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datapath: Add this_cpu_{read, inc, dec} APIs for backward compatibility
[mirror_ovs.git] / acinclude.m4
CommitLineData
064af421
BP		 1# -*- autoconf -*-
2
5020f5f0 3# Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
064af421 4#
a14bc59f
BP		 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:
064af421 8#
a14bc59f
BP		 9# http://www.apache.org/licenses/LICENSE-2.0
10#
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.
064af421 16
a64e37a1
BP		 17dnl OVS_ENABLE_WERROR
18AC_DEFUN([OVS_ENABLE_WERROR],
19 [AC_ARG_ENABLE(
20 [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"
26 fi])])
27
e3438006 28dnl OVS_CHECK_LINUX
064af421
BP		 29dnl
30dnl Configure linux kernel source tree
e3438006 31AC_DEFUN([OVS_CHECK_LINUX], [
8a2d6596
BP		 32 AC_ARG_WITH([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
a0903134
YT		 38 (usually figured out automatically from build
39 directory)])])
8a2d6596
BP		 40
41 # Deprecated equivalents to --with-linux, --with-linux-source.
42 AC_ARG_WITH([l26])
43 AC_ARG_WITH([l26-source])
44
45 if test X"$with_linux" != X; then
46 KBUILD=$with_linux
47 elif test X"$with_l26" != X; then
48 KBUILD=$with_l26
49 AC_MSG_WARN([--with-l26 is deprecated, please use --with-linux instead])
50 else
51 KBUILD=
52 fi
53
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
58 KSRC=$with_l26_source
59 AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
0a89c170
BP		 60 else
61 KSRC=
8a2d6596
BP		 62 fi
63 elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64 AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
65 fi
66
e3438006
BP		 67 if test -n "$KBUILD"; then
68 KBUILD=`eval echo "$KBUILD"`
69 case $KBUILD in
0b6d72fc 70 /*) ;;
e3438006 71 *) KBUILD=`pwd`/$KBUILD ;;
0b6d72fc 72 esac
064af421 73
7c9e113b
BP		 74 # The build directory is what the user provided.
75 # Make sure that it exists.
8a2d6596 76 AC_MSG_CHECKING([for Linux build directory])
e3438006 77 if test -d "$KBUILD"; then
a0903134
YT		 78 AC_MSG_RESULT([$KBUILD])
79 AC_SUBST(KBUILD)
064af421 80 else
a0903134
YT		 81 AC_MSG_RESULT([no])
82 AC_ERROR([source dir $KBUILD doesn't exist])
064af421
BP		 83 fi
84
7c9e113b 85 # Debian breaks kernel headers into "source" header and "build" headers.
e3438006 86 # We want the source headers, but $KBUILD gives us the "build" headers.
7c9e113b 87 # Use heuristics to find the source headers.
8a2d6596 88 AC_MSG_CHECKING([for Linux source directory])
e3438006
BP		 89 if test -n "$KSRC"; then
90 KSRC=`eval echo "$KSRC"`
91 case $KSRC in
f5fb5de6 92 /*) ;;
e3438006 93 *) KSRC=`pwd`/$KSRC ;;
b57f675c 94 esac
e3438006 95 if test ! -e $KSRC/include/linux/kernel.h; then
53319f95 96 AC_MSG_ERROR([$KSRC is not a kernel source directory])
f5fb5de6
BP		 97 fi
98 else
e3438006
BP		 99 KSRC=$KBUILD
100 if test ! -e $KSRC/include/linux/kernel.h; then
fe0731b1
BP		 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 # (
108 */build)
109 KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
110 ;; # (
111 *)
112 KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
113 ;;
114 esac
115 fi
f5fb5de6 116 fi
fe0731b1 117 if test ! -e "$KSRC"/include/linux/kernel.h; then
8a2d6596 118 AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
7c9e113b
BP		 119 fi
120 fi
e3438006 121 AC_MSG_RESULT([$KSRC])
7c9e113b
BP		 122
123 AC_MSG_CHECKING([for kernel version])
71fe9970 124 version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
e3438006
BP		 125 patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
126 sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
71fe9970 127 if test X"$version" = X || test X"$patchlevel" = X; then
