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 "$version" -ge 3; then
137 if test "$version" = 3 && test "$patchlevel" -le 19; then
140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.19.x is not supported (please refer to the FAQ for advice)])
143 if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
144 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
149 if (test ! -e "$KBUILD"/include/linux/version.h && \
150 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
151 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
152 test ! -e "$KBUILD"/include/generated/autoconf.h); then
153 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
155 OVS_CHECK_LINUX_COMPAT
157 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
162 dnl Configure DPDK source tree
163 AC_DEFUN([OVS_CHECK_DPDK], [
165 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
166 [Specify the DPDK build directory])])
168 if test X"$with_dpdk" != X; then
171 DPDK_INCLUDE=$RTE_SDK/include
172 DPDK_LIB_DIR=$RTE_SDK/lib
173 DPDK_LIB="-lintel_dpdk"
174 DPDK_EXTRA_LIB="-lfuse"
176 ovs_save_CFLAGS="$CFLAGS"
177 ovs_save_LDFLAGS="$LDFLAGS"
178 LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
179 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
181 # On some systems we have to add -ldl to link with dpdk
183 # This code, at first, tries to link without -ldl (""),
184 # then adds it and tries again.
185 # Before each attempt the search cache must be unset,
186 # otherwise autoconf will stick with the old result
190 for extras in "" "-ldl"; do
191 LIBS="$DPDK_LIB $extras $save_LIBS $DPDK_EXTRA_LIB"
193 [AC_LANG_PROGRAM([#include <rte_config.h>
194 #include <rte_eal.h>],
195 [int rte_argc; char ** rte_argv;
196 rte_eal_init(rte_argc, rte_argv);])],
202 if $found; then :; else
203 AC_MSG_ERROR([cannot link with dpdk])
205 CFLAGS="$ovs_save_CFLAGS"
206 LDFLAGS="$ovs_save_LDFLAGS"
207 OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
208 OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
210 # DPDK pmd drivers are not linked unless --whole-archive is used.
212 # This happens because the rest of the DPDK code doesn't use any symbol in
213 # the pmd driver objects, and the drivers register themselves using an
214 # __attribute__((constructor)) function.
216 # These options are specified inside a single -Wl directive to prevent
217 # autotools from reordering them.
218 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
219 AC_SUBST([DPDK_vswitchd_LDFLAGS])
220 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
225 AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
228 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
230 dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
231 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
232 dnl <REGEX> translated to uppercase.
233 AC_DEFUN([OVS_GREP_IFELSE], [
234 AC_MSG_CHECKING([whether $2 matches in $1])
236 grep '$2' $1 >/dev/null 2>&1
241 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
248 AC_MSG_ERROR([grep exited with status $status])
252 AC_MSG_RESULT([file not found])
257 dnl OVS_FIND_FIELD_IFELSE(FILE, STRUCTURE, REGEX, [IF-MATCH], [IF-NO-MATCH])
259 dnl Looks for STRUCTURE in FILE. If it is found, greps for REGEX within the
260 dnl structure definition. If this is successful, runs IF-MATCH, otherwise
261 dnl IF_NO_MATCH. If IF-MATCH is empty then it defines to
262 dnl OVS_DEFINE(HAVE_<STRUCTURE>_WITH_<REGEX>), with <STRUCTURE> and <REGEX>
263 dnl translated to uppercase.
264 AC_DEFUN([OVS_FIND_FIELD_IFELSE], [
265 AC_MSG_CHECKING([whether $2 has member $3 in $1])
267 awk '/$2.{/,/^}/' $1 2>/dev/null | grep '$3'
272 m4_if([$4], [], [OVS_DEFINE([HAVE_]m4_toupper([$2])[_WITH_]m4_toupper([$3]))], [$4])
279 AC_MSG_ERROR([grep exited with status $status])
283 AC_MSG_RESULT([file not found])
290 dnl Defines NAME to 1 in kcompat.h.
291 AC_DEFUN([OVS_DEFINE], [
292 echo '#define $1 1' >> datapath/linux/kcompat.h.new
295 dnl OVS_CHECK_LINUX_COMPAT
297 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
298 dnl the directory in $KBUILD.
