summaryrefslogtreecommitdiffstats
path: root/m4/ac_python_devel.m4
blob: f7eb79a923f6db1032ab6e3e4741623a1da771b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
# ===========================================================================
#            http://autoconf-archive.cryp.to/ac_python_devel.html
# ===========================================================================
#
# SYNOPSIS
#
#   AC_PYTHON_DEVEL([version])
#
# DESCRIPTION
#
#   Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
#   in your configure.ac.
#
#   This macro checks for Python and tries to get the include path to
#   'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LDFLAGS)
#   output variables. It also exports $(PYTHON_EXTRA_LIBS) and
#   $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
#
#   You can search for some particular version of Python by passing a
#   parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
#   note that you *have* to pass also an operator along with the version to
#   match, and pay special attention to the single quotes surrounding the
#   version number. Don't use "PYTHON_VERSION" for this: that environment
#   variable is declared as precious and thus reserved for the end-user.
#
#   This macro should work for all versions of Python >= 2.1.0. As an end
#   user, you can disable the check for the python version by setting the
#   PYTHON_NOVERSIONCHECK environment variable to something else than the
#   empty string.
#
#   If you need to use this macro for an older Python version, please
#   contact the authors. We're always open for feedback.
#
# LAST MODIFICATION
#
#   2008-04-12
#
# COPYLEFT
#
#   Copyright (c) 2008 Sebastian Huber <sebastian-huber@web.de>
#   Copyright (c) 2008 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
#   Copyright (c) 2008 Rafael Laboissiere <rafael@laboissiere.net>
#   Copyright (c) 2008 Andrew Collier <colliera@ukzn.ac.za>
#   Copyright (c) 2008 Matteo Settenvini <matteo@member.fsf.org>
#   Copyright (c) 2008 Horst Knorr <hk_classes@knoda.org>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <http://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Macro Archive. When you make and
#   distribute a modified version of the Autoconf Macro, you may extend this
#   special exception to the GPL to apply to your modified version as well.

AC_DEFUN([AC_PYTHON_DEVEL],[
	#
	# Allow the use of a (user set) custom python version
	#
	AC_ARG_VAR([PYTHON_VERSION],[The installed Python
		version to use, for example '2.3'. This string
		will be appended to the Python interpreter
		canonical name.])

	AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
	if test -z "$PYTHON"; then
	   AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
	   PYTHON_VERSION=""
	fi

	#
	# Check for a version of Python >= 2.1.0
	#
	AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
	ac_supports_python_ver=`$PYTHON -c "import sys; \
		ver = sys.version.split()[[0]]; \
		print(ver >= '2.1.0')"`
	if test "$ac_supports_python_ver" != "True"; then
		if test -z "$PYTHON_NOVERSIONCHECK"; then
			AC_MSG_RESULT([no])
			AC_MSG_FAILURE([
This version of the AC@&t@_PYTHON_DEVEL macro
doesn't work properly with versions of Python before
2.1.0. You may need to re-run configure, setting the
variables PYTHON_CPPFLAGS, PYTHON_LDFLAGS, PYTHON_SITE_PKG,
PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
to something else than an empty string.
])
		else
			AC_MSG_RESULT([skip at user request])
		fi
	else
		AC_MSG_RESULT([yes])
	fi

	#
	# if the macro parameter ``version'' is set, honour it
	#
	if test -n "$1"; then
		AC_MSG_CHECKING([for a version of Python $1])
		ac_supports_python_ver=`$PYTHON -c "import sys; \
			ver = sys.version.split()[[0]]; \
			print(ver >= '2.1.0')"`
		if test "$ac_supports_python_ver" = "True"; then
	   	   AC_MSG_RESULT([yes])
		else
			AC_MSG_RESULT([no])
			AC_MSG_ERROR([this package requires Python $1.
If you have it installed, but it isn't the default Python
interpreter in your system path, please pass the PYTHON_VERSION
variable to configure. See ``configure --help'' for reference.
])
			PYTHON_VERSION=""
		fi
	fi

	#
	# Check if you have distutils, else fail
	#
	AC_MSG_CHECKING([for the distutils Python package])
	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
	if test -z "$ac_distutils_result"; then
		AC_MSG_RESULT([yes])
	else
		AC_MSG_RESULT([no])
		AC_MSG_ERROR([cannot import Python module "distutils".
Please check your Python installation. The error was:
$ac_distutils_result])
		PYTHON_VERSION=""
	fi

