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1# ===========================================================================
2# http://autoconf-archive.cryp.to/ac_python_devel.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7# AC_PYTHON_DEVEL([version])
8#
9# DESCRIPTION
10#
11# Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
12# in your configure.ac.
13#
14# This macro checks for Python and tries to get the include path to
15# 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
16# output variables. It also exports $(PYTHON_EXTRA_LIBS) and
17# $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
18#
19# You can search for some particular version of Python by passing a
20# parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
21# note that you *have* to pass also an operator along with the version to
22# match, and pay special attention to the single quotes surrounding the
23# version number. Don't use "PYTHON_VERSION" for this: that environment
24# variable is declared as precious and thus reserved for the end-user.
25#
26# This macro should work for all versions of Python >= 2.1.0. As an end
27# user, you can disable the check for the python version by setting the
28# PYTHON_NOVERSIONCHECK environment variable to something else than the
29# empty string.
30#
31# If you need to use this macro for an older Python version, please
32# contact the authors. We're always open for feedback.
33#
34# LAST MODIFICATION
35#
36# 2008-04-12
37#
38# COPYLEFT
39#
40# Copyright (c) 2008 Sebastian Huber <sebastian-huber@web.de>
41# Copyright (c) 2008 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
42# Copyright (c) 2008 Rafael Laboissiere <rafael@laboissiere.net>
43# Copyright (c) 2008 Andrew Collier <colliera@ukzn.ac.za>
44# Copyright (c) 2008 Matteo Settenvini <matteo@member.fsf.org>
45# Copyright (c) 2008 Horst Knorr <hk_classes@knoda.org>
46#
47# This program is free software: you can redistribute it and/or modify it
48# under the terms of the GNU General Public License as published by the
49# Free Software Foundation, either version 3 of the License, or (at your
50# option) any later version.
51#
52# This program is distributed in the hope that it will be useful, but
53# WITHOUT ANY WARRANTY; without even the implied warranty of
54# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
55# Public License for more details.
56#
57# You should have received a copy of the GNU General Public License along
58# with this program. If not, see <http://www.gnu.org/licenses/>.
59#
60# As a special exception, the respective Autoconf Macro's copyright owner
61# gives unlimited permission to copy, distribute and modify the configure
62# scripts that are the output of Autoconf when processing the Macro. You
63# need not follow the terms of the GNU General Public License when using
64# or distributing such scripts, even though portions of the text of the
65# Macro appear in them. The GNU General Public License (GPL) does govern
66# all other use of the material that constitutes the Autoconf Macro.
67#
68# This special exception to the GPL applies to versions of the Autoconf
69# Macro released by the Autoconf Macro Archive. When you make and
70# distribute a modified version of the Autoconf Macro, you may extend this
71# special exception to the GPL to apply to your modified version as well.
72
73AC_DEFUN([AC_PYTHON_DEVEL],[
74 #
75 # Allow the use of a (user set) custom python version
76 #
77 AC_ARG_VAR([PYTHON_VERSION],[The installed Python
78 version to use, for example '2.3'. This string
79 will be appended to the Python interpreter
80 canonical name.])
81
82 AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
83 if test -z "$PYTHON"; then
84 AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
85 PYTHON_VERSION=""
86 fi
87
88 #
89 # Check for a version of Python >= 2.1.0
90 #
91 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
92 ac_supports_python_ver=`$PYTHON -c "import sys, string; \
93 ver = string.split(sys.version)[[0]]; \
94 print ver >= '2.1.0'"`
95 if test "$ac_supports_python_ver" != "True"; then
96 if test -z "$PYTHON_NOVERSIONCHECK"; then
97 AC_MSG_RESULT([no])
98 AC_MSG_FAILURE([
99This version of the AC@&t@_PYTHON_DEVEL macro
100doesn't work properly with versions of Python before
1012.1.0. You may need to re-run configure, setting the
102variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
103PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
104Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
105to something else than an empty string.
106])
107 else
108 AC_MSG_RESULT([skip at user request])
109 fi
110 else
111 AC_MSG_RESULT([yes])
112 fi
113
114 #
115 # if the macro parameter ``version'' is set, honour it
116 #
117 if test -n "$1"; then
118 AC_MSG_CHECKING([for a version of Python $1])
119 ac_supports_python_ver=`$PYTHON -c "import sys, string; \
120 ver = string.split(sys.version)[[0]]; \
121 print ver $1"`
122 if test "$ac_supports_python_ver" = "True"; then
123 AC_MSG_RESULT([yes])
124 else
125 AC_MSG_RESULT([no])
126 AC_MSG_ERROR([this package requires Python $1.
127If you have it installed, but it isn't the default Python
128interpreter in your system path, please pass the PYTHON_VERSION
129variable to configure. See ``configure --help'' for reference.
