Debian: fail gracefully if modules can't be loaded on install
[sliver-openvswitch.git] / 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=$with_l26_source
59       AC_MSG_WARN([--with-l26-source is deprecated, please use --with-linux-source instead])
60     else
61       KSRC=
62     fi
63   elif test X"$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 $KSRC/include/linux/kernel.h; then
101         case `echo "$KBUILD" | sed 's,/*$,,'` in # (
102           */build)
103             KSRC=`echo "$KBUILD" | sed 's,/build/*$,/source,'`
104             ;; # (
105           *)
106             KSRC=`(cd $KBUILD && pwd -P) | sed 's,-[[^-]]*$,-common,'`
107             ;;
108         esac
109       fi
110       if test ! -e $KSRC/include/linux/kernel.h; then
111         AC_MSG_ERROR([cannot find source directory (please use --with-linux-source)])
112       fi
113     fi
114     AC_MSG_RESULT([$KSRC])
115
116     AC_MSG_CHECKING([for kernel version])
117     version=`sed -n 's/^VERSION = //p' "$KSRC/Makefile"`
118     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC/Makefile"`
119     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC/Makefile"`
120     if test X"$version" = X || test X"$patchlevel" = X; then
121        AC_ERROR([cannot determine kernel version])
122     elif test X"$sublevel" = X; then
123        kversion=$version.$patchlevel
124     else
125        kversion=$version.$patchlevel.$sublevel
126     fi
127     AC_MSG_RESULT([$kversion])
128
129     if test "$version" -ge 3; then
130        : # Linux 3.x
131     elif test "$version" = 2 && test "$patchlevel" -ge 6; then
132        : # Linux 2.6.x
133     else
134        if test "$KBUILD" = "$KSRC"; then
135          AC_ERROR([Linux kernel in $KBUILD is version $kversion, but version 2.6 or later is required])
136        else
137          AC_ERROR([Linux kernel in build tree $KBUILD (source tree $KSRC) is version $kversion, but version 2.6 or later is required])
138        fi
139     fi
140     if test ! -e "$KBUILD"/include/linux/version.h || \
141        (test ! -e "$KBUILD"/include/linux/autoconf.h && \
142         test ! -e "$KBUILD"/include/generated/autoconf.h); then
143         AC_MSG_ERROR([Linux kernel source in $KBUILD is not configured])
144     fi
145     OVS_CHECK_LINUX_COMPAT
146   fi
147   AM_CONDITIONAL(LINUX_ENABLED, test -n "$KBUILD")
148 ])
149
150 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
151 dnl
152 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
153 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
154 dnl <REGEX> translated to uppercase.
155 AC_DEFUN([OVS_GREP_IFELSE], [
156   AC_MSG_CHECKING([whether $2 matches in $1])
157   if test -f $1; then
158     grep '$2' $1 >/dev/null 2>&1
159     status=$?
160     case $status in
161       0) 
162         AC_MSG_RESULT([yes])
163         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
164         ;;
165       1) 
166         AC_MSG_RESULT([no])
167         $4
168         ;;
169       *) 
170         AC_MSG_ERROR([grep exited with status $status])
171         ;;
172     esac
173   else
174     AC_MSG_RESULT([file not found])
175     $4
176   fi
177 ])
178
179 dnl OVS_DEFINE(NAME)
180 dnl
181 dnl Defines NAME to 1 in kcompat.h.
182 AC_DEFUN([OVS_DEFINE], [
183   echo '#define $1 1' >> datapath/linux/kcompat.h.new
184 ])
185
186 AC_DEFUN([OVS_CHECK_LOG2_H], [
187   AC_MSG_CHECKING([for $KSRC/include/linux/log2.h])
188   if test -e $KSRC/include/linux/log2.h; then
189     AC_MSG_RESULT([yes])
190     OVS_DEFINE([HAVE_LOG2_H])
191   else
192     AC_MSG_RESULT([no])
193   fi
194 ])
195
196 dnl OVS_CHECK_LINUX_COMPAT
197 dnl
198 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
199 dnl the directory in $KBUILD.
