3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 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$enable_Werror" = Xyes; then
25 OVS_CFLAGS="$OVS_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 "$version" -ge 4; then
137 if test "$version" = 4 && test "$patchlevel" -le 2; then
140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.2.x is not supported (please refer to the FAQ for advice)])
142 elif test "$version" = 3; then
145 if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
146 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
151 if (test ! -e "$KBUILD"/include/linux/version.h && \
152 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
153 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
154 test ! -e "$KBUILD"/include/generated/autoconf.h); then
155 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
157 OVS_CHECK_LINUX_COMPAT
159 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
164 dnl Configure DPDK source tree
165 AC_DEFUN([OVS_CHECK_DPDK], [
167 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
168 [Specify the DPDK build directory])])
170 if test X"$with_dpdk" != X; then
173 DPDK_INCLUDE=$RTE_SDK/include
174 DPDK_LIB_DIR=$RTE_SDK/lib
177 RTE_SDK_FULL=`readlink -f $RTE_SDK`
180 [AC_LANG_PROGRAM([#include <$RTE_SDK_FULL/include/rte_config.h>
181 #if !RTE_LIBRTE_VHOST_USER
184 [], [AC_DEFINE([VHOST_CUSE], [1], [DPDK vhost-cuse support enabled, vhost-user disabled.])
185 DPDK_EXTRA_LIB="-lfuse"])
187 ovs_save_CFLAGS="$CFLAGS"
188 ovs_save_LDFLAGS="$LDFLAGS"
189 LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
190 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
192 # On some systems we have to add -ldl to link with dpdk
194 # This code, at first, tries to link without -ldl (""),
195 # then adds it and tries again.
196 # Before each attempt the search cache must be unset,
197 # otherwise autoconf will stick with the old result
201 for extras in "" "-ldl"; do
202 LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
204 [AC_LANG_PROGRAM([#include <rte_config.h>
205 #include <rte_eal.h>],
206 [int rte_argc; char ** rte_argv;
207 rte_eal_init(rte_argc, rte_argv);])],
213 if $found; then :; else
214 AC_MSG_ERROR([cannot link with dpdk])
216 CFLAGS="$ovs_save_CFLAGS"
217 LDFLAGS="$ovs_save_LDFLAGS"
218 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
219 OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE -mssse3"
221 # DPDK pmd drivers are not linked unless --whole-archive is used.
223 # This happens because the rest of the DPDK code doesn't use any symbol in
224 # the pmd driver objects, and the drivers register themselves using an
225 # __attribute__((constructor)) function.
227 # These options are specified inside a single -Wl directive to prevent
228 # autotools from reordering them.
229 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
230 AC_SUBST([DPDK_vswitchd_LDFLAGS])
231 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
237 AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
240 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
242 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
243 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
244 dnl <REGEX> translated to uppercase.
245 AC_DEFUN([OVS_GREP_IFELSE], [
246 AC_MSG_CHECKING([whether $2 matches in $1])
248 grep '$2' $1 >/dev/null 2>&1
253 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
260 AC_MSG_ERROR([grep exited with status $status])
264 AC_MSG_RESULT([file not found])
269 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
271 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
272 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
273 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
274 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
275 dnl translated to uppercase.
276 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
277 AC_MSG_CHECKING([whether $2 has member $3 in $1])
279 awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
284 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
291 AC_MSG_ERROR([grep exited with status $status])
295 AC_MSG_RESULT([file not found])
302 dnl Defines NAME to 1 in kcompat.h.
303 AC_DEFUN([OVS_DEFINE], [
304 echo '#define $1 1' >> datapath/linux/kcompat.h.new
307 dnl OVS_CHECK_LINUX_COMPAT
309 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
310 dnl the directory in $KBUILD.