7c9e113b 128 AC_ERROR([cannot determine kernel version])
71fe9970
BP		 129 elif test X"$sublevel" = X; then
130 kversion=$version.$patchlevel
131 else
132 kversion=$version.$patchlevel.$sublevel
7c9e113b 133 fi
71fe9970
BP		 134 AC_MSG_RESULT([$kversion])
135
136 if test "$version" -ge 3; then
e2f3178f 137 if test "$version" = 3 && test "$patchlevel" -le 14; then
d76aabea
PS		 138 : # Linux 3.x
139 else
e2f3178f 140 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.14.x is not supported (please refer to the FAQ for advice)])
d76aabea 141 fi
71fe9970 142 else
d76aabea
PS		 143 if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
144 AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
7c9e113b 145 else
d76aabea 146 : # Linux 2.6.x
7c9e113b 147 fi
064af421 148 fi
2520f452
IY		 149 if (test ! -e "$KBUILD"/include/linux/version.h && \
150 test ! -e "$KBUILD"/include/generated/uapi/linux/version.h)|| \
e3438006
BP		 151 (test ! -e "$KBUILD"/include/linux/autoconf.h && \
152 test ! -e "$KBUILD"/include/generated/autoconf.h); then
a0903134 153 AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
064af421 154 fi
e3438006 155 OVS_CHECK_LINUX_COMPAT
064af421 156 fi
e3438006 157 AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
064af421
BP		 158])
159
8a9562d2
PS		 160dnl OVS_CHECK_DPDK
161dnl
162dnl Configure DPDK source tree
163AC_DEFUN([OVS_CHECK_DPDK], [
164 AC_ARG_WITH([dpdk],
165 [AC_HELP_STRING([--with-dpdk=/path/to/dpdk],
e2e54517 166 [Specify the DPDK build directory])])
8a9562d2
PS		 167
168 if test X"$with_dpdk" != X; then
169 RTE_SDK=$with_dpdk
170
171 DPDK_INCLUDE=$RTE_SDK/include
172 DPDK_LIB_DIR=$RTE_SDK/lib
d7310583 173 DPDK_LIB=-lintel_dpdk
8a9562d2 174
c1223b11
DDP		 175 LDFLAGS="$LDFLAGS -L$DPDK_LIB_DIR"
176 CFLAGS="$CFLAGS -I$DPDK_INCLUDE"
177
178 # On some systems we have to add -ldl to link with dpdk
179 #
180 # This code, at first, tries to link without -ldl (""),
181 # then adds it and tries again.
182 # Before each attempt the search cache must be unset,
183 # otherwise autoconf will stick with the old result
184
185 found=false
186 save_LIBS=$LIBS
187 for extras in "" "-ldl"; do
d7310583 188 LIBS="$DPDK_LIB $extras $save_LIBS"
c1223b11
DDP		 189 AC_LINK_IFELSE(
190 [AC_LANG_PROGRAM([#include <rte_config.h>
191 #include <rte_eal.h>],
192 [int rte_argc; char ** rte_argv;
193 rte_eal_init(rte_argc, rte_argv);])],
194 [found=true])
195 if $found; then
196 break
197 fi
198 done
199 if $found; then :; else
200 AC_MSG_ERROR([cannot link with dpdk])
201 fi
8a9562d2 202
d7310583
DDP		 203 # DPDK 1.7.0 pmd drivers are not linked unless --whole-archive is used.
204 #
205 # This happens because the rest of the DPDK code doesn't use any symbol in
206 # the pmd driver objects, and the drivers register themselves using an
207 # __attribute__((constructor)) function.
208 #
209 # These options are specified inside a single -Wl directive to prevent
210 # autotools from reordering them.
9475dfeb
DDP		 211 DPDK_vswitchd_LDFLAGS=-Wl,--whole-archive,$DPDK_LIB,--no-whole-archive
212 AC_SUBST([DPDK_vswitchd_LDFLAGS])
8a9562d2
PS		 213 AC_DEFINE([DPDK_NETDEV], [1], [System uses the DPDK module.])
214 else
215 RTE_SDK=
216 fi
217
218 AM_CONDITIONAL([DPDK_NETDEV], test -n "$RTE_SDK")
219])
220
8828e5c7 221dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
064af421
BP		 222dnl
223dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
8828e5c7
BP		 224dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
225dnl <REGEX> translated to uppercase.
064af421
BP		 226AC_DEFUN([OVS_GREP_IFELSE], [
227 AC_MSG_CHECKING([whether $2 matches in $1])
7507ec48
JG		 228 if test -f $1; then
229 grep '$2' $1 >/dev/null 2>&1
230 status=$?
