[mirror_ovs.git] / acinclude.m4

# -*- autoconf -*-

# Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
#
# 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_ENABLE_WERROR
AC_DEFUN([OVS_ENABLE_WERROR],
  [AC_ARG_ENABLE(
     [Werror],
     [AC_HELP_STRING([--enable-Werror], [Add -Werror to CFLAGS])],
     [], [enable_Werror=no])
   AC_CONFIG_COMMANDS_PRE(
     [if test "X$enable_Werror" = Xyes; then
        CFLAGS="$CFLAGS -Werror"
      fi])])

dnl OVS_CHECK_LINUX
dnl
dnl Configure linux kernel source tree 
AC_DEFUN([OVS_CHECK_LINUX], [
  AC_ARG_WITH([linux],
              [AC_HELP_STRING([--with-linux=/path/to/linux],
                              [Specify the Linux kernel build directory])])
  AC_ARG_WITH([linux-source],
              [AC_HELP_STRING([--with-linux-source=/path/to/linux-source],
                              [Specify the Linux kernel source directory
			       (usually figured out automatically from build
			       directory)])])

  # Deprecated equivalents to --with-linux, --with-linux-source.
  AC_ARG_WITH([l26])
  AC_ARG_WITH([l26-source])

  if test X"$with_linux" != X; then
    KBUILD=$with_linux
  elif test X"$with_l26" != X; then
    KBUILD=$with_l26
    AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
  else
    KBUILD=
  fi

  if test X"$KBUILD" != X; then
    if test X"$with_linux_source" != X; then
      KSRC=$with_linux_source
    elif test X"$with_l26_source" != X; then
      KSRC=$with_l26_source
      AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
    else
      KSRC=
    fi
  elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
    AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
  fi

  if test -n "$KBUILD"; then
    KBUILD=`eval echo "$KBUILD"`
    case $KBUILD in
        /*) ;;
        *) KBUILD=`pwd`/$KBUILD ;;
    esac

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

    # Debian breaks kernel headers into "source" header and "build" headers.
    # We want the source headers, but $KBUILD gives us the "build" headers.
    # Use heuristics to find the source headers.
    AC_MSG_CHECKING([for Linux source directory])
    if test -n "$KSRC"; then
      KSRC=`eval echo "$KSRC"`
      case $KSRC in
          /*) ;;
          *) KSRC=`pwd`/$KSRC ;;
      esac
      if test ! -e $KSRC/include/linux/kernel.h; then
        AC_MSG_ERROR([$KSRC is not a kernel source directory])
      fi
    else
      KSRC=$KBUILD
      if test ! -e $KSRC/include/linux/kernel.h; then
        # Debian kernel build Makefiles tend to include a line of the form:
        # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
        # First try to extract the source directory from this line.
        KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
        if test ! -e "$KSRC"/include/linux/kernel.h; then
          # Didn't work.  Fall back to name-based heuristics that used to work.
          case `echo "$KBUILD" | sed 's,/*$,,'` in # (
            */build)
              KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
              ;; # (
            *)
              KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
              ;;
          esac
        fi
      fi
      if test ! -e "$KSRC"/include/linux/kernel.h; then
        AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
      fi
    fi
    AC_MSG_RESULT([$KSRC])

    AC_MSG_CHECKING([for kernel version])
    version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
    patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
    sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
    if test X"$version" = X || test X"$patchlevel" = X; then
       AC_ERROR([cannot determine kernel version])
    elif test X"$sublevel" = X; then
       kversion=$version.$patchlevel
    else
       kversion=$version.$patchlevel.$sublevel
    fi
    AC_MSG_RESULT([$kversion])

    if test "$version" -ge 3; then
       : # Linux 3.x
    elif test "$version" = 2 && test "$patchlevel" -ge 6; then
       : # Linux 2.6.x
    else
       if test "$KBUILD" = "$KSRC"; then
         AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
       else
         AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
       fi
    fi
    if test ! -e "$KBUILD"/include/linux/version.h || \
       (test ! -e "$KBUILD"/include/linux/autoconf.h && \
        test ! -e "$KBUILD"/include/generated/autoconf.h); then
	AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
    fi
    OVS_CHECK_LINUX_COMPAT
  fi
  AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
])

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/kcompat.h.new
])

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

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

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

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

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

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

  OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
                  [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
                                   [rcu_read_lock_held])])
  