311 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
312 rm -f datapath/linux/kcompat.h.new
313 mkdir -p datapath/linux
314 : > datapath/linux/kcompat.h.new
316 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
317 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
319 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
320 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
322 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
323 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
325 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
326 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_hwaccel_push_inside])
328 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
329 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [proto_ports_offset])
330 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
331 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
332 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
333 [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
334 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [ip_is_fragment])
336 OVS_GREP_IFELSE([$KSRC/include/linux/net.h], [sock_create_kern.*net],
337 [OVS_DEFINE([HAVE_SOCK_CREATE_KERN_NET])])
338 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
339 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
340 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
341 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
342 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
343 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
344 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
345 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_rx_handler_register])
346 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [net_device_extended])
347 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [rx_handler_func_t.*pskb],
348 [OVS_DEFINE([HAVE_RX_HANDLER_PSKB])])
349 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
350 [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
352 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
354 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
355 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
356 [rcu_read_lock_held])])
357 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
359 # Check for the proto_data_valid member in struct sk_buff. The [^@]
360 # is necessary because some versions of this header remove the
361 # member but retain the kerneldoc comment that describes it (which
362 # starts with @). The brackets must be doubled because of m4
364 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
365 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
366 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_checksum_start_offset])
367 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
368 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
369 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
370 [OVS_DEFINE([HAVE_U16_RXHASH])])
371 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
372 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
373 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
374 [skb_copy_from_linear_data_offset])
375 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
376 [skb_reset_tail_pointer])
377 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
378 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
379 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
380 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
381 [OVS_DEFINE([HAVE_ICMP6_HDR])])
382 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
383 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
384 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
385 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
386 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
387 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
388 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
389 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
390 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
391 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
392 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
393 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
394 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
395 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u8.*l4_rxhash],
396 [OVS_DEFINE([HAVE_L4_RXHASH])])
397 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
398 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
399 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
401 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
402 [OVS_DEFINE([HAVE_BOOL_TYPE])])
403 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
404 [OVS_DEFINE([HAVE_CSUM_TYPES])])
405 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
406 [OVS_DEFINE([HAVE_CSUM_TYPES])])
408 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
409 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
411 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
412 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
413 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
414 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
415 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
416 [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
417 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
418 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
419 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
421 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
422 [genl_multicast_group], [id])
423 OVS_GREP_IFELSE([$KSRC/include/net/geneve.h], [geneve_hdr])
425 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
426 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
427 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
428 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
429 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
430 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
431 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_in_addr])
432 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
433 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
435 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
437 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
438 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
439 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
440 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
443 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
445 OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
446 [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
447 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
448 [OVS_DEFINE([HAVE_VXLAN_METADATA])])
449 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
450 [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
451 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
452 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
453 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_set_csum])
454 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
455 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
456 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_GRE_CSUM],
457 [OVS_DEFINE([HAVE_SKB_GSO_GRE_CSUM])])
458 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_UDP_TUNNEL_CSUM],
459 [OVS_DEFINE([HAVE_SKB_GSO_UDP_TUNNEL_CSUM])])
460 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
461 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
463 OVS_GREP_IFELSE([$KSRC/include/linux/utsrelease.h], [el6],
464 [OVS_DEFINE([HAVE_RHEL6_PER_CPU])])
466 if cmp -s datapath/linux/kcompat.h.new \
467 datapath/linux/kcompat.h >/dev/null 2>&1; then
468 rm datapath/linux/kcompat.h.new
470 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
474 dnl Checks for net/if_packet.h.
475 AC_DEFUN([OVS_CHECK_IF_PACKET],
476 [AC_CHECK_HEADER([net/if_packet.h],
477 [HAVE_IF_PACKET=yes],
479 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
480 if test "$HAVE_IF_PACKET" = yes; then
481 AC_DEFINE([HAVE_IF_PACKET], [1],
482 [Define to 1 if net/if_packet.h is available.])
485 dnl Checks for net/if_dl.h.
487 dnl (We use this as a proxy for checking whether we're building on FreeBSD
489 AC_DEFUN([OVS_CHECK_IF_DL],
490 [AC_CHECK_HEADER([net/if_dl.h],
493 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
494 if test "$HAVE_IF_DL" = yes; then
495 AC_DEFINE([HAVE_IF_DL], [1],
496 [Define to 1 if net/if_dl.h is available.])
498 # On these platforms we use libpcap to access network devices.
499 AC_SEARCH_LIBS([pcap_open_live], [pcap])
502 dnl Checks for buggy strtok_r.
