[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 build directory])],
              [KBUILD26="$withval"], [KBUILD26=])dnl
  AC_ARG_WITH([l26-source],
              [AC_HELP_STRING([--with-l26-source=/path/to/linux-2.6-source],
                              [Specify the linux 2.6 kernel source directory
			       (usually figured out automatically from build
			       directory)])],
              [KSRC26="$withval"], [KSRC26=])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 $KBUILD26 gives us the "build" headers.
    # Use heuristics to find the source headers.
    AC_MSG_CHECKING([for Linux 2.6 source directory])
    if test -n "$KSRC26"; then
      KSRC26=`eval echo "$KSRC26"`
      case $KSRC26 in
          /*) ;;
          *) KSRC26=`pwd`/$KSRC26 ;;
      esac
      if test ! -e $KSRC26/include/linux/kernel.h; then
        AC_MSG_ERROR([$KSRC26 is not a kernel source directory)])
      fi
    else
      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
      fi
      if test ! -e $KSRC26/include/linux/kernel.h; then
        AC_MSG_ERROR([cannot find source directory (please use --with-l26-source)])
      fi
    fi
    AC_MSG_RESULT([$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 $KBUILD26 is not configured])
    fi
    OVS_CHECK_LINUX26_COMPAT
  elif test -n "$KSRC26"; then
    AC_MSG_ERROR([--with-l26-source may not be specified without --with-l26])
  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.
dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
dnl <REGEX> translated to uppercase.
AC_DEFUN([OVS_GREP_IFELSE], [
  AC_MSG_CHECKING([whether $2 matches in $1])
  if test -f $1; then
    grep '$2' $1 >/dev/null 2>&1
    status=$?
    case $status in
      0) 
        AC_MSG_RESULT([yes])
        m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
        ;;
      1) 
        AC_MSG_RESULT([no])
        $4
        ;;
      *) 
        AC_MSG_ERROR([grep exited with status $status])
        ;;
    esac
  else
    AC_MSG_RESULT([file not found])
    $4
  fi
])

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_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/arch/x86/include/asm/checksum_32.h], [src_err,],
                  [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])

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

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

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

  # 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([$KSRC26/include/linux/skbuff.h], [skb_dst(],
                  [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], 
                  [skb_copy_from_linear_data_offset])
  OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow_head])
  OVS_GREP_IFELSE([$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([$KSRC26/include/linux/string.h], [kmemdup], [],
                  [OVS_GREP_IFELSE([$KSRC26/include/linux/slab.h], [kmemdup])])

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

  OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_replace4])
  OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold])

