1# ===========================================================================
2#       https://www.gnu.org/software/autoconf-archive/ax_pkg_swig.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_PKG_SWIG([major.minor.micro], [action-if-found], [action-if-not-found])
8#
9# DESCRIPTION
10#
11#   This macro searches for a SWIG installation on your system. If found,
12#   then SWIG is AC_SUBST'd; if not found, then $SWIG is empty.  If SWIG is
13#   found, then SWIG_LIB is set to the SWIG library path, and AC_SUBST'd.
14#
15#   You can use the optional first argument to check if the version of the
16#   available SWIG is greater than or equal to the value of the argument. It
17#   should have the format: N[.N[.N]] (N is a number between 0 and 999. Only
18#   the first N is mandatory.) If the version argument is given (e.g.
19#   1.3.17), AX_PKG_SWIG checks that the swig package is this version number
20#   or higher.
21#
22#   As usual, action-if-found is executed if SWIG is found, otherwise
23#   action-if-not-found is executed.
24#
25#   In configure.in, use as:
26#
27#     AX_PKG_SWIG(1.3.17, [], [ AC_MSG_ERROR([SWIG is required to build..]) ])
28#     AX_SWIG_ENABLE_CXX
29#     AX_SWIG_MULTI_MODULE_SUPPORT
30#     AX_SWIG_PYTHON
31#
32# LICENSE
33#
34#   Copyright (c) 2008 Sebastian Huber <sebastian-huber@web.de>
35#   Copyright (c) 2008 Alan W. Irwin
36#   Copyright (c) 2008 Rafael Laboissiere <rafael@laboissiere.net>
37#   Copyright (c) 2008 Andrew Collier
38#   Copyright (c) 2011 Murray Cumming <murrayc@openismus.com>
39#   Copyright (c) 2018 Reini Urban <rurban@cpan.org>
40#   Copyright (c) 2021 Vincent Danjean <Vincent.Danjean@ens-lyon.org>
41#
42#   This program is free software; you can redistribute it and/or modify it
43#   under the terms of the GNU General Public License as published by the
44#   Free Software Foundation; either version 2 of the License, or (at your
45#   option) any later version.
46#
47#   This program is distributed in the hope that it will be useful, but
48#   WITHOUT ANY WARRANTY; without even the implied warranty of
49#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
50#   Public License for more details.
51#
52#   You should have received a copy of the GNU General Public License along
53#   with this program. If not, see <https://www.gnu.org/licenses/>.
54#
55#   As a special exception, the respective Autoconf Macro's copyright owner
56#   gives unlimited permission to copy, distribute and modify the configure
57#   scripts that are the output of Autoconf when processing the Macro. You
58#   need not follow the terms of the GNU General Public License when using
59#   or distributing such scripts, even though portions of the text of the
60#   Macro appear in them. The GNU General Public License (GPL) does govern
61#   all other use of the material that constitutes the Autoconf Macro.
62#
63#   This special exception to the GPL applies to versions of the Autoconf
64#   Macro released by the Autoconf Archive. When you make and distribute a
65#   modified version of the Autoconf Macro, you may extend this special
66#   exception to the GPL to apply to your modified version as well.
67
68#serial 15
69
70AC_DEFUN([AX_PKG_SWIG],[
71        # Find path to the "swig" executable.
72        AC_PATH_PROGS([SWIG],[swig swig3.0 swig2.0])
73        if test -z "$SWIG" ; then
74                m4_ifval([$3],[$3],[:])
75        elif test -z "$1" ; then
76                m4_ifval([$2],[$2],[:])
77	else
78                AC_MSG_CHECKING([SWIG version])
79                [swig_version=`$SWIG -version 2>&1 | grep 'SWIG Version' | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`]
80                AC_MSG_RESULT([$swig_version])
81                if test -n "$swig_version" ; then
82                        # Calculate the required version number components
83                        [required=$1]
84                        [required_major=`echo $required | sed 's/[^0-9].*//'`]
85                        if test -z "$required_major" ; then
86                                [required_major=0]
87                        fi
88                        [required=`echo $required. | sed 's/[0-9]*[^0-9]//'`]
89                        [required_minor=`echo $required | sed 's/[^0-9].*//'`]
90                        if test -z "$required_minor" ; then
91                                [required_minor=0]
92                        fi
93                        [required=`echo $required. | sed 's/[0-9]*[^0-9]//'`]
94                        [required_patch=`echo $required | sed 's/[^0-9].*//'`]
95                        if test -z "$required_patch" ; then
96                                [required_patch=0]
97                        fi
98                        # Calculate the available version number components
99                        [available=$swig_version]
100                        [available_major=`echo $available | sed 's/[^0-9].*//'`]
101                        if test -z "$available_major" ; then
102                                [available_major=0]
103                        fi
104                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
105                        [available_minor=`echo $available | sed 's/[^0-9].*//'`]
106                        if test -z "$available_minor" ; then
107                                [available_minor=0]
108                        fi
109                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
110                        [available_patch=`echo $available | sed 's/[^0-9].*//'`]
111                        if test -z "$available_patch" ; then
112                                [available_patch=0]
113                        fi
114                        # Convert the version tuple into a single number for easier comparison.
115                        # Using base 100 should be safe since SWIG internally uses BCD values
116                        # to encode its version number.
117                        required_swig_vernum=`expr $required_major \* 10000 \
118                            \+ $required_minor \* 100 \+ $required_patch`
119                        available_swig_vernum=`expr $available_major \* 10000 \
120                            \+ $available_minor \* 100 \+ $available_patch`
121
122                        if test $available_swig_vernum -lt $required_swig_vernum; then
123                                AC_MSG_WARN([SWIG version >= $1 is required.  You have $swig_version.])
124                                SWIG=''
125                                m4_ifval([$3],[$3],[])
126                        else
127                                AC_MSG_CHECKING([for SWIG library])
128                                SWIG_LIB=`$SWIG -swiglib | tr '\r\n' '  '`
129                                AC_MSG_RESULT([$SWIG_LIB])
130                                m4_ifval([$2],[$2],[])
131                        fi
132                else
133                        AC_MSG_WARN([cannot determine SWIG version])
134                        SWIG=''
135                        m4_ifval([$3],[$3],[])
136                fi
137        fi
138        AC_SUBST([SWIG_LIB])
139])
140