[mirror_ovs.git] / acinclude.m4

# -*- autoconf -*-

# Copyright (c) 2008, 2009, 2010 Nicira Networks.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

dnl OVS_CHECK_LINUX26
dnl
dnl Configure linux kernel source tree 
AC_DEFUN([OVS_CHECK_LINUX26], [
  AC_ARG_WITH([l26],
              [AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
                              [Specify the linux 2.6 kernel sources])],
              [KBUILD26="$withval"], [KBUILD26=])dnl
  if test -n "$KBUILD26"; then
    KBUILD26=`eval echo "$KBUILD26"`
    case $KBUILD26 in
        /*) ;;
        *) KBUILD26=`pwd`/$KBUILD26 ;;
    esac

    # The build directory is what the user provided.
    # Make sure that it exists.
    AC_MSG_CHECKING([for Linux 2.6 build directory])
    if test -d "$KBUILD26"; then
	AC_MSG_RESULT([$KBUILD26])
	AC_SUBST(KBUILD26)
    else
	AC_MSG_RESULT([no])
	AC_ERROR([source dir $KBUILD26 doesn't exist])
    fi

    # Debian breaks kernel headers into "source" header and "build" headers.
    # We want the source headers, but $KBUILD26 gives us the "build" headers.
    # Use heuristics to find the source headers.
    AC_MSG_CHECKING([for Linux 2.6 source directory])
    KSRC26=$KBUILD26
    if test ! -e $KSRC26/include/linux/kernel.h; then
      case `echo "$KBUILD26" | sed 's,/*$,,'` in # (
        */build)
          KSRC26=`echo "$KBUILD26" | sed 's,/build/*$,/source,'`
          ;; # (
        *)
          KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
          ;;
      esac
      if test ! -e $KSRC26/include/linux/kernel.h; then
        AC_MSG_ERROR([cannot find source directory])
      fi
    fi
    AC_MSG_RESULT([$KSRC26])

    AC_MSG_CHECKING([for kernel version])
    patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
    sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
    if test -z "$patchlevel" || test -z "$sublevel"; then
       AC_ERROR([cannot determine kernel version])
    fi
    AC_MSG_RESULT([2.$patchlevel.$sublevel])
    if test "2.$patchlevel" != '2.6'; then
       if test "$BUILD26" = "$KSRC26"; then
         AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
       else
         AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
       fi
    fi
    if test ! -e "$KBUILD26"/include/linux/version.h || \
       (test ! -e "$KBUILD26"/include/linux/autoconf.h && \
        test ! -e "$KBUILD26"/include/generated/autoconf.h); then
	AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
    fi
    OVS_CHECK_LINUX26_COMPAT
  fi
  AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
])

dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
dnl
dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
AC_DEFUN([OVS_GREP_IFELSE], [
  AC_MSG_CHECKING([whether $2 matches in $1])
  grep '$2' $1 >/dev/null 2>&1
  status=$?
  case $status in
    0) 
      AC_MSG_RESULT([yes])
      $3
      ;;
    1) 
      AC_MSG_RESULT([no])
      $4
      ;;
    *) 
      AC_MSG_ERROR([grep exited with status $status]) 
      ;;
  esac
])

dnl OVS_DEFINE(NAME)
dnl
dnl Defines NAME to 1 in kcompat.h.
AC_DEFUN([OVS_DEFINE], [
  echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
])

AC_DEFUN([OVS_CHECK_VETH], [
  AC_MSG_CHECKING([whether to build veth module])
  if test "$sublevel" = 18; then
    AC_MSG_RESULT([yes])
    AC_SUBST([BUILD_VETH], 1)
  else
    AC_MSG_RESULT([no])
  fi
])

AC_DEFUN([OVS_CHECK_LOG2_H], [
  AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
  if test -e $KSRC26/include/linux/log2.h; then
    AC_MSG_RESULT([yes])
    OVS_DEFINE([HAVE_LOG2_H])
  else
    AC_MSG_RESULT([no])
  fi
])

dnl OVS_CHECK_LINUX26_COMPAT
dnl
dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
dnl the directory in $KBUILD26.
AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
  rm -f datapath/linux-2.6/kcompat.h.new
  mkdir -p datapath/linux-2.6
  : > datapath/linux-2.6/kcompat.h.new

  OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
                  [OVS_DEFINE([HAVE_ERR_CAST])])

  OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
                  [OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])

  OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro],
                  [OVS_DEFINE([HAVE_DEV_DISABLE_LRO])])

  # Check for the proto_data_valid member in struct sk_buff.  The [^@]
  # is necessary because some versions of this header remove the
  # member but retain the kerneldoc comment that describes it (which
  # starts with @).  The brackets must be doubled because of m4
  # quoting rules.
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
                  [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
                  [OVS_DEFINE([HAVE_MAC_RAW])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], 
                  [skb_copy_from_linear_data_offset],
                  [OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow],
                  [OVS_DEFINE([HAVE_SKB_COW])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
                  [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
                  [OVS_DEFINE([HAVE_SKB_WARN_LRO])])

  OVS_GREP_IFELSE([$KSRC26/include/linux/string.h $KSRC26/include/linux/slab.h],
                  [kmemdup], [OVS_DEFINE([HAVE_KMEMDUP])])

  OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
                  [OVS_DEFINE([HAVE_BOOL_TYPE])])

  OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
                  [OVS_DEFINE([HAVE_CSUM_UNFOLD])])

  OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
                  [OVS_DEFINE([HAVE_NLA_NUL_STRING])])
  OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
                  [OVS_DEFINE([HAVE_NLA_GET_BE16])])

  OVS_CHECK_LOG2_H
  OVS_CHECK_VETH

  if cmp -s datapath/linux-2.6/kcompat.h.new \
            datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
    rm datapath/linux-2.6/kcompat.h.new
  else
    mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
  fi
])

dnl Checks for net/if_packet.h.
AC_DEFUN([OVS_CHECK_IF_PACKET],
  [AC_CHECK_HEADER([net/if_packet.h],
                   [HAVE_IF_PACKET=yes],
                   [HAVE_IF_PACKET=no])
   AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
   if test "$HAVE_IF_PACKET" = yes; then
      AC_DEFINE([HAVE_IF_PACKET], [1],
                [Define to 1 if net/if_packet.h is available.])
   fi])

dnl Checks for buggy strtok_r.
dnl
dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
dnl with optimization that can cause segfaults:
dnl
dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
AC_DEFUN([OVS_CHECK_STRTOK_R],
  [AC_CACHE_CHECK(
     [whether strtok_r macro segfaults on some inputs],
     [ovs_cv_strtok_r_bug],
     [AC_RUN_IFELSE(
        [AC_LANG_PROGRAM([#include <stdio.h>
                          #include <string.h>
                         ],
                         [[char string[] = ":::";
                           char *save_ptr = (char *) 0xc0ffee;
                           char *token1, *token2;
                           token1 = strtok_r(string, ":", &save_ptr);
                           token2 = strtok_r(NULL, ":", &save_ptr);
                           freopen ("/dev/null", "w", stdout);
                           printf ("%s %s\n", token1, token2);
                           return 0;
                          ]])],
        [ovs_cv_strtok_r_bug=no],
        [ovs_cv_strtok_r_bug=yes],
        [ovs_cv_strtok_r_bug=yes])])
   if test $ovs_cv_strtok_r_bug = yes; then
     AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
               [Define if strtok_r macro segfaults on some inputs])
   fi
])

dnl ----------------------------------------------------------------------
dnl These macros are from GNU PSPP, with the following original license:
dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
dnl Check whether the given C compiler OPTION is accepted.
dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
AC_DEFUN([OVS_CHECK_CC_OPTION],
[
  m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
  AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
    [ovs_save_CFLAGS="$CFLAGS"
     CFLAGS="$CFLAGS $1"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
     CFLAGS="$ovs_save_CFLAGS"])
  if test $ovs_cv_name = yes; then
    m4_if([$2], [], [:], [$2])
  else
    m4_if([$3], [], [:], [$3])
  fi
])

dnl OVS_ENABLE_OPTION([OPTION])
dnl Check whether the given C compiler OPTION is accepted.
dnl If so, add it to WARNING_FLAGS.
dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
AC_DEFUN([OVS_ENABLE_OPTION], 
  [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
   AC_SUBST([WARNING_FLAGS])])

dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
dnl Check whether the given C compiler OPTION is accepted.
dnl If so, enable the given Automake CONDITIONAL.

dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
  [OVS_CHECK_CC_OPTION(
    [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
   AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
dnl ----------------------------------------------------------------------
Commit	Line	Data
064af421 BP	1	# -- autoconf --
064af421 BP	2
b57f675c	3	# Copyright (c) 2008, 2009, 2010 Nicira Networks.
064af421	4	#
a14bc59f BP	5	# Licensed under the Apache License, Version 2.0 (the "License");
	6	# you may not use this file except in compliance with the License.
	7	# You may obtain a copy of the License at:
064af421	8	#
a14bc59f BP	9	# http://www.apache.org/licenses/LICENSE-2.0
	10	#
	11	# Unless required by applicable law or agreed to in writing, software
	12	# distributed under the License is distributed on an "AS IS" BASIS,
	13	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	14	# See the License for the specific language governing permissions and
	15	# limitations under the License.
064af421	16
7c9e113b	17	dnl OVS_CHECK_LINUX26
064af421 BP	18	dnl
064af421 BP	19	dnl Configure linux kernel source tree
7c9e113b BP	20	AC_DEFUN([OVS_CHECK_LINUX26], [
	21	AC_ARG_WITH([l26],
	22	[AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
	23	[Specify the linux 2.6 kernel sources])],
	24	[KBUILD26="$withval"], [KBUILD26=])dnl
	25	if test -n "$KBUILD26"; then
	26	KBUILD26=`eval echo "$KBUILD26"`
0b6d72fc BP	27	case $KBUILD26 in
	28	/*) ;;
	29	*) KBUILD26=`pwd`/$KBUILD26 ;;
	30	esac
064af421	31
7c9e113b BP	32	# The build directory is what the user provided.
	33	# Make sure that it exists.
	34	AC_MSG_CHECKING([for Linux 2.6 build directory])
	35	if test -d "$KBUILD26"; then
	36	AC_MSG_RESULT([$KBUILD26])
	37	AC_SUBST(KBUILD26)
064af421 BP	38	else
064af421 BP	39	AC_MSG_RESULT([no])
7c9e113b	40	AC_ERROR([source dir $KBUILD26 doesn't exist])
064af421 BP	41	fi
064af421 BP	42
7c9e113b BP	43	# Debian breaks kernel headers into "source" header and "build" headers.
	44	# We want the source headers, but $KBUILD26 gives us the "build" headers.
	45	# Use heuristics to find the source headers.
	46	AC_MSG_CHECKING([for Linux 2.6 source directory])
	47	KSRC26=$KBUILD26
	48	if test ! -e $KSRC26/include/linux/kernel.h; then
b57f675c BP	49	case `echo "$KBUILD26" \| sed 's,/*$,,'` in # (
	50	*/build)
	51	KSRC26=`echo "$KBUILD26" \| sed 's,/build/*$,/source,'`
	52	;; # (
	53	*)
	54	KSRC26=`(cd $KBUILD26 && pwd -P) \| sed 's,-[[^-]]*$,-common,'`
	55	;;
	56	esac
7c9e113b BP	57	if test ! -e $KSRC26/include/linux/kernel.h; then
	58	AC_MSG_ERROR([cannot find source directory])
	59	fi
	60	fi
	61	AC_MSG_RESULT([$KSRC26])
	62
	63	AC_MSG_CHECKING([for kernel version])
	64	patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
	65	sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
	66	if test -z "$patchlevel" \|\| test -z "$sublevel"; then
	67	AC_ERROR([cannot determine kernel version])
	68	fi
064af421	69	AC_MSG_RESULT([2.$patchlevel.$sublevel])
7c9e113b BP	70	if test "2.$patchlevel" != '2.6'; then
	71	if test "$BUILD26" = "$KSRC26"; then
	72	AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
	73	else
	74	AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
	75	fi
064af421	76	fi
e0510a6c BP	77	if test ! -e "$KBUILD26"/include/linux/version.h \|\| \
	78	(test ! -e "$KBUILD26"/include/linux/autoconf.h && \
	79	test ! -e "$KBUILD26"/include/generated/autoconf.h); then
7c9e113b	80	AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
064af421	81	fi
7c9e113b	82	OVS_CHECK_LINUX26_COMPAT
064af421	83	fi
7c9e113b	84	AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
064af421 BP	85	])
	86
