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-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
38 (usually figured out automatically from build
41 # Deprecated equivalents to --with-linux, --with-linux-source.
43 AC_ARG_WITH([l26-source])
45 if test X"$with_linux" != X; then
47 elif test X"$with_l26" != X; then
49 AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
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
59 AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
61 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
62 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
65 if test -n "$KBUILD"; then
66 KBUILD=`eval echo "$KBUILD"`
69 *) KBUILD=`pwd`/$KBUILD ;;
72 # The build directory is what the user provided.
73 # Make sure that it exists.
74 AC_MSG_CHECKING([for Linux build directory])
75 if test -d "$KBUILD"; then
76 AC_MSG_RESULT([$KBUILD])
80 AC_ERROR([source dir $KBUILD doesn't exist])
83 # Debian breaks kernel headers into "source" header and "build" headers.
84 # We want the source headers, but $KBUILD gives us the "build" headers.
85 # Use heuristics to find the source headers.
86 AC_MSG_CHECKING([for Linux source directory])
87 if test -n "$KSRC"; then
88 KSRC=`eval echo "$KSRC"`
91 *) KSRC=`pwd`/$KSRC ;;
93 if test ! -e $KSRC/include/linux/kernel.h; then
94 AC_MSG_ERROR([$KSRC is not a kernel source directory)])
98 if test ! -e $KSRC/include/linux/kernel.h; then
99 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
101 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
104 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
108 if test ! -e $KSRC/include/linux/kernel.h; then
109 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
112 AC_MSG_RESULT([$KSRC])
114 AC_MSG_CHECKING([for kernel version])
115 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
116 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
117 if test -z "$patchlevel" || test -z "$sublevel"; then
118 AC_ERROR([cannot determine kernel version])
120 AC_MSG_RESULT([2.$patchlevel.$sublevel])
121 if test "2.$patchlevel" != '2.6'; then
122 if test "$KBUILD" = "$KSRC"; then
123 AC_ERROR([Linux kernel in $KBUILD is not version 2.6])
125 AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is not version 2.6])
128 if test ! -e "$KBUILD"/include/linux/version.h || \
129 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
130 test ! -e "$KBUILD"/include/generated/autoconf.h); then
131 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
133 OVS_CHECK_LINUX_COMPAT
135 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
138 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
140 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
141 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
142 dnl <REGEX> translated to uppercase.
143 AC_DEFUN([OVS_GREP_IFELSE], [
144 AC_MSG_CHECKING([whether $2 matches in $1])
146 grep '$2' $1 >/dev/null 2>&1
151 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
158 AC_MSG_ERROR([grep exited with status $status])
162 AC_MSG_RESULT([file not found])
169 dnl Defines NAME to 1 in kcompat.h.
170 AC_DEFUN([OVS_DEFINE], [
171 echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
174 AC_DEFUN([OVS_CHECK_LOG2_H], [
175 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
176 if test -e $KSRC/include/linux/log2.h; then
178 OVS_DEFINE([HAVE_LOG2_H])
184 dnl OVS_CHECK_LINUX_COMPAT
186 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
187 dnl the directory in $KBUILD.
188 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
189 rm -f datapath/linux-2.6/kcompat.h.new
190 mkdir -p datapath/linux-2.6
191 : > datapath/linux-2.6/kcompat.h.new
193 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
194 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
196 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
198 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
200 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
201 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
202 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
204 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
205 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
206 [rcu_read_lock_held])])
208 # Check for the proto_data_valid member in struct sk_buff. The [^@]
209 # is necessary because some versions of this header remove the
210 # member but retain the kerneldoc comment that describes it (which
211 # starts with @). The brackets must be doubled because of m4
213 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
214 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
215 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
216 [OVS_DEFINE([HAVE_MAC_RAW])])
217 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
218 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
219 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
220 [skb_copy_from_linear_data_offset])
221 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
222 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
223 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
224 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
225 [OVS_DEFINE([HAVE_ICMP6_HDR])])
226 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
227 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
228 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
230 OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
231 [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
233 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
234 [OVS_DEFINE([HAVE_BOOL_TYPE])])
235 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
236 [OVS_DEFINE([HAVE_CSUM_TYPES])])
238 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
239 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
241 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
242 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
243 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
245 OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
247 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
248 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
252 if cmp -s datapath/linux-2.6/kcompat.h.new \
253 datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
254 rm datapath/linux-2.6/kcompat.h.new
256 mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
260 dnl Checks for net/if_packet.h.
