Update m4 files from autoconf-archive

Keep changed site-path for python packages to arch dependent path.

ax_pkg_swig.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#        http://www.gnu.org/software/autoconf-archive/ax_pkg_swig.html
+#       https://www.gnu.org/software/autoconf-archive/ax_pkg_swig.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -32,9 +32,9 @@
 # LICENSE
 #
 #   Copyright (c) 2008 Sebastian Huber <[email protected]>
-#   Copyright (c) 2008 Alan W. Irwin <[email protected]>
+#   Copyright (c) 2008 Alan W. Irwin
 #   Copyright (c) 2008 Rafael Laboissiere <[email protected]>
-#   Copyright (c) 2008 Andrew Collier <[email protected]>
+#   Copyright (c) 2008 Andrew Collier
 #   Copyright (c) 2011 Murray Cumming <[email protected]>
 #
 #   This program is free software; you can redistribute it and/or modify it
@@ -48,7 +48,7 @@
 #   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/>.
+#   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
@@ -63,11 +63,11 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 8
+#serial 13
 
 AC_DEFUN([AX_PKG_SWIG],[
-        # Ubuntu has swig 2.0 as /usr/bin/swig2.0
-        AC_PATH_PROGS([SWIG],[swig2.0 swig])
+        # Find path to the "swig" executable.
+        AC_PATH_PROGS([SWIG],[swig swig3.0 swig2.0])
         if test -z "$SWIG" ; then
                 m4_ifval([$3],[$3],[:])
         elif test -n "$1" ; then

ax_python_devel.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_python_devel.html
+#     https://www.gnu.org/software/autoconf-archive/ax_python_devel.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -12,8 +12,8 @@
 #   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.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
@@ -52,7 +52,7 @@
 #   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/>.
+#   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
@@ -67,7 +67,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 16
+#serial 21
 
 AU_ALIAS([AC_PYTHON_DEVEL], [AX_PYTHON_DEVEL])
 AC_DEFUN([AX_PYTHON_DEVEL],[
@@ -99,7 +99,7 @@ AC_DEFUN([AX_PYTHON_DEVEL],[
 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,
+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.
@@ -137,7 +137,7 @@ variable to configure. See ``configure --help'' for reference.
 	#
 	AC_MSG_CHECKING([for the distutils Python package])
 	ac_distutils_result=`$PYTHON -c "import distutils" 2>&1`
-	if test -z "$ac_distutils_result"; then
+	if test $? -eq 0; then
 		AC_MSG_RESULT([yes])
 	else
 		AC_MSG_RESULT([no])
@@ -172,7 +172,7 @@ $ac_distutils_result])
 	# Check for Python library path
 	#
 	AC_MSG_CHECKING([for Python library path])
-	if test -z "$PYTHON_LDFLAGS"; then
+	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 | $PYTHON -
@@ -227,25 +227,25 @@ EOD`
 		then
 			# use the official shared library
 			ac_python_library=`echo "$ac_python_library" | sed "s/^lib//"`
-			PYTHON_LDFLAGS="-L$ac_python_libdir -l$ac_python_library"
+			PYTHON_LIBS="-L$ac_python_libdir -l$ac_python_library"
 		else
 			# old way: use libpython from python_configdir
 			ac_python_libdir=`$PYTHON -c \
 			  "from distutils.sysconfig import get_python_lib as f; \
 			  import os; \
 			  print (os.path.join(f(plat_specific=1, standard_lib=1), 'config'));"`
-			PYTHON_LDFLAGS="-L$ac_python_libdir -lpython$ac_python_version"
+			PYTHON_LIBS="-L$ac_python_libdir -lpython$ac_python_version"
 		fi
 
-		if test -z "PYTHON_LDFLAGS"; then
+		if test -z "PYTHON_LIBS"; 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.
+  dynamic libraries enabled, or try setting PYTHON_LIBS by hand.
 			])
 		fi
 	fi
-	AC_MSG_RESULT([$PYTHON_LDFLAGS])
-	AC_SUBST([PYTHON_LDFLAGS])
+	AC_MSG_RESULT([$PYTHON_LIBS])
+	AC_SUBST([PYTHON_LIBS])
 
 	#
 	# Check for site packages
@@ -265,7 +265,7 @@ EOD`
 	if test -z "$PYTHON_EXTRA_LIBS"; then
 	   PYTHON_EXTRA_LIBS=`$PYTHON -c "import distutils.sysconfig; \
                 conf = distutils.sysconfig.get_config_var; \
-                print (conf('LIBS'))"`
+                print (conf('LIBS') + ' ' + conf('SYSLIBS'))"`
 	fi
 	AC_MSG_RESULT([$PYTHON_EXTRA_LIBS])
 	AC_SUBST(PYTHON_EXTRA_LIBS)
@@ -288,8 +288,10 @@ EOD`
 	AC_MSG_CHECKING([consistency of all components of python development environment])
 	# save current global flags
 	ac_save_LIBS="$LIBS"
+	ac_save_LDFLAGS="$LDFLAGS"
 	ac_save_CPPFLAGS="$CPPFLAGS"
-	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS $PYTHON_EXTRA_LDFLAGS $PYTHON_EXTRA_LIBS"
+	LIBS="$ac_save_LIBS $PYTHON_LIBS $PYTHON_EXTRA_LIBS $PYTHON_EXTRA_LIBS"
+	LDFLAGS="$ac_save_LDFLAGS $PYTHON_EXTRA_LDFLAGS"
 	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
 	AC_LANG_PUSH([C])
 	AC_LINK_IFELSE([
@@ -300,15 +302,16 @@ EOD`
 	# turn back to default flags
 	CPPFLAGS="$ac_save_CPPFLAGS"
 	LIBS="$ac_save_LIBS"
+	LDFLAGS="$ac_save_LDFLAGS"
 
 	AC_MSG_RESULT([$pythonexists])
 
         if test ! "x$pythonexists" = "xyes"; then
 	   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 LDFLAGS environment variable.
-  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"
+  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

m4/ax_config_feature.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_config_feature.html
+#    https://www.gnu.org/software/autoconf-archive/ax_config_feature.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -73,7 +73,7 @@
 #   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/>.
+#   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
@@ -88,7 +88,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 10
+#serial 11
 
 AC_DEFUN([AX_CONFIG_FEATURE],[ dnl
 m4_pushdef([FEATURE], patsubst([$1], -, _))dnl

m4/ax_have_poll.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_have_poll.html
+#       https://www.gnu.org/software/autoconf-archive/ax_have_poll.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -34,7 +34,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 7
+#serial 8
 
 AC_DEFUN([AX_HAVE_POLL], [dnl
   AC_MSG_CHECKING([for poll(2)])