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

  OVS_CHECK_LOG2_H

  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 $ovs_have_cc_option = yes])])
dnl ----------------------------------------------------------------------
Commit	Line	Data
064af421 BP	1	# -- autoconf --
064af421 BP	2
b57f675c	3	# Copyright (c) 2008, 2009, 2010 Nicira Networks.
064af421	4	#
a14bc59f BP	5	# Licensed under the Apache License, Version 2.0 (the "License");
	6	# you may not use this file except in compliance with the License.
	7	# You may obtain a copy of the License at:
064af421	8	#
a14bc59f BP	9	# http://www.apache.org/licenses/LICENSE-2.0
	10	#
	11	# Unless required by applicable law or agreed to in writing, software
	12	# distributed under the License is distributed on an "AS IS" BASIS,
	13	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	14	# See the License for the specific language governing permissions and
	15	# limitations under the License.
064af421	16
7c9e113b	17	dnl OVS_CHECK_LINUX26
064af421 BP	18	dnl
064af421 BP	19	dnl Configure linux kernel source tree
7c9e113b BP	20	AC_DEFUN([OVS_CHECK_LINUX26], [
	21	AC_ARG_WITH([l26],
	22	[AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
f5fb5de6	23	[Specify the linux 2.6 kernel build directory])],
7c9e113b	24	[KBUILD26="$withval"], [KBUILD26=])dnl
f5fb5de6 BP	25	AC_ARG_WITH([l26-source],
	26	[AC_HELP_STRING([--with-l26-source=/path/to/linux-2.6-source],
	27	[Specify the linux 2.6 kernel source directory
	28	(usually figured out automatically from build
	29	directory)])],
	30	[KSRC26="$withval"], [KSRC26=])dnl
7c9e113b BP	31	if test -n "$KBUILD26"; then
7c9e113b BP	32	KBUILD26=`eval echo "$KBUILD26"`
0b6d72fc BP	33	case $KBUILD26 in
	34	/*) ;;
	35	*) KBUILD26=`pwd`/$KBUILD26 ;;
	36	esac
064af421	37
7c9e113b BP	38	# The build directory is what the user provided.
	39	# Make sure that it exists.
	40	AC_MSG_CHECKING([for Linux 2.6 build directory])
	41	if test -d "$KBUILD26"; then
	42	AC_MSG_RESULT([$KBUILD26])
	43	AC_SUBST(KBUILD26)
064af421 BP	44	else
064af421 BP	45	AC_MSG_RESULT([no])
7c9e113b	46	AC_ERROR([source dir $KBUILD26 doesn't exist])
064af421 BP	47	fi
064af421 BP	48
7c9e113b BP	49	# Debian breaks kernel headers into "source" header and "build" headers.
	50	# We want the source headers, but $KBUILD26 gives us the "build" headers.
	51	# Use heuristics to find the source headers.
	52	AC_MSG_CHECKING([for Linux 2.6 source directory])
f5fb5de6 BP	53	if test -n "$KSRC26"; then
	54	KSRC26=`eval echo "$KSRC26"`
	55	case $KSRC26 in
	56	/*) ;;
	57	*) KSRC26=`pwd`/$KSRC26 ;;
b57f675c	58	esac
7c9e113b	59	if test ! -e $KSRC26/include/linux/kernel.h; then
f5fb5de6 BP	60	AC_MSG_ERROR([$KSRC26 is not a kernel source directory)])
	61	fi
	62	else
	63	KSRC26=$KBUILD26
	64	if test ! -e $KSRC26/include/linux/kernel.h; then
	65	case `echo "$KBUILD26" \| sed 's,/*$,,'` in # (
	66	*/build)
	67	KSRC26=`echo "$KBUILD26" \| sed 's,/build/*$,/source,'`
	68	;; # (
	69	*)
	70	KSRC26=`(cd $KBUILD26 && pwd -P) \| sed 's,-[[^-]]*$,-common,'`
	71	;;
	72	esac
	73	fi
	74	if test ! -e $KSRC26/include/linux/kernel.h; then
	75	AC_MSG_ERROR([cannot find source directory (please use --with-l26-source)])
7c9e113b BP	76	fi
	77	fi
	78	AC_MSG_RESULT([$KSRC26])
	79
	80	AC_MSG_CHECKING([for kernel version])
	81	patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
	82	sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
	83	if test -z "$patchlevel" \|\| test -z "$sublevel"; then
	84	AC_ERROR([cannot determine kernel version])
	85	fi
064af421	86	AC_MSG_RESULT([2.$patchlevel.$sublevel])
7c9e113b BP	87	if test "2.$patchlevel" != '2.6'; then
	88	if test "$BUILD26" = "$KSRC26"; then
	89	AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
	90	else
	91	AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
	92	fi
064af421	93	fi
e0510a6c BP	94	if test ! -e "$KBUILD26"/include/linux/version.h \|\| \
	95	(test ! -e "$KBUILD26"/include/linux/autoconf.h && \
	96	test ! -e "$KBUILD26"/include/generated/autoconf.h); then
7c9e113b	97	AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
