packet: Make set_ethertype() static
[sliver-openvswitch.git] / acinclude.m4
1 # -*- autoconf -*-
2
3 # Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
4 #
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:
8 #
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.
16
17 dnl OVS_ENABLE_WERROR
18 AC_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
28 dnl OVS_CHECK_LINUX
29 dnl
30 dnl Configure linux kernel source tree 
31 AC_DEFUN([OVS_CHECK_LINUX], [
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
38                                (usually figured out automatically from build
39                                directory)])])
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=$with_l26_source
59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
60     else
61       KSRC=
62     fi
63   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
64     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
65   fi
66
67   if test -n "$KBUILD"; then
68     KBUILD=`eval echo "$KBUILD"`
69     case $KBUILD in
70         /*) ;;
71         *) KBUILD=`pwd`/$KBUILD ;;
72     esac
73
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])
79         AC_SUBST(KBUILD)
80     else
81         AC_MSG_RESULT([no])
82         AC_ERROR([source dir $KBUILD doesn't exist])
83     fi
84
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"`
91       case $KSRC in
92           /*) ;;
93           *) KSRC=`pwd`/$KSRC ;;
94       esac
95       if test ! -e $KSRC/include/linux/kernel.h; then
96         AC_MSG_ERROR([$KSRC is not a kernel source directory])
97       fi
98     else
99       KSRC=$KBUILD
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 # (
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
116       fi
117       if test ! -e "$KSRC"/include/linux/kernel.h; then
118         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
119       fi
120     fi
121     AC_MSG_RESULT([$KSRC])
122
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
131     else
132        kversion=$version.$patchlevel.$sublevel
133     fi
134     AC_MSG_RESULT([$kversion])
135
136     if test "$version" -ge 3; then
137        if test "$version" = 3 && test "$patchlevel" -le 11; then
138           : # Linux 3.x
139        else
140          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version newer than 3.11.x is not supported])
141        fi
142     else
143        if test "$version" -le 1 || test "$patchlevel" -le 5 || test "$sublevel" -le 31; then
144          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6.32 or later is required])
145        else
146          : # Linux 2.6.x
147        fi
148     fi
149     if (test ! -e "$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 $KBUILD is not configured])
154     fi
155     OVS_CHECK_LINUX_COMPAT
156   fi
157   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
158 ])
159
160 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
161 dnl
162 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
163 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
164 dnl <REGEX> translated to uppercase.
165 AC_DEFUN([OVS_GREP_IFELSE], [
166   AC_MSG_CHECKING([whether $2 matches in $1])
167   if test -f $1; then
168     grep '$2' $1 >/dev/null 2>&1
169     status=$?
170     case $status in
171       0) 
172         AC_MSG_RESULT([yes])
173         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
174         ;;
175       1) 
176         AC_MSG_RESULT([no])
177         $4
178         ;;
179       *) 
180         AC_MSG_ERROR([grep exited with status $status])
181         ;;
182     esac
183   else
184     AC_MSG_RESULT([file not found])
185     $4
186   fi
187 ])
188
189 dnl OVS_DEFINE(NAME)
190 dnl
191 dnl Defines NAME to 1 in kcompat.h.
192 AC_DEFUN([OVS_DEFINE], [
193   echo '#define $1 1' >> datapath/linux/kcompat.h.new
194 ])
195
196 AC_DEFUN([OVS_CHECK_LOG2_H], [
197   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
198   if test -e $KSRC/include/linux/log2.h; then
199     AC_MSG_RESULT([yes])
200     OVS_DEFINE([HAVE_LOG2_H])
201   else
202     AC_MSG_RESULT([no])
203   fi
204 ])
205
206 dnl OVS_CHECK_LINUX_COMPAT
207 dnl
208 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
209 dnl the directory in $KBUILD.
210 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
211   rm -f datapath/linux/kcompat.h.new
212   mkdir -p datapath/linux
213   : > datapath/linux/kcompat.h.new
214
215   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
216                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
217
218   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
219
220   OVS_GREP_IFELSE([$KSRC/include/linux/etherdevice.h], [eth_hw_addr_random])
221
222   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [vlan_set_encap_proto])
223
224   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
225
226   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
227   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
228   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
229   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [__skb_gso_segment])
230   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [can_checksum_protocol])
231   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [netdev_features_t])
232
233   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
234                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
235                                    [rcu_read_lock_held])])
236   OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h], [lockdep_rtnl_is_held])
237   
238   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
239   # is necessary because some versions of this header remove the
240   # member but retain the kerneldoc comment that describes it (which
241   # starts with @).  The brackets must be doubled because of m4
242   # quoting rules.
