mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 01:51:26 +00:00
f5fb5de6be
OVS can usually find the kernel source itself, but when it can't it's handy if the user can just specify it on the "configure" command line. Signed-off-by: Ian Campbell <Ian.Campbell@citrix.com>. Signed-off-by: Ben Pfaff <blp@nicira.com> Reported-by: Jad Naous <jnaous@gmail.com>
296 lines
11 KiB
Plaintext
296 lines
11 KiB
Plaintext
# -*- autoconf -*-
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# Copyright (c) 2008, 2009, 2010 Nicira Networks.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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dnl OVS_CHECK_LINUX26
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dnl
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dnl Configure linux kernel source tree
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AC_DEFUN([OVS_CHECK_LINUX26], [
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AC_ARG_WITH([l26],
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[AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
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[Specify the linux 2.6 kernel build directory])],
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[KBUILD26="$withval"], [KBUILD26=])dnl
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AC_ARG_WITH([l26-source],
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[AC_HELP_STRING([--with-l26-source=/path/to/linux-2.6-source],
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[Specify the linux 2.6 kernel source directory
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(usually figured out automatically from build
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directory)])],
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[KSRC26="$withval"], [KSRC26=])dnl
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if test -n "$KBUILD26"; then
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KBUILD26=`eval echo "$KBUILD26"`
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case $KBUILD26 in
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/*) ;;
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*) KBUILD26=`pwd`/$KBUILD26 ;;
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esac
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# The build directory is what the user provided.
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# Make sure that it exists.
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AC_MSG_CHECKING([for Linux 2.6 build directory])
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if test -d "$KBUILD26"; then
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AC_MSG_RESULT([$KBUILD26])
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AC_SUBST(KBUILD26)
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else
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AC_MSG_RESULT([no])
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AC_ERROR([source dir $KBUILD26 doesn't exist])
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fi
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# Debian breaks kernel headers into "source" header and "build" headers.
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# We want the source headers, but $KBUILD26 gives us the "build" headers.
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# Use heuristics to find the source headers.
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AC_MSG_CHECKING([for Linux 2.6 source directory])
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if test -n "$KSRC26"; then
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KSRC26=`eval echo "$KSRC26"`
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case $KSRC26 in
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/*) ;;
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*) KSRC26=`pwd`/$KSRC26 ;;
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esac
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if test ! -e $KSRC26/include/linux/kernel.h; then
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AC_MSG_ERROR([$KSRC26 is not a kernel source directory)])
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fi
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else
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KSRC26=$KBUILD26
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if test ! -e $KSRC26/include/linux/kernel.h; then
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case `echo "$KBUILD26" | sed 's,/*$,,'` in # (
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*/build)
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KSRC26=`echo "$KBUILD26" | sed 's,/build/*$,/source,'`
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;; # (
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*)
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KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
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;;
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esac
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fi
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if test ! -e $KSRC26/include/linux/kernel.h; then
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AC_MSG_ERROR([cannot find source directory (please use --with-l26-source)])
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fi
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fi
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AC_MSG_RESULT([$KSRC26])
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AC_MSG_CHECKING([for kernel version])
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patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
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sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
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if test -z "$patchlevel" || test -z "$sublevel"; then
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AC_ERROR([cannot determine kernel version])
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fi
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AC_MSG_RESULT([2.$patchlevel.$sublevel])
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if test "2.$patchlevel" != '2.6'; then
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if test "$BUILD26" = "$KSRC26"; then
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AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
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else
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AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
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fi
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fi
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if test ! -e "$KBUILD26"/include/linux/version.h || \
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(test ! -e "$KBUILD26"/include/linux/autoconf.h && \
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test ! -e "$KBUILD26"/include/generated/autoconf.h); then
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AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
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fi
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OVS_CHECK_LINUX26_COMPAT
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elif test -n "$KSRC26"; then
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AC_MSG_ERROR([--with-l26-source may not be specified without --with-l26])
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fi
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AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
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])
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dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
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dnl
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dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
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AC_DEFUN([OVS_GREP_IFELSE], [
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AC_MSG_CHECKING([whether $2 matches in $1])
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grep '$2' $1 >/dev/null 2>&1
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status=$?
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case $status in
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0)
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AC_MSG_RESULT([yes])
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$3
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;;
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1)
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AC_MSG_RESULT([no])
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$4
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;;
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*)
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AC_MSG_ERROR([grep exited with status $status])
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;;
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esac
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])
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dnl OVS_DEFINE(NAME)
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dnl
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dnl Defines NAME to 1 in kcompat.h.