064af421	98	fi
7c9e113b	99	OVS_CHECK_LINUX26_COMPAT
f5fb5de6 BP	100	elif test -n "$KSRC26"; then
f5fb5de6 BP	101	AC_MSG_ERROR([--with-l26-source may not be specified without --with-l26])
064af421	102	fi
7c9e113b	103	AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
064af421 BP	104	])
064af421 BP	105
8828e5c7	106	dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
064af421 BP	107	dnl
064af421 BP	108	dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
8828e5c7 BP	109	dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
8828e5c7 BP	110	dnl <REGEX> translated to uppercase.
064af421 BP	111	AC_DEFUN([OVS_GREP_IFELSE], [
064af421 BP	112	AC_MSG_CHECKING([whether $2 matches in $1])
7507ec48 JG	113	if test -f $1; then
	114	grep '$2' $1 >/dev/null 2>&1
	115	status=$?
	116	case $status in
	117	0)
	118	AC_MSG_RESULT([yes])
8828e5c7	119	m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
7507ec48 JG	120	;;
	121	1)
	122	AC_MSG_RESULT([no])
	123	$4
	124	;;
	125	*)
	126	AC_MSG_ERROR([grep exited with status $status])
	127	;;
	128	esac
	129	else
	130	AC_MSG_RESULT([file not found])
	131	$4
	132	fi
064af421 BP	133	])
	134
	135	dnl OVS_DEFINE(NAME)
	136	dnl
	137	dnl Defines NAME to 1 in kcompat.h.
	138	AC_DEFUN([OVS_DEFINE], [
	139	echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
	140	])
	141
064af421 BP	142	AC_DEFUN([OVS_CHECK_LOG2_H], [
	143	AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
	144	if test -e $KSRC26/include/linux/log2.h; then
	145	AC_MSG_RESULT([yes])
	146	OVS_DEFINE([HAVE_LOG2_H])
	147	else
	148	AC_MSG_RESULT([no])
	149	fi
	150	])
	151
	152	dnl OVS_CHECK_LINUX26_COMPAT
	153	dnl
	154	dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
7c9e113b	155	dnl the directory in $KBUILD26.
064af421 BP	156	AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
	157	rm -f datapath/linux-2.6/kcompat.h.new
	158	mkdir -p datapath/linux-2.6
	159	: > datapath/linux-2.6/kcompat.h.new
4aa13c0c	160
25fb3596 JG	161	OVS_GREP_IFELSE([$KSRC26/arch/x86/include/asm/checksum_32.h], [src_err,],
	162	[OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
	163
8828e5c7	164	OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST])
4aa13c0c	165
8828e5c7	166	OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast])
4aa13c0c	167
8828e5c7 BP	168	OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro])
8828e5c7 BP	169	OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_get_stats])
4aa13c0c	170
6a33828d BP	171	# Check for the proto_data_valid member in struct sk_buff. The [^@]
	172	# is necessary because some versions of this header remove the
	173	# member but retain the kerneldoc comment that describes it (which
	174	# starts with @). The brackets must be doubled because of m4
	175	# quoting rules.
	176	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
	177	[OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
4aa13c0c BP	178	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
4aa13c0c BP	179	[OVS_DEFINE([HAVE_MAC_RAW])])
85444c3f BP	180	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_dst(],
85444c3f BP	181	[OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
4aa13c0c	182	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
8828e5c7 BP	183	[skb_copy_from_linear_data_offset])
8828e5c7 BP	184	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow_head])
4aa13c0c BP	185	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
	186	[OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
	187	OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
	188	[OVS_DEFINE([HAVE_SKB_WARN_LRO])])
	189
8828e5c7 BP	190	OVS_GREP_IFELSE([$KSRC26/include/linux/string.h], [kmemdup], [],
8828e5c7 BP	191	[OVS_GREP_IFELSE([$KSRC26/include/linux/slab.h], [kmemdup])])
4aa13c0c BP	192
	193	OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
	194	[OVS_DEFINE([HAVE_BOOL_TYPE])])
e215ebca JG	195	OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [__wsum],
e215ebca JG	196	[OVS_DEFINE([HAVE_CSUM_TYPES])])
4aa13c0c	197
918097da	198	OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_replace4])
