1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
dnl @synopsis AX_LIB_EVENT([MINIMUM-VERSION])
dnl
dnl Test for the libevent library of a particular version (or newer).
dnl
dnl If no path to the installed libevent is given, the macro will first try
dnl using no -I or -L flags, then searches under /usr, /usr/local, /opt,
dnl and /opt/libevent.
dnl If these all fail, it will try the $LIBEVENT_ROOT environment variable.
dnl
dnl This macro requires that #include <sys/types.h> works and defines u_char.
dnl
dnl This macro calls:
dnl AC_SUBST(LIBEVENT_CPPFLAGS)
dnl AC_SUBST(LIBEVENT_LDFLAGS)
dnl AC_SUBST(LIBEVENT_LIBS)
dnl
dnl And (if libevent is found):
dnl AC_DEFINE(HAVE_LIBEVENT)
dnl
dnl It also leaves the shell variables "success" and "ax_have_libevent"
dnl set to "yes" or "no".
dnl
dnl NOTE: This macro does not currently work for cross-compiling,
dnl but it can be easily modified to allow it. (grep "cross").
dnl
dnl @category InstalledPackages
dnl @category C
dnl @version 2007-09-12
dnl @license AllPermissive
dnl
dnl Copyright (C) 2009 David Reiss
dnl Copying and distribution of this file, with or without modification,
dnl are permitted in any medium without royalty provided the copyright
dnl notice and this notice are preserved.
dnl Input: ax_libevent_path, WANT_LIBEVENT_VERSION
dnl Output: success=yes/no
AC_DEFUN([AX_LIB_EVENT_DO_CHECK],
[
# Save our flags.
CPPFLAGS_SAVED="$CPPFLAGS"
LDFLAGS_SAVED="$LDFLAGS"
LIBS_SAVED="$LIBS"
LD_LIBRARY_PATH_SAVED="$LD_LIBRARY_PATH"
# Set our flags if we are checking a specific directory.
if test -n "$ax_libevent_path" ; then
LIBEVENT_CPPFLAGS="-I$ax_libevent_path/include"
LIBEVENT_LDFLAGS="-L$ax_libevent_path/lib"
LD_LIBRARY_PATH="$ax_libevent_path/lib:$LD_LIBRARY_PATH"
else
LIBEVENT_CPPFLAGS=""
LIBEVENT_LDFLAGS=""
fi
# Required flag for libevent.
LIBEVENT_LIBS="-levent"
# Prepare the environment for compilation.
CPPFLAGS="$CPPFLAGS $LIBEVENT_CPPFLAGS"
LDFLAGS="$LDFLAGS $LIBEVENT_LDFLAGS"
LIBS="$LIBS $LIBEVENT_LIBS"
export CPPFLAGS
export LDFLAGS
export LIBS
export LD_LIBRARY_PATH
success=no
# Compile, link, and run the program. This checks:
# - event.h is available for including.
# - event_get_version() is available for linking.
# - The event version string is lexicographically greater
# than the required version.
AC_LANG_PUSH([C])
dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling,
dnl but then the version cannot be checked.
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <event.h>
]], [[
const char* lib_version = event_get_version();
const char* wnt_version = "$WANT_LIBEVENT_VERSION";
int lib_digits;
int wnt_digits;
for (;;) {
/* If we reached the end of the want version. We have it. */
if (*wnt_version == '\0' || *wnt_version == '-') {
return 0;
}
/* If the want version continues but the lib version does not, */
/* we are missing a letter. We don't have it. */
if (*lib_version == '\0' || *lib_version == '-') {
return 1;
}
/* In the 1.4 version numbering style, if there are more digits */
/* in one version than the other, that one is higher. */
for (lib_digits = 0;
lib_version[lib_digits] >= '0' &&
lib_version[lib_digits] <= '9';
lib_digits++)
;
for (wnt_digits = 0;
wnt_version[wnt_digits] >= '0' &&
wnt_version[wnt_digits] <= '9';
wnt_digits++)
;
if (lib_digits > wnt_digits) {
return 0;
}
if (lib_digits < wnt_digits) {
return 1;
}
/* If we have greater than what we want. We have it. */
if (*lib_version > *wnt_version) {
return 0;
}
/* If we have less, we don't. */
if (*lib_version < *wnt_version) {
return 1;
}
lib_version++;
wnt_version++;
}
return 0;
]])], [
success=yes
])
AC_LANG_POP([C])
# Restore flags.
CPPFLAGS="$CPPFLAGS_SAVED"
LDFLAGS="$LDFLAGS_SAVED"
LIBS="$LIBS_SAVED"
LD_LIBRARY_PATH="$LD_LIBRARY_PATH_SAVED"
])
AC_DEFUN([AX_LIB_EVENT],
[
dnl Allow search path to be overridden on the command line.
AC_ARG_WITH([libevent],
AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent [default=yes]. Optionally specify the root prefix dir where libevent is installed]),
[
if test "x$withval" = "xno"; then
want_libevent="no"
elif test "x$withval" = "xyes"; then
want_libevent="yes"
ax_libevent_path=""
else
want_libevent="yes"
ax_libevent_path="$withval"
fi
],
[ want_libevent="yes" ; ax_libevent_path="" ])
if test "$want_libevent" = "yes"; then
WANT_LIBEVENT_VERSION=ifelse([$1], ,1.2,$1)
AC_MSG_CHECKING(for libevent >= $WANT_LIBEVENT_VERSION)
# Run tests.
if test -n "$ax_libevent_path"; then
AX_LIB_EVENT_DO_CHECK
else
for ax_libevent_path in "" $lt_sysroot/usr $lt_sysroot/usr/local $lt_sysroot/opt $lt_sysroot/opt/local $lt_sysroot/opt/libevent "$LIBEVENT_ROOT" ; do
AX_LIB_EVENT_DO_CHECK
if test "$success" = "yes"; then
break;
fi
done
fi
if test "$success" != "yes" ; then
AC_MSG_RESULT(no)
LIBEVENT_CPPFLAGS=""
LIBEVENT_LDFLAGS=""
LIBEVENT_LIBS=""
else
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_LIBEVENT,,[define if libevent is available])
ax_have_libevent_[]m4_translit([$1], [.], [_])="yes"
fi
ax_have_libevent="$success"
AC_SUBST(LIBEVENT_CPPFLAGS)
AC_SUBST(LIBEVENT_LDFLAGS)
AC_SUBST(LIBEVENT_LIBS)
fi
])
|
