3 # Copyright (c) 2008, 2009, 2010, 2011 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.
18 AC_DEFUN([OVS_ENABLE_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"
30 dnl Configure linux kernel source tree
31 AC_DEFUN([OVS_CHECK_LINUX], [
33 [AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
34 [Specify the linux 2.6 kernel build directory])],
35 [KBUILD="$withval"], [KBUILD=])dnl
36 AC_ARG_WITH([l26-source],
37 [AC_HELP_STRING([--with-l26-source=/path/to/linux-2.6-source],
38 [Specify the linux 2.6 kernel source directory
39 (usually figured out automatically from build
41 [KSRC="$withval"], [KSRC=])dnl
42 if test -n "$KBUILD"; then
43 KBUILD=`eval echo "$KBUILD"`
46 *) KBUILD=`pwd`/$KBUILD ;;
49 # The build directory is what the user provided.
50 # Make sure that it exists.
51 AC_MSG_CHECKING([for Linux 2.6 build directory])
52 if test -d "$KBUILD"; then
53 AC_MSG_RESULT([$KBUILD])
57 AC_ERROR([source dir $KBUILD doesn't exist])
60 # Debian breaks kernel headers into "source" header and "build" headers.
61 # We want the source headers, but $KBUILD gives us the "build" headers.
62 # Use heuristics to find the source headers.
63 AC_MSG_CHECKING([for Linux 2.6 source directory])
64 if test -n "$KSRC"; then
65 KSRC=`eval echo "$KSRC"`
68 *) KSRC=`pwd`/$KSRC ;;
70 if test ! -e $KSRC/include/linux/kernel.h; then
71 AC_MSG_ERROR([$KSRC is not a kernel source directory)])
75 if test ! -e $KSRC/include/linux/kernel.h; then
76 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
78 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
81 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
85 if test ! -e $KSRC/include/linux/kernel.h; then
86 AC_MSG_ERROR([cannot find source directory (please use --with-l26-source)])
89 AC_MSG_RESULT([$KSRC])
91 AC_MSG_CHECKING([for kernel version])
92 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
93 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
94 if test -z "$patchlevel" || test -z "$sublevel"; then
95 AC_ERROR([cannot determine kernel version])
97 AC_MSG_RESULT([2.$patchlevel.$sublevel])
98 if test "2.$patchlevel" != '2.6'; then
99 if test "$KBUILD" = "$KSRC"; then
100 AC_ERROR([Linux kernel in $KBUILD is not version 2.6])
102 AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is not version 2.6])
105 if test ! -e "$KBUILD"/include/linux/version.h || \
106 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
107 test ! -e "$KBUILD"/include/generated/autoconf.h); then
108 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
110 OVS_CHECK_LINUX_COMPAT
111 elif test -n "$KSRC"; then
112 AC_MSG_ERROR([--with-l26-source may not be specified without --with-l26])
114 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
117 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
119 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
120 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
121 dnl <REGEX> translated to uppercase.
122 AC_DEFUN([OVS_GREP_IFELSE], [
123 AC_MSG_CHECKING([whether $2 matches in $1])
125 grep '$2' $1 >/dev/null 2>&1
130 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
137 AC_MSG_ERROR([grep exited with status $status])
141 AC_MSG_RESULT([file not found])
148 dnl Defines NAME to 1 in kcompat.h.
149 AC_DEFUN([OVS_DEFINE], [
150 echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
153 AC_DEFUN([OVS_CHECK_LOG2_H], [
154 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
155 if test -e $KSRC/include/linux/log2.h; then
157 OVS_DEFINE([HAVE_LOG2_H])
163 dnl OVS_CHECK_LINUX_COMPAT
165 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
166 dnl the directory in $KBUILD.
167 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
168 rm -f datapath/linux-2.6/kcompat.h.new
169 mkdir -p datapath/linux-2.6
170 : > datapath/linux-2.6/kcompat.h.new
172 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
173 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
175 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
177 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
179 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
180 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
181 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
183 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
184 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
185 [rcu_read_lock_held])])
187 # Check for the proto_data_valid member in struct sk_buff. The [^@]
188 # is necessary because some versions of this header remove the
189 # member but retain the kerneldoc comment that describes it (which
190 # starts with @). The brackets must be doubled because of m4
192 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
193 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
194 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
195 [OVS_DEFINE([HAVE_MAC_RAW])])
196 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
197 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
198 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
199 [skb_copy_from_linear_data_offset])
200 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
201 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
202 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
203 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
204 [OVS_DEFINE([HAVE_ICMP6_HDR])])
205 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
206 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
207 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
209 OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
210 [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
212 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
213 [OVS_DEFINE([HAVE_BOOL_TYPE])])
214 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
215 [OVS_DEFINE([HAVE_CSUM_TYPES])])
217 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
218 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
220 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
221 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
222 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
224 OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
226 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
227 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
231 if cmp -s datapath/linux-2.6/kcompat.h.new \
232 datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
233 rm datapath/linux-2.6/kcompat.h.new
235 mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
239 dnl Checks for net/if_packet.h.