231 case $status in
232 0)
233 AC_MSG_RESULT([yes])
8828e5c7 234 m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
7507ec48
JG		 235 ;;
236 1)
237 AC_MSG_RESULT([no])
238 $4
239 ;;
240 *)
241 AC_MSG_ERROR([grep exited with status $status])
242 ;;
243 esac
244 else
245 AC_MSG_RESULT([file not found])
246 $4
247 fi
064af421
BP		 248])
249
250dnl OVS_DEFINE(NAME)
251dnl
252dnl Defines NAME to 1 in kcompat.h.
253AC_DEFUN([OVS_DEFINE], [
22bcc0e7 254 echo '#define $1 1' >> datapath/linux/kcompat.h.new
064af421
BP		 255])
256
064af421 257AC_DEFUN([OVS_CHECK_LOG2_H], [
e3438006
BP		 258 AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
259 if test -e $KSRC/include/linux/log2.h; then
064af421
BP		 260 AC_MSG_RESULT([yes])
261 OVS_DEFINE([HAVE_LOG2_H])
262 else
263 AC_MSG_RESULT([no])
264 fi
265])
266
e3438006 267dnl OVS_CHECK_LINUX_COMPAT
064af421
BP		 268dnl
269dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
e3438006
BP		 270dnl the directory in $KBUILD.
271AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
22bcc0e7
JG		 272 rm -f datapath/linux/kcompat.h.new
273 mkdir -p datapath/linux
274 : > datapath/linux/kcompat.h.new
4aa13c0c 275
e3438006 276 OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
25fb3596
JG		 277 [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
278
e3438006 279 OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
4aa13c0c 280
d923a695 281 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
e2f3178f 282 OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [ether_addr_copy])
d923a695
JG		 283
284 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
285
e3438006 286 OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
2ea82414
PS		 287 OVS_GREP_IFELSE([$KSRC/include/net/ip.h], [__ip_select_ident.*dst_entry],
288 [OVS_DEFINE([HAVE_IP_SELECT_IDENT_USING_DST_ENTRY])])
4aa13c0c 289
e3438006
BP		 290 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
291 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
292 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
42d5dd95
TG		 293 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
294 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
d1890de5 295 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
e2f3178f
PK		 296 OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [pcpu_sw_netstats])
297
298 OVS_GREP_IFELSE([$KSRC/include/linux/random.h], [prandom_u32])
4aa13c0c 299
e3438006
BP		 300 OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
301 [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
cf6cb3a2 302 [rcu_read_lock_held])])
8fa52250 303 OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
cf6cb3a2 304
6a33828d
BP		 305 # Check for the proto_data_valid member in struct sk_buff. The [^@]
306 # is necessary because some versions of this header remove the
307 # member but retain the kerneldoc comment that describes it (which
308 # starts with @). The brackets must be doubled because of m4
309 # quoting rules.
e3438006 310 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
6a33828d 311 [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
60c4904f 312 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
5640cbd8
JG		 313 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [u16.*rxhash],
314 [OVS_DEFINE([HAVE_U16_RXHASH])])
e3438006 315 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
85444c3f 316 [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
e3438006 317 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
8828e5c7 318 [skb_copy_from_linear_data_offset])
b9c15df9
PS		 319 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
320 [skb_reset_tail_pointer])
e3438006
BP		 321 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
322 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
4aa13c0c 323 [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
e3438006 324 OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
d31f1109 325 [OVS_DEFINE([HAVE_ICMP6_HDR])])
e3438006 326 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
4aa13c0c 327 [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
e3438006 328 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
6c4ea27c 329 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
da4bbeb7 330 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
0aa6fda7 331 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
d923a695 332 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
dc0d542d 333 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
1edc458d 334 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_orphan_frags])
e2f3178f
PK		 335 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_get_hash])
336 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_clear_hash])
9bbf88b2 337 OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [l4_rxhash])
4aa13c0c 338
e3438006 339 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
4aa13c0c 340 [OVS_DEFINE([HAVE_BOOL_TYPE])])
e3438006 341 OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
e215ebca 342 [OVS_DEFINE([HAVE_CSUM_TYPES])])
8dbe1f9f
PS		 343 OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
344 [OVS_DEFINE([HAVE_CSUM_TYPES])])
4aa13c0c 345
e3438006
BP		 346 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
347 OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
4aa13c0c 348
14002a59 349 OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
cc1d0dea 350 OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
e3438006 351 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
42d5dd95
TG		 352 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
353 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
354 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
e3438006 355 OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
4aa13c0c 356
c4e976db
JG		 357 OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
358
e3438006 359 OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
431488e6
BP		 360 [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
361
42d5dd95
TG		 362 OVS_GREP_IFELSE([$KSRC/include/linux/percpu.h], [this_cpu_ptr])
363
09f27436
JG		 364 OVS_GREP_IFELSE([$KSRC/include/linux/u64_stats_sync.h], [u64_stats_fetch_begin_irq])
365
f285d3e7
TG		 366 OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
367 [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
368
064af421 369 OVS_CHECK_LOG2_H
4aa13c0c 370
22bcc0e7
JG		 371 if cmp -s datapath/linux/kcompat.h.new \
372 datapath/linux/kcompat.h >/dev/null 2>&1; then
373 rm datapath/linux/kcompat.h.new
064af421 374 else
22bcc0e7 375 mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
064af421
BP		 376 fi
377])
378
379dnl Checks for net/if_packet.h.