504 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
505 dnl with optimization that can cause segfaults:
507 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
508 AC_DEFUN([OVS_CHECK_STRTOK_R],
510 [whether strtok_r macro segfaults on some inputs],
511 [ovs_cv_strtok_r_bug],
513 [AC_LANG_PROGRAM([#include <stdio.h>
516 [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
517 /* Assume bug is present, because relatively minor
518 changes in compiler settings (e.g. optimization
519 level) can make it crop up. */
522 char string[] = ":::";
523 char *save_ptr = (char *) 0xc0ffee;
524 char *token1, *token2;
525 token1 = strtok_r(string, ":", &save_ptr);
526 token2 = strtok_r(NULL, ":", &save_ptr);
527 freopen ("/dev/null", "w", stdout);
528 printf ("%s %s\n", token1, token2);
532 [ovs_cv_strtok_r_bug=no],
533 [ovs_cv_strtok_r_bug=yes],
534 [ovs_cv_strtok_r_bug=yes])])
535 if test $ovs_cv_strtok_r_bug = yes; then
536 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
537 [Define if strtok_r macro segfaults on some inputs])
541 dnl ----------------------------------------------------------------------
542 dnl These macros are from GNU PSPP, with the following original license:
543 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
544 dnl This file is free software; the Free Software Foundation
545 dnl gives unlimited permission to copy and/or distribute it,
546 dnl with or without modifications, as long as this notice is preserved.
548 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
549 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
550 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
551 [ovs_save_CFLAGS="$CFLAGS"
552 dnl Include -Werror in the compiler options, because without -Werror
553 dnl clang's GCC-compatible compiler driver does not return a failure
554 dnl exit status even though it complains about options it does not
557 dnl Also, check stderr as gcc exits with status 0 for options
558 dnl rejected at getopt level.
560 dnl % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
561 dnl gcc: unrecognized option '-Qunused-arguments'
564 CFLAGS="$CFLAGS $WERROR $1"
565 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [if test -s conftest.err && grep "unrecognized option" conftest.err; then ovs_cv_name[]=no; else ovs_cv_name[]=yes; fi], [ovs_cv_name[]=no])
566 CFLAGS="$ovs_save_CFLAGS"])
567 if test $ovs_cv_name = yes; then
568 m4_if([$2], [], [:], [$2])
570 m4_if([$3], [], [:], [$3])
576 dnl Check whether the C compiler accepts -Werror.
577 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
578 AC_DEFUN([OVS_CHECK_WERROR],
580 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
582 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
583 dnl Check whether the given C compiler OPTION is accepted.
584 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
585 AC_DEFUN([OVS_CHECK_CC_OPTION],
586 [AC_REQUIRE([OVS_CHECK_WERROR])
587 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
589 dnl OVS_ENABLE_OPTION([OPTION])
590 dnl Check whether the given C compiler OPTION is accepted.
591 dnl If so, add it to WARNING_FLAGS.
592 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
593 AC_DEFUN([OVS_ENABLE_OPTION],
594 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
595 AC_SUBST([WARNING_FLAGS])])
597 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
598 dnl Check whether the given C compiler OPTION is accepted.
599 dnl If so, enable the given Automake CONDITIONAL.
601 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
602 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
603 [OVS_CHECK_CC_OPTION(
604 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
605 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
606 dnl ----------------------------------------------------------------------
608 dnl Check for too-old XenServer.
609 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
610 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
611 [if test -e /etc/redhat-release; then
612 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
614 if test -z "$ovs_cv_xsversion"; then
615 ovs_cv_xsversion=none
617 case $ovs_cv_xsversion in
621 [[1-9]][[0-9]]* | dnl XenServer 10 or later
622 [[6-9]]* | dnl XenServer 6 or later
623 5.[[7-9]]* | dnl XenServer 5.7 or later
624 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
625 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
626 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
630 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.)])
634 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
636 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
637 dnl Runs 'if-true' if so, 'if-false' otherwise.