  # 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([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
                  [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
                  [OVS_DEFINE([HAVE_MAC_RAW])])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
                  [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], 
                  [skb_copy_from_linear_data_offset])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
                  [skb_reset_tail_pointer])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
                  [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
  OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
                  [OVS_DEFINE([HAVE_ICMP6_HDR])])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
                  [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
  OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])

  OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
                  [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])

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

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

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

  OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
                  [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])

  OVS_CHECK_LOG2_H

  if cmp -s datapath/linux/kcompat.h.new \
            datapath/linux/kcompat.h >/dev/null 2>&1; then
    rm datapath/linux/kcompat.h.new
  else
    mv datapath/linux/kcompat.h.new datapath/linux/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 net/if_dl.h.
AC_DEFUN([OVS_CHECK_IF_DL],
  [AC_CHECK_HEADER([net/if_dl.h],
                   [HAVE_IF_DL=yes],
                   [HAVE_IF_DL=no])
   AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
   if test "$HAVE_IF_DL" = yes; then
      AC_DEFINE([HAVE_IF_DL], [1],
                [Define to 1 if net/if_dl.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 ----------------------------------------------------------------------

dnl Check for too-old XenServer.
AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
  [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
    [if test -e /etc/redhat-release; then
       ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
     fi
     if test -z "$ovs_cv_xsversion"; then
       ovs_cv_xsversion=none
     fi])
  case $ovs_cv_xsversion in
    none)
      ;;

    [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
    [[6-9]]* |                           dnl XenServer 6 or later
    5.[[7-9]]* |                         dnl XenServer 5.7 or later
    5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
    5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
    5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
      ;;

    *)
      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.)])
      ;;
  esac])

dnl OVS_MAKE_HAS_IF([if-true], [if-false])
dnl
dnl Checks whether make has the GNU make $(if condition,then,else) extension.
dnl Runs 'if-true' if so, 'if-false' otherwise.
AC_DEFUN([OVS_CHECK_MAKE_IF],
  [AC_CACHE_CHECK(
     [whether ${MAKE-make} has GNU make \$(if) extension],
     [ovs_cv_gnu_make_if],
     [cat <<'EOF' > conftest.mk
conftest.out:
	echo $(if x,y,z) > conftest.out
.PHONY: all
EOF
      rm -f conftest.out
      AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
      ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
      AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
      cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
      result=`cat conftest.out`
      rm -f conftest.mk conftest.out
      if test "X$result" = "Xy"; then
        ovs_cv_gnu_make_if=yes
      else
        ovs_cv_gnu_make_if=no
      fi])])

dnl OVS_CHECK_GNU_MAKE
dnl
dnl Checks whether make is GNU make (because Linux kernel Makefiles
dnl only work with GNU make).
AC_DEFUN([OVS_CHECK_GNU_MAKE],
  [AC_CACHE_CHECK(
     [whether ${MAKE-make} is GNU make],
     [ovs_cv_gnu_make],
     [rm -f conftest.out
      AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
      ${MAKE-make} --version >conftest.out 2>&1
      cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
      result=`cat conftest.out`
      rm -f conftest.mk conftest.out

      case $result in # (
        GNU*) ovs_cv_gnu_make=yes ;; # (
        *) ovs_cv_gnu_make=no ;;
      esac])
   AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])

dnl OVS_CHECK_SPARSE_TARGET
dnl
dnl The "cgcc" script from "sparse" isn't very good at detecting the
dnl target for which the code is being built.  This helps it out.
AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
  [AC_CACHE_CHECK(
    [target hint for cgcc],
    [ac_cv_sparse_target],
    [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
       [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
       [x86_64-*], [ac_cv_sparse_target=x86_64],
       [ac_cv_sparse_target=other])])
   AS_CASE([$ac_cv_sparse_target],
     [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
     [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
     [SPARSEFLAGS= CGCCFLAGS=])
   AC_SUBST([SPARSEFLAGS])
   AC_SUBST([CGCCFLAGS])])

