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])
63 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
67 if test -n "$KBUILD"; then
68 KBUILD=`eval echo "$KBUILD"`
71 *) KBUILD=`pwd`/$KBUILD ;;
74 # The build directory is what the user provided.
75 # Make sure that it exists.
76 AC_MSG_CHECKING([for Linux build directory])
77 if test -d "$KBUILD"; then
78 AC_MSG_RESULT([$KBUILD])
82 AC_ERROR([source dir $KBUILD doesn't exist])
85 # Debian breaks kernel headers into "source" header and "build" headers.
86 # We want the source headers, but $KBUILD gives us the "build" headers.
87 # Use heuristics to find the source headers.
88 AC_MSG_CHECKING([for Linux source directory])
89 if test -n "$KSRC"; then
90 KSRC=`eval echo "$KSRC"`
93 *) KSRC=`pwd`/$KSRC ;;
95 if test ! -e $KSRC/include/linux/kernel.h; then
96 AC_MSG_ERROR([$KSRC is not a kernel source directory])
100 if test ! -e $KSRC/include/linux/kernel.h; then
101 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
103 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
106 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
110 if test ! -e $KSRC/include/linux/kernel.h; then
111 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
114 AC_MSG_RESULT([$KSRC])
116 AC_MSG_CHECKING([for kernel version])
117 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
118 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
119 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
120 if test X"$version" = X || test X"$patchlevel" = X; then
121 AC_ERROR([cannot determine kernel version])
122 elif test X"$sublevel" = X; then
123 kversion=$version.$patchlevel
125 kversion=$version.$patchlevel.$sublevel
127 AC_MSG_RESULT([$kversion])
129 if test "$version" -ge 3; then
131 elif test "$version" = 2 && test "$patchlevel" -ge 6; then
134 if test "$KBUILD" = "$KSRC"; then
135 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
137 AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
140 if test ! -e "$KBUILD"/include/linux/version.h || \
141 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
142 test ! -e "$KBUILD"/include/generated/autoconf.h); then
143 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
145 OVS_CHECK_LINUX_COMPAT
147 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
150 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
152 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
153 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
154 dnl <REGEX> translated to uppercase.
155 AC_DEFUN([OVS_GREP_IFELSE], [
156 AC_MSG_CHECKING([whether $2 matches in $1])
158 grep '$2' $1 >/dev/null 2>&1
163 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
170 AC_MSG_ERROR([grep exited with status $status])
174 AC_MSG_RESULT([file not found])
181 dnl Defines NAME to 1 in kcompat.h.
182 AC_DEFUN([OVS_DEFINE], [
183 echo '#define $1 1' >> datapath/linux/kcompat.h.new
186 AC_DEFUN([OVS_CHECK_LOG2_H], [
187 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
188 if test -e $KSRC/include/linux/log2.h; then
190 OVS_DEFINE([HAVE_LOG2_H])
196 dnl OVS_CHECK_LINUX_COMPAT
198 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
199 dnl the directory in $KBUILD.
200 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
201 rm -f datapath/linux/kcompat.h.new
202 mkdir -p datapath/linux
203 : > datapath/linux/kcompat.h.new
205 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
206 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
208 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
210 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
212 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
213 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
214 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
216 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
217 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
218 [rcu_read_lock_held])])
220 # Check for the proto_data_valid member in struct sk_buff. The [^@]
221 # is necessary because some versions of this header remove the
222 # member but retain the kerneldoc comment that describes it (which
223 # starts with @). The brackets must be doubled because of m4
225 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
226 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
227 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
228 [OVS_DEFINE([HAVE_MAC_RAW])])
229 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
230 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
231 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
232 [skb_copy_from_linear_data_offset])
233 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
234 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
235 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
236 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
237 [OVS_DEFINE([HAVE_ICMP6_HDR])])
238 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
239 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
240 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
242 OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
243 [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
245 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
246 [OVS_DEFINE([HAVE_BOOL_TYPE])])
247 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
248 [OVS_DEFINE([HAVE_CSUM_TYPES])])
250 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
251 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
253 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
254 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
255 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
257 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
258 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
262 if cmp -s datapath/linux/kcompat.h.new \
263 datapath/linux/kcompat.h >/dev/null 2>&1; then
264 rm datapath/linux/kcompat.h.new
266 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
270 dnl Checks for net/if_packet.h.
271 AC_DEFUN([OVS_CHECK_IF_PACKET],
272 [AC_CHECK_HEADER([net/if_packet.h],
273 [HAVE_IF_PACKET=yes],
275 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
276 if test "$HAVE_IF_PACKET" = yes; then
277 AC_DEFINE([HAVE_IF_PACKET], [1],
278 [Define to 1 if net/if_packet.h is available.])