240 AC_DEFUN([OVS_CHECK_IF_PACKET],
241 [AC_CHECK_HEADER([net/if_packet.h],
242 [HAVE_IF_PACKET=yes],
244 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
245 if test "$HAVE_IF_PACKET" = yes; then
246 AC_DEFINE([HAVE_IF_PACKET], [1],
247 [Define to 1 if net/if_packet.h is available.])
250 dnl Checks for buggy strtok_r.
252 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
253 dnl with optimization that can cause segfaults:
255 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
256 AC_DEFUN([OVS_CHECK_STRTOK_R],
258 [whether strtok_r macro segfaults on some inputs],
259 [ovs_cv_strtok_r_bug],
261 [AC_LANG_PROGRAM([#include <stdio.h>
264 [[char string[] = ":::";
265 char *save_ptr = (char *) 0xc0ffee;
266 char *token1, *token2;
267 token1 = strtok_r(string, ":", &save_ptr);
268 token2 = strtok_r(NULL, ":", &save_ptr);
269 freopen ("/dev/null", "w", stdout);
270 printf ("%s %s\n", token1, token2);
273 [ovs_cv_strtok_r_bug=no],
274 [ovs_cv_strtok_r_bug=yes],
275 [ovs_cv_strtok_r_bug=yes])])
276 if test $ovs_cv_strtok_r_bug = yes; then
277 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
278 [Define if strtok_r macro segfaults on some inputs])
282 dnl ----------------------------------------------------------------------
283 dnl These macros are from GNU PSPP, with the following original license:
284 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
285 dnl This file is free software; the Free Software Foundation
286 dnl gives unlimited permission to copy and/or distribute it,
287 dnl with or without modifications, as long as this notice is preserved.
289 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
290 dnl Check whether the given C compiler OPTION is accepted.
291 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
292 AC_DEFUN([OVS_CHECK_CC_OPTION],
294 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
295 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
296 [ovs_save_CFLAGS="$CFLAGS"
298 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
299 CFLAGS="$ovs_save_CFLAGS"])
300 if test $ovs_cv_name = yes; then
301 m4_if([$2], [], [:], [$2])
303 m4_if([$3], [], [:], [$3])
307 dnl OVS_ENABLE_OPTION([OPTION])
308 dnl Check whether the given C compiler OPTION is accepted.
309 dnl If so, add it to WARNING_FLAGS.
310 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
311 AC_DEFUN([OVS_ENABLE_OPTION],
312 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
313 AC_SUBST([WARNING_FLAGS])])
315 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
316 dnl Check whether the given C compiler OPTION is accepted.
317 dnl If so, enable the given Automake CONDITIONAL.
319 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
320 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
321 [OVS_CHECK_CC_OPTION(
322 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
323 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
324 dnl ----------------------------------------------------------------------
326 dnl Check for too-old XenServer.
327 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
328 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
329 [if test -e /etc/redhat-release; then
330 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
332 if test -z "$ovs_cv_xsversion"; then
333 ovs_cv_xsversion=none
335 case $ovs_cv_xsversion in
339 [[1-9]][[0-9]]* | dnl XenServer 10 or later
340 [[6-9]]* | dnl XenServer 6 or later
341 5.[[7-9]]* | dnl XenServer 5.7 or later
342 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
343 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
344 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
348 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.)])
352 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
354 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
355 dnl Runs 'if-true' if so, 'if-false' otherwise.
356 AC_DEFUN([OVS_MAKE_HAS_IF],
358 [whether ${MAKE-make} has GNU make \$(if) extension],
359 [ovs_cv_gnu_make_if],
360 [cat <<'EOF' > conftest.mk
362 echo $(if x,y,z) > conftest.out
366 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
367 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
368 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
369 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
370 result=`cat conftest.out`
371 rm -f conftest.mk conftest.out
372 if test "X$result" = "Xy"; then
373 ovs_cv_gnu_make_if=yes
375 ovs_cv_gnu_make_if=no
377 AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
379 dnl OVS_ENABLE_SPARSE
380 AC_DEFUN([OVS_ENABLE_SPARSE],
382 [AC_CONFIG_COMMANDS_PRE(
385 CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse" cgcc,'"$CC"')'])])])