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 0; then
140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 4.0.x is not supported (please refer to the FAQ for advice)])
142 elif test "$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=$RTE_SDK/lib
175 DPDK_LIB="-lintel_dpdk"
178 OVS_GREP_IFELSE([$RTE_SDK/include/rte_config.h], [define RTE_LIBRTE_VHOST_USER 1],
179 [], [AC_DEFINE([VHOST_CUSE], [1], [DPDK vhost-cuse support enabled, vhost-user disabled.])
180 DPDK_EXTRA_LIB="-lfuse"])
182 ovs_save_CFLAGS="$CFLAGS"
183 ovs_save_LDFLAGS="$LDFLAGS"
184 LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
185 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
187 # On some systems we have to add -ldl to link with dpdk
189 # This code, at first, tries to link without -ldl (""),
190 # then adds it and tries again.
191 # Before each attempt the search cache must be unset,
192 # otherwise autoconf will stick with the old result
196 for extras in "" "-ldl"; do
197 LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
199 [AC_LANG_PROGRAM([#include <rte_config.h>
200 #include <rte_eal.h>],
201 [int rte_argc; char ** rte_argv;
202 rte_eal_init(rte_argc, rte_argv);])],
208 if $found; then :; else
209 AC_MSG_ERROR([cannot link with dpdk])
211 CFLAGS="$ovs_save_CFLAGS"
212 LDFLAGS="$ovs_save_LDFLAGS"
213 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
214 OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE -mssse3"
216 # DPDK pmd drivers are not linked unless --whole-archive is used.
218 # This happens because the rest of the DPDK code doesn't use any symbol in
219 # the pmd driver objects, and the drivers register themselves using an
220 # __attribute__((constructor)) function.
222 # These options are specified inside a single -Wl directive to prevent
223 # autotools from reordering them.
224 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
225 AC_SUBST([DPDK_vswitchd_LDFLAGS])
226 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
232 AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
235 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
237 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
238 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
239 dnl <REGEX> translated to uppercase.
240 AC_DEFUN([OVS_GREP_IFELSE], [
241 AC_MSG_CHECKING([whether $2 matches in $1])
243 grep '$2' $1 >/dev/null 2>&1
248 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
255 AC_MSG_ERROR([grep exited with status $status])
259 AC_MSG_RESULT([file not found])
264 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
266 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
267 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
268 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
269 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
270 dnl translated to uppercase.
271 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
272 AC_MSG_CHECKING([whether $2 has member $3 in $1])
274 awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3' >/dev/null
279 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
286 AC_MSG_ERROR([grep exited with status $status])
290 AC_MSG_RESULT([file not found])
297 dnl Defines NAME to 1 in kcompat.h.
298 AC_DEFUN([OVS_DEFINE], [
299 echo '#define $1 1' >> datapath/linux/kcompat.h.new
302 dnl OVS_CHECK_LINUX_COMPAT
304 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
305 dnl the directory in $KBUILD.
306 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
307 rm -f datapath/linux/kcompat.h.new
308 mkdir -p datapath/linux
309 : > datapath/linux/kcompat.h.new
311 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
312 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
314 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
315 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
317 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
318 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
320 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
322 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
323 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
324 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
325 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
326 [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
328 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
329 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
330 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
331 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
332 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
333 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
334 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
335 OVS_GREP_IFELSE([$KSRC/include/linux/netfilter.h], [nf_hookfn.*nf_hook_ops],
336 [OVS_DEFINE([HAVE_NF_HOOKFN_ARG_OPS])])
338 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
340 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
341 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
342 [rcu_read_lock_held])])
343 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
345 # Check for the proto_data_valid member in struct sk_buff. The [^@]
346 # is necessary because some versions of this header remove the
347 # member but retain the kerneldoc comment that describes it (which
348 # starts with @). The brackets must be doubled because of m4
350 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
351 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
352 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [kfree_skb_list])
353 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
354 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
355 [OVS_DEFINE([HAVE_U16_RXHASH])])
356 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
357 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
358 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
359 [skb_copy_from_linear_data_offset])
360 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
361 [skb_reset_tail_pointer])
362 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
363 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
364 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
365 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
366 [OVS_DEFINE([HAVE_ICMP6_HDR])])
367 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
368 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
369 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
370 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
371 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
372 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
373 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
374 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
375 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
376 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
377 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
378 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
379 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
380 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
381 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
382 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
383 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
385 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
386 [OVS_DEFINE([HAVE_BOOL_TYPE])])
387 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
388 [OVS_DEFINE([HAVE_CSUM_TYPES])])
389 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
390 [OVS_DEFINE([HAVE_CSUM_TYPES])])
392 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
393 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
395 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
396 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
397 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
398 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
399 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
400 [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
401 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
402 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
403 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
405 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
406 [genl_multicast_group], [id])
408 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
409 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
410 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
411 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
412 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
413 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
414 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
415 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
417 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
419 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
420 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
421 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
422 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
425 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
427 OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
428 [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
429 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
430 [OVS_DEFINE([HAVE_VXLAN_METADATA])])
431 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
432 [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
433 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
434 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
435 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_set_csum])
436 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
437 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
438 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_GRE_CSUM],
439 [OVS_DEFINE([HAVE_SKB_GSO_GRE_CSUM])])
440 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_UDP_TUNNEL_CSUM],
441 [OVS_DEFINE([HAVE_SKB_GSO_UDP_TUNNEL_CSUM])])
442 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
443 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
445 if cmp -s datapath/linux/kcompat.h.new \
446 datapath/linux/kcompat.h >/dev/null 2>&1; then
447 rm datapath/linux/kcompat.h.new
449 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
453 dnl Checks for net/if_packet.h.
