1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_python_devel.html
3 # ===========================================================================
7 # AX_PYTHON_DEVEL([version])
11 # Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
12 # in your configure.ac.
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.
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.
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
31 # If you need to use this macro for an older Python version, please
32 # contact the authors. We're always open for feedback.
36 # Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
37 # Copyright (c) 2009 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
38 # Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
39 # Copyright (c) 2009 Andrew Collier <colliera@ukzn.ac.za>
40 # Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
41 # Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
43 # This program is free software: you can redistribute it and/or modify it
44 # under the terms of the GNU General Public License as published by the
45 # Free Software Foundation, either version 3 of the License, or (at your
46 # option) any later version.
48 # This program is distributed in the hope that it will be useful, but
49 # WITHOUT ANY WARRANTY; without even the implied warranty of
50 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
51 # Public License for more details.
53 # You should have received a copy of the GNU General Public License along
54 # with this program. If not, see <http://www.gnu.org/licenses/>.
56 # As a special exception, the respective Autoconf Macro's copyright owner
57 # gives unlimited permission to copy, distribute and modify the configure
58 # scripts that are the output of Autoconf when processing the Macro. You
59 # need not follow the terms of the GNU General Public License when using
60 # or distributing such scripts, even though portions of the text of the
61 # Macro appear in them. The GNU General Public License (GPL) does govern
62 # all other use of the material that constitutes the Autoconf Macro.
64 # This special exception to the GPL applies to versions of the Autoconf
65 # Macro released by the Autoconf Archive. When you make and distribute a
66 # modified version of the Autoconf Macro, you may extend this special
67 # exception to the GPL to apply to your modified version as well.
71 AC_DEFUN([AX_PYTHON_DEVEL],[
73 # Allow the use of a (user set) custom python version
75 AC_ARG_VAR([PYTHON_VERSION],[The installed Python
76 version to use, for example '2.3'. This string
77 will be appended to the Python interpreter
80 AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
81 if test -z "$PYTHON"; then
82 AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
87 # Check for a version of Python >= 2.1.0
89 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
90 ac_supports_python_ver=`$PYTHON -c "import sys; \
91 ver = sys.version.split ()[[0]]; \
92 print (ver >= '2.1.0')"`
93 if test "$ac_supports_python_ver" != "True"; then
94 if test -z "$PYTHON_NOVERSIONCHECK"; then
97 This version of the AC@&t@_PYTHON_DEVEL macro
98 doesn't work properly with versions of Python before
99 2.1.0. You may need to re-run configure, setting the
100 variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
101 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
102 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
103 to something else than an empty string.
106 AC_MSG_RESULT([skip at user request])
113 # if the macro parameter ``version'' is set, honour it
115 if test -n "$1"; then
116 AC_MSG_CHECKING([for a version of Python $1])
117 ac_supports_python_ver=`$PYTHON -c "import sys; \
118 ver = sys.version.split ()[[0]]; \
120 if test "$ac_supports_python_ver" = "True"; then
124 AC_MSG_ERROR([this package requires Python $1.
125 If you have it installed, but it isn't the default Python
126 interpreter in your system path, please pass the PYTHON_VERSION
127 variable to configure. See ``configure --help'' for reference.
134 # Check if you have distutils, else fail
136 AC_MSG_CHECKING([for the distutils Python package])
137 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
138 if test -z "$ac_distutils_result"; then
142 AC_MSG_ERROR([cannot import Python module "distutils".
143 Please check your Python installation. The error was:
144 $ac_distutils_result])
149 # Check for Python include path
151 AC_MSG_CHECKING([for Python include path])
152 if test -z "$PYTHON_CPPFLAGS"; then
153 python_path=`$PYTHON -c "import distutils.sysconfig; \
154 print (distutils.sysconfig.get_python_inc ());"`
155 if test -n "${python_path}"; then
156 python_path="-I$python_path"
158 PYTHON_CPPFLAGS=$python_path
160 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
161 AC_SUBST([PYTHON_CPPFLAGS])
164 # Check for Python library path
166 AC_MSG_CHECKING([for Python library path])
167 if test -z "$PYTHON_LDFLAGS"; then
168 # (makes two attempts to ensure we've got a version number
169 # from the interpreter)
170 ac_python_version=`cat<<EOD | $PYTHON -
172 # join all versioning strings, on some systems
173 # major/minor numbers could be in different list elements
174 from distutils.sysconfig import *
176 for e in get_config_vars ('VERSION'):
182 if test -z "$ac_python_version"; then
183 if test -n "$PYTHON_VERSION"; then
184 ac_python_version=$PYTHON_VERSION
186 ac_python_version=`$PYTHON -c "import sys; \
187 print (sys.version[[:3]])"`
191 # Make the versioning information available to the compiler
192 AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
193 [If available, contains the Python version number currently in use.])