243   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
244                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
245   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [rxhash])
246   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
247                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
248   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], 
249                   [skb_copy_from_linear_data_offset])
250   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h],
251                   [skb_reset_tail_pointer])
252   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
253   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
254                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
255   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
256                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
257   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
258                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
259   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
260   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_frag_page])
261   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_has_frag_list])
262   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [__skb_fill_page_desc])
263   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_reset_mac_len])
264   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_unclone])
265
266   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
267                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
268   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
269                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
270   OVS_GREP_IFELSE([$KSRC/include/uapi/linux/types.h], [__wsum],
271                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
272
273   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
274   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
275
276   OVS_GREP_IFELSE([$KSRC/include/net/genetlink.h], [parallel_ops])
277   OVS_GREP_IFELSE([$KSRC/include/net/gre.h], [gre_cisco_register])
278   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
279   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be16])
280   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be32])
281   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_put_be64])
282   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
283
284   OVS_GREP_IFELSE([$KSRC/include/net/sctp/checksum.h], [sctp_compute_cksum])
285
286   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
287                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
288
289   OVS_GREP_IFELSE([$KSRC/include/linux/percpu.h], [this_cpu_ptr])
290
291   OVS_GREP_IFELSE([$KSRC/include/linux/openvswitch.h], [openvswitch_handle_frame_hook],
292                   [OVS_DEFINE([HAVE_RHEL_OVS_HOOK])])
293
294   OVS_CHECK_LOG2_H
295
296   if cmp -s datapath/linux/kcompat.h.new \
297             datapath/linux/kcompat.h >/dev/null 2>&1; then
298     rm datapath/linux/kcompat.h.new
299   else
300     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
301   fi
302 ])
303
304 dnl Checks for net/if_packet.h.
305 AC_DEFUN([OVS_CHECK_IF_PACKET],
306   [AC_CHECK_HEADER([net/if_packet.h],
307                    [HAVE_IF_PACKET=yes],
308                    [HAVE_IF_PACKET=no])
309    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
310    if test "$HAVE_IF_PACKET" = yes; then
311       AC_DEFINE([HAVE_IF_PACKET], [1],
312                 [Define to 1 if net/if_packet.h is available.])
313    fi])
314
315 dnl Checks for net/if_dl.h.
316 dnl
317 dnl (We use this as a proxy for checking whether we're building on FreeBSD
318 dnl or NetBSD.)
319 AC_DEFUN([OVS_CHECK_IF_DL],
320   [AC_CHECK_HEADER([net/if_dl.h],
321                    [HAVE_IF_DL=yes],
322                    [HAVE_IF_DL=no])
323    AM_CONDITIONAL([HAVE_IF_DL], [test "$HAVE_IF_DL" = yes])
324    if test "$HAVE_IF_DL" = yes; then
325       AC_DEFINE([HAVE_IF_DL], [1],
326                 [Define to 1 if net/if_dl.h is available.])
327
328       # On these platforms we use libpcap to access network devices.
329       AC_SEARCH_LIBS([pcap_open_live], [pcap])
330    fi])
331
332 dnl Checks for buggy strtok_r.
333 dnl
334 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
335 dnl with optimization that can cause segfaults:
336 dnl
337 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
338 AC_DEFUN([OVS_CHECK_STRTOK_R],
339   [AC_CACHE_CHECK(
340      [whether strtok_r macro segfaults on some inputs],
341      [ovs_cv_strtok_r_bug],
342      [AC_RUN_IFELSE(
343         [AC_LANG_PROGRAM([#include <stdio.h>
344                           #include <string.h>
345                          ],
346                          [[char string[] = ":::";
347                            char *save_ptr = (char *) 0xc0ffee;
348                            char *token1, *token2;
349                            token1 = strtok_r(string, ":", &save_ptr);
350                            token2 = strtok_r(NULL, ":", &save_ptr);
351                            freopen ("/dev/null", "w", stdout);
352                            printf ("%s %s\n", token1, token2);
353                            return 0;
354                           ]])],
355         [ovs_cv_strtok_r_bug=no],
356         [ovs_cv_strtok_r_bug=yes],
357         [ovs_cv_strtok_r_bug=yes])])
358    if test $ovs_cv_strtok_r_bug = yes; then
359      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
360                [Define if strtok_r macro segfaults on some inputs])
361    fi
362 ])
363
364 dnl ----------------------------------------------------------------------
365 dnl These macros are from GNU PSPP, with the following original license:
366 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
367 dnl This file is free software; the Free Software Foundation
368 dnl gives unlimited permission to copy and/or distribute it,
369 dnl with or without modifications, as long as this notice is preserved.
