configure: Run sparse automatically if C=1 specified on "make" command.
[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_LINUX26
29 dnl
30 dnl Configure linux kernel source tree 
31 AC_DEFUN([OVS_CHECK_LINUX26], [
32   AC_ARG_WITH([l26],
33               [AC_HELP_STRING([--with-l26=/path/to/linux-2.6],
34                               [Specify the linux 2.6 kernel build directory])],
35               [KBUILD26="$withval"], [KBUILD26=])dnl
36   AC_ARG_WITH([l26-source],
37               [AC_HELP_STRING([--with-l26-source=/path/to/linux-2.6-source],
38                               [Specify the linux 2.6 kernel source directory
39                                (usually figured out automatically from build
40                                directory)])],
41               [KSRC26="$withval"], [KSRC26=])dnl
42   if test -n "$KBUILD26"; then
43     KBUILD26=`eval echo "$KBUILD26"`
44     case $KBUILD26 in
45         /*) ;;
46         *) KBUILD26=`pwd`/$KBUILD26 ;;
47     esac
48
49     # The build directory is what the user provided.
50     # Make sure that it exists.
51     AC_MSG_CHECKING([for Linux 2.6 build directory])
52     if test -d "$KBUILD26"; then
53         AC_MSG_RESULT([$KBUILD26])
54         AC_SUBST(KBUILD26)
55     else
56         AC_MSG_RESULT([no])
57         AC_ERROR([source dir $KBUILD26 doesn't exist])
58     fi
59
60     # Debian breaks kernel headers into "source" header and "build" headers.
61     # We want the source headers, but $KBUILD26 gives us the "build" headers.
62     # Use heuristics to find the source headers.
63     AC_MSG_CHECKING([for Linux 2.6 source directory])
64     if test -n "$KSRC26"; then
65       KSRC26=`eval echo "$KSRC26"`
66       case $KSRC26 in
67           /*) ;;
68           *) KSRC26=`pwd`/$KSRC26 ;;
69       esac
70       if test ! -e $KSRC26/include/linux/kernel.h; then
71         AC_MSG_ERROR([$KSRC26 is not a kernel source directory)])
72       fi
73     else
74       KSRC26=$KBUILD26
75       if test ! -e $KSRC26/include/linux/kernel.h; then
76         case `echo "$KBUILD26" | sed 's,/*$,,'` in # (
77           */build)
78             KSRC26=`echo "$KBUILD26" | sed 's,/build/*$,/source,'`
79             ;; # (
80           *)
81             KSRC26=`(cd $KBUILD26 && pwd -P) | sed 's,-[[^-]]*$,-common,'`
82             ;;
83         esac
84       fi
85       if test ! -e $KSRC26/include/linux/kernel.h; then
86         AC_MSG_ERROR([cannot find source directory (please use --with-l26-source)])
87       fi
88     fi
89     AC_MSG_RESULT([$KSRC26])
90
91     AC_MSG_CHECKING([for kernel version])
92     patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$KSRC26/Makefile"`
93     sublevel=`sed -n 's/^SUBLEVEL = //p' "$KSRC26/Makefile"`
94     if test -z "$patchlevel" || test -z "$sublevel"; then
95        AC_ERROR([cannot determine kernel version])
96     fi
97     AC_MSG_RESULT([2.$patchlevel.$sublevel])
98     if test "2.$patchlevel" != '2.6'; then
99        if test "$BUILD26" = "$KSRC26"; then
100          AC_ERROR([Linux kernel in $KBUILD26 is not version 2.6])
101        else
102          AC_ERROR([Linux kernel in build tree $KBUILD26 (source tree $KSRC26) is not version 2.6])
103        fi
104     fi
105     if test ! -e "$KBUILD26"/include/linux/version.h || \
106        (test ! -e "$KBUILD26"/include/linux/autoconf.h && \
107         test ! -e "$KBUILD26"/include/generated/autoconf.h); then
108         AC_MSG_ERROR([Linux kernel source in $KBUILD26 is not configured])
109     fi
110     OVS_CHECK_LINUX26_COMPAT
111   elif test -n "$KSRC26"; then
112     AC_MSG_ERROR([--with-l26-source may not be specified without --with-l26])
113   fi
114   AM_CONDITIONAL(L26_ENABLED, test -n "$KBUILD26")
115 ])
116
117 dnl OVS_GREP_IFELSE(FILE, REGEX, [IF-MATCH], [IF-NO-MATCH])
118 dnl
119 dnl Greps FILE for REGEX.  If it matches, runs IF-MATCH, otherwise IF-NO-MATCH.