380AC_DEFUN([OVS_CHECK_IF_PACKET],
381 [AC_CHECK_HEADER([net/if_packet.h],
382 [HAVE_IF_PACKET=yes],
383 [HAVE_IF_PACKET=no])
384 AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
385 if test "$HAVE_IF_PACKET" = yes; then
386 AC_DEFINE([HAVE_IF_PACKET], [1],
387 [Define to 1 if net/if_packet.h is available.])
388 fi])
389
f6eb6b20 390dnl Checks for net/if_dl.h.
d30e714c 391dnl
d23fa2ed
YT		 392dnl (We use this as a proxy for checking whether we're building on FreeBSD
393dnl or NetBSD.)
9360d9b7
EM		 394AC_DEFUN([OVS_CHECK_IF_DL],
395 [AC_CHECK_HEADER([net/if_dl.h],
396 [HAVE_IF_DL=yes],
397 [HAVE_IF_DL=no])
398 AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
399 if test "$HAVE_IF_DL" = yes; then
400 AC_DEFINE([HAVE_IF_DL], [1],
401 [Define to 1 if net/if_dl.h is available.])
d30e714c 402
d23fa2ed 403 # On these platforms we use libpcap to access network devices.
d30e714c 404 AC_SEARCH_LIBS([pcap_open_live], [pcap])
9360d9b7
EM		 405 fi])
406
e50097d2
BP		 407dnl Checks for buggy strtok_r.
408dnl
409dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
410dnl with optimization that can cause segfaults:
411dnl
412dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
413AC_DEFUN([OVS_CHECK_STRTOK_R],
414 [AC_CACHE_CHECK(
415 [whether strtok_r macro segfaults on some inputs],
416 [ovs_cv_strtok_r_bug],
417 [AC_RUN_IFELSE(
418 [AC_LANG_PROGRAM([#include <stdio.h>
419 #include <string.h>
420 ],
421 [[char string[] = ":::";
422 char *save_ptr = (char *) 0xc0ffee;
423 char *token1, *token2;
424 token1 = strtok_r(string, ":", &save_ptr);
425 token2 = strtok_r(NULL, ":", &save_ptr);
5819a7cd 426 freopen ("/dev/null", "w", stdout);
e50097d2
BP		 427 printf ("%s %s\n", token1, token2);
428 return 0;
429 ]])],
430 [ovs_cv_strtok_r_bug=no],
431 [ovs_cv_strtok_r_bug=yes],
432 [ovs_cv_strtok_r_bug=yes])])
433 if test $ovs_cv_strtok_r_bug = yes; then
434 AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
435 [Define if strtok_r macro segfaults on some inputs])
436 fi
437])
438
064af421
BP		 439dnl ----------------------------------------------------------------------
440dnl These macros are from GNU PSPP, with the following original license:
441dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
442dnl This file is free software; the Free Software Foundation
443dnl gives unlimited permission to copy and/or distribute it,
444dnl with or without modifications, as long as this notice is preserved.
445
50194820 446AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
7c96151e 447 m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
064af421
BP		 448 AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
449 [ovs_save_CFLAGS="$CFLAGS"
50194820
BP		 450 dnl Include -Werror in the compiler options, because without -Werror
451 dnl clang's GCC-compatible compiler driver does not return a failure
452 dnl exit status even though it complains about options it does not
453 dnl understand.
