1 # ===========================================================================
2 # https://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_LIBS) output
16 # 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 <https://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 "$PYTHON"; then
84 AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
89 # Check for a version of Python >= 2.1.0
91 AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
92 ac_supports_python_ver=`$PYTHON -c "import sys; \
93 ver = sys.version.split ()[[0]]; \
94 print (ver >= '2.1.0')"`
95 if test "$ac_supports_python_ver" != "True"; then
96 if test -z "$PYTHON_NOVERSIONCHECK"; then
99 This version of the AC@&t@_PYTHON_DEVEL macro
100 doesn't work properly with versions of Python before
101 2.1.0. You may need to re-run configure, setting the
102 variables PYTHON_CPPFLAGS, PYTHON_LIBS, PYTHON_SITE_PKG,
103 PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
104 Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
105 to something else than an empty string.
108 AC_MSG_RESULT([skip at user request])
115 # if the macro parameter ``version'' is set, honour it
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; \
120 ver = sys.version.split ()[[0]]; \
122 if test "$ac_supports_python_ver" = "True"; then
126 AC_MSG_ERROR([this package requires Python $1.
127 If you have it installed, but it isn't the default Python
128 interpreter in your system path, please pass the PYTHON_VERSION
129 variable to configure. See ``configure --help'' for reference.
136 # Check if you have distutils, else fail
138 AC_MSG_CHECKING([for the sysconfig Python package])
139 ac_sysconfig_result=`$PYTHON -c "import sysconfig" 2>&1`
140 if test $? -eq 0; then
142 IMPORT_SYSCONFIG="import sysconfig"
146 AC_MSG_CHECKING([for the distutils Python package])
147 ac_sysconfig_result=`$PYTHON -c "from distutils import sysconfig" 2>&1`
148 if test $? -eq 0; then
150 IMPORT_SYSCONFIG="from distutils import sysconfig"
152 AC_MSG_ERROR([cannot import Python module "distutils".
153 Please check your Python installation. The error was:
154 $ac_sysconfig_result])
160 # Check for Python include path
162 AC_MSG_CHECKING([for Python include path])
163 if test -z "$PYTHON_CPPFLAGS"; then
164 if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
165 # sysconfig module has different functions
166 python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
167 print (sysconfig.get_path ('include'));"`
168 plat_python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
169 print (sysconfig.get_path ('platinclude'));"`
172 python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
173 print (sysconfig.get_python_inc ());"`
174 plat_python_path=`$PYTHON -c "$IMPORT_SYSCONFIG; \
175 print (sysconfig.get_python_inc (plat_specific=1));"`
177 if test -n "${python_path}"; then
178 if test "${plat_python_path}" != "${python_path}"; then
179 python_path="-I$python_path -I$plat_python_path"
181 python_path="-I$python_path"
184 PYTHON_CPPFLAGS=$python_path
186 AC_MSG_RESULT([$PYTHON_CPPFLAGS])
187 AC_SUBST([PYTHON_CPPFLAGS])
190 # Check for Python library path
192 AC_MSG_CHECKING([for Python library path])
193 if test -z "$PYTHON_LIBS"; then
194 # (makes two attempts to ensure we've got a version number
195 # from the interpreter)
196 ac_python_version=`cat<<EOD | $PYTHON -
198 # join all versioning strings, on some systems
199 # major/minor numbers could be in different list elements
200 from sysconfig import *
201 e = get_config_var('VERSION')
206 if test -z "$ac_python_version"; then
207 if test -n "$PYTHON_VERSION"; then
208 ac_python_version=$PYTHON_VERSION
210 ac_python_version=`$PYTHON -c "import sys; \
211 print (sys.version[[:3]])"`
215 # Make the versioning information available to the compiler
216 AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
217 [If available, contains the Python version number currently in use.])
219 # First, the library directory:
220 ac_python_libdir=`cat<<EOD | $PYTHON -
222 # There should be only one
224 e = sysconfig.get_config_var('LIBDIR')
229 # Now, for the library:
230 ac_python_library=`cat<<EOD | $PYTHON -
233 c = sysconfig.get_config_vars()
235 print ('python'+c[['LDVERSION']])
237 print ('python'+c[['VERSION']])
240 # This small piece shamelessly adapted from PostgreSQL python macro;
241 # credits goes to momjian, I think. I'd like to put the right name
242 # in the credits, if someone can point me in the right direction... ?