299 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
300 rm -f datapath/linux/kcompat.h.new
301 mkdir -p datapath/linux
302 : > datapath/linux/kcompat.h.new
304 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
305 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
307 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
308 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [IS_ERR_OR_NULL])
310 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
311 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
313 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
315 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
316 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
317 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
318 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [inet_get_local_port_range.*net],
319 [OVS_DEFINE([HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET])])
321 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
322 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
323 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
324 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
325 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
326 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
327 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
329 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
331 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
332 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
333 [rcu_read_lock_held])])
334 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
336 # Check for the proto_data_valid member in struct sk_buff. The [^@]
337 # is necessary because some versions of this header remove the
338 # member but retain the kerneldoc comment that describes it (which
339 # starts with @). The brackets must be doubled because of m4
341 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
342 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
343 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
344 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
345 [OVS_DEFINE([HAVE_U16_RXHASH])])
346 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
347 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
348 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
349 [skb_copy_from_linear_data_offset])
350 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
351 [skb_reset_tail_pointer])
352 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
353 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
354 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
355 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
356 [OVS_DEFINE([HAVE_ICMP6_HDR])])
357 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
358 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
359 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
360 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
361 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
362 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
363 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
364 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
365 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
366 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
367 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
368 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [int.skb_zerocopy(],
369 [OVS_DEFINE([HAVE_SKB_ZEROCOPY])])
370 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
371 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_ensure_writable])
372 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_pop])
373 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_vlan_push])
375 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
376 [OVS_DEFINE([HAVE_BOOL_TYPE])])
377 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
378 [OVS_DEFINE([HAVE_CSUM_TYPES])])
379 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
380 [OVS_DEFINE([HAVE_CSUM_TYPES])])
382 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
383 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
385 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_has_listeners])
386 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [mcgrp_offset])
387 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
388 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_new_unicast])
389 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [netlink_has_listeners(net->genl_sock],
390 [OVS_DEFINE([HAVE_GENL_HAS_LISTENERS_TAKES_NET])])
391 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genlmsg_parse])
392 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [genl_notify.*family],
393 [OVS_DEFINE([HAVE_GENL_NOTIFY_TAKES_FAMILY])])
395 OVS_FIND_FIELD_IFELSE([$KSRC/include/net/genetlink.h],
396 [genl_multicast_group], [id])
398 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
399 OVS_GREP_IFELSE([$KSRC/include/net/ipv6.h], [IP6_FH_F_SKIP_RH])
400 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
401 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
402 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
403 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
404 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
405 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_is_last])
407 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
409 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
410 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
411 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_insert_tag_set_proto])
412 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [__vlan_insert_tag])
415 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
417 OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
418 [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
419 OVS_GREP_IFELSE([$KSRC/include/net/vxlan.h], [struct vxlan_metadata],
420 [OVS_DEFINE([HAVE_VXLAN_METADATA])])
421 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_flow_src_port],
422 [OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [inet_get_local_port_range(net],
423 [OVS_DEFINE([HAVE_UDP_FLOW_SRC_PORT])])])
424 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_v4_check])
425 OVS_GREP_IFELSE([$KSRC/include/net/udp.h], [udp_set_csum])
426 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [ignore_df:1],
427 [OVS_DEFINE([HAVE_IGNORE_DF_RENAME])])
428 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_GRE_CSUM],
429 [OVS_DEFINE([HAVE_SKB_GSO_GRE_CSUM])])
430 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [SKB_GSO_UDP_TUNNEL_CSUM],
431 [OVS_DEFINE([HAVE_SKB_GSO_UDP_TUNNEL_CSUM])])
432 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/netdevice.h], [NET_NAME_UNKNOWN],
433 [OVS_DEFINE([HAVE_NET_NAME_UNKNOWN])])
435 if cmp -s datapath/linux/kcompat.h.new \
436 datapath/linux/kcompat.h >/dev/null 2>&1; then
437 rm datapath/linux/kcompat.h.new
439 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
443 dnl Checks for net/if_packet.h.
444 AC_DEFUN([OVS_CHECK_IF_PACKET],
445 [AC_CHECK_HEADER([net/if_packet.h],
446 [HAVE_IF_PACKET=yes],
448 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
449 if test "$HAVE_IF_PACKET" = yes; then
450 AC_DEFINE([HAVE_IF_PACKET], [1],
451 [Define to 1 if net/if_packet.h is available.])