	87	dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
	88	dnl
	89	dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
	90	AC_DEFUN([OVS_GREP_IFELSE], [
	91	AC_MSG_CHECKING([whether $2 matches in $1])
	92	grep '$2' $1 >/dev/null 2>&1
	93	status=$?
	94	case $status in
	95	0)
	96	AC_MSG_RESULT([yes])
	97	$3
	98	;;
	99	1)
	100	AC_MSG_RESULT([no])
	101	$4
	102	;;
	103	*)
	104	AC_MSG_ERROR([grep exited with status $status])
	105	;;
	106	esac
	107	])
	108
	109	dnl OVS_DEFINE(NAME)
	110	dnl
	111	dnl Defines NAME to 1 in kcompat.h.
	112	AC_DEFUN([OVS_DEFINE], [
	113	echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
	114	])
	115
	116	AC_DEFUN([OVS_CHECK_VETH], [
	117	AC_MSG_CHECKING([whether to build veth module])
	118	if test "$sublevel" = 18; then
	119	AC_MSG_RESULT([yes])
	120	AC_SUBST([BUILD_VETH], 1)
	121	else
	122	AC_MSG_RESULT([no])
	123	fi
	124	])
	125
	126	AC_DEFUN([OVS_CHECK_LOG2_H], [
	127	AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
	128	if test -e $KSRC26/include/linux/log2.h; then
	129	AC_MSG_RESULT([yes])
	130	OVS_DEFINE([HAVE_LOG2_H])
	131	else
	132	AC_MSG_RESULT([no])
	133	fi
	134	])
	135
	136	dnl OVS_CHECK_LINUX26_COMPAT
	137	dnl
	138	dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
7c9e113b	139	dnl the directory in $KBUILD26.
064af421 BP	140	AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
	141	rm -f datapath/linux-2.6/kcompat.h.new
	142	mkdir -p datapath/linux-2.6
	143	: > datapath/linux-2.6/kcompat.h.new
4aa13c0c	144
064af421 BP	145	OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
064af421 BP	146	[OVS_DEFINE([HAVE_ERR_CAST])])
4aa13c0c	147
8f3a29be JP	148	OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
8f3a29be JP	149	[OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
4aa13c0c	150
090847a3 JG	151	OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro],
090847a3 JG	152	[OVS_DEFINE([HAVE_DEV_DISABLE_LRO])])
4aa13c0c	153
6a33828d BP	154	# Check for the proto_data_valid member in struct sk_buff. The [^@]
	155	# is necessary because some versions of this header remove the
	156	# member but retain the kerneldoc comment that describes it (which
	157	# starts with @). The brackets must be doubled because of m4
	158	# quoting rules.
	159	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
	160	[OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
4aa13c0c BP	161	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
	162	[OVS_DEFINE([HAVE_MAC_RAW])])
	163	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
	164	[skb_copy_from_linear_data_offset],
	165	[OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
	166	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow],
	167	[OVS_DEFINE([HAVE_SKB_COW])])
	168	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
	169	[OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
	170	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
	171	[OVS_DEFINE([HAVE_SKB_WARN_LRO])])
	172
	173	OVS_GREP_IFELSE([$KSRC26/include/linux/string.h $KSRC26/include/linux/slab.h],
	174	[kmemdup], [OVS_DEFINE([HAVE_KMEMDUP])])
	175
	176	OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
	177	[OVS_DEFINE([HAVE_BOOL_TYPE])])
	178
	179	OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
	180	[OVS_DEFINE([HAVE_CSUM_UNFOLD])])
	181
	182	OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
	183	[OVS_DEFINE([HAVE_NLA_NUL_STRING])])
	184	OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
	185	[OVS_DEFINE([HAVE_NLA_GET_BE16])])
	186
064af421 BP	187	OVS_CHECK_LOG2_H
064af421 BP	188	OVS_CHECK_VETH
4aa13c0c	189
064af421 BP	190	if cmp -s datapath/linux-2.6/kcompat.h.new \
	191	datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
