# ===========================================================================

#      http://www.gnu.org/software/autoconf-archive/ax_python_devel.html

# ===========================================================================

#

# SYNOPSIS

#

#   AX_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.

#

# 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>

#

#   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 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 17

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

	   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 $1)"`

		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

	#

	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_LDFLAGS"; then

		# (makes two attempts to ensure we've got a version number

		# from the interpreter)

		ac_python_version=`cat<

# 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

		# JW: We don't need it and it interferes with the hack

		# to detect multiple Pyhton versions

		#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<

# 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<

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_LDFLAGS="-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_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"

		fi

		if test -z "PYTHON_LDFLAGS"; then

			AC_MSG_ERROR([

  Cannot determine location of your Python DSO. Please check it was installed with

  dynamic libraries enabled, or try setting PYTHON_LDFLAGS by hand.

			])

		fi

	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('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_CPPFLAGS="$CPPFLAGS"

	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"

	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"

	AC_MSG_RESULT([$pythonexists])

        if test ! "x$pythonexists" = "xyes"; then

	   AC_MSG_WARN([

  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"

  ============================================================================

   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!

	#

])