1 # Copyright (c) 2013 Holger Weiss <holger@weiss.in-berlin.de>
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are met:
7 # 1. Redistributions of source code must retain the above copyright notice, this
8 # list of conditions and the following disclaimer.
10 # 2. Redistributions in binary form must reproduce the above copyright notice,
11 # this list of conditions and the following disclaimer in the documentation
12 # and/or other materials provided with the distribution.
14 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
21 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 # Check the availability of libev 4.00 or newer. If it's not found, or if the
28 # user specified "--with-ev=embedded", we use our internal copy of libev and set
29 # $nsca_lib_ev_embedded to "yes". Otherwise, we set $nsca_lib_ev_embedded to
30 # "no". Either way, we set the output variables EVCPPFLAGS, EVLDFLAGS, and
31 # EVLIBS to appropriate values. (Why are there no underscores in these variable
32 # names? Because Automake treats names like "foo_CPPFLAGS" specially.)
33 AC_DEFUN([NSCA_LIB_EV],
35 nsca_save_CPPFLAGS=$CPPFLAGS
36 nsca_save_LDFLAGS=$LDFLAGS
37 nsca_lib_ev_embedded=maybe
39 [AS_HELP_STRING([--with-ev=PATH],
40 [use the libev library in PATH])],
41 [nsca_ev_dir=$with_ev],
43 AC_MSG_CHECKING([whether libev is desired])
44 AS_CASE([$nsca_ev_dir],
47 AC_MSG_ERROR([building without libev is not supported])],
49 [AS_IF([test "x$nsca_ev_dir" = xexternal], [nsca_lib_ev_embedded=no])
51 AC_MSG_CHECKING([for the location of libev])
53 for _nsca_ev_dir in /usr /usr/local /usr/pkg
54 do dnl Solaris 10 doesn't have "test -e".
55 AS_IF([test -r "$_nsca_ev_dir/include/ev.h"],
56 [nsca_ev_dir=$_nsca_ev_dir
59 AS_IF([test "x$nsca_ev_dir" != xunknown],
60 [AC_MSG_RESULT([$nsca_ev_dir])],
61 [AC_MSG_RESULT([not found, continuing anyway])])],
63 [AC_MSG_RESULT([yes, the bundled copy])
65 nsca_lib_ev_embedded=yes],
67 nsca_lib_ev_embedded=no])
68 AS_IF([test "x$nsca_ev_dir" != xembedded &&
69 test "x$nsca_ev_dir" != xunknown &&
70 test "x$nsca_ev_dir" != x/usr],
71 [EVCPPFLAGS="-I$nsca_ev_dir/include"
72 EVLDFLAGS="-L$nsca_ev_dir/lib"
73 CPPFLAGS="$EVCPPFLAGS $CPPFLAGS"
74 LDFLAGS="$EVLDFLAGS $LDFLAGS"])
75 AS_IF([test "x$nsca_lib_ev_embedded" != xyes],
76 [AC_CHECK_HEADER([ev.h],
77 [AC_CHECK_LIB([ev], [ev_version_major],
79 AC_CHECK_LIB([ev], [ev_run], [:],
80 [_NSCA_LIB_EV_ERROR([libev too old], [$nsca_lib_ev_embedded])
81 nsca_lib_ev_embedded=yes])],
82 [_NSCA_LIB_EV_ERROR([cannot link with libev], [$nsca_lib_ev_embedded])
83 nsca_lib_ev_embedded=yes])],
84 [_NSCA_LIB_EV_ERROR([libev header not found], [$nsca_lib_ev_embedded])
85 nsca_lib_ev_embedded=yes])])
86 AS_IF([test "x$nsca_lib_ev_embedded" = xyes],
87 [unset EVCPPFLAGS EVLDFLAGS EVLIBS],
88 [nsca_lib_ev_embedded=no])
89 AC_SUBST([EVCPPFLAGS])
92 AC_DEFINE([EV_COMPAT3], [0],
93 [Define to 1 if libev 3.x compatibility is desired.])
94 CPPFLAGS=$nsca_save_CPPFLAGS
95 LDFLAGS=$nsca_save_LDFLAGS
98 # _NSCA_LIB_EV_EMBEDDED
99 # ---------------------
100 # Arrange for using the bundled copy of libev.
101 AC_DEFUN([_NSCA_LIB_EV_EMBEDDED],
103 dnl Why don't we use m4_include? The difference is that m4_include warns
104 dnl against multiple inclusions, while the builtin does not. Multiple
105 dnl inclusions yield unexpected results if the included file calls m4_define
106 dnl without quoting the first argument. However, lib/ev/libev.m4 doesn't do
107 dnl that, so it should be safe to include it more than once.
108 m4_builtin([include], [lib/ev/libev.m4])
109 AC_DEFINE([EV_MULTIPLICITY], [0],
110 [Define to 1 if the bundled libev should support multiple event loops.])
111 AC_DEFINE([EV_MINPRI], [-1],
112 [Define to the smallest allowed priority in the bundled libev.])
113 AC_DEFINE([EV_MAXPRI], [1],
114 [Define to the largest allowed priority in the bundled libev.])
115 AC_DEFINE([EV_VERIFY], [0],
116 [Define to the desired internal verification level of the bundled libev.])
117 AC_DEFINE([ECB_AVOID_PTHREADS], [1], dnl Otherwise, building on AIX will fail.
118 [Define to 1 if memory fences aren't needed for the bundled libev.])
119 ])# _NSCA_LIB_EV_EMBEDDED
121 # _NSCA_LIB_EV_ERROR(MESSAGE, USE_EMBEDDED_EV)
122 # --------------------------------------------
123 # If USE_EMBEDDED_EV is set to "no", bail out with the specified error MESSAGE.
124 # Otherwise, spit out the specified MESSAGE and a note that we're going to use
125 # the included copy of libev, and then call _NSCA_LIB_EV_EMBEDDED.
126 AC_DEFUN([_NSCA_LIB_EV_ERROR],
128 AS_IF([test "x$2" = xno],
129 [AC_MSG_ERROR([$1])],
130 [AC_MSG_NOTICE([$1, using bundled copy])
131 _NSCA_LIB_EV_EMBEDDED])
132 ])# _NSCA_LIB_EV_ERROR
134 dnl vim:set joinspaces textwidth=80: