[mirror_zfs.git] / config / ax_python_devel.m4

# ===========================================================================
#     https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_PYTHON_DEVEL([version], [action-if-not-found])
#
# DESCRIPTION
#
#   Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
#   in your configure.ac.
#
#   Note: this is a slightly modified version of the original AX_PYTHON_DEVEL
#   macro which accepts an additional [action-if-not-found] argument. This
#   allow to detect if Python development is available without aborting the
#   configure phase with an hard error in case it is not.
#
#   This macro checks for Python and tries to get the include path to
#   'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LIBS) 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.
#
# LICENSE
#
#   Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
#   Copyright (c) 2009 Alan W. Irwin
#   Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
#   Copyright (c) 2009 Andrew Collier
#   Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
#   Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
#   Copyright (c) 2013 Daniel Mullner <muellner@math.stanford.edu>
#   Copyright (c) 2018 loli10K <ezomori.nozomu@gmail.com>
#
#   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 <https://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 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.

#serial 21

AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
AC_DEFUN([AX_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
		m4_ifvaln([$2],[$2],[
			AC_MSG_ERROR([Cannot find python$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])
			m4_ifvaln([$2],[$2],[
				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_LIBS, 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 $1)"`
		if test "$ac_supports_python_ver" = "True"; then
		   AC_MSG_RESULT([yes])
		else
			AC_MSG_RESULT([no])
			m4_ifvaln([$2],[$2],[
				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 $? -eq 0; then
		AC_MSG_RESULT([yes])
	else
		AC_MSG_RESULT([no])
		m4_ifvaln([$2],[$2],[
			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
	#
	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 ());"`
		plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
			print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
		if test -n "${python_path}"; then
			if test "${plat_python_path}" != "${python_path}"; then
				python_path="-I$python_path -I$plat_python_path"
			else
				python_path="-I$python_path"
			fi
		fi
		PYTHON_CPPFLAGS=$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 test -z "$PYTHON_LIBS"; then
		# (makes two attempts to ensure we've got a version number
		# from the interpreter)
		ac_python_version=`cat<<EOD | $PYTHON -

# join all versioning strings, on some systems
# major/minor numbers could be in different list elements
from distutils.sysconfig import *
e = get_config_var('VERSION')
if e is not None:
	print(e)
EOD`

		if test -z "$ac_python_version"; then
			if test -n "$PYTHON_VERSION"; then
				ac_python_version=$PYTHON_VERSION
			else
				ac_python_version=`$PYTHON -c "import sys; \
					print (sys.version[[:3]])"`
			fi
		fi

		# Make the versioning information available to the compiler
		AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
                                   [If available, contains the Python version number currently in use.])

		# First, the library directory:
		ac_python_libdir=`cat<<EOD | $PYTHON -

# There should be only one
import distutils.sysconfig
e = distutils.sysconfig.get_config_var('LIBDIR')
if e is not None:
	print (e)
EOD`

		# Now, for the library:
		ac_python_library=`cat<<EOD | $PYTHON -

import distutils.sysconfig
c = distutils.sysconfig.get_config_vars()
if 'LDVERSION' in c:
	print ('python'+c[['LDVERSION']])
else:
	print ('python'+c[['VERSION']])
EOD`

		# This small piece shamelessly adapted from PostgreSQL python macro;
		# credits goes to momjian, I think. I'd like to put the right name
		# in the credits, if someone can point me in the right direction... ?
		#
		if test -n "$ac_python_libdir" -a -n "$ac_python_library"
		then
			# use the official shared library
			ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
			PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
		else
			# old way: use libpython from python_configdir
			ac_python_libdir=`$PYTHON -c \
			  "from distutils.sysconfig import get_python_lib as f; \
			  import os; \
			  print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
			PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
		fi

		if test -z "PYTHON_LIBS"; then
			m4_ifvaln([$2],[$2],[
				AC_MSG_ERROR([
  Cannot determine location of your Python DSO. Please check it was installed with
  dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
				])
			])
		fi
	fi
	AC_MSG_RESULT([$PYTHON_LIBS])
	AC_SUBST([PYTHON_LIBS])

	#
	# 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('LIBS') + ' ' + conf('SYSLIBS'))"`
	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])
	# save current global flags
	ac_save_LIBS="$LIBS"
	ac_save_LDFLAGS="$LDFLAGS"
	ac_save_CPPFLAGS="$CPPFLAGS"
	LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS $PYTHON_EXTRA_LIBS"
	LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
	AC_LANG_PUSH([C])
	AC_LINK_IFELSE([
		AC_LANG_PROGRAM([[#include <Python.h>]],
				[[Py_Initialize();]])
		],[pythonexists=yes],[pythonexists=no])
	AC_LANG_POP([C])
	# turn back to default flags
	CPPFLAGS="$ac_save_CPPFLAGS"
	LIBS="$ac_save_LIBS"
	LDFLAGS="$ac_save_LDFLAGS"

