m4: fix Python 3.13/3.14 detection and empty version string crash

.gitignore

@@ -21,6 +21,9 @@ Makefile.in
 /ltmain.sh
 /missing
 /m4/*.m4
+!/m4/ax_python.m4
+!/m4/ax_python_devel.m4
+!/m4/ax_boost_python.m4
 /po/
 /intl/
 

m4/ax_boost_python.m4

@@ -0,0 +1,121 @@
+# ===========================================================================
+#     https://www.gnu.org/software/autoconf-archive/ax_boost_python.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_BOOST_PYTHON
+#
+# DESCRIPTION
+#
+#   This macro checks to see if the Boost.Python library is installed. It
+#   also attempts to guess the correct library name using several attempts.
+#   It tries to build the library name using a user supplied name or suffix
+#   and then just the raw library.
+#
+#   If the library is found, HAVE_BOOST_PYTHON is defined and
+#   BOOST_PYTHON_LIB is set to the name of the library.
+#
+#   This macro calls AC_SUBST(BOOST_PYTHON_LIB).
+#
+#   In order to ensure that the Python headers and the Boost libraries are
+#   specified on the include path, this macro requires AX_PYTHON_DEVEL and
+#   AX_BOOST_BASE to be called.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Michael Tindal
+#   Copyright (c) 2013 Daniel M"ullner <daniel@danifold.net>
+#
+#   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 2 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 23
+
+AC_DEFUN([AX_BOOST_PYTHON],
+[AC_REQUIRE([AX_PYTHON_DEVEL])dnl
+AC_REQUIRE([AX_BOOST_BASE])dnl
+AC_LANG_PUSH([C++])
+ax_boost_python_save_CPPFLAGS="$CPPFLAGS"
+ax_boost_python_save_LDFLAGS="$LDFLAGS"
+ax_boost_python_save_LIBS="$LIBS"
+if test "x$PYTHON_CPPFLAGS" != "x"; then
+  CPPFLAGS="$PYTHON_CPPFLAGS $CPPFLAGS"
+fi
+
+# Versions of AX_PYTHON_DEVEL() before serial 18 provided PYTHON_LDFLAGS
+# instead of PYTHON_LIBS, so this is just here for compatibility.
+if test "x$PYTHON_LDFLAGS" != "x"; then
+  LDFLAGS="$PYTHON_LDFLAGS $LDFLAGS"
+fi
+
+# Note: Only versions of AX_PYTHON_DEVEL() since serial 18 provide PYTHON_LIBS
+# instead of PYTHON_LDFLAGS.
+if test "x$PYTHON_LIBS" != "x"; then
+  LIBS="$PYTHON_LIBS $LIBS"
+fi
+
+if test "x$BOOST_CPPFLAGS" != "x"; then
+  CPPFLAGS="$BOOST_CPPFLAGS $CPPFLAGS"
+fi
+if test "x$BOOST_LDFLAGS" != "x"; then
+  LDFLAGS="$BOOST_LDFLAGS $LDFLAGS"
+fi
+AC_CACHE_CHECK(whether the Boost::Python library is available,
+ac_cv_boost_python,
+[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#include <boost/python/module.hpp>
+BOOST_PYTHON_MODULE(test) { throw "Boost::Python test."; }]], [])],
+    ac_cv_boost_python=yes, ac_cv_boost_python=no)
+])
+if test "$ac_cv_boost_python" = "yes"; then
+  AC_DEFINE(HAVE_BOOST_PYTHON,,[define if the Boost::Python library is available])
+  ax_python_lib=boost_python
+  AC_ARG_WITH([boost-python],AS_HELP_STRING([--with-boost-python],[specify yes/no or the boost python library or suffix to use]),
+  [if test "x$with_boost_python" != "xno" -a "x$with_boost_python" != "xyes"; then
+     ax_python_lib=$with_boost_python
+     ax_boost_python_lib=boost_python-$with_boost_python
+   fi])
+  BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
+  for ax_lib in $ax_python_lib $ax_boost_python_lib `ls $BOOSTLIBDIR/libboost_python*.so* $BOOSTLIBDIR/libboost_python*.dylib* $BOOSTLIBDIR/libboost_python*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_python.*\)\.so.*$;\1;' -e 's;^lib\(boost_python.*\)\.dylib.*$;\1;' -e 's;^lib\(boost_python.*\)\.a.*$;\1;' ` boost_python boost_python3; do
+    AS_VAR_PUSHDEF([ax_Lib], [ax_cv_lib_$ax_lib''_BOOST_PYTHON_MODULE])dnl
+    AC_CACHE_CHECK([whether $ax_lib is the correct library], [ax_Lib],
+    [LIBS="-l$ax_lib $ax_boost_python_save_LIBS $PYTHON_LIBS"
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <boost/python/module.hpp>
+BOOST_PYTHON_MODULE(test) { throw "Boost::Python test."; }]], [])],
+        [AS_VAR_SET([ax_Lib], [yes])],
+        [AS_VAR_SET([ax_Lib], [no])])])
+    AS_VAR_IF([ax_Lib], [yes], [BOOST_PYTHON_LIB=-l$ax_lib break], [])
+    AS_VAR_POPDEF([ax_Lib])dnl
+  done
+  AC_SUBST(BOOST_PYTHON_LIB)
+fi
+CPPFLAGS="$ax_boost_python_save_CPPFLAGS"
+LDFLAGS="$ax_boost_python_save_LDFLAGS"
+LIBS="$ax_boost_python_save_LIBS"
+AC_LANG_POP([C++])
+])dnl

