configure: Change --with-l26 to --with-linux.
[openvswitch] / acinclude.m4
1 # -*- autoconf -*-
2
3 # Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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=$with_l26_source
59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
60     fi
61   elif test X"$with_linux_source" != X || test X"$with_l26_source" != X; then
62     AC_MSG_ERROR([Linux source directory may not be specified without Linux build directory])
63   fi
64
65   if test -n "$KBUILD"; then
66     KBUILD=`eval echo "$KBUILD"`
67     case $KBUILD in
68         /*) ;;
69         *) KBUILD=`pwd`/$KBUILD ;;
70     esac
71
72     # The build directory is what the user provided.
73     # Make sure that it exists.
74     AC_MSG_CHECKING([for Linux build directory])
75     if test -d "$KBUILD"; then
76         AC_MSG_RESULT([$KBUILD])
77         AC_SUBST(KBUILD)
78     else
79         AC_MSG_RESULT([no])
80         AC_ERROR([source dir $KBUILD doesn't exist])
81     fi
82
83     # Debian breaks kernel headers into "source" header and "build" headers.
84     # We want the source headers, but $KBUILD gives us the "build" headers.
85     # Use heuristics to find the source headers.
86     AC_MSG_CHECKING([for Linux source directory])
87     if test -n "$KSRC"; then
88       KSRC=`eval echo "$KSRC"`
89       case $KSRC in
90           /*) ;;
91           *) KSRC=`pwd`/$KSRC ;;
92       esac
93       if test ! -e $KSRC/include/linux/kernel.h; then
94         AC_MSG_ERROR([$KSRC is not a kernel source directory)])
95       fi
96     else
97       KSRC=$KBUILD
98       if test ! -e $KSRC/include/linux/kernel.h; then
99         case `echo "$KBUILD" | sed 's,/*$,,'` in # (
100           */build)
101             KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
102             ;; # (
103           *)
104             KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
105             ;;
106         esac
107       fi
108       if test ! -e $KSRC/include/linux/kernel.h; then
109         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
110       fi
111     fi
112     AC_MSG_RESULT([$KSRC])
113
114     AC_MSG_CHECKING([for kernel version])
115     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
116     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
117     if test -z "$patchlevel" || test -z "$sublevel"; then
118        AC_ERROR([cannot determine kernel version])
119     fi
120     AC_MSG_RESULT([2.$patchlevel.$sublevel])
121     if test "2.$patchlevel" != '2.6'; then
122        if test "$KBUILD" = "$KSRC"; then
123          AC_ERROR([Linux kernel in $KBUILD is not version 2.6])
124        else
125          AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is not version 2.6])
126        fi
127     fi
128     if test ! -e "$KBUILD"/include/linux/version.h || \
129        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
130         test ! -e "$KBUILD"/include/generated/autoconf.h); then
131         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
132     fi
133     OVS_CHECK_LINUX_COMPAT
134   fi
135   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
136 ])
137
138 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
139 dnl
140 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
141 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
142 dnl <REGEX> translated to uppercase.
143 AC_DEFUN([OVS_GREP_IFELSE], [
144   AC_MSG_CHECKING([whether $2 matches in $1])
145   if test -f $1; then
146     grep '$2' $1 >/dev/null 2>&1
147     status=$?
148     case $status in
149       0) 
150         AC_MSG_RESULT([yes])
151         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
152         ;;
153       1) 
154         AC_MSG_RESULT([no])
155         $4
156         ;;
157       *) 
158         AC_MSG_ERROR([grep exited with status $status])
159         ;;
160     esac
161   else
162     AC_MSG_RESULT([file not found])
163     $4
164   fi
165 ])
166
167 dnl OVS_DEFINE(NAME)
168 dnl
169 dnl Defines NAME to 1 in kcompat.h.
170 AC_DEFUN([OVS_DEFINE], [
171   echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
172 ])
173
174 AC_DEFUN([OVS_CHECK_LOG2_H], [
175   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
176   if test -e $KSRC/include/linux/log2.h; then
177     AC_MSG_RESULT([yes])
178     OVS_DEFINE([HAVE_LOG2_H])
179   else
180     AC_MSG_RESULT([no])
181   fi
182 ])
183
184 dnl OVS_CHECK_LINUX_COMPAT
185 dnl
186 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
187 dnl the directory in $KBUILD.
188 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
189   rm -f datapath/linux-2.6/kcompat.h.new
190   mkdir -p datapath/linux-2.6
191   : > datapath/linux-2.6/kcompat.h.new
192
193   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
194                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
195
196   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
197
198   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
199
200   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
201   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
202   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
203
204   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
205                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
206                                    [rcu_read_lock_held])])
207   
208   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
209   # is necessary because some versions of this header remove the
210   # member but retain the kerneldoc comment that describes it (which
211   # starts with @).  The brackets must be doubled because of m4
212   # quoting rules.
213   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
214                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
215   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
216                   [OVS_DEFINE([HAVE_MAC_RAW])])
217   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
218                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
219   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], 
220                   [skb_copy_from_linear_data_offset])
221   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
222   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
223                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
224   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
225                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
226   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
227                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
228   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
229
230   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
231                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
232
233   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
234                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
235   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
236                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
237
238   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
239   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
240
241   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
242   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
243   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
244
245   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
246
247   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
248                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
249
250   OVS_CHECK_LOG2_H
251
252   if cmp -s datapath/linux-2.6/kcompat.h.new \
253             datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
254     rm datapath/linux-2.6/kcompat.h.new
255   else
256     mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
257   fi
258 ])
259
260 dnl Checks for net/if_packet.h.