120 dnl If IF-MATCH is empty then it defines to OVS_DEFINE(HAVE_<REGEX>), with
121 dnl <REGEX> translated to uppercase.
122 AC_DEFUN([OVS_GREP_IFELSE], [
123   AC_MSG_CHECKING([whether $2 matches in $1])
124   if test -f $1; then
125     grep '$2' $1 >/dev/null 2>&1
126     status=$?
127     case $status in
128       0) 
129         AC_MSG_RESULT([yes])
130         m4_if([$3], [], [OVS_DEFINE([HAVE_]m4_toupper([$2]))], [$3])
131         ;;
132       1) 
133         AC_MSG_RESULT([no])
134         $4
135         ;;
136       *) 
137         AC_MSG_ERROR([grep exited with status $status])
138         ;;
139     esac
140   else
141     AC_MSG_RESULT([file not found])
142     $4
143   fi
144 ])
145
146 dnl OVS_DEFINE(NAME)
147 dnl
148 dnl Defines NAME to 1 in kcompat.h.
149 AC_DEFUN([OVS_DEFINE], [
150   echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new
151 ])
152
153 AC_DEFUN([OVS_CHECK_LOG2_H], [
154   AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h])
155   if test -e $KSRC26/include/linux/log2.h; then
156     AC_MSG_RESULT([yes])
157     OVS_DEFINE([HAVE_LOG2_H])
158   else
159     AC_MSG_RESULT([no])
160   fi
161 ])
162
163 dnl OVS_CHECK_LINUX26_COMPAT
164 dnl
165 dnl Runs various Autoconf checks on the Linux 2.6 kernel source in
166 dnl the directory in $KBUILD26.
167 AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
168   rm -f datapath/linux-2.6/kcompat.h.new
169   mkdir -p datapath/linux-2.6
170   : > datapath/linux-2.6/kcompat.h.new
171
172   OVS_GREP_IFELSE([$KSRC26/arch/x86/include/asm/checksum_32.h], [src_err,],
173                   [OVS_DEFINE([HAVE_CSUM_COPY_DBG])])
174
175   OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST])
176
177   OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast])
178
179   OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_disable_lro])
180   OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_get_stats])
181   OVS_GREP_IFELSE([$KSRC26/include/linux/netdevice.h], [dev_get_by_index_rcu])
182
183   OVS_GREP_IFELSE([$KSRC26/include/linux/rcupdate.h], [rcu_read_lock_held], [],
184                   [OVS_GREP_IFELSE([$KSRC26/include/linux/rtnetlink.h],
185                                    [rcu_read_lock_held])])
186   
187   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
188   # is necessary because some versions of this header remove the
189   # member but retain the kerneldoc comment that describes it (which
190   # starts with @).  The brackets must be doubled because of m4
191   # quoting rules.