454 AC_DEFUN([OVS_CHECK_IF_PACKET],
455 [AC_CHECK_HEADER([net/if_packet.h],
456 [HAVE_IF_PACKET=yes],
458 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
459 if test "$HAVE_IF_PACKET" = yes; then
460 AC_DEFINE([HAVE_IF_PACKET], [1],
461 [Define to 1 if net/if_packet.h is available.])
464 dnl Checks for net/if_dl.h.
466 dnl (We use this as a proxy for checking whether we're building on FreeBSD
468 AC_DEFUN([OVS_CHECK_IF_DL],
469 [AC_CHECK_HEADER([net/if_dl.h],
472 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
473 if test "$HAVE_IF_DL" = yes; then
474 AC_DEFINE([HAVE_IF_DL], [1],
475 [Define to 1 if net/if_dl.h is available.])
477 # On these platforms we use libpcap to access network devices.
478 AC_SEARCH_LIBS([pcap_open_live], [pcap])
481 dnl Checks for buggy strtok_r.
483 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
484 dnl with optimization that can cause segfaults:
486 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
487 AC_DEFUN([OVS_CHECK_STRTOK_R],
489 [whether strtok_r macro segfaults on some inputs],
490 [ovs_cv_strtok_r_bug],
492 [AC_LANG_PROGRAM([#include <stdio.h>
495 [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
496 /* Assume bug is present, because relatively minor
497 changes in compiler settings (e.g. optimization
498 level) can make it crop up. */
501 char string[] = ":::";
502 char *save_ptr = (char *) 0xc0ffee;
503 char *token1, *token2;
504 token1 = strtok_r(string, ":", &save_ptr);
505 token2 = strtok_r(NULL, ":", &save_ptr);
506 freopen ("/dev/null", "w", stdout);
507 printf ("%s %s\n", token1, token2);
511 [ovs_cv_strtok_r_bug=no],
512 [ovs_cv_strtok_r_bug=yes],
513 [ovs_cv_strtok_r_bug=yes])])
514 if test $ovs_cv_strtok_r_bug = yes; then
515 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
516 [Define if strtok_r macro segfaults on some inputs])
520 dnl ----------------------------------------------------------------------
521 dnl These macros are from GNU PSPP, with the following original license:
522 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
523 dnl This file is free software; the Free Software Foundation
524 dnl gives unlimited permission to copy and/or distribute it,
525 dnl with or without modifications, as long as this notice is preserved.
527 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
528 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
529 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
530 [ovs_save_CFLAGS="$CFLAGS"
531 dnl Include -Werror in the compiler options, because without -Werror
532 dnl clang's GCC-compatible compiler driver does not return a failure
533 dnl exit status even though it complains about options it does not
536 dnl Also, check stderr as gcc exits with status 0 for options
537 dnl rejected at getopt level.
539 dnl % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
540 dnl gcc: unrecognized option '-Qunused-arguments'
543 CFLAGS="$CFLAGS $WERROR $1"
544 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [if test -s conftest.err && grep "unrecognized option" conftest.err; then ovs_cv_name[]=no; else ovs_cv_name[]=yes; fi], [ovs_cv_name[]=no])
545 CFLAGS="$ovs_save_CFLAGS"])
546 if test $ovs_cv_name = yes; then
547 m4_if([$2], [], [:], [$2])
549 m4_if([$3], [], [:], [$3])
555 dnl Check whether the C compiler accepts -Werror.
556 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
557 AC_DEFUN([OVS_CHECK_WERROR],
559 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
561 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
562 dnl Check whether the given C compiler OPTION is accepted.
563 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
564 AC_DEFUN([OVS_CHECK_CC_OPTION],
565 [AC_REQUIRE([OVS_CHECK_WERROR])
566 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
568 dnl OVS_ENABLE_OPTION([OPTION])
569 dnl Check whether the given C compiler OPTION is accepted.
570 dnl If so, add it to WARNING_FLAGS.