244 if test -n "$ac_python_libdir" -a -n "$ac_python_library"
246 # use the official shared library
247 ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
248 PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
250 # old way: use libpython from python_configdir
251 ac_python_libdir=`$PYTHON -c \
252 "from sysconfig import get_python_lib as f; \
254 print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
255 PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
258 if test -z "PYTHON_LIBS"; then
260 Cannot determine location of your Python DSO. Please check it was installed with
261 dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
265 AC_MSG_RESULT([$PYTHON_LIBS])
266 AC_SUBST([PYTHON_LIBS])
269 # Check for site packages
271 AC_MSG_CHECKING([for Python site-packages path])
272 if test -z "$PYTHON_SITE_PKG"; then
273 if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
274 PYTHON_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
275 print (sysconfig.get_path('purelib'));"`
277 # distutils.sysconfig way
278 PYTHON_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
279 print (sysconfig.get_python_lib(0,0));"`
282 AC_MSG_RESULT([$PYTHON_SITE_PKG])
283 AC_SUBST([PYTHON_SITE_PKG])
286 # Check for platform-specific site packages
288 AC_MSG_CHECKING([for Python platform specific site-packages path])
289 if test -z "$PYTHON_SITE_PKG"; then
290 if test "$IMPORT_SYSCONFIG" = "import sysconfig"; then
291 PYTHON_PLATFORM_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
292 print (sysconfig.get_path('platlib'));"`
294 # distutils.sysconfig way
295 PYTHON_PLATFORM_SITE_PKG=`$PYTHON -c "$IMPORT_SYSCONFIG; \
296 print (sysconfig.get_python_lib(1,0));"`
299 AC_MSG_RESULT([$PYTHON_PLATFORM_SITE_PKG])
300 AC_SUBST([PYTHON_PLATFORM_SITE_PKG])
303 # libraries which must be linked in when embedding
305 AC_MSG_CHECKING(python extra libraries)
306 if test -z "$PYTHON_EXTRA_LIBS"; then
307 PYTHON_EXTRA_LIBS=`$PYTHON -c "$IMPORT_SYSCONFIG; \
308 conf = sysconfig.get_config_var; \
309 print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
311 AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
312 AC_SUBST(PYTHON_EXTRA_LIBS)
315 # linking flags needed when embedding
317 AC_MSG_CHECKING(python extra linking flags)
318 if test -z "$PYTHON_EXTRA_LDFLAGS"; then
319 PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "$IMPORT_SYSCONFIG; \
320 conf = sysconfig.get_config_var; \
321 print (conf('LINKFORSHARED'))"`
323 AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
324 AC_SUBST(PYTHON_EXTRA_LDFLAGS)
327 # final check to see if everything compiles alright
329 AC_MSG_CHECKING([consistency of all components of python development environment])
330 # save current global flags
332 ac_save_LDFLAGS="$LDFLAGS"
333 ac_save_CPPFLAGS="$CPPFLAGS"
334 LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS $PYTHON_EXTRA_LIBS"
335 LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
336 CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
339 AC_LANG_PROGRAM([[#include <Python.h>]],
340 [[Py_Initialize();]])
341 ],[pythonexists=yes],[pythonexists=no])
343 # turn back to default flags
344 CPPFLAGS="$ac_save_CPPFLAGS"
346 LDFLAGS="$ac_save_LDFLAGS"
348 AC_MSG_RESULT([$pythonexists])
350 if test ! "x$pythonexists" = "xyes"; then
352 Could not link test program to Python. Maybe the main Python library has been
353 installed in some non-standard library path. If so, pass it to configure,
354 via the LIBS environment variable.
355 Example: ./configure LIBS="-L/usr/non-standard-path/python/lib"
356 ============================================================================
358 You probably have to install the development version of the Python package
359 for your distribution. The exact name of this package varies among them.
360 ============================================================================