192   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [[[^@]]proto_data_valid],
193                   [OVS_DEFINE([HAVE_PROTO_DATA_VALID])])
194   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw],
195                   [OVS_DEFINE([HAVE_MAC_RAW])])
196   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_dst(],
197                   [OVS_DEFINE([HAVE_SKB_DST_ACCESSOR_FUNCS])])
198   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], 
199                   [skb_copy_from_linear_data_offset])
200   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow_head])
201   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header],
202                   [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])])
203   OVS_GREP_IFELSE([$KSRC26/include/linux/icmpv6.h], [icmp6_hdr],
204                   [OVS_DEFINE([HAVE_ICMP6_HDR])])
205   OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_warn_if_lro],
206                   [OVS_DEFINE([HAVE_SKB_WARN_LRO])])
207
208   OVS_GREP_IFELSE([$KSRC26/include/linux/string.h], [kmemdup], [],
209                   [OVS_GREP_IFELSE([$KSRC26/include/linux/slab.h], [kmemdup])])
210
211   OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [bool],
212                   [OVS_DEFINE([HAVE_BOOL_TYPE])])
213   OVS_GREP_IFELSE([$KSRC26/include/linux/types.h], [__wsum],
214                   [OVS_DEFINE([HAVE_CSUM_TYPES])])
215
216   OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_replace4])
217   OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold])
218
219   OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING])
220   OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_get_be16])
221   OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [nla_find_nested])
222
223   OVS_GREP_IFELSE([$KSRC26/include/linux/if_link.h], [rtnl_link_stats64])
224
225   OVS_GREP_IFELSE([$KSRC26/include/linux/if_vlan.h], [ADD_ALL_VLANS_CMD],
226                   [OVS_DEFINE([HAVE_VLAN_BUG_WORKAROUND])])
227
228   OVS_CHECK_LOG2_H
229
230   if cmp -s datapath/linux-2.6/kcompat.h.new \
231             datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then
232     rm datapath/linux-2.6/kcompat.h.new
233   else
234     mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h
235   fi
236 ])
237
238 dnl Checks for net/if_packet.h.
239 AC_DEFUN([OVS_CHECK_IF_PACKET],
240   [AC_CHECK_HEADER([net/if_packet.h],
241                    [HAVE_IF_PACKET=yes],
242                    [HAVE_IF_PACKET=no])
243    AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes])
244    if test "$HAVE_IF_PACKET" = yes; then
245       AC_DEFINE([HAVE_IF_PACKET], [1],
246                 [Define to 1 if net/if_packet.h is available.])
247    fi])
248
249 dnl Checks for buggy strtok_r.
250 dnl
251 dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling
252 dnl with optimization that can cause segfaults:
253 dnl
254 dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
255 AC_DEFUN([OVS_CHECK_STRTOK_R],
256   [AC_CACHE_CHECK(
257      [whether strtok_r macro segfaults on some inputs],
258      [ovs_cv_strtok_r_bug],
259      [AC_RUN_IFELSE(
260         [AC_LANG_PROGRAM([#include <stdio.h>
261                           #include <string.h>
262                          ],
263                          [[char string[] = ":::";
264                            char *save_ptr = (char *) 0xc0ffee;
265                            char *token1, *token2;
266                            token1 = strtok_r(string, ":", &save_ptr);
267                            token2 = strtok_r(NULL, ":", &save_ptr);
268                            freopen ("/dev/null", "w", stdout);
269                            printf ("%s %s\n", token1, token2);
270                            return 0;
271                           ]])],
272         [ovs_cv_strtok_r_bug=no],
273         [ovs_cv_strtok_r_bug=yes],
274         [ovs_cv_strtok_r_bug=yes])])
275    if test $ovs_cv_strtok_r_bug = yes; then
276      AC_DEFINE([HAVE_STRTOK_R_BUG], [1],
277                [Define if strtok_r macro segfaults on some inputs])
278    fi
279 ])
280
281 dnl ----------------------------------------------------------------------
282 dnl These macros are from GNU PSPP, with the following original license:
283 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
284 dnl This file is free software; the Free Software Foundation
285 dnl gives unlimited permission to copy and/or distribute it,
286 dnl with or without modifications, as long as this notice is preserved.
287
288 dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED])
289 dnl Check whether the given C compiler OPTION is accepted.
290 dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED.
291 AC_DEFUN([OVS_CHECK_CC_OPTION],
292 [
293   m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl
294   AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], 
295     [ovs_save_CFLAGS="$CFLAGS"
296      CFLAGS="$CFLAGS $1"
297      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no])
298      CFLAGS="$ovs_save_CFLAGS"])
299   if test $ovs_cv_name = yes; then
300     m4_if([$2], [], [:], [$2])
301   else
302     m4_if([$3], [], [:], [$3])
303   fi
304 ])
305
306 dnl OVS_ENABLE_OPTION([OPTION])
307 dnl Check whether the given C compiler OPTION is accepted.
308 dnl If so, add it to WARNING_FLAGS.
