3 # Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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 # Debian kernel build Makefiles tend to include a line of the form:
102 # MAKEARGS := -C /usr/src/linux-headers-3.2.0-1-common O=/usr/src/linux-headers-3.2.0-1-486
103 # First try to extract the source directory from this line.
104 KSRC=`sed -n 's/.*-C \([[^ ]]*\).*/\1/p' "$KBUILD"/Makefile`
105 if test ! -e "$KSRC"/include/linux/kernel.h; then
106 # Didn't work. Fall back to name-based heuristics that used to work.
107 case `echo "$KBUILD" | sed 's,/*$,,'` in # (
109 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
112 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
117 if test ! -e "$KSRC"/include/linux/kernel.h; then
118 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
121 AC_MSG_RESULT([$KSRC])
123 AC_MSG_CHECKING([for kernel version])
124 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
125 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
126 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
127 if test X"$version" = X || test X"$patchlevel" = X; then
128 AC_ERROR([cannot determine kernel version])
129 elif test X"$sublevel" = X; then
130 kversion=$version.$patchlevel
132 kversion=$version.$patchlevel.$sublevel
134 AC_MSG_RESULT([$kversion])
136 if test "$version" -ge 3; then
138 elif test "$version" = 2 && test "$patchlevel" -ge 6; then
141 if test "$KBUILD" = "$KSRC"; then
142 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
144 AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
147 if test ! -e "$KBUILD"/include/linux/version.h || \
148 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
149 test ! -e "$KBUILD"/include/generated/autoconf.h); then
150 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
152 OVS_CHECK_LINUX_COMPAT
154 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
157 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
159 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
160 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
161 dnl <REGEX> translated to uppercase.
162 AC_DEFUN([OVS_GREP_IFELSE], [
163 AC_MSG_CHECKING([whether $2 matches in $1])
165 grep '$2' $1 >/dev/null 2>&1
170 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
177 AC_MSG_ERROR([grep exited with status $status])
181 AC_MSG_RESULT([file not found])
188 dnl Defines NAME to 1 in kcompat.h.
189 AC_DEFUN([OVS_DEFINE], [
190 echo '#define $1 1' >> datapath/linux/kcompat.h.new
193 AC_DEFUN([OVS_CHECK_LOG2_H], [
194 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
195 if test -e $KSRC/include/linux/log2.h; then
197 OVS_DEFINE([HAVE_LOG2_H])
203 dnl OVS_CHECK_LINUX_COMPAT
205 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
206 dnl the directory in $KBUILD.
207 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
208 rm -f datapath/linux/kcompat.h.new
209 mkdir -p datapath/linux
210 : > datapath/linux/kcompat.h.new
212 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
213 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
215 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
217 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
219 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
220 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
221 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
223 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
224 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
225 [rcu_read_lock_held])])
227 # Check for the proto_data_valid member in struct sk_buff. The [^@]
228 # is necessary because some versions of this header remove the
229 # member but retain the kerneldoc comment that describes it (which
230 # starts with @). The brackets must be doubled because of m4
232 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
233 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
234 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
235 [OVS_DEFINE([HAVE_MAC_RAW])])
236 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
237 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
238 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
239 [skb_copy_from_linear_data_offset])
240 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
241 [skb_reset_tail_pointer])
242 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
243 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
244 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
245 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
246 [OVS_DEFINE([HAVE_ICMP6_HDR])])
247 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
248 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
249 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
250 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
252 OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
253 [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
255 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
256 [OVS_DEFINE([HAVE_BOOL_TYPE])])
257 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
258 [OVS_DEFINE([HAVE_CSUM_TYPES])])
260 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
261 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
263 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
264 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
265 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
267 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
268 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
272 if cmp -s datapath/linux/kcompat.h.new \
273 datapath/linux/kcompat.h >/dev/null 2>&1; then
274 rm datapath/linux/kcompat.h.new
276 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
280 dnl Checks for net/if_packet.h.
281 AC_DEFUN([OVS_CHECK_IF_PACKET],
282 [AC_CHECK_HEADER([net/if_packet.h],
283 [HAVE_IF_PACKET=yes],
285 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
286 if test "$HAVE_IF_PACKET" = yes; then
287 AC_DEFINE([HAVE_IF_PACKET], [1],
288 [Define to 1 if net/if_packet.h is available.])
291 dnl Checks for net/if_dl.h
292 AC_DEFUN([OVS_CHECK_IF_DL],
293 [AC_CHECK_HEADER([net/if_dl.h],
296 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
297 if test "$HAVE_IF_DL" = yes; then
298 AC_DEFINE([HAVE_IF_DL], [1],
299 [Define to 1 if net/if_dl.h is available.])