8828e5c7	199	OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold])
4aa13c0c	200
8828e5c7 BP	201	OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING])
8828e5c7 BP	202	OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16])
4aa13c0c	203
064af421	204	OVS_CHECK_LOG2_H
4aa13c0c	205
064af421 BP	206	if cmp -s datapath/linux-2.6/kcompat.h.new \
	207	datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
	208	rm datapath/linux-2.6/kcompat.h.new
	209	else
	210	mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
	211	fi
	212	])
	213
	214	dnl Checks for net/if_packet.h.
	215	AC_DEFUN([OVS_CHECK_IF_PACKET],
	216	[AC_CHECK_HEADER([net/if_packet.h],
	217	[HAVE_IF_PACKET=yes],
	218	[HAVE_IF_PACKET=no])
	219	AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
	220	if test "$HAVE_IF_PACKET" = yes; then
	221	AC_DEFINE([HAVE_IF_PACKET], [1],
	222	[Define to 1 if net/if_packet.h is available.])
	223	fi])
	224
e50097d2 BP	225	dnl Checks for buggy strtok_r.
	226	dnl
	227	dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
	228	dnl with optimization that can cause segfaults:
	229	dnl
	230	dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
	231	AC_DEFUN([OVS_CHECK_STRTOK_R],
	232	[AC_CACHE_CHECK(
	233	[whether strtok_r macro segfaults on some inputs],
	234	[ovs_cv_strtok_r_bug],
	235	[AC_RUN_IFELSE(
	236	[AC_LANG_PROGRAM([#include <stdio.h>
	237	#include <string.h>
	238	],
	239	[[char string[] = ":::";
	240	char save_ptr = (char ) 0xc0ffee;
	241	char token1, token2;
	242	token1 = strtok_r(string, ":", &save_ptr);
	243	token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd	244	freopen ("/dev/null", "w", stdout);
e50097d2 BP	245	printf ("%s %s\n", token1, token2);
	246	return 0;
	247	]])],
	248	[ovs_cv_strtok_r_bug=no],
	249	[ovs_cv_strtok_r_bug=yes],
	250	[ovs_cv_strtok_r_bug=yes])])
	251	if test $ovs_cv_strtok_r_bug = yes; then
	252	AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
	253	[Define if strtok_r macro segfaults on some inputs])
	254	fi
	255	])
	256
064af421 BP	257	dnl ----------------------------------------------------------------------
	258	dnl These macros are from GNU PSPP, with the following original license:
	259	dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
	260	dnl This file is free software; the Free Software Foundation
	261	dnl gives unlimited permission to copy and/or distribute it,
	262	dnl with or without modifications, as long as this notice is preserved.
	263
	264	dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
	265	dnl Check whether the given C compiler OPTION is accepted.
	266	dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
	267	AC_DEFUN([OVS_CHECK_CC_OPTION],
	268	[
	269	m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
	270	AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
	271	[ovs_save_CFLAGS="$CFLAGS"
	272	CFLAGS="$CFLAGS $1"
	273	AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
	274	CFLAGS="$ovs_save_CFLAGS"])
	275	if test $ovs_cv_name = yes; then
83f6c050	276	m4_if([$2], [], [:], [$2])
064af421 BP	277	else
	278	m4_if([$3], [], [:], [$3])
	279	fi
	280	])
	281
	282	dnl OVS_ENABLE_OPTION([OPTION])
	283	dnl Check whether the given C compiler OPTION is accepted.
d161c099	284	dnl If so, add it to WARNING_FLAGS.
064af421 BP	285	dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
064af421 BP	286	AC_DEFUN([OVS_ENABLE_OPTION],
d161c099 BP	287	[OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
d161c099 BP	288	AC_SUBST([WARNING_FLAGS])])
c72e245a BP	289
	290	dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
	291	dnl Check whether the given C compiler OPTION is accepted.
	292	dnl If so, enable the given Automake CONDITIONAL.
	293
	294	dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
	295	AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
	296	[OVS_CHECK_CC_OPTION(
	297	[$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
	298	AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421	299	dnl ----------------------------------------------------------------------