200 AC_DEFUN([OVS_CHECK_LINUX_COMPAT], [
201   rm -f datapath/linux/kcompat.h.new
202   mkdir -p datapath/linux
203   : > datapath/linux/kcompat.h.new
204
205   OVS_GREP_IFELSE([$KSRC/arch/x86/include/asm/checksum_32.h], [src_err,],
206                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
207
208   OVS_GREP_IFELSE([$KSRC/include/linux/err.h], [ERR_CAST])
209
210   OVS_GREP_IFELSE([$KSRC/include/linux/in.h], [ipv4_is_multicast])
211
212   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_disable_lro])
213   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_stats])
214   OVS_GREP_IFELSE([$KSRC/include/linux/netdevice.h], [dev_get_by_index_rcu])
215
216   OVS_GREP_IFELSE([$KSRC/include/linux/rcupdate.h], [rcu_read_lock_held], [],
217                   [OVS_GREP_IFELSE([$KSRC/include/linux/rtnetlink.h],
218                                    [rcu_read_lock_held])])
219   
220   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
221   # is necessary because some versions of this header remove the
222   # member but retain the kerneldoc comment that describes it (which
223   # starts with @).  The brackets must be doubled because of m4
224   # quoting rules.
225   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [[[^@]]proto_data_valid],
226                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
227   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [raw],
228                   [OVS_DEFINE([HAVE_MAC_RAW])])
229   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_dst(],
230                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
231   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], 
232                   [skb_copy_from_linear_data_offset])
233   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_cow_head])
234   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_transport_header],
235                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
236   OVS_GREP_IFELSE([$KSRC/include/linux/icmpv6.h], [icmp6_hdr],
237                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
238   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [skb_warn_if_lro],
239                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
240   OVS_GREP_IFELSE([$KSRC/include/linux/skbuff.h], [consume_skb])
241
242   OVS_GREP_IFELSE([$KSRC/include/linux/string.h], [kmemdup], [],
243                   [OVS_GREP_IFELSE([$KSRC/include/linux/slab.h], [kmemdup])])
244
245   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [bool],
246                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
247   OVS_GREP_IFELSE([$KSRC/include/linux/types.h], [__wsum],
248                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
249
250   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_replace4])
251   OVS_GREP_IFELSE([$KSRC/include/net/checksum.h], [csum_unfold])
252
253   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [NLA_NUL_STRING])
254   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_get_be16])
255   OVS_GREP_IFELSE([$KSRC/include/net/netlink.h], [nla_find_nested])
256
257   OVS_GREP_IFELSE([$KSRC/include/linux/if_link.h], [rtnl_link_stats64])
258
259   OVS_GREP_IFELSE([$KSRC/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
260                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
261
262   OVS_CHECK_LOG2_H
263
264   if cmp -s datapath/linux/kcompat.h.new \
265             datapath/linux/kcompat.h >/dev/null 2>&1; then
266     rm datapath/linux/kcompat.h.new
267   else
268     mv datapath/linux/kcompat.h.new datapath/linux/kcompat.h
269   fi
270 ])
271
272 dnl Checks for net/if_packet.h.
273 AC_DEFUN([OVS_CHECK_IF_PACKET],
274   [AC_CHECK_HEADER([net/if_packet.h],
275                    [HAVE_IF_PACKET=yes],
276                    [HAVE_IF_PACKET=no])
277    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
278    if test "$HAVE_IF_PACKET" = yes; then
279       AC_DEFINE([HAVE_IF_PACKET], [1],
280                 [Define to 1 if net/if_packet.h is available.])
281    fi])
282
283 dnl Checks for buggy strtok_r.
284 dnl
285 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
286 dnl with optimization that can cause segfaults:
287 dnl
288 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
289 AC_DEFUN([OVS_CHECK_STRTOK_R],
290   [AC_CACHE_CHECK(
291      [whether strtok_r macro segfaults on some inputs],
292      [ovs_cv_strtok_r_bug],
293      [AC_RUN_IFELSE(
294         [AC_LANG_PROGRAM([#include <stdio.h>
295                           #include <string.h>
296                          ],
297                          [[char string[] = ":::";
298                            char *save_ptr = (char *) 0xc0ffee;
299                            char *token1, *token2;
300                            token1 = strtok_r(string, ":", &save_ptr);
301                            token2 = strtok_r(NULL, ":", &save_ptr);
302                            freopen ("/dev/null", "w", stdout);
303                            printf ("%s %s\n", token1, token2);
304                            return 0;
305                           ]])],
306         [ovs_cv_strtok_r_bug=no],
307         [ovs_cv_strtok_r_bug=yes],
308         [ovs_cv_strtok_r_bug=yes])])
309    if test $ovs_cv_strtok_r_bug = yes; then
310      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
311                [Define if strtok_r macro segfaults on some inputs])
312    fi
313 ])
314
315 dnl ----------------------------------------------------------------------
316 dnl These macros are from GNU PSPP, with the following original license:
317 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
318 dnl This file is free software; the Free Software Foundation
319 dnl gives unlimited permission to copy and/or distribute it,
320 dnl with or without modifications, as long as this notice is preserved.