370
371 AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
372   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
373   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
374     [ovs_save_CFLAGS="$CFLAGS"
375      dnl Include -Werror in the compiler options, because without -Werror
376      dnl clang's GCC-compatible compiler driver does not return a failure
377      dnl exit status even though it complains about options it does not
378      dnl understand.
379      CFLAGS="$CFLAGS $WERROR $1"
380      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
381      CFLAGS="$ovs_save_CFLAGS"])
382   if test $ovs_cv_name = yes; then
383     m4_if([$2], [], [:], [$2])
384   else
385     m4_if([$3], [], [:], [$3])
386   fi
387 ])
388
389 dnl OVS_CHECK_WERROR
390 dnl
391 dnl Check whether the C compiler accepts -Werror.
392 dnl Sets $WERROR to "-Werror", if so, and otherwise to the empty string.
393 AC_DEFUN([OVS_CHECK_WERROR],
394   [WERROR=
395    _OVS_CHECK_CC_OPTION([-Werror], [WERROR=-Werror])])
396
397 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
398 dnl Check whether the given C compiler OPTION is accepted.
399 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
400 AC_DEFUN([OVS_CHECK_CC_OPTION],
401   [AC_REQUIRE([OVS_CHECK_WERROR])
402    _OVS_CHECK_CC_OPTION([$1], [$2], [$3])])
403
404 dnl OVS_ENABLE_OPTION([OPTION])
405 dnl Check whether the given C compiler OPTION is accepted.
406 dnl If so, add it to WARNING_FLAGS.
407 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
408 AC_DEFUN([OVS_ENABLE_OPTION], 
409   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
410    AC_SUBST([WARNING_FLAGS])])
411
412 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
413 dnl Check whether the given C compiler OPTION is accepted.
414 dnl If so, enable the given Automake CONDITIONAL.
415
416 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
417 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
418   [OVS_CHECK_CC_OPTION(
419     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
420    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
421 dnl ----------------------------------------------------------------------
422
423 dnl Check for too-old XenServer.
424 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
425   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
426     [if test -e /etc/redhat-release; then
427        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
428      fi
429      if test -z "$ovs_cv_xsversion"; then
430        ovs_cv_xsversion=none
431      fi])
432   case $ovs_cv_xsversion in
433     none)
434       ;;
435
436     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
437     [[6-9]]* |                           dnl XenServer 6 or later
438     5.[[7-9]]* |                         dnl XenServer 5.7 or later
439     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
440     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
441     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
442       ;;
443
444     *)
445       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.)])
446       ;;
447   esac])
448
449 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
450 dnl
451 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
452 dnl Runs 'if-true' if so, 'if-false' otherwise.
453 AC_DEFUN([OVS_CHECK_MAKE_IF],
454   [AC_CACHE_CHECK(
455      [whether ${MAKE-make} has GNU make \$(if) extension],
456      [ovs_cv_gnu_make_if],
457      [cat <<'EOF' > conftest.mk
458 conftest.out:
459         echo $(if x,y,z) > conftest.out
460 .PHONY: all
461 EOF
462       rm -f conftest.out
463       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
464       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
465       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
466       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
467       result=`cat conftest.out`
468       rm -f conftest.mk conftest.out
469       if test "X$result" = "Xy"; then
470         ovs_cv_gnu_make_if=yes
471       else
472         ovs_cv_gnu_make_if=no
473       fi])])
474
475 dnl OVS_CHECK_GNU_MAKE
476 dnl
477 dnl Checks whether make is GNU make (because Linux kernel Makefiles
478 dnl only work with GNU make).
479 AC_DEFUN([OVS_CHECK_GNU_MAKE],
480   [AC_CACHE_CHECK(
481      [whether ${MAKE-make} is GNU make],
482      [ovs_cv_gnu_make],
483      [rm -f conftest.out
484       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} --version:"]) >&AS_MESSAGE_LOG_FD 2>&1
485       ${MAKE-make} --version >conftest.out 2>&1
486       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
487       result=`cat conftest.out`
488       rm -f conftest.mk conftest.out
489
490       case $result in # (
491         GNU*) ovs_cv_gnu_make=yes ;; # (
492         *) ovs_cv_gnu_make=no ;;
493       esac])
494    AM_CONDITIONAL([GNU_MAKE], [test $ovs_cv_gnu_make = yes])])
495
496 dnl OVS_CHECK_SPARSE_TARGET
497 dnl
498 dnl The "cgcc" script from "sparse" isn't very good at detecting the
499 dnl target for which the code is being built.  This helps it out.