454 dnl Checks for net/if_dl.h.
456 dnl (We use this as a proxy for checking whether we're building on FreeBSD
458 AC_DEFUN([OVS_CHECK_IF_DL],
459 [AC_CHECK_HEADER([net/if_dl.h],
462 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
463 if test "$HAVE_IF_DL" = yes; then
464 AC_DEFINE([HAVE_IF_DL], [1],
465 [Define to 1 if net/if_dl.h is available.])
467 # On these platforms we use libpcap to access network devices.
468 AC_SEARCH_LIBS([pcap_open_live], [pcap])
471 dnl Checks for buggy strtok_r.
473 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
474 dnl with optimization that can cause segfaults:
476 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
477 AC_DEFUN([OVS_CHECK_STRTOK_R],
479 [whether strtok_r macro segfaults on some inputs],
480 [ovs_cv_strtok_r_bug],
482 [AC_LANG_PROGRAM([#include <stdio.h>
485 [[#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8
486 /* Assume bug is present, because relatively minor
487 changes in compiler settings (e.g. optimization
488 level) can make it crop up. */
491 char string[] = ":::";
492 char *save_ptr = (char *) 0xc0ffee;
493 char *token1, *token2;
494 token1 = strtok_r(string, ":", &save_ptr);
495 token2 = strtok_r(NULL, ":", &save_ptr);
496 freopen ("/dev/null", "w", stdout);
497 printf ("%s %s\n", token1, token2);
501 [ovs_cv_strtok_r_bug=no],
502 [ovs_cv_strtok_r_bug=yes],
503 [ovs_cv_strtok_r_bug=yes])])
504 if test $ovs_cv_strtok_r_bug = yes; then
505 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
506 [Define if strtok_r macro segfaults on some inputs])
510 dnl ----------------------------------------------------------------------
511 dnl These macros are from GNU PSPP, with the following original license:
512 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
513 dnl This file is free software; the Free Software Foundation
514 dnl gives unlimited permission to copy and/or distribute it,
515 dnl with or without modifications, as long as this notice is preserved.
517 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
518 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
519 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
520 [ovs_save_CFLAGS="$CFLAGS"
521 dnl Include -Werror in the compiler options, because without -Werror
522 dnl clang's GCC-compatible compiler driver does not return a failure
523 dnl exit status even though it complains about options it does not
526 dnl Also, check stderr as gcc exits with status 0 for options
527 dnl rejected at getopt level.
529 dnl % gcc -g -c -Werror -Qunused-arguments /tmp/a.c; echo $?
530 dnl gcc: unrecognized option '-Qunused-arguments'
533 CFLAGS="$CFLAGS $WERROR $1"
534 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [if test -s conftest.err && grep "unrecognized option" conftest.err; then ovs_cv_name[]=no; else ovs_cv_name[]=yes; fi], [ovs_cv_name[]=no])
535 CFLAGS="$ovs_save_CFLAGS"])
536 if test $ovs_cv_name = yes; then
537 m4_if([$2], [], [:], [$2])
539 m4_if([$3], [], [:], [$3])
545 dnl Check whether the C compiler accepts -Werror.
546 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
547 AC_DEFUN([OVS_CHECK_WERROR],
549 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
551 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
552 dnl Check whether the given C compiler OPTION is accepted.
553 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
554 AC_DEFUN([OVS_CHECK_CC_OPTION],
555 [AC_REQUIRE([OVS_CHECK_WERROR])
556 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
558 dnl OVS_ENABLE_OPTION([OPTION])
559 dnl Check whether the given C compiler OPTION is accepted.
560 dnl If so, add it to WARNING_FLAGS.
561 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
562 AC_DEFUN([OVS_ENABLE_OPTION],
563 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
564 AC_SUBST([WARNING_FLAGS])])
566 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
567 dnl Check whether the given C compiler OPTION is accepted.
568 dnl If so, enable the given Automake CONDITIONAL.
570 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
571 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
572 [OVS_CHECK_CC_OPTION(
573 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
574 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
575 dnl ----------------------------------------------------------------------
577 dnl Check for too-old XenServer.