261 AC_DEFUN([OVS_CHECK_IF_PACKET],
262   [AC_CHECK_HEADER([net/if_packet.h],
263                    [HAVE_IF_PACKET=yes],
264                    [HAVE_IF_PACKET=no])
265    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
266    if test "$HAVE_IF_PACKET" = yes; then
267       AC_DEFINE([HAVE_IF_PACKET], [1],
268                 [Define to 1 if net/if_packet.h is available.])
269    fi])
270
271 dnl Checks for buggy strtok_r.
272 dnl
273 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
274 dnl with optimization that can cause segfaults:
275 dnl
276 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
277 AC_DEFUN([OVS_CHECK_STRTOK_R],
278   [AC_CACHE_CHECK(
279      [whether strtok_r macro segfaults on some inputs],
280      [ovs_cv_strtok_r_bug],
281      [AC_RUN_IFELSE(
282         [AC_LANG_PROGRAM([#include <stdio.h>
283                           #include <string.h>
284                          ],
285                          [[char string[] = ":::";
286                            char *save_ptr = (char *) 0xc0ffee;
287                            char *token1, *token2;
288                            token1 = strtok_r(string, ":", &save_ptr);
289                            token2 = strtok_r(NULL, ":", &save_ptr);
290                            freopen ("/dev/null", "w", stdout);
291                            printf ("%s %s\n", token1, token2);
292                            return 0;
293                           ]])],
294         [ovs_cv_strtok_r_bug=no],
295         [ovs_cv_strtok_r_bug=yes],
296         [ovs_cv_strtok_r_bug=yes])])
297    if test $ovs_cv_strtok_r_bug = yes; then
298      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
299                [Define if strtok_r macro segfaults on some inputs])
300    fi
301 ])
302
303 dnl ----------------------------------------------------------------------
304 dnl These macros are from GNU PSPP, with the following original license:
305 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
306 dnl This file is free software; the Free Software Foundation
307 dnl gives unlimited permission to copy and/or distribute it,
308 dnl with or without modifications, as long as this notice is preserved.
309
310 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
311 dnl Check whether the given C compiler OPTION is accepted.
312 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
313 AC_DEFUN([OVS_CHECK_CC_OPTION],
314 [
315   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
316   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
317     [ovs_save_CFLAGS="$CFLAGS"
318      CFLAGS="$CFLAGS $1"
319      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
320      CFLAGS="$ovs_save_CFLAGS"])
321   if test $ovs_cv_name = yes; then
322     m4_if([$2], [], [:], [$2])
323   else
324     m4_if([$3], [], [:], [$3])
325   fi
326 ])
327
328 dnl OVS_ENABLE_OPTION([OPTION])
329 dnl Check whether the given C compiler OPTION is accepted.
330 dnl If so, add it to WARNING_FLAGS.
331 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
332 AC_DEFUN([OVS_ENABLE_OPTION], 
333   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
334    AC_SUBST([WARNING_FLAGS])])
335
336 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
337 dnl Check whether the given C compiler OPTION is accepted.
338 dnl If so, enable the given Automake CONDITIONAL.
339
340 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
341 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
342   [OVS_CHECK_CC_OPTION(
343     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
344    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
345 dnl ----------------------------------------------------------------------
346
347 dnl Check for too-old XenServer.
348 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
349   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
350     [if test -e /etc/redhat-release; then
351        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
352      fi
353      if test -z "$ovs_cv_xsversion"; then
354        ovs_cv_xsversion=none
355      fi])
356   case $ovs_cv_xsversion in
357     none)
358       ;;
359
360     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
361     [[6-9]]* |                           dnl XenServer 6 or later
362     5.[[7-9]]* |                         dnl XenServer 5.7 or later
363     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
364     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
365     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
366       ;;
367
368     *)
369       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.)])
370       ;;
371   esac])
372
373 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
374 dnl
375 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
376 dnl Runs 'if-true' if so, 'if-false' otherwise.
377 AC_DEFUN([OVS_MAKE_HAS_IF],
378   [AC_CACHE_CHECK(
379      [whether ${MAKE-make} has GNU make \$(if) extension],
380      [ovs_cv_gnu_make_if],
381      [cat <<'EOF' > conftest.mk
382 conftest.out:
383         echo $(if x,y,z) > conftest.out
384 .PHONY: all
385 EOF
386       rm -f conftest.out
387       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
388       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
389       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
390       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
391       result=`cat conftest.out`
392       rm -f conftest.mk conftest.out
393       if test "X$result" = "Xy"; then
394         ovs_cv_gnu_make_if=yes
395       else
396         ovs_cv_gnu_make_if=no
397       fi])
398    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
399
400 dnl OVS_ENABLE_SPARSE
401 AC_DEFUN([OVS_ENABLE_SPARSE],
402   [OVS_MAKE_HAS_IF(
403      [AC_CONFIG_COMMANDS_PRE(
404         [: ${SPARSE=sparse}
405          AC_SUBST([SPARSE])
406          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse" cgcc,'"$CC"')'])])])