	AC_MSG_RESULT([$pythonexists])

        if test ! "x$pythonexists" = "xyes"; then
		m4_ifvaln([$2],[$2],[
			AC_MSG_FAILURE([
  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 LIBS environment variable.
  Example: ./configure LIBS="-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

	#
	# all done!
	#
])
Commit	Line	Data
85ce3f4f	1	# ===========================================================================
	2	# https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
	3	# ===========================================================================
	4	#
	5	# SYNOPSIS
	6	#
	7	# AX_PYTHON_DEVEL([version], [action-if-not-found])
	8	#
	9	# DESCRIPTION
	10	#
	11	# Note: Defines as a precious variable "PYTHON_VERSION". Don't override it
	12	# in your configure.ac.
	13	#
	14	# Note: this is a slightly modified version of the original AX_PYTHON_DEVEL
	15	# macro which accepts an additional [action-if-not-found] argument. This
	16	# allow to detect if Python development is available without aborting the
	17	# configure phase with an hard error in case it is not.
	18	#
	19	# This macro checks for Python and tries to get the include path to
	20	# 'Python.h'. It provides the $(PYTHON_CPPFLAGS) and $(PYTHON_LIBS) output
	21	# variables. It also exports $(PYTHON_EXTRA_LIBS) and
	22	# $(PYTHON_EXTRA_LDFLAGS) for embedding Python in your code.
	23	#
	24	# You can search for some particular version of Python by passing a
	25	# parameter to this macro, for example ">= '2.3.1'", or "== '2.4'". Please
	26	# note that you have to pass also an operator along with the version to
	27	# match, and pay special attention to the single quotes surrounding the
	28	# version number. Don't use "PYTHON_VERSION" for this: that environment
	29	# variable is declared as precious and thus reserved for the end-user.
	30	#
	31	# This macro should work for all versions of Python >= 2.1.0. As an end
	32	# user, you can disable the check for the python version by setting the
	33	# PYTHON_NOVERSIONCHECK environment variable to something else than the
	34	# empty string.
	35	#
	36	# If you need to use this macro for an older Python version, please
	37	# contact the authors. We're always open for feedback.
	38	#
	39	# LICENSE
	40	#
	41	# Copyright (c) 2009 Sebastian Huber <sebastian-huber@web.de>
	42	# Copyright (c) 2009 Alan W. Irwin
	43	# Copyright (c) 2009 Rafael Laboissiere <rafael@laboissiere.net>
	44	# Copyright (c) 2009 Andrew Collier
	45	# Copyright (c) 2009 Matteo Settenvini <matteo@member.fsf.org>
	46	# Copyright (c) 2009 Horst Knorr <hk_classes@knoda.org>
	47	# Copyright (c) 2013 Daniel Mullner <muellner@math.stanford.edu>
	48	# Copyright (c) 2018 loli10K <ezomori.nozomu@gmail.com>
	49	#
	50	# This program is free software: you can redistribute it and/or modify it
	51	# under the terms of the GNU General Public License as published by the
	52	# Free Software Foundation, either version 3 of the License, or (at your
	53	# option) any later version.
	54	#
	55	# This program is distributed in the hope that it will be useful, but
	56	# WITHOUT ANY WARRANTY; without even the implied warranty of
	57	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	58	# Public License for more details.
	59	#
	60	# You should have received a copy of the GNU General Public License along
	61	# with this program. If not, see <https://www.gnu.org/licenses/>.
	62	#
	63	# As a special exception, the respective Autoconf Macro's copyright owner
	64	# gives unlimited permission to copy, distribute and modify the configure
65	# scripts that are the output of Autoconf when processing the Macro. You
66	# need not follow the terms of the GNU General Public License when using
67	# or distributing such scripts, even though portions of the text of the
68	# Macro appear in them. The GNU General Public License (GPL) does govern
69	# all other use of the material that constitutes the Autoconf Macro.
70	#
71	# This special exception to the GPL applies to versions of the Autoconf
72	# Macro released by the Autoconf Archive. When you make and distribute a
73	# modified version of the Autoconf Macro, you may extend this special
74	# exception to the GPL to apply to your modified version as well.
75
76	#serial 21
77
78	AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