	192	rm datapath/linux-2.6/kcompat.h.new
	193	else
	194	mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
	195	fi
	196	])
	197
	198	dnl Checks for net/if_packet.h.
	199	AC_DEFUN([OVS_CHECK_IF_PACKET],
	200	[AC_CHECK_HEADER([net/if_packet.h],
	201	[HAVE_IF_PACKET=yes],
	202	[HAVE_IF_PACKET=no])
	203	AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
	204	if test "$HAVE_IF_PACKET" = yes; then
	205	AC_DEFINE([HAVE_IF_PACKET], [1],
	206	[Define to 1 if net/if_packet.h is available.])
	207	fi])
	208
e50097d2 BP	209	dnl Checks for buggy strtok_r.
	210	dnl
	211	dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
	212	dnl with optimization that can cause segfaults:
	213	dnl
	214	dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
	215	AC_DEFUN([OVS_CHECK_STRTOK_R],
	216	[AC_CACHE_CHECK(
	217	[whether strtok_r macro segfaults on some inputs],
	218	[ovs_cv_strtok_r_bug],
	219	[AC_RUN_IFELSE(
	220	[AC_LANG_PROGRAM([#include <stdio.h>
	221	#include <string.h>
	222	],
	223	[[char string[] = ":::";
	224	char save_ptr = (char ) 0xc0ffee;
	225	char token1, token2;
	226	token1 = strtok_r(string, ":", &save_ptr);
	227	token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd	228	freopen ("/dev/null", "w", stdout);
e50097d2 BP	229	printf ("%s %s\n", token1, token2);
	230	return 0;
	231	]])],
	232	[ovs_cv_strtok_r_bug=no],
	233	[ovs_cv_strtok_r_bug=yes],
	234	[ovs_cv_strtok_r_bug=yes])])
	235	if test $ovs_cv_strtok_r_bug = yes; then
	236	AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
	237	[Define if strtok_r macro segfaults on some inputs])
	238	fi
	239	])
	240
064af421 BP	241	dnl ----------------------------------------------------------------------
	242	dnl These macros are from GNU PSPP, with the following original license:
	243	dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
	244	dnl This file is free software; the Free Software Foundation
	245	dnl gives unlimited permission to copy and/or distribute it,
	246	dnl with or without modifications, as long as this notice is preserved.
	247
	248	dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
	249	dnl Check whether the given C compiler OPTION is accepted.
	250	dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
	251	AC_DEFUN([OVS_CHECK_CC_OPTION],
	252	[
	253	m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
	254	AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
	255	[ovs_save_CFLAGS="$CFLAGS"
	256	CFLAGS="$CFLAGS $1"
	257	AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
	258	CFLAGS="$ovs_save_CFLAGS"])
	259	if test $ovs_cv_name = yes; then
83f6c050	260	m4_if([$2], [], [:], [$2])
064af421 BP	261	else
	262	m4_if([$3], [], [:], [$3])
	263	fi
	264	])
	265
	266	dnl OVS_ENABLE_OPTION([OPTION])
	267	dnl Check whether the given C compiler OPTION is accepted.
d161c099	268	dnl If so, add it to WARNING_FLAGS.
064af421 BP	269	dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
064af421 BP	270	AC_DEFUN([OVS_ENABLE_OPTION],
d161c099 BP	271	[OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
d161c099 BP	272	AC_SUBST([WARNING_FLAGS])])
c72e245a BP	273
	274	dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
	275	dnl Check whether the given C compiler OPTION is accepted.
	276	dnl If so, enable the given Automake CONDITIONAL.
	277
	278	dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
	279	AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
	280	[OVS_CHECK_CC_OPTION(
	281	[$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
	282	AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421	283	dnl ----------------------------------------------------------------------