcompat.h.new
 211
 212   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
 213                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
 214
 215   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
 216
 217   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
 218
 219   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
 220   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
 221   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
 222
 223   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
 224                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
 225                                    [rcu_read_lock_held])])
 226
 227   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
 228   # is necessary because some versions of this header remove the
 229   # member but retain the kerneldoc comment that describes it (which
 230   # starts with @).  The brackets must be doubled because of m4
 231   # quoting rules.
 232   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
 233                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
 234   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
 235                   [OVS_DEFINE([HAVE_MAC_RAW])])
 236   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
 237                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
 238   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 239                   [skb_copy_from_linear_data_offset])
 240   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
 241                   [skb_reset_tail_pointer])
 242   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
 243   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
 244                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
 245   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
 246                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
 247   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
 248                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
 249   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
 250
 251   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
 252                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
 253
 254   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
 255                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
 256   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
 257                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
 258
 259   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
 260   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
 261
 262   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
 263   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
 264   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
 265
 266   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
 267                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
 268
 269   OVS_CHECK_LOG2_H
 270
 271   if cmp -s datapath/linux/kcompat.h.new \
 272             datapath/linux/kcompat.h >/dev/null 2>&1; then
 273     rm datapath/linux/kcompat.h.new
 274   else
 275     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
 276   fi
 277 ])
 278
 279 dnl Checks for net/if_packet.h.
 280 AC_DEFUN([OVS_CHECK_IF_PACKET],
 281   [AC_CHECK_HEADER([net/if_packet.h],
 282                    [HAVE_IF_PACKET=yes],
 283                    [HAVE_IF_PACKET=no])
 284    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
 285    if test "$HAVE_IF_PACKET" = yes; then
 286       AC_DEFINE([HAVE_IF_PACKET], [1],
 287                 [Define to 1 if net/if_packet.h is available.])
 288    fi])
 289
 290 dnl Checks for buggy strtok_r.
 291 dnl
 292 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
 293 dnl with optimization that can cause segfaults:
 294 dnl
 295 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
 296 AC_DEFUN([OVS_CHECK_STRTOK_R],
 297   [AC_CACHE_CHECK(
 298      [whether strtok_r macro segfaults on some inputs],
 299      [ovs_cv_strtok_r_bug],
 300      [AC_RUN_IFELSE(
 301         [AC_LANG_PROGRAM([#include <stdio.h>
 302                           #include <string.h>
 303                          ],
 304                          [[char string[] = ":::";
 305                            char *save_ptr = (char *) 0xc0ffee;
 306                            char *token1, *token2;
 307                            token1 = strtok_r(string, ":", &save_ptr);
 308                            token2 = strtok_r(NULL, ":", &save_ptr);
 309                            freopen ("/dev/null", "w", stdout);
 310                            printf ("%s %s\n", token1, token2);
 311                            return 0;
 312                           ]])],
 313         [ovs_cv_strtok_r_bug=no],
 314         [ovs_cv_strtok_r_bug=yes],
 315         [ovs_cv_strtok_r_bug=yes])])
 316    if test $ovs_cv_strtok_r_bug = yes; then
 317      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
 318                [Define if strtok_r macro segfaults on some inputs])
 319    fi
 320 ])
 321
 322 dnl ----------------------------------------------------------------------
 323 dnl These macros are from GNU PSPP, with the following original license:
 324 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
 325 dnl This file is free software; the Free Software Foundation
 326 dnl gives unlimited permission to copy and/or distribute it,
 327 dnl with or without modifications, as long as this notice is preserved.
 328
 329 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
 330 dnl Check whether the given C compiler OPTION is accepted.
 331 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
 332 AC_DEFUN([OVS_CHECK_CC_OPTION],
 333 [
 334   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
 335   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
 336     [ovs_save_CFLAGS="$CFLAGS"
 337      CFLAGS="$CFLAGS $1"
 338      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
 339      CFLAGS="$ovs_save_CFLAGS"])
 340   if test $ovs_cv_name = yes; then
 341     m4_if([$2], [], [:], [$2])
 342   else
 343     m4_if([$3], [], [:], [$3])
 344   fi
 345 ])
 346
 347 dnl OVS_ENABLE_OPTION([OPTION])
 348 dnl Check whether the given C compiler OPTION is accepted.
 349 dnl If so, add it to WARNING_FLAGS.
 350 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
 351 AC_DEFUN([OVS_ENABLE_OPTION],
 352   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
 353    AC_SUBST([WARNING_FLAGS])])
 354
 355 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
 356 dnl Check whether the given C compiler OPTION is accepted.
 357 dnl If so, enable the given Automake CONDITIONAL.
 358
 359 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
 360 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
 361   [OVS_CHECK_CC_OPTION(
 362     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
 363    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
 364 dnl ----------------------------------------------------------------------
 365
 366 dnl Check for too-old XenServer.
 367 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
 368   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
 369     [if test -e /etc/redhat-release; then
 370        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
 371      fi
 372      if test -z "$ovs_cv_xsversion"; then
 373        ovs_cv_xsversion=none
 374      fi])
 375   case $ovs_cv_xsversion in
 376     none)
 377       ;;
 378
 379     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
 380     [[6-9]]* |                           dnl XenServer 6 or later
 381     5.[[7-9]]* |                         dnl XenServer 5.7 or later
 382     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
 383     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
 384     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
 385       ;;
 386
 387     *)
 388       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.)])
 389       ;;
 390   esac])
 391
 392 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
 393 dnl
 394 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
 395 dnl Runs 'if-true' if so, 'if-false' otherwise.
 396 AC_DEFUN([OVS_MAKE_HAS_IF],
 397   [AC_CACHE_CHECK(
 398      [whether ${MAKE-make} has GNU make \$(if) extension],
 399      [ovs_cv_gnu_make_if],
 400      [cat <<'EOF' > conftest.mk
 401 conftest.out:
 402         echo $(if x,y,z) > conftest.out
 403 .PHONY: all
 404 EOF
 405       rm -f conftest.out
 406       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
 407       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 408       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
 409       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
 410       result=`cat conftest.out`
 411       rm -f conftest.mk conftest.out
 412       if test "X$result" = "Xy"; then
 413         ovs_cv_gnu_make_if=yes
 414       else
 415         ovs_cv_gnu_make_if=no
 416       fi])
 417    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
 418
 419 dnl OVS_CHECK_SPARSE_TARGET
 420 dnl
 421 dnl The "cgcc" script from "sparse" isn't very good at detecting the
 422 dnl target for which the code is being built.  This helps it out.
 423 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
 424   [AC_CACHE_CHECK(
 425     [target hint for cgcc],
 426     [ac_cv_sparse_target],
 427     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
 428        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
 429        [x86_64-*], [ac_cv_sparse_target=x86_64],
 430        [ac_cv_sparse_target=other])])
 431    AS_CASE([$ac_cv_sparse_target],
 432      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
 433      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
 434      [SPARSEFLAGS= CGCCFLAGS=])
 435    AC_SUBST([SPARSEFLAGS])
 436    AC_SUBST([CGCCFLAGS])])
 437
 438 dnl OVS_ENABLE_SPARSE
 439 AC_DEFUN([OVS_ENABLE_SPARSE],
 440   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
 441    OVS_MAKE_HAS_IF(
 442      [AC_CONFIG_COMMANDS_PRE(
 443         [: ${SPARSE=sparse}
 444          AC_SUBST([SPARSE])
 445          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])