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AC_DEFUN([OVS_DEFINE], [
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echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
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])
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AC_DEFUN([OVS_CHECK_LOG2_H], [
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AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
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if test -e $KSRC26/include/linux/log2.h; then
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AC_MSG_RESULT([yes])
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OVS_DEFINE([HAVE_LOG2_H])
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else
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AC_MSG_RESULT([no])
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fi
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])
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dnl OVS_CHECK_LINUX26_COMPAT
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dnl
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dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
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dnl the directory in $KBUILD26.
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AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
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rm -f datapath/linux-2.6/kcompat.h.new
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mkdir -p datapath/linux-2.6
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: > datapath/linux-2.6/kcompat.h.new
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OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
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[OVS_DEFINE([HAVE_ERR_CAST])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
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[OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro],
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[OVS_DEFINE([HAVE_DEV_DISABLE_LRO])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_get_stats],
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[OVS_DEFINE([HAVE_DEV_GET_STATS])])
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# Check for the proto_data_valid member in struct sk_buff. The [^@]
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# is necessary because some versions of this header remove the
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# member but retain the kerneldoc comment that describes it (which
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# starts with @). The brackets must be doubled because of m4
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# quoting rules.
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
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[OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
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[OVS_DEFINE([HAVE_MAC_RAW])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_dst(],
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[OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
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[skb_copy_from_linear_data_offset],
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[OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow_head],
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[OVS_DEFINE([HAVE_SKB_COW_HEAD])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
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[OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
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[OVS_DEFINE([HAVE_SKB_WARN_LRO])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/string.h $KSRC26/include/linux/slab.h],
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[kmemdup], [OVS_DEFINE([HAVE_KMEMDUP])])
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OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
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[OVS_DEFINE([HAVE_BOOL_TYPE])])
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OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
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[OVS_DEFINE([HAVE_CSUM_UNFOLD])])
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OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
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[OVS_DEFINE([HAVE_NLA_NUL_STRING])])
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OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
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[OVS_DEFINE([HAVE_NLA_GET_BE16])])
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OVS_CHECK_LOG2_H
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if cmp -s datapath/linux-2.6/kcompat.h.new \
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datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
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rm datapath/linux-2.6/kcompat.h.new
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else
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mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
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fi
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])
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dnl Checks for net/if_packet.h.
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AC_DEFUN([OVS_CHECK_IF_PACKET],
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[AC_CHECK_HEADER([net/if_packet.h],
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[HAVE_IF_PACKET=yes],
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[HAVE_IF_PACKET=no])
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AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
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if test "$HAVE_IF_PACKET" = yes; then
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AC_DEFINE([HAVE_IF_PACKET], [1],
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[Define to 1 if net/if_packet.h is available.])
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fi])
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dnl Checks for buggy strtok_r.
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dnl
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dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
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dnl with optimization that can cause segfaults:
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dnl
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dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
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AC_DEFUN([OVS_CHECK_STRTOK_R],
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[AC_CACHE_CHECK(
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[whether strtok_r macro segfaults on some inputs],
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[ovs_cv_strtok_r_bug],
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM([#include <stdio.h>
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#include <string.h>
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],
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[[char string[] = ":::";
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char *save_ptr = (char *) 0xc0ffee;
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char *token1, *token2;
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token1 = strtok_r(string, ":", &save_ptr);
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token2 = strtok_r(NULL, ":", &save_ptr);
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freopen ("/dev/null", "w", stdout);
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printf ("%s %s\n", token1, token2);
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return 0;
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]])],
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[ovs_cv_strtok_r_bug=no],
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[ovs_cv_strtok_r_bug=yes],
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[ovs_cv_strtok_r_bug=yes])])
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if test $ovs_cv_strtok_r_bug = yes; then
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AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
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[Define if strtok_r macro segfaults on some inputs])
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fi
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])
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dnl ----------------------------------------------------------------------
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dnl These macros are from GNU PSPP, with the following original license:
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dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
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dnl Check whether the given C compiler OPTION is accepted.
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dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
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AC_DEFUN([OVS_CHECK_CC_OPTION],
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[
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m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
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AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
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[ovs_save_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
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CFLAGS="$ovs_save_CFLAGS"])
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if test $ovs_cv_name = yes; then
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m4_if([$2], [], [:], [$2])
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else
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m4_if([$3], [], [:], [$3])
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fi
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])
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dnl OVS_ENABLE_OPTION([OPTION])
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dnl Check whether the given C compiler OPTION is accepted.
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dnl If so, add it to WARNING_FLAGS.
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dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
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AC_DEFUN([OVS_ENABLE_OPTION],
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[OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
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AC_SUBST([WARNING_FLAGS])])
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dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
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dnl Check whether the given C compiler OPTION is accepted.
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dnl If so, enable the given Automake CONDITIONAL.
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dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
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AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
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[OVS_CHECK_CC_OPTION(
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[$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
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AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
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dnl ----------------------------------------------------------------------
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