dnl OVS_ENABLE_SPARSE
AC_DEFUN([OVS_ENABLE_SPARSE],
  [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
   AC_REQUIRE([OVS_CHECK_MAKE_IF])
   : ${SPARSE=sparse}
   AC_SUBST([SPARSE])
   AC_CONFIG_COMMANDS_PRE(
     [if test $ovs_cv_gnu_make_if = yes; then
        CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'
      fi])])
Commit	Line	Data
064af421 BP	1	# -- autoconf --
064af421 BP	2
e0edde6f	3	# Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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
a64e37a1 BP	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
e3438006	28	dnl OVS_CHECK_LINUX
064af421 BP	29	dnl
064af421 BP	30	dnl Configure linux kernel source tree
e3438006	31	AC_DEFUN([OVS_CHECK_LINUX], [
8a2d6596 BP	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
f5fb5de6	38	(usually figured out automatically from build
8a2d6596 BP	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=$with_l26_source
	59	AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
0a89c170 BP	60	else
0a89c170 BP	61	KSRC=
8a2d6596 BP	62	fi
	63	elif test X"$with_linux_source" != X \|\| test X"$with_l26_source" != X; then
	64	AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
	65	fi
	66
e3438006 BP	67	if test -n "$KBUILD"; then
	68	KBUILD=`eval echo "$KBUILD"`
	69	case $KBUILD in
0b6d72fc	70	/*) ;;
e3438006	71	*) KBUILD=`pwd`/$KBUILD ;;
0b6d72fc	72	esac
064af421	73
7c9e113b BP	74	# The build directory is what the user provided.
7c9e113b BP	75	# Make sure that it exists.
8a2d6596	76	AC_MSG_CHECKING([for Linux build directory])
e3438006 BP	77	if test -d "$KBUILD"; then
	78	AC_MSG_RESULT([$KBUILD])
	79	AC_SUBST(KBUILD)
064af421 BP	80	else
064af421 BP	81	AC_MSG_RESULT([no])
e3438006	82	AC_ERROR([source dir $KBUILD doesn't exist])
064af421 BP	83	fi
064af421 BP	84
7c9e113b	85	# Debian breaks kernel headers into "source" header and "build" headers.
e3438006	86	# We want the source headers, but $KBUILD gives us the "build" headers.
7c9e113b	87	# Use heuristics to find the source headers.
8a2d6596	88	AC_MSG_CHECKING([for Linux source directory])
e3438006 BP	89	if test -n "$KSRC"; then
	90	KSRC=`eval echo "$KSRC"`
	91	case $KSRC in
f5fb5de6	92	/*) ;;
e3438006	93	*) KSRC=`pwd`/$KSRC ;;
b57f675c	94	esac
e3438006	95	if test ! -e $KSRC/include/linux/kernel.h; then
53319f95	96	AC_MSG_ERROR([$KSRC is not a kernel source directory])
f5fb5de6 BP	97	fi
f5fb5de6 BP	98	else
e3438006 BP	99	KSRC=$KBUILD
e3438006 BP	100	if test ! -e $KSRC/include/linux/kernel.h; then
fe0731b1 BP	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
f5fb5de6	116	fi
fe0731b1	117	if test ! -e "$KSRC"/include/linux/kernel.h; then
8a2d6596	118	AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
7c9e113b BP	119	fi
7c9e113b BP	120	fi
e3438006	121	AC_MSG_RESULT([$KSRC])
7c9e113b BP	122
7c9e113b BP	123	AC_MSG_CHECKING([for kernel version])
71fe9970	124	version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
e3438006 BP	125	patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
e3438006 BP	126	sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
71fe9970	127	if test X"$version" = X \|\| test X"$patchlevel" = X; then
7c9e113b	128	AC_ERROR([cannot determine kernel version])
71fe9970 BP	129	elif test X"$sublevel" = X; then
	130	kversion=$version.$patchlevel
	131	else
	132	kversion=$version.$patchlevel.$sublevel
7c9e113b	133	fi
71fe9970 BP	134	AC_MSG_RESULT([$kversion])
	135
	136	if test "$version" -ge 3; then
	137	: # Linux 3.x
	138	elif test "$version" = 2 && test "$patchlevel" -ge 6; then
	139	: # Linux 2.6.x
	140	else
e3438006	141	if test "$KBUILD" = "$KSRC"; then
71fe9970	142	AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
7c9e113b	143	else
71fe9970	144	AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
7c9e113b	145	fi
064af421	146	fi
e3438006 BP	147	if test ! -e "$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 $KBUILD is not configured])
064af421	151	fi
e3438006	152	OVS_CHECK_LINUX_COMPAT
064af421	153	fi
e3438006	154	AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
064af421 BP	155	])
064af421 BP	156
8828e5c7	157	dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