m4/ax_python.m4

@@ -0,0 +1,97 @@
+# ===========================================================================
+#        https://www.gnu.org/software/autoconf-archive/ax_python.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PYTHON
+#
+# DESCRIPTION
+#
+#   This macro does a complete Python development environment check.
+#
+#   It checks for all known versions. When it finds an executable, it looks
+#   to find the header files and library.
+#
+#   It sets PYTHON_BIN to the name of the python executable,
+#   PYTHON_INCLUDE_DIR to the directory holding the header files, and
+#   PYTHON_LIB to the name of the Python library.
+#
+#   This macro calls AC_SUBST on PYTHON_BIN (via AC_CHECK_PROG),
+#   PYTHON_INCLUDE_DIR and PYTHON_LIB.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Michael Tindal
+#
+#   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 2 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 20
+
+AC_DEFUN([AX_PYTHON],
+[AC_MSG_CHECKING(for python build information)
+AC_MSG_RESULT([])
+for python in python3.14 python3.13 python3.12 python3.11 python3.10 python3.9 python3.8 python3.7 python3.6 python3.5 python3.4 python3.3 python3.2 python3.1 python3.0 python2.7 python2.6 python2.5 python2.4 python2.3 python2.2 python2.1 python; do
+AC_CHECK_PROGS(PYTHON_BIN, [$python])
+ax_python_bin=$PYTHON_BIN
+if test x$ax_python_bin != x; then
+   AC_CHECK_LIB($ax_python_bin, main, ax_python_lib=$ax_python_bin, ax_python_lib=no)
+   if test x$ax_python_lib == xno; then
+     AC_CHECK_LIB(${ax_python_bin}m, main, ax_python_lib=${ax_python_bin}m, ax_python_lib=no)
+   fi
+   if test x$ax_python_lib != xno; then
+     ax_python_header=`$ax_python_bin -c "import sysconfig; print(sysconfig.get_config_var('CONFINCLUDEPY') or sysconfig.get_path('include'))"`
+     if test x$ax_python_header != x; then
+       break;
+     fi
+   fi
+fi
+done
+if test x$ax_python_bin = x; then
+   ax_python_bin=no
+fi
+if test x$ax_python_header = x; then
+   ax_python_header=no
+fi
+if test x$ax_python_lib = x; then
+   ax_python_lib=no
+fi
+
+AC_MSG_RESULT([  results of the Python check:])
+AC_MSG_RESULT([    Binary:      $ax_python_bin])
+AC_MSG_RESULT([    Library:     $ax_python_lib])
+AC_MSG_RESULT([    Include Dir: $ax_python_header])
+
+if test x$ax_python_header != xno; then
+  PYTHON_INCLUDE_DIR=$ax_python_header
+  AC_SUBST(PYTHON_INCLUDE_DIR)
+fi
+if test x$ax_python_lib != xno; then
+  PYTHON_LIB=$ax_python_lib
+  AC_SUBST(PYTHON_LIB)
+fi
+])dnl