500 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
501   [AC_CACHE_CHECK(
502     [target hint for cgcc],
503     [ac_cv_sparse_target],
504     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
505        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
506        [x86_64-*], [ac_cv_sparse_target=x86_64],
507        [ac_cv_sparse_target=other])])
508    AS_CASE([$ac_cv_sparse_target],
509      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
510      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
511      [SPARSEFLAGS= CGCCFLAGS=])
512    AC_SUBST([SPARSEFLAGS])
513    AC_SUBST([CGCCFLAGS])])
514
515 dnl OVS_SPARSE_EXTRA_INCLUDES
516 dnl
517 dnl The cgcc script from "sparse" does not search gcc's default
518 dnl search path. Get the default search path from GCC and pass
519 dnl them to sparse.
520 AC_DEFUN([OVS_SPARSE_EXTRA_INCLUDES],
521     AC_SUBST([SPARSE_EXTRA_INCLUDES],
522            [`$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 ' ' `] ))
523
524 dnl OVS_ENABLE_SPARSE
525 AC_DEFUN([OVS_ENABLE_SPARSE],
526   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
527    AC_REQUIRE([OVS_CHECK_MAKE_IF])
528    AC_REQUIRE([OVS_SPARSE_EXTRA_INCLUDES])
529    : ${SPARSE=sparse}
530    AC_SUBST([SPARSE])
531    AC_CONFIG_COMMANDS_PRE(
532      [if test $ovs_cv_gnu_make_if = yes; then
533         CC='$(if $(C),env REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS) $(SPARSE_EXTRA_INCLUDES) " cgcc $(CGCCFLAGS),'"$CC"')'
534       fi])])
535
536 dnl OVS_PTHREAD_SET_NAME
537 dnl
538 dnl This checks for three known variants of pthreads functions for setting
539 dnl the name of the current thread:
540 dnl
541 dnl   glibc: int pthread_setname_np(pthread_t, const char *name);
542 dnl   NetBSD: int pthread_setname_np(pthread_t, const char *format, void *arg);
543 dnl   FreeBSD: int pthread_set_name_np(pthread_t, const char *name);
544 dnl
545 dnl For glibc and FreeBSD, the arguments are just a thread and its name.  For
546 dnl NetBSD, 'format' is a printf() format string and 'arg' is an argument to
547 dnl provide to it.
548 dnl
549 dnl This macro defines:
550 dnl
551 dnl    glibc: HAVE_GLIBC_PTHREAD_SETNAME_NP
552 dnl    NetBSD: HAVE_NETBSD_PTHREAD_SETNAME_NP
553 dnl    FreeBSD: HAVE_PTHREAD_SET_NAME_NP
554 AC_DEFUN([OVS_CHECK_PTHREAD_SET_NAME],
555   [AC_CHECK_FUNCS([pthread_set_name_np])
556    if test $ac_cv_func_pthread_set_name_np != yes; then
557      AC_CACHE_CHECK(
558        [for pthread_setname_np() variant],
559        [ovs_cv_pthread_setname_np],
560        [AC_LINK_IFELSE(
561          [AC_LANG_PROGRAM([#include <pthread.h>
562   ], [pthread_setname_np(pthread_self(), "name");])],
563          [ovs_cv_pthread_setname_np=glibc],
564          [AC_LINK_IFELSE(
565            [AC_LANG_PROGRAM([#include <pthread.h>
566 ], [pthread_setname_np(pthread_self(), "%s", "name");])],
567            [ovs_cv_pthread_setname_np=netbsd],
568            [ovs_cv_pthread_setname_np=none])])])
569      case $ovs_cv_pthread_setname_np in # (
570        glibc)
571           AC_DEFINE(
572             [HAVE_GLIBC_PTHREAD_SETNAME_NP], [1],
573             [Define to 1 if pthread_setname_np() is available and takes 2 parameters (like glibc).])
574           ;; # (
575        netbsd)
576           AC_DEFINE(
577             [HAVE_NETBSD_PTHREAD_SETNAME_NP], [1],
578             [Define to 1 if pthread_setname_np() is available and takes 3 parameters (like NetBSD).])
579           ;;
580      esac
581    fi])