79	AC_DEFUN([AX_PYTHON_DEVEL],[
80	#
81	# Allow the use of a (user set) custom python version
82	#
83	AC_ARG_VAR([PYTHON_VERSION],[The installed Python
84	version to use, for example '2.3'. This string
85	will be appended to the Python interpreter
86	canonical name.])
87
88	AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
89	if test -z "$PYTHON"; then
90	m4_ifvaln([$2],[$2],[
91	AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
92	PYTHON_VERSION=""
93	])
94	fi
95
96	#
97	# Check for a version of Python >= 2.1.0
98	#
99	AC_MSG_CHECKING([for a version of Python >= '2.1.0'])
100	ac_supports_python_ver=`$PYTHON -c "import sys; \
101	ver = sys.version.split ()[[0]]; \
102	print (ver >= '2.1.0')"`
103	if test "$ac_supports_python_ver" != "True"; then
104	if test -z "$PYTHON_NOVERSIONCHECK"; then
105	AC_MSG_RESULT([no])
106	m4_ifvaln([$2],[$2],[
107	AC_MSG_FAILURE([
108	This version of the AC@&t@_PYTHON_DEVEL macro
109	doesn't work properly with versions of Python before
110	2.1.0. You may need to re-run configure, setting the
111	variables PYTHON_CPPFLAGS, PYTHON_LIBS, PYTHON_SITE_PKG,
112	PYTHON_EXTRA_LIBS and PYTHON_EXTRA_LDFLAGS by hand.
113	Moreover, to disable this check, set PYTHON_NOVERSIONCHECK
114	to something else than an empty string.
115	])
116	])
117	else
118	AC_MSG_RESULT([skip at user request])
119	fi
120	else
121	AC_MSG_RESULT([yes])
122	fi
123
124	#
125	# if the macro parameter ``version'' is set, honour it
126	#
127	if test -n "$1"; then
128	AC_MSG_CHECKING([for a version of Python $1])
129	ac_supports_python_ver=`$PYTHON -c "import sys; \
130	ver = sys.version.split ()[[0]]; \
131	print (ver $1)"`
132	if test "$ac_supports_python_ver" = "True"; then
133	AC_MSG_RESULT([yes])
134	else
135	AC_MSG_RESULT([no])
136	m4_ifvaln([$2],[$2],[
137	AC_MSG_ERROR([this package requires Python $1.
138	If you have it installed, but it isn't the default Python
139	interpreter in your system path, please pass the PYTHON_VERSION
140	variable to configure. See ``configure --help'' for reference.
141	])
142	PYTHON_VERSION=""
143	])
144	fi
145	fi
146
147	#
148	# Check if you have distutils, else fail
149	#
150	AC_MSG_CHECKING([for the distutils Python package])
151	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
152	if test $? -eq 0; then
153	AC_MSG_RESULT([yes])
154	else
155	AC_MSG_RESULT([no])
156	m4_ifvaln([$2],[$2],[
157	AC_MSG_ERROR([cannot import Python module "distutils".
158	Please check your Python installation. The error was:
159	$ac_distutils_result])
160	PYTHON_VERSION=""
161	])
162	fi
163
164	#
165	# Check for Python include path
166	#
167	AC_MSG_CHECKING([for Python include path])
168	if test -z "$PYTHON_CPPFLAGS"; then
169	python_path=`$PYTHON -c "import distutils.sysconfig; \
170	print (distutils.sysconfig.get_python_inc ());"`
171	plat_python_path=`$PYTHON -c "import distutils.sysconfig; \
172	print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
173	if test -n "${python_path}"; then
174	if test "${plat_python_path}" != "${python_path}"; then
175	python_path="-I$python_path -I$plat_python_path"
176	else
177	python_path="-I$python_path"
178	fi
179	fi
180	PYTHON_CPPFLAGS=$python_path
181	fi
182	AC_MSG_RESULT([$PYTHON_CPPFLAGS])
183	AC_SUBST([PYTHON_CPPFLAGS])
184
185	#
186	# Check for Python library path
187	#
188	AC_MSG_CHECKING([for Python library path])
189	if test -z "$PYTHON_LIBS"; then
190	# (makes two attempts to ensure we've got a version number
191	# from the interpreter)
192	ac_python_version=`cat<<EOD \| $PYTHON -
193
194	# join all versioning strings, on some systems
195	# major/minor numbers could be in different list elements
196	from distutils.sysconfig import *
197	e = get_config_var('VERSION')
198	if e is not None:
199	print(e)
200	EOD`
201
202	if test -z "$ac_python_version"; then
203	if test -n "$PYTHON_VERSION"; then
204	ac_python_version=$PYTHON_VERSION
205	else
206	ac_python_version=`$PYTHON -c "import sys; \
207	print (sys.version[[:3]])"`
208	fi
209	fi
210
211	# Make the versioning information available to the compiler
212	AC_DEFINE_UNQUOTED([HAVE_PYTHON], ["$ac_python_version"],
213	[If available, contains the Python version number currently in use.])
214
215	# First, the library directory:
216	ac_python_libdir=`cat<<EOD \| $PYTHON -