578 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
579 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
580 [if test -e /etc/redhat-release; then
581 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
583 if test -z "$ovs_cv_xsversion"; then
584 ovs_cv_xsversion=none
586 case $ovs_cv_xsversion in
590 [[1-9]][[0-9]]* | dnl XenServer 10 or later
591 [[6-9]]* | dnl XenServer 6 or later
592 5.[[7-9]]* | dnl XenServer 5.7 or later
593 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
594 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
595 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
599 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.)])
603 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
605 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
606 dnl Runs 'if-true' if so, 'if-false' otherwise.
607 AC_DEFUN([OVS_CHECK_MAKE_IF],
609 [whether ${MAKE-make} has GNU make \$(if) extension],
610 [ovs_cv_gnu_make_if],
611 [cat <<'EOF' > conftest.mk
613 echo $(if x,y,z) > conftest.out
617 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
618 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
619 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
620 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
621 result=`cat conftest.out`
622 rm -f conftest.mk conftest.out
623 if test "X$result" = "Xy"; then
624 ovs_cv_gnu_make_if=yes
626 ovs_cv_gnu_make_if=no
629 dnl OVS_CHECK_GNU_MAKE
631 dnl Checks whether make is GNU make (because Linux kernel Makefiles
632 dnl only work with GNU make).
633 AC_DEFUN([OVS_CHECK_GNU_MAKE],
635 [whether ${MAKE-make} is GNU make],
638 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
639 ${MAKE-make} --version >conftest.out 2>&1
640 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
641 result=`cat conftest.out`
642 rm -f conftest.mk conftest.out
645 GNU*) ovs_cv_gnu_make=yes ;; # (
646 *) ovs_cv_gnu_make=no ;;
648 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
650 dnl OVS_CHECK_SPARSE_TARGET
652 dnl The "cgcc" script from "sparse" isn't very good at detecting the
653 dnl target for which the code is being built. This helps it out.
654 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
656 [target hint for cgcc],
657 [ac_cv_sparse_target],
658 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
659 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
660 [x86_64-*], [ac_cv_sparse_target=x86_64],
661 [ac_cv_sparse_target=other])])
662 AS_CASE([$ac_cv_sparse_target],
663 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
664 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
665 [SPARSEFLAGS= CGCCFLAGS=])
666 AC_SUBST([SPARSEFLAGS])
667 AC_SUBST([CGCCFLAGS])])
669 dnl OVS_SPARSE_EXTRA_INCLUDES
671 dnl The cgcc script from "sparse" does not search gcc's default
672 dnl search path. Get the default search path from GCC and pass
674 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
675 AC_SUBST([SPARSE_EXTRA_INCLUDES],
676 [`$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 ' ' `] ))
678 dnl OVS_ENABLE_SPARSE
679 AC_DEFUN([OVS_ENABLE_SPARSE],
680 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
681 AC_REQUIRE([OVS_CHECK_MAKE_IF])
682 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
685 AC_CONFIG_COMMANDS_PRE(
686 [if test $ovs_cv_gnu_make_if = yes; then
687 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
690 dnl OVS_PTHREAD_SET_NAME
692 dnl This checks for three known variants of pthreads functions for setting
693 dnl the name of the current thread:
695 dnl glibc: int pthread_setname_np(pthread_t, const char *name);
696 dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
697 dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
699 dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
700 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
703 dnl This macro defines:
705 dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
706 dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
707 dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
708 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
709 [AC_CHECK_FUNCS([pthread_set_name_np])
710 if test $ac_cv_func_pthread_set_name_np != yes; then
712 [for pthread_setname_np() variant],
713 [ovs_cv_pthread_setname_np],
715 [AC_LANG_PROGRAM([#include <pthread.h>
716 ], [pthread_setname_np(pthread_self(), "name");])],
717 [ovs_cv_pthread_setname_np=glibc],
719 [AC_LANG_PROGRAM([#include <pthread.h>
720 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
721 [ovs_cv_pthread_setname_np=netbsd],
722 [ovs_cv_pthread_setname_np=none])])])
723 case $ovs_cv_pthread_setname_np in # (
726 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
727 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
731 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
732 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
737 dnl OVS_CHECK_LINUX_HOST.
739 dnl Checks whether we're building for a Linux host, based on the presence of
740 dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
741 dnl LINUX based on the result.
742 AC_DEFUN([OVS_CHECK_LINUX_HOST],
744 [whether __linux__ is defined],
747 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
749 [ovs_cv_linux=false])])
750 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])