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 "$KBUILD26"`
29 *) KBUILD26=`pwd`/$KBUILD26 ;;
32 # The build directory is what the user provided.
33 # Make sure that it exists.
34 AC_MSG_CHECKING([for Linux 2.6 build directory])
35 if test -d "$KBUILD26"; then
36 AC_MSG_RESULT([$KBUILD26])
40 AC_ERROR([source dir $KBUILD26 doesn't exist])
43 # Debian breaks kernel headers into "source" header and "build" headers.
44 # We want the source headers, but $KBUILD26 gives us the "build" headers.
45 # Use heuristics to find the source headers.
46 AC_MSG_CHECKING([for Linux 2.6 source directory])
48 if test ! -e $KSRC26/include/linux/kernel.h; then
49 case `echo "$KBUILD26" | sed 's,/*$,,'` in # (
51 KSRC26=`echo "$KBUILD26" | sed 's,/build/*$,/source,'`
54 KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
57 if test ! -e $KSRC26/include/linux/kernel.h; then
58 AC_MSG_ERROR([cannot find source directory])
61 AC_MSG_RESULT([$KSRC26])
63 AC_MSG_CHECKING([for kernel version])
64 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
65 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
66 if test -z "$patchlevel" || test -z "$sublevel"; then
67 AC_ERROR([cannot determine kernel version])
69 AC_MSG_RESULT([2.$patchlevel.$sublevel])
70 if test "2.$patchlevel" != '2.6'; then
71 if test "$BUILD26" = "$KSRC26"; then
72 AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
74 AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
77 if test ! -e "$KBUILD26"/include/linux/version.h || \
78 (test ! -e "$KBUILD26"/include/linux/autoconf.h && \
79 test ! -e "$KBUILD26"/include/generated/autoconf.h); then
80 AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
82 OVS_CHECK_LINUX26_COMPAT
84 AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
87 dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH)
89 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
90 AC_DEFUN([OVS_GREP_IFELSE], [
91 AC_MSG_CHECKING([whether $2 matches in $1])
92 grep '$2' $1 >/dev/null 2>&1
104 AC_MSG_ERROR([grep exited with status $status])
111 dnl Defines NAME to 1 in kcompat.h.
112 AC_DEFUN([OVS_DEFINE], [
113 echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
116 AC_DEFUN([OVS_CHECK_LOG2_H], [
117 AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
118 if test -e $KSRC26/include/linux/log2.h; then
120 OVS_DEFINE([HAVE_LOG2_H])
126 dnl OVS_CHECK_LINUX26_COMPAT
128 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
129 dnl the directory in $KBUILD26.
130 AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
131 rm -f datapath/linux-2.6/kcompat.h.new
132 mkdir -p datapath/linux-2.6
133 : > datapath/linux-2.6/kcompat.h.new
135 OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST],
136 [OVS_DEFINE([HAVE_ERR_CAST])])
138 OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
139 [OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
141 OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro],
142 [OVS_DEFINE([HAVE_DEV_DISABLE_LRO])])
143 OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_get_stats],
144 [OVS_DEFINE([HAVE_DEV_GET_STATS])])
146 # Check for the proto_data_valid member in struct sk_buff. The [^@]
147 # is necessary because some versions of this header remove the
148 # member but retain the kerneldoc comment that describes it (which
149 # starts with @). The brackets must be doubled because of m4
151 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
152 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
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], [skb_dst(],
156 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
157 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h],
158 [skb_copy_from_linear_data_offset],
159 [OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])])
160 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow_head],
161 [OVS_DEFINE([HAVE_SKB_COW_HEAD])])
162 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
163 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
164 OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
165 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
167 OVS_GREP_IFELSE([$KSRC26/include/linux/string.h $KSRC26/include/linux/slab.h],
168 [kmemdup], [OVS_DEFINE([HAVE_KMEMDUP])])
170 OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
171 [OVS_DEFINE([HAVE_BOOL_TYPE])])
173 OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold],
174 [OVS_DEFINE([HAVE_CSUM_UNFOLD])])
176 OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING],
177 [OVS_DEFINE([HAVE_NLA_NUL_STRING])])
178 OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16],
179 [OVS_DEFINE([HAVE_NLA_GET_BE16])])
183 if cmp -s datapath/linux-2.6/kcompat.h.new \
184 datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
185 rm datapath/linux-2.6/kcompat.h.new
187 mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
191 dnl Checks for net/if_packet.h.
192 AC_DEFUN([OVS_CHECK_IF_PACKET],
193 [AC_CHECK_HEADER([net/if_packet.h],
194 [HAVE_IF_PACKET=yes],
196 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
197 if test "$HAVE_IF_PACKET" = yes; then
198 AC_DEFINE([HAVE_IF_PACKET], [1],
199 [Define to 1 if net/if_packet.h is available.])
202 dnl Checks for buggy strtok_r.
204 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
205 dnl with optimization that can cause segfaults:
207 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
208 AC_DEFUN([OVS_CHECK_STRTOK_R],
210 [whether strtok_r macro segfaults on some inputs],
211 [ovs_cv_strtok_r_bug],
213 [AC_LANG_PROGRAM([#include <stdio.h>
216 [[char string[] = ":::";
217 char *save_ptr = (char *) 0xc0ffee;
218 char *token1, *token2;
219 token1 = strtok_r(string, ":", &save_ptr);
220 token2 = strtok_r(NULL, ":", &save_ptr);
221 freopen ("/dev/null", "w", stdout);
222 printf ("%s %s\n", token1, token2);
225 [ovs_cv_strtok_r_bug=no],
226 [ovs_cv_strtok_r_bug=yes],
227 [ovs_cv_strtok_r_bug=yes])])
228 if test $ovs_cv_strtok_r_bug = yes; then
229 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
230 [Define if strtok_r macro segfaults on some inputs])
234 dnl ----------------------------------------------------------------------
235 dnl These macros are from GNU PSPP, with the following original license:
236 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
237 dnl This file is free software; the Free Software Foundation
238 dnl gives unlimited permission to copy and/or distribute it,
239 dnl with or without modifications, as long as this notice is preserved.
241 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
242 dnl Check whether the given C compiler OPTION is accepted.
243 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
244 AC_DEFUN([OVS_CHECK_CC_OPTION],
246 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
247 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
248 [ovs_save_CFLAGS="$CFLAGS"
250 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
251 CFLAGS="$ovs_save_CFLAGS"])
252 if test $ovs_cv_name = yes; then
253 m4_if([$2], [], [:], [$2])
255 m4_if([$3], [], [:], [$3])
259 dnl OVS_ENABLE_OPTION([OPTION])
260 dnl Check whether the given C compiler OPTION is accepted.
261 dnl If so, add it to WARNING_FLAGS.
262 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
263 AC_DEFUN([OVS_ENABLE_OPTION],
264 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
265 AC_SUBST([WARNING_FLAGS])])
267 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
268 dnl Check whether the given C compiler OPTION is accepted.
269 dnl If so, enable the given Automake CONDITIONAL.
271 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
272 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
273 [OVS_CHECK_CC_OPTION(
274 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
275 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
276 dnl ----------------------------------------------------------------------