	#
	# Check for Python include path
	#
	if type $PYTHON-config; then
		PYTHON_CPPFLAGS=`$PYTHON-config --includes`
	fi
	AC_MSG_CHECKING([for Python include path])
	if test -z "$PYTHON_CPPFLAGS"; then
		python_path=`$PYTHON -c "import distutils.sysconfig; \
			print(distutils.sysconfig.get_python_inc());"`
		if test -n "${python_path}"; then
		   	python_path="-I$python_path"
		fi
		PYTHON_CPPFLAGS=$python_path
	fi
	AC_MSG_RESULT([$PYTHON_CPPFLAGS])
	AC_SUBST([PYTHON_CPPFLAGS])

	#
	# Check for Python library path
	#
	AC_MSG_CHECKING([for Python library path])
	if type $PYTHON-config; then
		PYTHON_LDFLAGS=`$PYTHON-config --ldflags`
	fi
	if test -z "$PYTHON_LDFLAGS"; then
		# (makes two attempts to ensure we've got a version number
		# from the interpreter)
		py_version=`$PYTHON -c "from distutils.sysconfig import *; \
			print(' '.join(get_config_vars('VERSION')))"`
		if test "$py_version" = "[None]"; then
			if test -n "$PYTHON_VERSION"; then
				py_version=$PYTHON_VERSION
			else
				py_version=`$PYTHON -c "import sys; \
					print(sys.version[[:3]]")`
			fi
		fi

		PYTHON_LDFLAGS=`$PYTHON -c "from distutils.sysconfig import *; \
			print('-L' + get_python_lib(0,1) + \
			' -lpython');"`$py_version
	fi
	AC_MSG_RESULT([$PYTHON_LDFLAGS])
	AC_SUBST([PYTHON_LDFLAGS])

	#
	# Check for site packages
	#
	AC_MSG_CHECKING([for Python site-packages path])
	if test -z "$PYTHON_SITE_PKG"; then
		PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
		        print(distutils.sysconfig.get_python_lib(0,0))"`
	fi
	AC_MSG_RESULT([$PYTHON_SITE_PKG])
	AC_SUBST([PYTHON_SITE_PKG])

	#
	# libraries which must be linked in when embedding
	#
	AC_MSG_CHECKING(python extra libraries)
	if test -z "$PYTHON_EXTRA_LIBS"; then
	   PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
                conf = distutils.sysconfig.get_config_var; \
                print(conf('LOCALMODLIBS'), conf('LIBS'))"`
	fi
	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
	AC_SUBST(PYTHON_EXTRA_LIBS)

	#
	# linking flags needed when embedding
	#
	AC_MSG_CHECKING(python extra linking flags)
	if test -z "$PYTHON_EXTRA_LDFLAGS"; then
		PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
			conf = distutils.sysconfig.get_config_var; \
			print(conf('LINKFORSHARED'))"`
	fi
	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
	AC_SUBST(PYTHON_EXTRA_LDFLAGS)

	#
	# final check to see if everything compiles alright
	#
	AC_MSG_CHECKING([consistency of all components of python development environment])
	AC_LANG_PUSH([C])
	# save current global flags
	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS"
	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
	AC_TRY_LINK([
		#include <Python.h>
	],[
		Py_Initialize();
	],[pythonexists=yes],[pythonexists=no])

	AC_MSG_RESULT([$pythonexists])

        if test ! "$pythonexists" = "yes"; then
	   AC_MSG_ERROR([
  Could not link test program to Python. Maybe the main Python library has been
  installed in some non-standard library path. If so, pass it to configure,
  via the LDFLAGS environment variable.
  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
  ============================================================================
   ERROR!
   You probably have to install the development version of the Python package
   for your distribution.  The exact name of this package varies among them.
  ============================================================================
	   ])
	  PYTHON_VERSION=""
	fi
	AC_LANG_POP
	# turn back to default flags
	CPPFLAGS="$ac_save_CPPFLAGS"
	LIBS="$ac_save_LIBS"

	#
	# all done!
	#
])