217
218	# There should be only one
219	import distutils.sysconfig
220	e = distutils.sysconfig.get_config_var('LIBDIR')
221	if e is not None:
222	print (e)
223	EOD`
224
225	# Now, for the library:
226	ac_python_library=`cat<<EOD \| $PYTHON -
227
228	import distutils.sysconfig
229	c = distutils.sysconfig.get_config_vars()
230	if 'LDVERSION' in c:
231	print ('python'+c[['LDVERSION']])
232	else:
233	print ('python'+c[['VERSION']])
234	EOD`
235
236	# This small piece shamelessly adapted from PostgreSQL python macro;
237	# credits goes to momjian, I think. I'd like to put the right name
238	# in the credits, if someone can point me in the right direction... ?
239	#
240	if test -n "$ac_python_libdir" -a -n "$ac_python_library"
241	then
242	# use the official shared library
243	ac_python_library=`echo "$ac_python_library" \| sed "s/^lib//"`
244	PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
245	else
246	# old way: use libpython from python_configdir
247	ac_python_libdir=`$PYTHON -c \
248	"from distutils.sysconfig import get_python_lib as f; \
249	import os; \
250	print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
251	PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
252	fi
253
254	if test -z "PYTHON_LIBS"; then
255	m4_ifvaln([$2],[$2],[
256	AC_MSG_ERROR([
257	Cannot determine location of your Python DSO. Please check it was installed with
258	dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
259	])
260	])
261	fi
262	fi
263	AC_MSG_RESULT([$PYTHON_LIBS])
264	AC_SUBST([PYTHON_LIBS])
265
266	#
267	# Check for site packages
268	#
269	AC_MSG_CHECKING([for Python site-packages path])
270	if test -z "$PYTHON_SITE_PKG"; then
271	PYTHON_SITE_PKG=`$PYTHON -c "import distutils.sysconfig; \
272	print (distutils.sysconfig.get_python_lib(0,0));"`
273	fi
274	AC_MSG_RESULT([$PYTHON_SITE_PKG])
275	AC_SUBST([PYTHON_SITE_PKG])
276
277	#
278	# libraries which must be linked in when embedding
279	#
280	AC_MSG_CHECKING(python extra libraries)
281	if test -z "$PYTHON_EXTRA_LIBS"; then
282	PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
283	conf = distutils.sysconfig.get_config_var; \
284	print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
285	fi
286	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
287	AC_SUBST(PYTHON_EXTRA_LIBS)
288
289	#
290	# linking flags needed when embedding
291	#
292	AC_MSG_CHECKING(python extra linking flags)
293	if test -z "$PYTHON_EXTRA_LDFLAGS"; then
294	PYTHON_EXTRA_LDFLAGS=`$PYTHON -c "import distutils.sysconfig; \
295	conf = distutils.sysconfig.get_config_var; \
296	print (conf('LINKFORSHARED'))"`
297	fi
298	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
299	AC_SUBST(PYTHON_EXTRA_LDFLAGS)
300
301	#
302	# final check to see if everything compiles alright
303	#
304	AC_MSG_CHECKING([consistency of all components of python development environment])
305	# save current global flags
306	ac_save_LIBS="$LIBS"
307	ac_save_LDFLAGS="$LDFLAGS"
308	ac_save_CPPFLAGS="$CPPFLAGS"
309	LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS $PYTHON_EXTRA_LIBS"
310	LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
311	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
312	AC_LANG_PUSH([C])
313	AC_LINK_IFELSE([
314	AC_LANG_PROGRAM([[#include <Python.h>]],
315	[[Py_Initialize();]])
316	],[pythonexists=yes],[pythonexists=no])
317	AC_LANG_POP([C])
318	# turn back to default flags
319	CPPFLAGS="$ac_save_CPPFLAGS"
320	LIBS="$ac_save_LIBS"
321	LDFLAGS="$ac_save_LDFLAGS"
322
323	AC_MSG_RESULT([$pythonexists])
324
325	if test ! "x$pythonexists" = "xyes"; then
326	m4_ifvaln([$2],[$2],[
327	AC_MSG_FAILURE([
328	Could not link test program to Python. Maybe the main Python library has been
329	installed in some non-standard library path. If so, pass it to configure,
330	via the LIBS environment variable.
331	Example: ./configure LIBS="-L/usr/non-standard-path/python/lib"
332	============================================================================
333	ERROR!
334	You probably have to install the development version of the Python package
335	for your distribution. The exact name of this package varies among them.
336	============================================================================
337	])
338	PYTHON_VERSION=""
339	])
340	fi
341
342	#
343	# all done!
344	#
345	])