281 dnl Checks for buggy strtok_r.
283 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
284 dnl with optimization that can cause segfaults:
286 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
287 AC_DEFUN([OVS_CHECK_STRTOK_R],
289 [whether strtok_r macro segfaults on some inputs],
290 [ovs_cv_strtok_r_bug],
292 [AC_LANG_PROGRAM([#include <stdio.h>
295 [[char string[] = ":::";
296 char *save_ptr = (char *) 0xc0ffee;
297 char *token1, *token2;
298 token1 = strtok_r(string, ":", &save_ptr);
299 token2 = strtok_r(NULL, ":", &save_ptr);
300 freopen ("/dev/null", "w", stdout);
301 printf ("%s %s\n", token1, token2);
304 [ovs_cv_strtok_r_bug=no],
305 [ovs_cv_strtok_r_bug=yes],
306 [ovs_cv_strtok_r_bug=yes])])
307 if test $ovs_cv_strtok_r_bug = yes; then
308 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
309 [Define if strtok_r macro segfaults on some inputs])
313 dnl ----------------------------------------------------------------------
314 dnl These macros are from GNU PSPP, with the following original license:
315 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
316 dnl This file is free software; the Free Software Foundation
317 dnl gives unlimited permission to copy and/or distribute it,
318 dnl with or without modifications, as long as this notice is preserved.
320 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
321 dnl Check whether the given C compiler OPTION is accepted.
322 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
323 AC_DEFUN([OVS_CHECK_CC_OPTION],
325 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
326 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
327 [ovs_save_CFLAGS="$CFLAGS"
329 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
330 CFLAGS="$ovs_save_CFLAGS"])
331 if test $ovs_cv_name = yes; then
332 m4_if([$2], [], [:], [$2])
334 m4_if([$3], [], [:], [$3])
338 dnl OVS_ENABLE_OPTION([OPTION])
339 dnl Check whether the given C compiler OPTION is accepted.
340 dnl If so, add it to WARNING_FLAGS.
341 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
342 AC_DEFUN([OVS_ENABLE_OPTION],
343 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
344 AC_SUBST([WARNING_FLAGS])])
346 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
347 dnl Check whether the given C compiler OPTION is accepted.
348 dnl If so, enable the given Automake CONDITIONAL.
350 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
351 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
352 [OVS_CHECK_CC_OPTION(
353 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
354 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
355 dnl ----------------------------------------------------------------------
357 dnl Check for too-old XenServer.
358 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
359 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
360 [if test -e /etc/redhat-release; then
361 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
363 if test -z "$ovs_cv_xsversion"; then
364 ovs_cv_xsversion=none
366 case $ovs_cv_xsversion in
370 [[1-9]][[0-9]]* | dnl XenServer 10 or later
371 [[6-9]]* | dnl XenServer 6 or later
372 5.[[7-9]]* | dnl XenServer 5.7 or later
373 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
374 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
375 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
379 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.)])
383 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
385 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
386 dnl Runs 'if-true' if so, 'if-false' otherwise.
387 AC_DEFUN([OVS_MAKE_HAS_IF],
389 [whether ${MAKE-make} has GNU make \$(if) extension],
390 [ovs_cv_gnu_make_if],
391 [cat <<'EOF' > conftest.mk
393 echo $(if x,y,z) > conftest.out
397 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
398 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
399 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
400 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
401 result=`cat conftest.out`
402 rm -f conftest.mk conftest.out
403 if test "X$result" = "Xy"; then
404 ovs_cv_gnu_make_if=yes
406 ovs_cv_gnu_make_if=no
408 AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
410 dnl OVS_CHECK_SPARSE_TARGET
412 dnl The "cgcc" script from "sparse" isn't very good at detecting the
413 dnl target for which the code is being built. This helps it out.
414 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
416 [target hint for cgcc],
417 [ac_cv_sparse_target],
418 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
419 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
420 [x86_64-*], [ac_cv_sparse_target=x86_64],
421 [ac_cv_sparse_target=other])])
422 AS_CASE([$ac_cv_sparse_target],
423 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
424 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
425 [SPARSEFLAGS= CGCCFLAGS=])
426 AC_SUBST([SPARSEFLAGS])
427 AC_SUBST([CGCCFLAGS])])
429 dnl OVS_ENABLE_SPARSE
430 AC_DEFUN([OVS_ENABLE_SPARSE],
431 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
433 [AC_CONFIG_COMMANDS_PRE(
436 CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])