571 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
572 AC_DEFUN([OVS_ENABLE_OPTION],
573 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
574 AC_SUBST([WARNING_FLAGS])])
576 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
577 dnl Check whether the given C compiler OPTION is accepted.
578 dnl If so, enable the given Automake CONDITIONAL.
580 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
581 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
582 [OVS_CHECK_CC_OPTION(
583 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
584 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
585 dnl ----------------------------------------------------------------------
587 dnl Check for too-old XenServer.
588 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
589 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
590 [if test -e /etc/redhat-release; then
591 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
593 if test -z "$ovs_cv_xsversion"; then
594 ovs_cv_xsversion=none
596 case $ovs_cv_xsversion in
600 [[1-9]][[0-9]]* | dnl XenServer 10 or later
601 [[6-9]]* | dnl XenServer 6 or later
602 5.[[7-9]]* | dnl XenServer 5.7 or later
603 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
604 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
605 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
609 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.)])
613 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
615 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
616 dnl Runs 'if-true' if so, 'if-false' otherwise.
617 AC_DEFUN([OVS_CHECK_MAKE_IF],
619 [whether ${MAKE-make} has GNU make \$(if) extension],
620 [ovs_cv_gnu_make_if],
621 [cat <<'EOF' > conftest.mk
623 echo $(if x,y,z) > conftest.out
627 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
628 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
629 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
630 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
631 result=`cat conftest.out`
632 rm -f conftest.mk conftest.out
633 if test "X$result" = "Xy"; then
634 ovs_cv_gnu_make_if=yes
636 ovs_cv_gnu_make_if=no
639 dnl OVS_CHECK_GNU_MAKE
641 dnl Checks whether make is GNU make (because Linux kernel Makefiles
642 dnl only work with GNU make).
643 AC_DEFUN([OVS_CHECK_GNU_MAKE],
645 [whether ${MAKE-make} is GNU make],
648 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
649 ${MAKE-make} --version >conftest.out 2>&1
650 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
651 result=`cat conftest.out`
652 rm -f conftest.mk conftest.out
655 GNU*) ovs_cv_gnu_make=yes ;; # (
656 *) ovs_cv_gnu_make=no ;;
658 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
660 dnl OVS_CHECK_SPARSE_TARGET
662 dnl The "cgcc" script from "sparse" isn't very good at detecting the
663 dnl target for which the code is being built. This helps it out.
664 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
666 [target hint for cgcc],
667 [ac_cv_sparse_target],
668 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
669 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
670 [x86_64-*], [ac_cv_sparse_target=x86_64],
671 [ac_cv_sparse_target=other])])
672 AS_CASE([$ac_cv_sparse_target],
673 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
674 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
675 [SPARSEFLAGS= CGCCFLAGS=])
676 AC_SUBST([SPARSEFLAGS])
677 AC_SUBST([CGCCFLAGS])])
679 dnl OVS_SPARSE_EXTRA_INCLUDES
681 dnl The cgcc script from "sparse" does not search gcc's default
682 dnl search path. Get the default search path from GCC and pass
684 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
685 AC_SUBST([SPARSE_EXTRA_INCLUDES],
686 [`$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 ' ' `] ))
688 dnl OVS_ENABLE_SPARSE
689 AC_DEFUN([OVS_ENABLE_SPARSE],
690 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
691 AC_REQUIRE([OVS_CHECK_MAKE_IF])
692 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
695 AC_CONFIG_COMMANDS_PRE(
696 [if test $ovs_cv_gnu_make_if = yes; then
697 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
700 dnl OVS_PTHREAD_SET_NAME
702 dnl This checks for three known variants of pthreads functions for setting
703 dnl the name of the current thread:
705 dnl glibc: int pthread_setname_np(pthread_t, const char *name);
706 dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
707 dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
709 dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
710 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
713 dnl This macro defines:
715 dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
716 dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
717 dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
718 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
719 [AC_CHECK_FUNCS([pthread_set_name_np])
720 if test $ac_cv_func_pthread_set_name_np != yes; then
722 [for pthread_setname_np() variant],
723 [ovs_cv_pthread_setname_np],
725 [AC_LANG_PROGRAM([#include <pthread.h>
726 ], [pthread_setname_np(pthread_self(), "name");])],
727 [ovs_cv_pthread_setname_np=glibc],
729 [AC_LANG_PROGRAM([#include <pthread.h>
730 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
731 [ovs_cv_pthread_setname_np=netbsd],
732 [ovs_cv_pthread_setname_np=none])])])
733 case $ovs_cv_pthread_setname_np in # (
736 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
737 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
741 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
742 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
747 dnl OVS_CHECK_LINUX_HOST.
749 dnl Checks whether we're building for a Linux host, based on the presence of
750 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
751 dnl LINUX based on the result.
752 AC_DEFUN([OVS_CHECK_LINUX_HOST],
754 [whether __linux__ is defined],
757 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
759 [ovs_cv_linux=false])])
760 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])