3 # Copyright (c) 2008, 2009, 2010 Nicira Networks.
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:
9 # http://www.apache.org/licenses/LICENSE-2.0
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.
19 dnl Configure linux kernel source tree
20 AC_DEFUN([OVS_CHECK_LINUX26], [
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 "$KBUILD26"`
28 # The build directory is what the user provided.
29 # Make sure that it exists.
30 AC_MSG_CHECKING([for Linux 2.6 build directory])
31 if test -d "$KBUILD26"; then
32 AC_MSG_RESULT([$KBUILD26])
36 AC_ERROR([source dir $KBUILD26 doesn't exist])
39 # Debian breaks kernel headers into "source" header and "build" headers.
40 # We want the source headers, but $KBUILD26 gives us the "build" headers.
41 # Use heuristics to find the source headers.
42 AC_MSG_CHECKING([for Linux 2.6 source directory])
44 if test ! -e $KSRC26/include/linux/kernel.h; then
45 case `echo "$KBUILD26" | sed 's,/*$,,'` in # (
47 KSRC26=`echo "$KBUILD26" | sed 's,/build/*$,/source,'`
50 KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
53 if test ! -e $KSRC26/include/linux/kernel.h; then
54 AC_MSG_ERROR([cannot find source directory])
57 AC_MSG_RESULT([$KSRC26])
59 AC_MSG_CHECKING([for kernel version])
60 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
61 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
62 if test -z "$patchlevel" || test -z "$sublevel"; then
63 AC_ERROR([cannot determine kernel version])
65 AC_MSG_RESULT([2.$patchlevel.$sublevel])
66 if test "2.$patchlevel" != '2.6'; then
67 if test "$BUILD26" = "$KSRC26"; then
68 AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
70 AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
73 if ! test -e "$KBUILD26"/include/linux/version.h || \
74 ! test -e "$KBUILD26"/include/linux/autoconf.h; then
75 AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
77 OVS_CHECK_LINUX26_COMPAT
79 AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
82 dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
84 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
85 AC_DEFUN([OVS_GREP_IFELSE], [
86 AC_MSG_CHECKING([whether $2 matches in $1])
87 grep '$2' $1 >/dev/null 2>&1
99 AC_MSG_ERROR([grep exited with status $status])
106 dnl Defines NAME to 1 in kcompat.h.
107 AC_DEFUN([OVS_DEFINE], [
108 echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
111 AC_DEFUN([OVS_CHECK_VETH], [
112 AC_MSG_CHECKING([whether to build veth module])
113 if test "$sublevel" = 18; then
115 AC_SUBST([BUILD_VETH], 1)
121 AC_DEFUN([OVS_CHECK_GRE], [
122 AC_MSG_CHECKING([whether to build gre module])
123 if test "$sublevel" -ge 18; then
125 AC_SUBST([BUILD_GRE], 1)
131 AC_DEFUN([OVS_CHECK_LOG2_H], [
132 AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
133 if test -e $KSRC26/include/linux/log2.h; then
135 OVS_DEFINE([HAVE_LOG2_H])
141 dnl OVS_CHECK_LINUX26_COMPAT
143 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
144 dnl the directory in $KBUILD26.
145 AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
146 rm -f datapath/linux-2.6/kcompat.h.new
147 mkdir -p datapath/linux-2.6
148 : > datapath/linux-2.6/kcompat.h.new
149 OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
150 [OVS_DEFINE([HAVE_BOOL_TYPE])])
151 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
152 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
153 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
154 [OVS_DEFINE([HAVE_MAC_RAW])])
155 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
156 [skb_copy_from_linear_data_offset],
157 [OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
158 OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
159 [OVS_DEFINE([HAVE_NLA_NUL_STRING])])
160 OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
161 [OVS_DEFINE([HAVE_ERR_CAST])])
162 OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
163 [OVS_DEFINE([HAVE_CSUM_UNFOLD])])
164 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow],
165 [OVS_DEFINE([HAVE_SKB_COW])])
166 OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
167 [OVS_DEFINE([HAVE_NLA_GET_BE16])])
168 OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
169 [OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
170 # Check for the proto_data_valid member in struct sk_buff. The [^@]
171 # is necessary because some versions of this header remove the
172 # member but retain the kerneldoc comment that describes it (which
173 # starts with @). The brackets must be doubled because of m4
175 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
176 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
180 if cmp -s datapath/linux-2.6/kcompat.h.new \
181 datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
182 rm datapath/linux-2.6/kcompat.h.new
184 mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
188 dnl Checks for net/if_packet.h.
189 AC_DEFUN([OVS_CHECK_IF_PACKET],
190 [AC_CHECK_HEADER([net/if_packet.h],
191 [HAVE_IF_PACKET=yes],
193 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
194 if test "$HAVE_IF_PACKET" = yes; then
195 AC_DEFINE([HAVE_IF_PACKET], [1],
196 [Define to 1 if net/if_packet.h is available.])
199 dnl Checks for buggy strtok_r.
201 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
202 dnl with optimization that can cause segfaults:
204 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
205 AC_DEFUN([OVS_CHECK_STRTOK_R],
207 [whether strtok_r macro segfaults on some inputs],
208 [ovs_cv_strtok_r_bug],
210 [AC_LANG_PROGRAM([#include <stdio.h>
213 [[char string[] = ":::";
214 char *save_ptr = (char *) 0xc0ffee;
215 char *token1, *token2;
216 token1 = strtok_r(string, ":", &save_ptr);
217 token2 = strtok_r(NULL, ":", &save_ptr);
218 printf ("%s %s\n", token1, token2);
221 [ovs_cv_strtok_r_bug=no],
222 [ovs_cv_strtok_r_bug=yes],
223 [ovs_cv_strtok_r_bug=yes])])
224 if test $ovs_cv_strtok_r_bug = yes; then
225 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
226 [Define if strtok_r macro segfaults on some inputs])
230 dnl ----------------------------------------------------------------------
231 dnl These macros are from GNU PSPP, with the following original license:
232 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
233 dnl This file is free software; the Free Software Foundation
234 dnl gives unlimited permission to copy and/or distribute it,
235 dnl with or without modifications, as long as this notice is preserved.
237 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
238 dnl Check whether the given C compiler OPTION is accepted.
239 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
240 AC_DEFUN([OVS_CHECK_CC_OPTION],
242 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
243 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
244 [ovs_save_CFLAGS="$CFLAGS"
246 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
247 CFLAGS="$ovs_save_CFLAGS"])
248 if test $ovs_cv_name = yes; then
249 m4_if([$2], [], [:], [$2])
251 m4_if([$3], [], [:], [$3])
255 dnl OVS_ENABLE_OPTION([OPTION])
256 dnl Check whether the given C compiler OPTION is accepted.
257 dnl If so, add it to WARNING_FLAGS.
258 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
259 AC_DEFUN([OVS_ENABLE_OPTION],
260 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
261 AC_SUBST([WARNING_FLAGS])])
262 dnl ----------------------------------------------------------------------