309 dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement])
310 AC_DEFUN([OVS_ENABLE_OPTION], 
311   [OVS_CHECK_CC_OPTION([$1], [WARNING_FLAGS="$WARNING_FLAGS $1"])
312    AC_SUBST([WARNING_FLAGS])])
313
314 dnl OVS_CONDITIONAL_CC_OPTION([OPTION], [CONDITIONAL])
315 dnl Check whether the given C compiler OPTION is accepted.
316 dnl If so, enable the given Automake CONDITIONAL.
317
318 dnl Example: OVS_CONDITIONAL_CC_OPTION([-Wno-unused], [HAVE_WNO_UNUSED])
319 AC_DEFUN([OVS_CONDITIONAL_CC_OPTION],
320   [OVS_CHECK_CC_OPTION(
321     [$1], [ovs_have_cc_option=yes], [ovs_have_cc_option=no])
322    AM_CONDITIONAL([$2], [test $ovs_have_cc_option = yes])])
323 dnl ----------------------------------------------------------------------
324
325 dnl Check for too-old XenServer.
326 AC_DEFUN([OVS_CHECK_XENSERVER_VERSION],
327   [AC_CACHE_CHECK([XenServer release], [ovs_cv_xsversion],
328     [if test -e /etc/redhat-release; then
329        ovs_cv_xsversion=`sed -n 's/^XenServer DDK release \([[^-]]*\)-.*/\1/p' /etc/redhat-release`
330      fi
331      if test -z "$ovs_cv_xsversion"; then
332        ovs_cv_xsversion=none
333      fi])
334   case $ovs_cv_xsversion in
335     none)
336       ;;
337
338     [[1-9]][[0-9]]* |                    dnl XenServer 10 or later
339     [[6-9]]* |                           dnl XenServer 6 or later
340     5.[[7-9]]* |                         dnl XenServer 5.7 or later
341     5.6.[[1-9]][[0-9]][[0-9]][[0-9]]* |  dnl XenServer 5.6.1000 or later
342     5.6.[[2-9]][[0-9]][[0-9]]* |         dnl XenServer 5.6.200 or later
343     5.6.1[[0-9]][[0-9]])                 dnl Xenserver 5.6.100 or later
344       ;;
345
346     *)
347       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.)])
348       ;;
349   esac])
350
351 dnl OVS_MAKE_HAS_IF([if-true], [if-false])
352 dnl
353 dnl Checks whether make has the GNU make $(if condition,then,else) extension.
354 dnl Runs 'if-true' if so, 'if-false' otherwise.
355 AC_DEFUN([OVS_MAKE_HAS_IF],
356   [AC_CACHE_CHECK(
357      [whether ${MAKE-make} has GNU make \$(if) extension],
358      [ovs_cv_gnu_make_if],
359      [cat <<'EOF' > conftest.mk
360 conftest.out:
361         echo $(if x,y,z) > conftest.out
362 .PHONY: all
363 EOF
364       rm -f conftest.out
365       AS_ECHO(["$as_me:$LINENO: invoking ${MAKE-make} -f conftest.mk all:"]) >&AS_MESSAGE_LOG_FD 2>&1
366       ${MAKE-make} -f conftest.mk conftest.out >&AS_MESSAGE_LOG_FD 2>&1
367       AS_ECHO(["$as_me:$LINENO: conftest.out contains:"]) >&AS_MESSAGE_LOG_FD 2>&1
368       cat conftest.out >&AS_MESSAGE_LOG_FD 2>&1
369       result=`cat conftest.out`
370       rm -f conftest.mk conftest.out
371       if test "X$result" = "Xy"; then
372         ovs_cv_gnu_make_if=yes
373       else
374         ovs_cv_gnu_make_if=no
375       fi])
376    AS_IF([test $ovs_cv_gnu_make_if = yes], [$1], [$2])])
377
378 dnl OVS_ENABLE_SPARSE
379 AC_DEFUN([OVS_ENABLE_SPARSE],
380   [OVS_MAKE_HAS_IF(
381      [AC_CONFIG_COMMANDS_PRE(
382         [: ${SPARSE=sparse}
383          AC_SUBST([SPARSE])
384          CC='$(if $(C),REAL_CC="'"$CC"'" CHECK="$(SPARSE) -I $(top_srcdir)/include/sparse" cgcc,'"$CC"')'])])])