130])
131 PYTHON_VERSION=""
132 fi
133 fi
134
135 #
136 # Check if you have distutils, else fail
137 #
138 AC_MSG_CHECKING([for the distutils Python package])
139 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
140 if test -z "$ac_distutils_result"; then
141 AC_MSG_RESULT([yes])
142 else
143 AC_MSG_RESULT([no])
144 AC_MSG_ERROR([cannot import Python module "distutils".
145Please check your Python installation. The error was:
146$ac_distutils_result])
147 PYTHON_VERSION=""
148 fi
149
150 #
151 # Check for Python include path
152 #
153 AC_MSG_CHECKING([for Python include path])
154 if test -z "$PYTHON_CPPFLAGS"; then
155 python_path=`$PYTHON -c "import distutils.sysconfig; \
156 print distutils.sysconfig.get_python_inc();"`
157 if test -n "${python_path}"; then
158 python_path="-I$python_path"
159 fi
160 PYTHON_CPPFLAGS=$python_path
161 fi
162 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
163 AC_SUBST([PYTHON_CPPFLAGS])
164
165 #
166 # Check for Python library path
167 #
168 AC_MSG_CHECKING([for Python library path])
169 if test -z "$PYTHON_LDFLAGS"; then
170 # (makes two attempts to ensure we've got a version number
171 # from the interpreter)
172 py_version=`$PYTHON -c "from distutils.sysconfig import *; \
173 from string import join; \
174 print join(get_config_vars('VERSION'))"`
175 if test "$py_version" == "[None]"; then
176 if test -n "$PYTHON_VERSION"; then
177 py_version=$PYTHON_VERSION
178 else
179 py_version=`$PYTHON -c "import sys; \
180 print sys.version[[:3]]"`
181 fi
182 fi
183
184 PYTHON_LDFLAGS=`$PYTHON -c "from distutils.sysconfig import *; \
185 from string import join; \
186 print '-L' + get_python_lib(0,1), \
187 '-lpython';"`$py_version
188 fi
189 AC_MSG_RESULT([$PYTHON_LDFLAGS])
190 AC_SUBST([PYTHON_LDFLAGS])
191
192 #
193 # Check for site packages
194 #
195 AC_MSG_CHECKING([for Python site-packages path])
196 if test -z "$PYTHON_SITE_PKG"; then
197 PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
198 print distutils.sysconfig.get_python_lib(0,0);"`
199 fi
200 AC_MSG_RESULT([$PYTHON_SITE_PKG])
201 AC_SUBST([PYTHON_SITE_PKG])
202
203 #
204 # libraries which must be linked in when embedding
205 #
206 AC_MSG_CHECKING(python extra libraries)
207 if test -z "$PYTHON_EXTRA_LIBS"; then
208 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
209 conf = distutils.sysconfig.get_config_var; \
210 print conf('LOCALMODLIBS'), conf('LIBS')"`
211 fi
212 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
213 AC_SUBST(PYTHON_EXTRA_LIBS)
214
215 #
216 # linking flags needed when embedding
217 #
218 AC_MSG_CHECKING(python extra linking flags)
219 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
220 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
221 conf = distutils.sysconfig.get_config_var; \
222 print conf('LINKFORSHARED')"`
223 fi
224 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
225 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
226
227 #
228 # final check to see if everything compiles alright
229 #
230 AC_MSG_CHECKING([consistency of all components of python development environment])
231 AC_LANG_PUSH([C])
232 # save current global flags
233 LIBS="$ac_save_LIBS $PYTHON_LDFLAGS"
234 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
235 AC_TRY_LINK([
236 #include <Python.h>
237 ],[
238 Py_Initialize();
239 ],[pythonexists=yes],[pythonexists=no])
240
241 AC_MSG_RESULT([$pythonexists])
242
243 if test ! "$pythonexists" = "yes"; then
244 AC_MSG_ERROR([
245 Could not link test program to Python. Maybe the main Python library has been
246 installed in some non-standard library path. If so, pass it to configure,
247 via the LDFLAGS environment variable.
248 Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
249 ============================================================================
250 ERROR!
251 You probably have to install the development version of the Python package
252 for your distribution. The exact name of this package varies among them.
253 ============================================================================
254 ])
255 PYTHON_VERSION=""
256 fi
257 AC_LANG_POP
258 # turn back to default flags
259 CPPFLAGS="$ac_save_CPPFLAGS"
260 LIBS="$ac_save_LIBS"
261
262 #
263 # all done!
264 #
265])
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