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064af421 BP |
1 | # -*- autoconf -*- |
2 | ||
3 | # Copyright (c) 2008, 2009 Nicira Networks. | |
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 | |
064af421 BP |
17 | dnl OVS_CHECK_LINUX(OPTION, VERSION, VARIABLE, CONDITIONAL) |
18 | dnl | |
19 | dnl Configure linux kernel source tree | |
20 | AC_DEFUN([OVS_CHECK_LINUX], [ | |
21 | AC_ARG_WITH([$1], | |
22 | [AC_HELP_STRING([--with-$1=/path/to/linux-$2], | |
23 | [Specify the linux $2 kernel sources])], | |
24 | [path="$withval"], [path=])dnl | |
25 | if test -n "$path"; then | |
26 | path=`eval echo "$path"` | |
27 | ||
28 | AC_MSG_CHECKING([for $path directory]) | |
29 | if test -d "$path"; then | |
30 | AC_MSG_RESULT([yes]) | |
31 | $3=$path | |
32 | AC_SUBST($3) | |
33 | else | |
34 | AC_MSG_RESULT([no]) | |
35 | AC_ERROR([source dir $path doesn't exist]) | |
36 | fi | |
37 | ||
38 | AC_MSG_CHECKING([for $path kernel version]) | |
39 | patchlevel=`sed -n 's/^PATCHLEVEL = //p' "$path/Makefile"` | |
40 | sublevel=`sed -n 's/^SUBLEVEL = //p' "$path/Makefile"` | |
41 | AC_MSG_RESULT([2.$patchlevel.$sublevel]) | |
42 | if test "2.$patchlevel" != '$2'; then | |
43 | AC_ERROR([Linux kernel source in $path is not version $2]) | |
44 | fi | |
45 | if ! test -e "$path"/include/linux/version.h || \ | |
46 | ! test -e "$path"/include/linux/autoconf.h; then | |
47 | AC_MSG_ERROR([Linux kernel source in $path is not configured]) | |
48 | fi | |
49 | m4_if($2, [2.6], [OVS_CHECK_LINUX26_COMPAT]) | |
50 | fi | |
51 | AM_CONDITIONAL($4, test -n "$path") | |
52 | ]) | |
53 | ||
54 | dnl OVS_GREP_IFELSE(FILE, REGEX, IF-MATCH, IF-NO-MATCH) | |
55 | dnl | |
56 | dnl Greps FILE for REGEX. If it matches, runs IF-MATCH, otherwise IF-NO-MATCH. | |
57 | AC_DEFUN([OVS_GREP_IFELSE], [ | |
58 | AC_MSG_CHECKING([whether $2 matches in $1]) | |
59 | grep '$2' $1 >/dev/null 2>&1 | |
60 | status=$? | |
61 | case $status in | |
62 | 0) | |
63 | AC_MSG_RESULT([yes]) | |
64 | $3 | |
65 | ;; | |
66 | 1) | |
67 | AC_MSG_RESULT([no]) | |
68 | $4 | |
69 | ;; | |
70 | *) | |
71 | AC_MSG_ERROR([grep exited with status $status]) | |
72 | ;; | |
73 | esac | |
74 | ]) | |
75 | ||
76 | dnl OVS_DEFINE(NAME) | |
77 | dnl | |
78 | dnl Defines NAME to 1 in kcompat.h. | |
79 | AC_DEFUN([OVS_DEFINE], [ | |
80 | echo '#define $1 1' >> datapath/linux-2.6/kcompat.h.new | |
81 | ]) | |
82 | ||
83 | AC_DEFUN([OVS_CHECK_VETH], [ | |
84 | AC_MSG_CHECKING([whether to build veth module]) | |
85 | if test "$sublevel" = 18; then | |
86 | AC_MSG_RESULT([yes]) | |
87 | AC_SUBST([BUILD_VETH], 1) | |
88 | else | |
89 | AC_MSG_RESULT([no]) | |
90 | fi | |
91 | ]) | |
92 | ||
93 | AC_DEFUN([OVS_CHECK_LOG2_H], [ | |
94 | AC_MSG_CHECKING([for $KSRC26/include/linux/log2.h]) | |
95 | if test -e $KSRC26/include/linux/log2.h; then | |
96 | AC_MSG_RESULT([yes]) | |
97 | OVS_DEFINE([HAVE_LOG2_H]) | |
98 | else | |
99 | AC_MSG_RESULT([no]) | |
100 | fi | |
101 | ]) | |
102 | ||
103 | dnl OVS_CHECK_LINUX26_COMPAT | |
104 | dnl | |
105 | dnl Runs various Autoconf checks on the Linux 2.6 kernel source in | |
106 | dnl the directory in $KSRC26. | |
107 | AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [ | |
108 | rm -f datapath/linux-2.6/kcompat.h.new | |
109 | mkdir -p datapath/linux-2.6 | |
110 | : > datapath/linux-2.6/kcompat.h.new | |
111 | OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_transport_header], | |
112 | [OVS_DEFINE([HAVE_SKBUFF_HEADER_HELPERS])]) | |
113 | OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [raw], | |
114 | [OVS_DEFINE([HAVE_MAC_RAW])]) | |
115 | OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], | |
116 | [skb_copy_from_linear_data_offset], | |
117 | [OVS_DEFINE([HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET])]) | |
118 | OVS_GREP_IFELSE([$KSRC26/include/net/netlink.h], [NLA_NUL_STRING], | |
119 | [OVS_DEFINE([HAVE_NLA_NUL_STRING])]) | |
120 | OVS_GREP_IFELSE([$KSRC26/include/linux/err.h], [ERR_CAST], | |