638 AC_DEFUN([OVS_CHECK_MAKE_IF],
640 [whether ${MAKE-make} has GNU make \$(if) extension],
641 [ovs_cv_gnu_make_if],
642 [cat <<'EOF' > conftest.mk
644 echo $(if x,y,z) > conftest.out
648 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
649 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
650 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
651 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
652 result=`cat conftest.out`
653 rm -f conftest.mk conftest.out
654 if test "X$result" = "Xy"; then
655 ovs_cv_gnu_make_if=yes
657 ovs_cv_gnu_make_if=no
660 dnl OVS_CHECK_GNU_MAKE
662 dnl Checks whether make is GNU make (because Linux kernel Makefiles
663 dnl only work with GNU make).
664 AC_DEFUN([OVS_CHECK_GNU_MAKE],
666 [whether ${MAKE-make} is GNU make],
669 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
670 ${MAKE-make} --version >conftest.out 2>&1
671 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
672 result=`cat conftest.out`
673 rm -f conftest.mk conftest.out
676 GNU*) ovs_cv_gnu_make=yes ;; # (
677 *) ovs_cv_gnu_make=no ;;
679 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
681 dnl OVS_CHECK_SPARSE_TARGET
683 dnl The "cgcc" script from "sparse" isn't very good at detecting the
684 dnl target for which the code is being built. This helps it out.
685 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
687 [target hint for cgcc],
688 [ac_cv_sparse_target],
689 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
690 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
691 [x86_64-*], [ac_cv_sparse_target=x86_64],
692 [ac_cv_sparse_target=other])])
693 AS_CASE([$ac_cv_sparse_target],
694 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
695 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
696 [SPARSEFLAGS= CGCCFLAGS=])
697 AC_SUBST([SPARSEFLAGS])
698 AC_SUBST([CGCCFLAGS])])
700 dnl OVS_SPARSE_EXTRA_INCLUDES
702 dnl The cgcc script from "sparse" does not search gcc's default
703 dnl search path. Get the default search path from GCC and pass
705 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
706 AC_SUBST([SPARSE_EXTRA_INCLUDES],
707 [`$CC -v -E - </dev/null 2>&1 >/dev/null | sed -n -e '/^#include.*search.*starts.*here:/,/^End.*of.*search.*list\./s/^ \(.*\)/-I \1/p' |grep -v /usr/lib | grep -x -v '\-I /usr/include' | tr \\\n ' ' `] ))
709 dnl OVS_ENABLE_SPARSE
710 AC_DEFUN([OVS_ENABLE_SPARSE],
711 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
712 AC_REQUIRE([OVS_CHECK_MAKE_IF])
713 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
716 AC_CONFIG_COMMANDS_PRE(
717 [if test $ovs_cv_gnu_make_if = yes; then
718 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
721 dnl OVS_PTHREAD_SET_NAME
723 dnl This checks for three known variants of pthreads functions for setting
724 dnl the name of the current thread:
726 dnl glibc: int pthread_setname_np(pthread_t, const char *name);
727 dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
728 dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
730 dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
731 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
734 dnl This macro defines:
736 dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
737 dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
738 dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
739 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
740 [AC_CHECK_FUNCS([pthread_set_name_np])
741 if test $ac_cv_func_pthread_set_name_np != yes; then
743 [for pthread_setname_np() variant],
744 [ovs_cv_pthread_setname_np],
746 [AC_LANG_PROGRAM([#include <pthread.h>
747 ], [pthread_setname_np(pthread_self(), "name");])],
748 [ovs_cv_pthread_setname_np=glibc],
750 [AC_LANG_PROGRAM([#include <pthread.h>
751 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
752 [ovs_cv_pthread_setname_np=netbsd],
753 [ovs_cv_pthread_setname_np=none])])])
754 case $ovs_cv_pthread_setname_np in # (
757 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
758 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
762 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
763 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
768 dnl OVS_CHECK_LINUX_HOST.
770 dnl Checks whether we're building for a Linux host, based on the presence of
771 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
772 dnl LINUX based on the result.
773 AC_DEFUN([OVS_CHECK_LINUX_HOST],
775 [whether __linux__ is defined],
778 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
780 [ovs_cv_linux=false])])
781 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])