064af421 BP	158	dnl
064af421 BP	159	dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
8828e5c7 BP	160	dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
8828e5c7 BP	161	dnl <REGEX> translated to uppercase.
064af421 BP	162	AC_DEFUN([OVS_GREP_IFELSE], [
064af421 BP	163	AC_MSG_CHECKING([whether $2 matches in $1])
7507ec48 JG	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])
8828e5c7	170	m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
7507ec48 JG	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
064af421 BP	184	])
	185
	186	dnl OVS_DEFINE(NAME)
	187	dnl
	188	dnl Defines NAME to 1 in kcompat.h.
	189	AC_DEFUN([OVS_DEFINE], [
22bcc0e7	190	echo '#define $1 1' >> datapath/linux/kcompat.h.new
064af421 BP	191	])
064af421 BP	192
064af421	193	AC_DEFUN([OVS_CHECK_LOG2_H], [
e3438006 BP	194	AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
e3438006 BP	195	if test -e $KSRC/include/linux/log2.h; then
064af421 BP	196	AC_MSG_RESULT([yes])
	197	OVS_DEFINE([HAVE_LOG2_H])
	198	else
	199	AC_MSG_RESULT([no])
	200	fi
	201	])
	202
e3438006	203	dnl OVS_CHECK_LINUX_COMPAT
064af421 BP	204	dnl
064af421 BP	205	dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
e3438006 BP	206	dnl the directory in $KBUILD.
e3438006 BP	207	AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
22bcc0e7 JG	208	rm -f datapath/linux/kcompat.h.new
	209	mkdir -p datapath/linux
	210	: > datapath/linux/kcompat.h.new
4aa13c0c	211
e3438006	212	OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
25fb3596 JG	213	[OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
25fb3596 JG	214
e3438006	215	OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
4aa13c0c	216
e3438006	217	OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
4aa13c0c	218
e3438006 BP	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([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
4aa13c0c	222
e3438006 BP	223	OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
e3438006 BP	224	[OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
cf6cb3a2 JG	225	[rcu_read_lock_held])])
cf6cb3a2 JG	226
6a33828d BP	227	# Check for the proto_data_valid member in struct sk_buff. The [^@]
	228	# is necessary because some versions of this header remove the
	229	# member but retain the kerneldoc comment that describes it (which
	230	# starts with @). The brackets must be doubled because of m4
	231	# quoting rules.
e3438006	232	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
6a33828d	233	[OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
e3438006	234	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
4aa13c0c	235	[OVS_DEFINE([HAVE_MAC_RAW])])
e3438006	236	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
85444c3f	237	[OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
e3438006	238	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
8828e5c7	239	[skb_copy_from_linear_data_offset])
b9c15df9 PS	240	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
b9c15df9 PS	241	[skb_reset_tail_pointer])
e3438006 BP	242	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
e3438006 BP	243	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
4aa13c0c	244	[OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
e3438006	245	OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
d31f1109	246	[OVS_DEFINE([HAVE_ICMP6_HDR])])
e3438006	247	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
4aa13c0c	248	[OVS_DEFINE([HAVE_SKB_WARN_LRO])])
e3438006	249	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
6c4ea27c	250	OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
4aa13c0c	251
e3438006 BP	252	OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
e3438006 BP	253	[OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
4aa13c0c	254
e3438006	255	OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
4aa13c0c	256	[OVS_DEFINE([HAVE_BOOL_TYPE])])
e3438006	257	OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
e215ebca	258	[OVS_DEFINE([HAVE_CSUM_TYPES])])
4aa13c0c	259
e3438006 BP	260	OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
e3438006 BP	261	OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
4aa13c0c	262