121 | [OVS_DEFINE([HAVE_ERR_CAST])]) | |
aed94495 BP |
122 | OVS_GREP_IFELSE([$KSRC26/include/net/checksum.h], [csum_unfold], |
123 | [OVS_DEFINE([HAVE_CSUM_UNFOLD])]) | |
124 | OVS_GREP_IFELSE([$KSRC26/include/linux/skbuff.h], [skb_cow], | |
125 | [OVS_DEFINE([HAVE_SKB_COW])]) | |
064af421 BP |
126 | OVS_CHECK_LOG2_H |
127 | OVS_CHECK_VETH | |
128 | if cmp -s datapath/linux-2.6/kcompat.h.new \ | |
129 | datapath/linux-2.6/kcompat.h >/dev/null 2>&1; then | |
130 | rm datapath/linux-2.6/kcompat.h.new | |
131 | else | |
132 | mv datapath/linux-2.6/kcompat.h.new datapath/linux-2.6/kcompat.h | |
133 | fi | |
134 | ]) | |
135 | ||
136 | dnl Checks for net/if_packet.h. | |
137 | AC_DEFUN([OVS_CHECK_IF_PACKET], | |
138 | [AC_CHECK_HEADER([net/if_packet.h], | |
139 | [HAVE_IF_PACKET=yes], | |
140 | [HAVE_IF_PACKET=no]) | |
141 | AM_CONDITIONAL([HAVE_IF_PACKET], [test "$HAVE_IF_PACKET" = yes]) | |
142 | if test "$HAVE_IF_PACKET" = yes; then | |
143 | AC_DEFINE([HAVE_IF_PACKET], [1], | |
144 | [Define to 1 if net/if_packet.h is available.]) | |
145 | fi]) | |
146 | ||
e50097d2 BP |
147 | dnl Checks for buggy strtok_r. |
148 | dnl | |
149 | dnl Some versions of glibc 2.7 has a bug in strtok_r when compiling | |
150 | dnl with optimization that can cause segfaults: | |
151 | dnl | |
152 | dnl http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614. | |
153 | AC_DEFUN([OVS_CHECK_STRTOK_R], | |
154 | [AC_CACHE_CHECK( | |
155 | [whether strtok_r macro segfaults on some inputs], | |
156 | [ovs_cv_strtok_r_bug], | |
157 | [AC_RUN_IFELSE( | |
158 | [AC_LANG_PROGRAM([#include <stdio.h> | |
159 | #include <string.h> | |
160 | ], | |
161 | [[char string[] = ":::"; | |
162 | char *save_ptr = (char *) 0xc0ffee; | |
163 | char *token1, *token2; | |
164 | token1 = strtok_r(string, ":", &save_ptr); | |
165 | token2 = strtok_r(NULL, ":", &save_ptr); | |
166 | printf ("%s %s\n", token1, token2); | |
167 | return 0; | |
168 | ]])], | |
169 | [ovs_cv_strtok_r_bug=no], | |
170 | [ovs_cv_strtok_r_bug=yes], | |
171 | [ovs_cv_strtok_r_bug=yes])]) | |
172 | if test $ovs_cv_strtok_r_bug = yes; then | |
173 | AC_DEFINE([HAVE_STRTOK_R_BUG], [1], | |
174 | [Define if strtok_r macro segfaults on some inputs]) | |
175 | fi | |
176 | ]) | |
177 | ||
064af421 BP |
178 | dnl ---------------------------------------------------------------------- |
179 | dnl These macros are from GNU PSPP, with the following original license: | |
180 | dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc. | |
181 | dnl This file is free software; the Free Software Foundation | |
182 | dnl gives unlimited permission to copy and/or distribute it, | |
183 | dnl with or without modifications, as long as this notice is preserved. | |
184 | ||
185 | dnl OVS_CHECK_CC_OPTION([OPTION], [ACTION-IF-ACCEPTED], [ACTION-IF-REJECTED]) | |
186 | dnl Check whether the given C compiler OPTION is accepted. | |
187 | dnl If so, execute ACTION-IF-ACCEPTED, otherwise ACTION-IF-REJECTED. | |
188 | AC_DEFUN([OVS_CHECK_CC_OPTION], | |
189 | [ | |
190 | m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-], [_])])dnl | |
191 | AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name], | |
192 | [ovs_save_CFLAGS="$CFLAGS" | |
193 | CFLAGS="$CFLAGS $1" | |
194 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,)], [ovs_cv_name[]=yes], [ovs_cv_name[]=no]) | |
195 | CFLAGS="$ovs_save_CFLAGS"]) | |
196 | if test $ovs_cv_name = yes; then | |
197 | m4_if([$2], [], [;], [$2]) | |
198 | else | |
199 | m4_if([$3], [], [:], [$3]) | |
200 | fi | |
201 | ]) | |
202 | ||
203 | dnl OVS_ENABLE_OPTION([OPTION]) | |
204 | dnl Check whether the given C compiler OPTION is accepted. | |
205 | dnl If so, add it to CFLAGS. | |
206 | dnl Example: OVS_ENABLE_OPTION([-Wdeclaration-after-statement]) | |
207 | AC_DEFUN([OVS_ENABLE_OPTION], | |
208 | [OVS_CHECK_CC_OPTION([$1], [CFLAGS="$CFLAGS $1"])]) | |
209 | dnl ---------------------------------------------------------------------- |