195 # First, the library directory:
196 ac_python_libdir=`cat<<EOD | $PYTHON -
198 # There should be only one
199 import distutils.sysconfig
200 for e in distutils.sysconfig.get_config_vars ('LIBDIR'):
206 # Before checking for libpythonX.Y, we need to know
207 # the extension the OS we're on uses for libraries
208 # (we take the first one, if there's more than one fix me!):
209 ac_python_soext=`$PYTHON -c \
210 "import distutils.sysconfig; \
211 print (distutils.sysconfig.get_config_vars('SO')[[0]])"`
213 # Now, for the library:
214 ac_python_soname=`$PYTHON -c \
215 "import distutils.sysconfig; \
216 print (distutils.sysconfig.get_config_vars('LDLIBRARY')[[0]])"`
218 # Strip away extension from the end to canonicalize its name:
219 ac_python_library=`echo "$ac_python_soname" | sed "s/${ac_python_soext}$//"`
221 # This small piece shamelessly adapted from PostgreSQL python macro;
222 # credits goes to momjian, I think. I'd like to put the right name
223 # in the credits, if someone can point me in the right direction... ?
225 if test -n "$ac_python_libdir" -a -n "$ac_python_library" \
226 -a x"$ac_python_library" != x"$ac_python_soname"
228 # use the official shared library
229 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
230 PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
232 # old way: use libpython from python_configdir
233 ac_python_libdir=`$PYTHON -c \
234 "from distutils.sysconfig import get_python_lib as f; \
236 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
237 PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
240 if test -z "PYTHON_LDFLAGS"; then
242 Cannot determine location of your Python DSO. Please check it was installed with
243 dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
247 AC_MSG_RESULT([$PYTHON_LDFLAGS])
248 AC_SUBST([PYTHON_LDFLAGS])
251 # Check for site packages
253 AC_MSG_CHECKING([for Python site-packages path])
254 if test -z "$PYTHON_SITE_PKG"; then
255 PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
256 print (distutils.sysconfig.get_python_lib(0,0));"`
258 AC_MSG_RESULT([$PYTHON_SITE_PKG])
259 AC_SUBST([PYTHON_SITE_PKG])
262 # libraries which must be linked in when embedding
264 AC_MSG_CHECKING(python extra libraries)
265 if test -z "$PYTHON_EXTRA_LIBS"; then
266 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
267 conf = distutils.sysconfig.get_config_var; \
268 print (conf('LOCALMODLIBS') + ' ' + conf('LIBS'))"`
270 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
271 AC_SUBST(PYTHON_EXTRA_LIBS)
274 # linking flags needed when embedding
276 AC_MSG_CHECKING(python extra linking flags)
277 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
278 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
279 conf = distutils.sysconfig.get_config_var; \
280 print (conf('LINKFORSHARED'))"`
282 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
283 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
286 # final check to see if everything compiles alright
288 AC_MSG_CHECKING([consistency of all components of python development environment])
289 # save current global flags
291 ac_save_CPPFLAGS="$CPPFLAGS"
292 LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
293 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
296 AC_LANG_PROGRAM([[#include <Python.h>]],
297 [[Py_Initialize();]])
298 ],[pythonexists=yes],[pythonexists=no])
300 # turn back to default flags
301 CPPFLAGS="$ac_save_CPPFLAGS"
304 AC_MSG_RESULT([$pythonexists])
306 if test ! "x$pythonexists" = "xyes"; then
308 Could not link test program to Python. Maybe the main Python library has been
309 installed in some non-standard library path. If so, pass it to configure,
310 via the LDFLAGS environment variable.
311 Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
312 ============================================================================
314 You probably have to install the development version of the Python package
315 for your distribution. The exact name of this package varies among them.
316 ============================================================================
325 AC_DEFUN([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])