302 dnl Checks for buggy strtok_r.
304 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
305 dnl with optimization that can cause segfaults:
307 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
308 AC_DEFUN([OVS_CHECK_STRTOK_R],
310 [whether strtok_r macro segfaults on some inputs],
311 [ovs_cv_strtok_r_bug],
313 [AC_LANG_PROGRAM([#include <stdio.h>
316 [[char string[] = ":::";
317 char *save_ptr = (char *) 0xc0ffee;
318 char *token1, *token2;
319 token1 = strtok_r(string, ":", &save_ptr);
320 token2 = strtok_r(NULL, ":", &save_ptr);
321 freopen ("/dev/null", "w", stdout);
322 printf ("%s %s\n", token1, token2);
325 [ovs_cv_strtok_r_bug=no],
326 [ovs_cv_strtok_r_bug=yes],
327 [ovs_cv_strtok_r_bug=yes])])
328 if test $ovs_cv_strtok_r_bug = yes; then
329 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
330 [Define if strtok_r macro segfaults on some inputs])
334 dnl ----------------------------------------------------------------------
335 dnl These macros are from GNU PSPP, with the following original license:
336 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
337 dnl This file is free software; the Free Software Foundation
338 dnl gives unlimited permission to copy and/or distribute it,
339 dnl with or without modifications, as long as this notice is preserved.
341 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
342 dnl Check whether the given C compiler OPTION is accepted.
343 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
344 AC_DEFUN([OVS_CHECK_CC_OPTION],
346 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
347 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
348 [ovs_save_CFLAGS="$CFLAGS"
350 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
351 CFLAGS="$ovs_save_CFLAGS"])
352 if test $ovs_cv_name = yes; then
353 m4_if([$2], [], [:], [$2])
355 m4_if([$3], [], [:], [$3])
359 dnl OVS_ENABLE_OPTION([OPTION])
360 dnl Check whether the given C compiler OPTION is accepted.
361 dnl If so, add it to WARNING_FLAGS.
362 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
363 AC_DEFUN([OVS_ENABLE_OPTION],
364 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
365 AC_SUBST([WARNING_FLAGS])])
367 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
368 dnl Check whether the given C compiler OPTION is accepted.
369 dnl If so, enable the given Automake CONDITIONAL.
371 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
372 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
373 [OVS_CHECK_CC_OPTION(
374 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
375 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
376 dnl ----------------------------------------------------------------------
378 dnl Check for too-old XenServer.
379 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
380 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
381 [if test -e /etc/redhat-release; then
382 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
384 if test -z "$ovs_cv_xsversion"; then
385 ovs_cv_xsversion=none
387 case $ovs_cv_xsversion in
391 [[1-9]][[0-9]]* | dnl XenServer 10 or later
392 [[6-9]]* | dnl XenServer 6 or later
393 5.[[7-9]]* | dnl XenServer 5.7 or later
394 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
395 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
396 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
400 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.)])
404 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
406 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
407 dnl Runs 'if-true' if so, 'if-false' otherwise.
408 AC_DEFUN([OVS_MAKE_HAS_IF],
410 [whether ${MAKE-make} has GNU make \$(if) extension],
411 [ovs_cv_gnu_make_if],
412 [cat <<'EOF' > conftest.mk
414 echo $(if x,y,z) > conftest.out
418 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
419 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
420 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
421 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
422 result=`cat conftest.out`
423 rm -f conftest.mk conftest.out
424 if test "X$result" = "Xy"; then
425 ovs_cv_gnu_make_if=yes
427 ovs_cv_gnu_make_if=no
429 AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
431 dnl OVS_CHECK_SPARSE_TARGET
433 dnl The "cgcc" script from "sparse" isn't very good at detecting the
434 dnl target for which the code is being built. This helps it out.
435 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
437 [target hint for cgcc],
438 [ac_cv_sparse_target],
439 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
440 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
441 [x86_64-*], [ac_cv_sparse_target=x86_64],
442 [ac_cv_sparse_target=other])])
443 AS_CASE([$ac_cv_sparse_target],
444 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
445 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
446 [SPARSEFLAGS= CGCCFLAGS=])
447 AC_SUBST([SPARSEFLAGS])
448 AC_SUBST([CGCCFLAGS])])
450 dnl OVS_ENABLE_SPARSE
451 AC_DEFUN([OVS_ENABLE_SPARSE],
452 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
454 [AC_CONFIG_COMMANDS_PRE(
457 CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])