261 AC_DEFUN([OVS_CHECK_IF_PACKET],
262 [AC_CHECK_HEADER([net/if_packet.h],
263 [HAVE_IF_PACKET=yes],
265 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
266 if test "$HAVE_IF_PACKET" = yes; then
267 AC_DEFINE([HAVE_IF_PACKET], [1],
268 [Define to 1 if net/if_packet.h is available.])
271 dnl Checks for buggy strtok_r.
273 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
274 dnl with optimization that can cause segfaults:
276 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
277 AC_DEFUN([OVS_CHECK_STRTOK_R],
279 [whether strtok_r macro segfaults on some inputs],
280 [ovs_cv_strtok_r_bug],
282 [AC_LANG_PROGRAM([#include <stdio.h>
285 [[char string[] = ":::";
286 char *save_ptr = (char *) 0xc0ffee;
287 char *token1, *token2;
288 token1 = strtok_r(string, ":", &save_ptr);
289 token2 = strtok_r(NULL, ":", &save_ptr);
290 freopen ("/dev/null", "w", stdout);
291 printf ("%s %s\n", token1, token2);
294 [ovs_cv_strtok_r_bug=no],
295 [ovs_cv_strtok_r_bug=yes],
296 [ovs_cv_strtok_r_bug=yes])])
297 if test $ovs_cv_strtok_r_bug = yes; then
298 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
299 [Define if strtok_r macro segfaults on some inputs])
303 dnl ----------------------------------------------------------------------
304 dnl These macros are from GNU PSPP, with the following original license:
305 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
306 dnl This file is free software; the Free Software Foundation
307 dnl gives unlimited permission to copy and/or distribute it,
308 dnl with or without modifications, as long as this notice is preserved.
310 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
311 dnl Check whether the given C compiler OPTION is accepted.
312 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
313 AC_DEFUN([OVS_CHECK_CC_OPTION],
315 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
316 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
317 [ovs_save_CFLAGS="$CFLAGS"
319 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
320 CFLAGS="$ovs_save_CFLAGS"])
321 if test $ovs_cv_name = yes; then
322 m4_if([$2], [], [:], [$2])
324 m4_if([$3], [], [:], [$3])
328 dnl OVS_ENABLE_OPTION([OPTION])
329 dnl Check whether the given C compiler OPTION is accepted.
330 dnl If so, add it to WARNING_FLAGS.
331 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
332 AC_DEFUN([OVS_ENABLE_OPTION],
333 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
334 AC_SUBST([WARNING_FLAGS])])
336 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
337 dnl Check whether the given C compiler OPTION is accepted.
338 dnl If so, enable the given Automake CONDITIONAL.
340 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
341 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
342 [OVS_CHECK_CC_OPTION(
343 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
344 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
345 dnl ----------------------------------------------------------------------
347 dnl Check for too-old XenServer.
348 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
349 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
350 [if test -e /etc/redhat-release; then
351 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
353 if test -z "$ovs_cv_xsversion"; then
354 ovs_cv_xsversion=none
356 case $ovs_cv_xsversion in
360 [[1-9]][[0-9]]* | dnl XenServer 10 or later
361 [[6-9]]* | dnl XenServer 6 or later
362 5.[[7-9]]* | dnl XenServer 5.7 or later
363 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
364 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
365 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
369 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.)])
373 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
375 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
376 dnl Runs 'if-true' if so, 'if-false' otherwise.
377 AC_DEFUN([OVS_MAKE_HAS_IF],
379 [whether ${MAKE-make} has GNU make \$(if) extension],
380 [ovs_cv_gnu_make_if],
381 [cat <<'EOF' > conftest.mk
383 echo $(if x,y,z) > conftest.out
387 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
388 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
389 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
390 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
391 result=`cat conftest.out`
392 rm -f conftest.mk conftest.out
393 if test "X$result" = "Xy"; then
394 ovs_cv_gnu_make_if=yes
396 ovs_cv_gnu_make_if=no
398 AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
400 dnl OVS_ENABLE_SPARSE
401 AC_DEFUN([OVS_ENABLE_SPARSE],
403 [AC_CONFIG_COMMANDS_PRE(
406 CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse" cgcc,'"$CC"')'])])])