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ac_python_devel.m4 @ 323

Revision 323, 11.1 KB (checked in by trnewman, 15 years ago)
Added proper macros and cleaned up lib linking issues.

Line
1	# ===========================================================================
2	# http://www.nongnu.org/autoconf-archive/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	# LICENSE
35	#
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>
42	#
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.
47	#
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.
52	#
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/>.
55	#
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.
63	#
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.
68
69	AC_DEFUN([AC_PYTHON_DEVEL],[
70	#
71	# Allow the use of a (user set) custom python version
72	#
73	AC_ARG_VAR([PYTHON_VERSION],[The installed Python
74	version to use, for example '2.3'. This string
75	will be appended to the Python interpreter
76	canonical name.])
77
78	AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
79	if test -z "$PYTHON"; then
80	AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
81	PYTHON_VERSION=""
82	fi
83
84	#
85	# Check for a version of Python >= 2.1.0
86	#
87	AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
88	ac_supports_python_ver=`$PYTHON -c "import sys; \
89	ver = sys.version.split ()[[0]]; \
90	print (ver >= '2.1.0')"`
91	if test "$ac_supports_python_ver" != "True"; then
92	if test -z "$PYTHON_NOVERSIONCHECK"; then
93	AC_MSG_RESULT([no])
94	AC_MSG_FAILURE([
95	This version of the AC@&t@_PYTHON_DEVEL macro
96	doesn't work properly with versions of Python before
97	2.1.0. You may need to re-run configure, setting the
98	variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
99	PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
100	Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
101	to something else than an empty string.
102	])
103	else
104	AC_MSG_RESULT([skip at user request])
105	fi
106	else
107	AC_MSG_RESULT([yes])
108	fi
109
110	#
111	# if the macro parameter ``version'' is set, honour it
112	#
113	if test -n "$1"; then
114	AC_MSG_CHECKING([for a version of Python $1])
115	ac_supports_python_ver=`$PYTHON -c "import sys; \
116	ver = sys.version.split ()[[0]]; \
117	print (ver $1)"`
118	if test "$ac_supports_python_ver" = "True"; then
119	AC_MSG_RESULT([yes])
120	else
121	AC_MSG_RESULT([no])
122	AC_MSG_ERROR([this package requires Python $1.
123	If you have it installed, but it isn't the default Python
124	interpreter in your system path, please pass the PYTHON_VERSION
125	variable to configure. See ``configure --help'' for reference.
126	])
127	PYTHON_VERSION=""
128	fi
129	fi
130
131	#
132	# Check if you have distutils, else fail
133	#
134	AC_MSG_CHECKING([for the distutils Python package])
135	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
136	if test -z "$ac_distutils_result"; then
137	AC_MSG_RESULT([yes])
138	else
139	AC_MSG_RESULT([no])
140	AC_MSG_ERROR([cannot import Python module "distutils".
141	Please check your Python installation. The error was:
142	$ac_distutils_result])
143	PYTHON_VERSION=""
144	fi
145
146	#
147	# Check for Python include path
148	#
149	AC_MSG_CHECKING([for Python include path])
150	if test -z "$PYTHON_CPPFLAGS"; then
151	python_path=`$PYTHON -c "import distutils.sysconfig; \
152	print (distutils.sysconfig.get_python_inc ());"`
153	if test -n "${python_path}"; then
154	python_path="-I$python_path"
155	fi
156	PYTHON_CPPFLAGS=$python_path
157	fi
158	AC_MSG_RESULT([$PYTHON_CPPFLAGS])
159	AC_SUBST([PYTHON_CPPFLAGS])
160
161	#
162	# Check for Python library path
163	#
164	AC_MSG_CHECKING([for Python library path])
165	if test -z "$PYTHON_LDFLAGS"; then
166	# (makes two attempts to ensure we've got a version number
167	# from the interpreter)
168	ac_python_version=`cat<<EOD \| $PYTHON -
169
170	# join all versioning strings, on some systems
171	# major/minor numbers could be in different list elements
172	from distutils.sysconfig import *
173	ret = ''
174	for e in get_config_vars ('VERSION'):
175	if (e != None):
176	ret += e
177	print (ret)
178	EOD`
179
180	if test -z "$ac_python_version"; then
181	if test -n "$PYTHON_VERSION"; then
182	ac_python_version=$PYTHON_VERSION
183	else
184	ac_python_version=`$PYTHON -c "import sys; \
185	print (sys.version[[:3]])"`
186	fi
187	fi
188
189	# Make the versioning information available to the compiler
190	AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
191	[If available, contains the Python version number currently in use.])
192