454 CFLAGS="$CFLAGS $WERROR $1"
064af421
BP		 455 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
456 CFLAGS="$ovs_save_CFLAGS"])
457 if test $ovs_cv_name = yes; then
83f6c050 458 m4_if([$2], [], [:], [$2])
064af421
BP		 459 else
460 m4_if([$3], [], [:], [$3])
461 fi
462])
463
50194820
BP		 464dnl OVS_CHECK_WERROR
465dnl
466dnl Check whether the C compiler accepts -Werror.
467dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
468AC_DEFUN([OVS_CHECK_WERROR],
469 [WERROR=
470 _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
471
472dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
473dnl Check whether the given C compiler OPTION is accepted.
474dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
475AC_DEFUN([OVS_CHECK_CC_OPTION],
476 [AC_REQUIRE([OVS_CHECK_WERROR])
477 _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
478
064af421
BP		 479dnl OVS_ENABLE_OPTION([OPTION])
480dnl Check whether the given C compiler OPTION is accepted.
d161c099 481dnl If so, add it to WARNING_FLAGS.
064af421
BP		 482dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
483AC_DEFUN([OVS_ENABLE_OPTION],
d161c099
BP		 484 [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
485 AC_SUBST([WARNING_FLAGS])])
c72e245a
BP		 486
487dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
488dnl Check whether the given C compiler OPTION is accepted.
489dnl If so, enable the given Automake CONDITIONAL.
490
491dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
492AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
493 [OVS_CHECK_CC_OPTION(
494 [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
495 AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
064af421 496dnl ----------------------------------------------------------------------
ed2d4f6a
BP		 497
498dnl Check for too-old XenServer.
499AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
500 [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
501 [if test -e /etc/redhat-release; then
502 ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
503 fi
504 if test -z "$ovs_cv_xsversion"; then
505 ovs_cv_xsversion=none
506 fi])
507 case $ovs_cv_xsversion in
508 none)
509 ;;
510
511 [[1-9]][[0-9]]* | dnl XenServer 10 or later
512 [[6-9]]* | dnl XenServer 6 or later
513 5.[[7-9]]* | dnl XenServer 5.7 or later
514 5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.1000 or later
515 5.6.[[2-9]][[0-9]][[0-9]]* | dnl XenServer 5.6.200 or later
516 5.6.1[[0-9]][[0-9]]) dnl Xenserver 5.6.100 or later
517 ;;
518
519 *)
520 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.)])
521 ;;
522 esac])
29d935d6
BP		 523
524dnl OVS_MAKE_HAS_IF([if-true], [if-false])
525dnl
526dnl Checks whether make has the GNU make $(if condition,then,else) extension.
527dnl Runs 'if-true' if so, 'if-false' otherwise.
372d58a4 528AC_DEFUN([OVS_CHECK_MAKE_IF],
29d935d6
BP		 529 [AC_CACHE_CHECK(
530 [whether ${MAKE-make} has GNU make \$(if) extension],
531 [ovs_cv_gnu_make_if],
532 [cat <<'EOF' > conftest.mk
533conftest.out:
380f86e4 534 echo $(if x,y,z) > conftest.out
29d935d6
BP		 535.PHONY: all
536EOF
537 rm -f conftest.out
538 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
539 ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
540 AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
541 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
542 result=`cat conftest.out`
543 rm -f conftest.mk conftest.out
544 if test "X$result" = "Xy"; then
545 ovs_cv_gnu_make_if=yes
546 else
547 ovs_cv_gnu_make_if=no
372d58a4 548 fi])])
29d935d6 549
b4e1bf8b
BP		 550dnl OVS_CHECK_GNU_MAKE
551dnl
552dnl Checks whether make is GNU make (because Linux kernel Makefiles
553dnl only work with GNU make).
554AC_DEFUN([OVS_CHECK_GNU_MAKE],
555 [AC_CACHE_CHECK(
556 [whether ${MAKE-make} is GNU make],
557 [ovs_cv_gnu_make],
558 [rm -f conftest.out
559 AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
560 ${MAKE-make} --version >conftest.out 2>&1
561 cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
562 result=`cat conftest.out`
563 rm -f conftest.mk conftest.out
564
565 case $result in # (
566 GNU*) ovs_cv_gnu_make=yes ;; # (
567 *) ovs_cv_gnu_make=no ;;
568 esac])
569 AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
570
643c0c34
BP		 571dnl OVS_CHECK_SPARSE_TARGET
572dnl
573dnl The "cgcc" script from "sparse" isn't very good at detecting the
574dnl target for which the code is being built. This helps it out.
575AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
576 [AC_CACHE_CHECK(
577 [target hint for cgcc],
578 [ac_cv_sparse_target],
579 [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
580 [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
581 [x86_64-*], [ac_cv_sparse_target=x86_64],
582 [ac_cv_sparse_target=other])])
583 AS_CASE([$ac_cv_sparse_target],
584 [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
585 [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
586 [SPARSEFLAGS= CGCCFLAGS=])
587 AC_SUBST([SPARSEFLAGS])
588 AC_SUBST([CGCCFLAGS])])
589
32e96ab7
AZ		 590dnl OVS_SPARSE_EXTRA_INCLUDES
591dnl
592dnl The cgcc script from "sparse" does not search gcc's default
593dnl search path. Get the default search path from GCC and pass
594dnl them to sparse.
595AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
596 AC_SUBST([SPARSE_EXTRA_INCLUDES],
597 [`$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 ' ' `] ))
598
29d935d6
BP		 599dnl OVS_ENABLE_SPARSE
600AC_DEFUN([OVS_ENABLE_SPARSE],
643c0c34 601 [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
372d58a4 602 AC_REQUIRE([OVS_CHECK_MAKE_IF])
32e96ab7 603 AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
372d58a4
BP		 604 : ${SPARSE=sparse}
605 AC_SUBST([SPARSE])
606 AC_CONFIG_COMMANDS_PRE(
607 [if test $ovs_cv_gnu_make_if = yes; then
38b7a52b 608 CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
372d58a4 609 fi])])
8a8cd0ac
BP		 610
611dnl OVS_PTHREAD_SET_NAME
612dnl
613dnl This checks for three known variants of pthreads functions for setting
614dnl the name of the current thread:
615dnl
616dnl glibc: int pthread_setname_np(pthread_t, const char *name);
617dnl NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
618dnl FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
619dnl
620dnl For glibc and FreeBSD, the arguments are just a thread and its name. For
621dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
622dnl provide to it.
623dnl
624dnl This macro defines:
625dnl
626dnl glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
627dnl NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
628dnl FreeBSD: HAVE_PTHREAD_SET_NAME_NP
629AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
630 [AC_CHECK_FUNCS([pthread_set_name_np])
631 if test $ac_cv_func_pthread_set_name_np != yes; then
632 AC_CACHE_CHECK(
633 [for pthread_setname_np() variant],
634 [ovs_cv_pthread_setname_np],
635 [AC_LINK_IFELSE(
a0903134 636 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac 637 ], [pthread_setname_np(pthread_self(), "name");])],
a0903134 638 [ovs_cv_pthread_setname_np=glibc],
8a8cd0ac 639 [AC_LINK_IFELSE(
a0903134 640 [AC_LANG_PROGRAM([#include <pthread.h>
8a8cd0ac
BP		 641], [pthread_setname_np(pthread_self(), "%s", "name");])],
642 [ovs_cv_pthread_setname_np=netbsd],
a0903134 643 [ovs_cv_pthread_setname_np=none])])])
8a8cd0ac
BP		 644 case $ovs_cv_pthread_setname_np in # (
645 glibc)
a0903134
YT		 646 AC_DEFINE(
647 [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
648 [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
649 ;; # (
8a8cd0ac 650 netbsd)
a0903134
YT		 651 AC_DEFINE(
652 [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
653 [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
654 ;;
8a8cd0ac
BP		 655 esac
656 fi])
5020f5f0
BP		 657
658dnl OVS_CHECK_LINUX_HOST.
659dnl
660dnl Checks whether we're building for a Linux host, based on the presence of
661dnl the __linux__ preprocessor symbol, and sets up an Automake conditional
662dnl LINUX based on the result.
663AC_DEFUN([OVS_CHECK_LINUX_HOST],
664 [AC_CACHE_CHECK(
665 [whether __linux__ is defined],
666 [ovs_cv_linux],
667 [AC_COMPILE_IFELSE(
668 [AC_LANG_PROGRAM([enum { LINUX = __linux__};], [])],
669 [ovs_cv_linux=true],
670 [ovs_cv_linux=false])])
671 AM_CONDITIONAL([LINUX], [$ovs_cv_linux])])
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