e3438006 BP	263	OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
	264	OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
	265	OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
4aa13c0c	266
e3438006	267	OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
431488e6 BP	268	[OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
431488e6 BP	269
064af421	270	OVS_CHECK_LOG2_H
4aa13c0c	271
22bcc0e7 JG	272	if cmp -s datapath/linux/kcompat.h.new \
	273	datapath/linux/kcompat.h >/dev/null 2>&1; then
	274	rm datapath/linux/kcompat.h.new
064af421	275	else
22bcc0e7	276	mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
064af421 BP	277	fi
	278	])
	279
	280	dnl Checks for net/if_packet.h.
	281	AC_DEFUN([OVS_CHECK_IF_PACKET],
	282	[AC_CHECK_HEADER([net/if_packet.h],
	283	[HAVE_IF_PACKET=yes],
	284	[HAVE_IF_PACKET=no])
	285	AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
	286	if test "$HAVE_IF_PACKET" = yes; then
	287	AC_DEFINE([HAVE_IF_PACKET], [1],
	288	[Define to 1 if net/if_packet.h is available.])
	289	fi])
	290
f6eb6b20	291	dnl Checks for net/if_dl.h.
9360d9b7 EM	292	AC_DEFUN([OVS_CHECK_IF_DL],
	293	[AC_CHECK_HEADER([net/if_dl.h],
	294	[HAVE_IF_DL=yes],
	295	[HAVE_IF_DL=no])
	296	AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
	297	if test "$HAVE_IF_DL" = yes; then
	298	AC_DEFINE([HAVE_IF_DL], [1],
	299	[Define to 1 if net/if_dl.h is available.])
	300	fi])
	301
e50097d2 BP	302	dnl Checks for buggy strtok_r.
	303	dnl
	304	dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
	305	dnl with optimization that can cause segfaults:
	306	dnl
	307	dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
	308	AC_DEFUN([OVS_CHECK_STRTOK_R],
	309	[AC_CACHE_CHECK(
	310	[whether strtok_r macro segfaults on some inputs],
	311	[ovs_cv_strtok_r_bug],
	312	[AC_RUN_IFELSE(
	313	[AC_LANG_PROGRAM([#include <stdio.h>
	314	#include <string.h>
	315	],
	316	[[char string[] = ":::";
	317	char save_ptr = (char ) 0xc0ffee;
	318	char token1, token2;
	319	token1 = strtok_r(string, ":", &save_ptr);
	320	token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd	321	freopen ("/dev/null", "w", stdout);
e50097d2 BP	322	printf ("%s %s\n", token1, token2);
	323	return 0;
	324	]])],
	325	[ovs_cv_strtok_r_bug=no],
	326	[ovs_cv_strtok_r_bug=yes],
	327	[ovs_cv_strtok_r_bug=yes])])
	328	if test $ovs_cv_strtok_r_bug = yes; then
	329	AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
	330	[Define if strtok_r macro segfaults on some inputs])
	331	fi
	332	])
	333
064af421 BP	334	dnl ----------------------------------------------------------------------
	335	dnl These macros are from GNU PSPP, with the following original license:
	336	dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
	337	dnl This file is free software; the Free Software Foundation
	338	dnl gives unlimited permission to copy and/or distribute it,
	339	dnl with or without modifications, as long as this notice is preserved.
	340
	341	dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
	342	dnl Check whether the given C compiler OPTION is accepted.
	343	dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
	344	AC_DEFUN([OVS_CHECK_CC_OPTION],
	345	[
	346	m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
	347	AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
	348	[ovs_save_CFLAGS="$CFLAGS"
	349	CFLAGS="$CFLAGS $1"
	350	AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
	351	CFLAGS="$ovs_save_CFLAGS"])
	352	if test $ovs_cv_name = yes; then
83f6c050	353	m4_if([$2], [], [:], [$2])
064af421 BP	354	else
	355	m4_if([$3], [], [:], [$3])
	356	fi
	357	])
	358
	359	dnl OVS_ENABLE_OPTION([OPTION])
	360	dnl Check whether the given C compiler OPTION is accepted.
d161c099	361	dnl If so, add it to WARNING_FLAGS.
064af421 BP	362	dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
064af421 BP	363	AC_DEFUN([OVS_ENABLE_OPTION],
d161c099 BP	364	[OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
d161c099 BP	365	AC_SUBST([WARNING_FLAGS])])
c72e245a BP	366
	367	dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
	368	dnl Check whether the given C compiler OPTION is accepted.
