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
38 # Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
39 # Copyright (c) 2009 Andrew Collier
40 # Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
41 # Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
42 # Copyright (c) 2013 Daniel Mullner <muellner@math.stanford.edu>
44 # This program is free software: you can redistribute it and/or modify it
45 # under the terms of the GNU General Public License as published by the
46 # Free Software Foundation, either version 3 of the License, or (at your
47 # option) any later version.
49 # This program is distributed in the hope that it will be useful, but
50 # WITHOUT ANY WARRANTY; without even the implied warranty of
51 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
52 # Public License for more details.
54 # You should have received a copy of the GNU General Public License along
55 # with this program. If not, see <http://www.gnu.org/licenses/>.
57 # As a special exception, the respective Autoconf Macro's copyright owner
58 # gives unlimited permission to copy, distribute and modify the configure
59 # scripts that are the output of Autoconf when processing the Macro. You
60 # need not follow the terms of the GNU General Public License when using
61 # or distributing such scripts, even though portions of the text of the
62 # Macro appear in them. The GNU General Public License (GPL) does govern
63 # all other use of the material that constitutes the Autoconf Macro.
65 # This special exception to the GPL applies to versions of the Autoconf
66 # Macro released by the Autoconf Archive. When you make and distribute a
67 # modified version of the Autoconf Macro, you may extend this special
68 # exception to the GPL to apply to your modified version as well.
72 AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
73 AC_DEFUN([AX_PYTHON_DEVEL],[
75 # Allow the use of a (user set) custom python version
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
82 AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
83 if test -z "$PYTHON"; then
84 AC_MSG_WARN([Cannot find python$PYTHON_VERSION in your system path])
89 AS_IF([test -z "$no_python_devel"], [
91 # Check for a version of Python >= 2.1.0
93 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
94 ac_supports_python_ver=`$PYTHON -c "import sys; \
95 ver = sys.version.split ()[[0]]; \
96 print (ver >= '2.1.0')"`
97 if test "$ac_supports_python_ver" != "True"; then
98 if test -z "$PYTHON_NOVERSIONCHECK"; then
101 This version of the AC@&t@_PYTHON_DEVEL macro
102 doesn't work properly with versions of Python before
103 2.1.0. You may need to re-run configure, setting the
104 variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
105 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
106 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
107 to something else than an empty string.
111 AC_MSG_RESULT([skip at user request])
118 AS_IF([test -z "$no_python_devel"], [
120 # if the macro parameter ``version'' is set, honour it
122 if test -n "$1"; then
123 AC_MSG_CHECKING([for a version of Python $1])
124 ac_supports_python_ver=`$PYTHON -c "import sys; \
125 ver = sys.version.split ()[[0]]; \
127 if test "$ac_supports_python_ver" = "True"; then
131 AC_MSG_WARN([this package requires Python $1.
132 If you have it installed, but it isn't the default Python
133 interpreter in your system path, please pass the PYTHON_VERSION
134 variable to configure. See ``configure --help'' for reference.
142 AS_IF([test -z "$no_python_devel"], [
144 # Check if you have distutils, else fail
146 AC_MSG_CHECKING([for the distutils Python package])
147 ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
148 if test -z "$ac_distutils_result"; then
152 AC_MSG_WARN([cannot import Python module "distutils".
153 Please check your Python installation. The error was:
154 $ac_distutils_result])
160 AS_IF([test -z "$no_python_devel"], [
162 # Check for Python include path
164 AC_MSG_CHECKING([for Python include path])
165 if test -z "$PYTHON_CPPFLAGS"; then
166 python_path=`$PYTHON -c "import distutils.sysconfig; \
167 print (distutils.sysconfig.get_python_inc ());"`
168 plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
169 print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
170 if test -n "${python_path}"; then
171 if test "${plat_python_path}" != "${python_path}"; then
172 python_path="-I$python_path -I$plat_python_path"
174 python_path="-I$python_path"
177 PYTHON_CPPFLAGS=$python_path
179 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
180 AC_SUBST([PYTHON_CPPFLAGS])
183 # Check for Python library path
185 AC_MSG_CHECKING([for Python library path])
186 if test -z "$PYTHON_LDFLAGS"; then
187 # (makes two attempts to ensure we've got a version number
188 # from the interpreter)
189 ac_python_version=`cat<<EOD | $PYTHON -
191 # join all versioning strings, on some systems
192 # major/minor numbers could be in different list elements
193 from distutils.sysconfig import *
194 e = get_config_var('VERSION')
199 if test -z "$ac_python_version"; then
200 if test -n "$PYTHON_VERSION"; then
201 ac_python_version=$PYTHON_VERSION
203 ac_python_version=`$PYTHON -c "import sys; \
204 print (sys.version[[:3]])"`
208 # Make the versioning information available to the compiler
209 AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
210 [If available, contains the Python version number currently in use.])