193	# First, the library directory:
194	ac_python_libdir=`cat<<EOD \| $PYTHON -
195
196	# There should be only one
197	import distutils.sysconfig
198	for e in distutils.sysconfig.get_config_vars ('LIBDIR'):
199	if e != None:
200	print (e)
201	break
202	EOD`
203
204	# Before checking for libpythonX.Y, we need to know
205	# the extension the OS we're on uses for libraries
206	# (we take the first one, if there's more than one fix me!):
207	ac_python_soext=`$PYTHON -c \
208	"import distutils.sysconfig; \
209	print (distutils.sysconfig.get_config_vars('SO')[[0]])"`
210
211	# Now, for the library:
212	ac_python_soname=`$PYTHON -c \
213	"import distutils.sysconfig; \
214	print (distutils.sysconfig.get_config_vars('LDLIBRARY')[[0]])"`
215
216	# Strip away extension from the end to canonicalize its name:
217	ac_python_library=`echo "$ac_python_soname" \| sed "s/${ac_python_soext}$//"`
218
219	# This small piece shamelessly adapted from PostgreSQL python macro;
220	# credits goes to momjian, I think. I'd like to put the right name
221	# in the credits, if someone can point me in the right direction... ?
222	#
223	if test -n "$ac_python_libdir" -a -n "$ac_python_library" \
224	-a x"$ac_python_library" != x"$ac_python_soname"
225	then
226	# use the official shared library
227	ac_python_library=`echo "$ac_python_library" \| sed "s/^lib//"`
228	PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
229	else
230	# old way: use libpython from python_configdir
231	ac_python_libdir=`$PYTHON -c \
232	"from distutils.sysconfig import get_python_lib as f; \
233	import os; \
234	print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
235	PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
236	fi
237
238	if test -z "PYTHON_LDFLAGS"; then
239	AC_MSG_ERROR([
240	Cannot determine location of your Python DSO. Please check it was installed with
241	dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.
242	])
243	fi
244	fi
245	AC_MSG_RESULT([$PYTHON_LDFLAGS])
246	AC_SUBST([PYTHON_LDFLAGS])
247
248	#
249	# Check for site packages
250	#
251	AC_MSG_CHECKING([for Python site-packages path])
252	if test -z "$PYTHON_SITE_PKG"; then
253	PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
254	print (distutils.sysconfig.get_python_lib(0,0));"`
255	fi
256	AC_MSG_RESULT([$PYTHON_SITE_PKG])
257	AC_SUBST([PYTHON_SITE_PKG])
258
259	#
260	# libraries which must be linked in when embedding
261	#
262	AC_MSG_CHECKING(python extra libraries)
263	if test -z "$PYTHON_EXTRA_LIBS"; then
264	PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
265	conf = distutils.sysconfig.get_config_var; \
266	print (conf('LOCALMODLIBS') + ' ' + conf('LIBS'))"`
267	fi
268	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
269	AC_SUBST(PYTHON_EXTRA_LIBS)
270
271	#
272	# linking flags needed when embedding
273	#
274	AC_MSG_CHECKING(python extra linking flags)
275	if test -z "$PYTHON_EXTRA_LDFLAGS"; then
276	PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
277	conf = distutils.sysconfig.get_config_var; \
278	print (conf('LINKFORSHARED'))"`
279	fi
280	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
281	AC_SUBST(PYTHON_EXTRA_LDFLAGS)
282
283	#
284	# final check to see if everything compiles alright
285	#
286	AC_MSG_CHECKING([consistency of all components of python development environment])
287	# save current global flags
288	ac_save_LIBS="$LIBS"
289	ac_save_CPPFLAGS="$CPPFLAGS"
290	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
291	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
292	AC_LANG_PUSH([C])
293	AC_LINK_IFELSE([
294	AC_LANG_PROGRAM([[#include <Python.h>]],
295	[[Py_Initialize();]])
296	],[pythonexists=yes],[pythonexists=no])
297	AC_LANG_POP([C])
298	# turn back to default flags
299	CPPFLAGS="$ac_save_CPPFLAGS"
300	LIBS="$ac_save_LIBS"
301
302	AC_MSG_RESULT([$pythonexists])
303
304	if test ! "x$pythonexists" = "xyes"; then
305	AC_MSG_FAILURE([
306	Could not link test program to Python. Maybe the main Python library has been
307	installed in some non-standard library path. If so, pass it to configure,
308	via the LDFLAGS environment variable.
309	Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
310	============================================================================
311	ERROR!
312	You probably have to install the development version of the Python package
313	for your distribution. The exact name of this package varies among them.
314	============================================================================
315	])
316	PYTHON_VERSION=""
317	fi
318
319	#
320	# all done!
321	#
322	])

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