	369	dnl If so, enable the given Automake CONDITIONAL.
	370
	371	dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
	372	AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
	373	[OVS_CHECK_CC_OPTION(
	374	[$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
	375	AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421	376	dnl ----------------------------------------------------------------------
ed2d4f6a BP	377
	378	dnl Check for too-old XenServer.
	379	AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
	380	[AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
	381	[if test -e /etc/redhat-release; then
	382	ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]\)-./\1/p' /etc/redhat-release`
	383	fi
	384	if test -z "$ovs_cv_xsversion"; then
	385	ovs_cv_xsversion=none
	386	fi])
	387	case $ovs_cv_xsversion in
	388	none)
	389	;;
	390
	391	[[1-9]][[0-9]]* \| dnl XenServer 10 or later
	392	[[6-9]]* \| dnl XenServer 6 or later
	393	5.[[7-9]]* \| dnl XenServer 5.7 or later
	394	5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* \| dnl XenServer 5.6.1000 or later
	395	5.6.[[2-9]][[0-9]][[0-9]]* \| dnl XenServer 5.6.200 or later
	396	5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
	397	;;
	398
	399	*)
	400	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.)])
	401	;;
	402	esac])
29d935d6 BP	403
	404	dnl OVS_MAKE_HAS_IF([if-true], [if-false])
	405	dnl
	406	dnl Checks whether make has the GNU make $(if condition,then,else) extension.
	407	dnl Runs 'if-true' if so, 'if-false' otherwise.
372d58a4	408	AC_DEFUN([OVS_CHECK_MAKE_IF],
29d935d6 BP	409	[AC_CACHE_CHECK(
	410	[whether ${MAKE-make} has GNU make \$(if) extension],
	411	[ovs_cv_gnu_make_if],
	412	[cat <<'EOF' > conftest.mk
	413	conftest.out:
	414	echo $(if x,y,z) > conftest.out
	415	.PHONY: all
	416	EOF
	417	rm -f conftest.out
	418	AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
	419	${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
	420	AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
	421	cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
	422	result=`cat conftest.out`
	423	rm -f conftest.mk conftest.out
	424	if test "X$result" = "Xy"; then
	425	ovs_cv_gnu_make_if=yes
	426	else
	427	ovs_cv_gnu_make_if=no
372d58a4	428	fi])])
29d935d6	429
b4e1bf8b BP	430	dnl OVS_CHECK_GNU_MAKE
	431	dnl
	432	dnl Checks whether make is GNU make (because Linux kernel Makefiles
	433	dnl only work with GNU make).
	434	AC_DEFUN([OVS_CHECK_GNU_MAKE],
	435	[AC_CACHE_CHECK(
	436	[whether ${MAKE-make} is GNU make],
	437	[ovs_cv_gnu_make],
	438	[rm -f conftest.out
	439	AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
	440	${MAKE-make} --version >conftest.out 2>&1
	441	cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
	442	result=`cat conftest.out`
	443	rm -f conftest.mk conftest.out
	444
	445	case $result in # (
	446	GNU*) ovs_cv_gnu_make=yes ;; # (
	447	*) ovs_cv_gnu_make=no ;;
	448	esac])
	449	AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
	450
643c0c34 BP	451	dnl OVS_CHECK_SPARSE_TARGET
	452	dnl
	453	dnl The "cgcc" script from "sparse" isn't very good at detecting the
	454	dnl target for which the code is being built. This helps it out.
	455	AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
	456	[AC_CACHE_CHECK(
	457	[target hint for cgcc],
	458	[ac_cv_sparse_target],
	459	[AS_CASE([`$CC -dumpmachine 2>/dev/null`],
	460	[i?86-* \| athlon-*], [ac_cv_sparse_target=x86],
	461	[x86_64-*], [ac_cv_sparse_target=x86_64],
	462	[ac_cv_sparse_target=other])])
	463	AS_CASE([$ac_cv_sparse_target],
	464	[x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
	465	[x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
	466	[SPARSEFLAGS= CGCCFLAGS=])
	467	AC_SUBST([SPARSEFLAGS])
	468	AC_SUBST([CGCCFLAGS])])
	469
29d935d6 BP	470	dnl OVS_ENABLE_SPARSE
29d935d6 BP	471	AC_DEFUN([OVS_ENABLE_SPARSE],
643c0c34	472	[AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
372d58a4 BP	473	AC_REQUIRE([OVS_CHECK_MAKE_IF])
	474	: ${SPARSE=sparse}
	475	AC_SUBST([SPARSE])
	476	AC_CONFIG_COMMANDS_PRE(
	477	[if test $ovs_cv_gnu_make_if = yes; then
	478	CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'
	479	fi])])