212 # First, the library directory:
213 ac_python_libdir=`cat<<EOD | $PYTHON -
215 # There should be only one
216 import distutils.sysconfig
217 e = distutils.sysconfig.get_config_var('LIBDIR')
222 # Now, for the library:
223 ac_python_library=`cat<<EOD | $PYTHON -
225 import distutils.sysconfig
226 c = distutils.sysconfig.get_config_vars()
228 print ('python'+c[['LDVERSION']])
230 print ('python'+c[['VERSION']])
233 # This small piece shamelessly adapted from PostgreSQL python macro;
234 # credits goes to momjian, I think. I'd like to put the right name
235 # in the credits, if someone can point me in the right direction... ?
237 if test -n "$ac_python_libdir" -a -n "$ac_python_library"
239 # use the official shared library
240 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
241 PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
243 # old way: use libpython from python_configdir
244 ac_python_libdir=`$PYTHON -c \
245 "from distutils.sysconfig import get_python_lib as f; \
247 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
248 PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
251 if test -z "PYTHON_LDFLAGS"; then
253 Cannot determine location of your Python DSO. Please check it was installed with
254 dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
259 AC_MSG_RESULT([$PYTHON_LDFLAGS])
260 AC_SUBST([PYTHON_LDFLAGS])
263 AS_IF([test -z "$no_python_devel"], [
265 # Check for site packages
267 AC_MSG_CHECKING([for Python site-packages path])
268 if test -z "$PYTHON_SITE_PKG"; then
269 PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
270 print (distutils.sysconfig.get_python_lib(0,0));"`
272 AC_MSG_RESULT([$PYTHON_SITE_PKG])
273 AC_SUBST([PYTHON_SITE_PKG])
276 # libraries which must be linked in when embedding
278 AC_MSG_CHECKING(python extra libraries)
279 if test -z "$PYTHON_EXTRA_LIBS"; then
280 PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
281 conf = distutils.sysconfig.get_config_var; \
282 print (conf('LIBS'))"`
284 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
285 AC_SUBST(PYTHON_EXTRA_LIBS)
288 # linking flags needed when embedding
290 AC_MSG_CHECKING(python extra linking flags)
291 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
292 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
293 conf = distutils.sysconfig.get_config_var; \
294 print (conf('LINKFORSHARED'))"`
296 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
297 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
300 # final check to see if everything compiles alright
302 AC_MSG_CHECKING([consistency of all components of python development environment])
303 # save current global flags
305 ac_save_CPPFLAGS="$CPPFLAGS"
306 LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
307 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
310 AC_LANG_PROGRAM([[#include <Python.h>]],
311 [[Py_Initialize();]])
312 ],[pythonexists=yes],[pythonexists=no])
314 # turn back to default flags
315 CPPFLAGS="$ac_save_CPPFLAGS"
318 AC_MSG_RESULT([$pythonexists])
320 if test ! "x$pythonexists" = "xyes"; then
322 Could not link test program to Python. Maybe the main Python library has been
323 installed in some non-standard library path. If so, pass it to configure,
324 via the LDFLAGS environment variable.
325 Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
326 ============================================================================
328 You probably have to install the development version of the Python package
329 for your distribution. The exact name of this package varies among them.
330 ============================================================================
341 AS_IF([test -z "$no_python_devel"],
342 [have_python_dev=yes], [have_python_dev=no])