321
322 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
323 dnl Check whether the given C compiler OPTION is accepted.
324 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
325 AC_DEFUN([OVS_CHECK_CC_OPTION],
326 [
327   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
328   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
329     [ovs_save_CFLAGS="$CFLAGS"
330      CFLAGS="$CFLAGS $1"
331      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
332      CFLAGS="$ovs_save_CFLAGS"])
333   if test $ovs_cv_name = yes; then
334     m4_if([$2], [], [:], [$2])
335   else
336     m4_if([$3], [], [:], [$3])
337   fi
338 ])
339
340 dnl OVS_ENABLE_OPTION([OPTION])
341 dnl Check whether the given C compiler OPTION is accepted.
342 dnl If so, add it to WARNING_FLAGS.
343 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
344 AC_DEFUN([OVS_ENABLE_OPTION], 
345   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
346    AC_SUBST([WARNING_FLAGS])])
347
348 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
349 dnl Check whether the given C compiler OPTION is accepted.
350 dnl If so, enable the given Automake CONDITIONAL.
351
352 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
353 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
354   [OVS_CHECK_CC_OPTION(
355     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
356    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
357 dnl ----------------------------------------------------------------------
358
359 dnl Check for too-old XenServer.
360 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
361   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
362     [if test -e /etc/redhat-release; then
363        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
364      fi
365      if test -z "$ovs_cv_xsversion"; then
366        ovs_cv_xsversion=none
367      fi])
368   case $ovs_cv_xsversion in
369     none)
370       ;;
371
372     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
373     [[6-9]]* |                           dnl XenServer 6 or later
374     5.[[7-9]]* |                         dnl XenServer 5.7 or later
375     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
376     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
377     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
378       ;;
379
380     *)
381       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.)])
382       ;;
383   esac])
384
385 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
386 dnl
387 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
388 dnl Runs 'if-true' if so, 'if-false' otherwise.
389 AC_DEFUN([OVS_MAKE_HAS_IF],
390   [AC_CACHE_CHECK(
391      [whether ${MAKE-make} has GNU make \$(if) extension],
392      [ovs_cv_gnu_make_if],
393      [cat <<'EOF' > conftest.mk
394 conftest.out:
395         echo $(if x,y,z) > conftest.out
396 .PHONY: all
397 EOF
398       rm -f conftest.out
399       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
400       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
401       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
402       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
403       result=`cat conftest.out`
404       rm -f conftest.mk conftest.out
405       if test "X$result" = "Xy"; then
406         ovs_cv_gnu_make_if=yes
407       else
408         ovs_cv_gnu_make_if=no
409       fi])
410    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
411
412 dnl OVS_CHECK_SPARSE_TARGET
413 dnl
414 dnl The "cgcc" script from "sparse" isn't very good at detecting the
415 dnl target for which the code is being built.  This helps it out.
416 AC_DEFUN([OVS_CHECK_SPARSE_TARGET],
417   [AC_CACHE_CHECK(
418     [target hint for cgcc],
419     [ac_cv_sparse_target],
420     [AS_CASE([`$CC -dumpmachine 2>/dev/null`],
421        [i?86-* | athlon-*], [ac_cv_sparse_target=x86],
422        [x86_64-*], [ac_cv_sparse_target=x86_64],
423        [ac_cv_sparse_target=other])])
424    AS_CASE([$ac_cv_sparse_target],
425      [x86], [SPARSEFLAGS= CGCCFLAGS=-target=i86],
426      [x86_64], [SPARSEFLAGS=-m64 CGCCFLAGS=-target=x86_64],
427      [SPARSEFLAGS= CGCCFLAGS=])
428    AC_SUBST([SPARSEFLAGS])
429    AC_SUBST([CGCCFLAGS])])
430
431 dnl OVS_ENABLE_SPARSE
432 AC_DEFUN([OVS_ENABLE_SPARSE],
433   [AC_REQUIRE([OVS_CHECK_SPARSE_TARGET])
434    OVS_MAKE_HAS_IF(
435      [AC_CONFIG_COMMANDS_PRE(
436         [: ${SPARSE=sparse}
437          AC_SUBST([SPARSE])
438          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse $(SPARSEFLAGS)" cgcc $(CGCCFLAGS),'"$CC"')'])])])