doc/configure.ac: simplify python check

A check for python binary that was originally introduced by commit
183e869 is needed because python is used for a couple of preprocessors
(doxygen-link.py and resolve-asciidoc-refs.py) and therefore it is
impossible to build docs without python.

While it is right to check for python, the check was both wrong and
excessive. Instead of just checking for python binary, it checked for
various versions of python and set a few variables that are not needed
here. More to say, the absense of python binary was not treated as
being fatal like it should.

Fix both problems by using AC_CHECK_PROG for python, terminating the
build in the same way as with doxygen absense. Also, remove the
m4/ax_python.m4 which is no longer needed.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>

2 files changed, 5 insertions, 101 deletions

diff --git a/doc/configure.ac b/doc/configure.ac
index d243061d..2e575701 100644
--- a/doc/configure.ac
+++ b/doc/configure.ac
@@ -15,8 +15,6 @@ AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([foreign])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)], [])
 
-m4_include([m4/ax_python.m4])
-
 #
 # Generating the documentation
 #
@@ -24,12 +22,15 @@ AC_ARG_ENABLE([doc],
 	      AS_HELP_STRING([--disable-doc], [Do not generate documentation]),
 	      [generate_doc="$enableval"], [generate_doc=auto])
 
-AX_PYTHON
-
 if test "x$generate_doc" != "xno"; then
 	AC_PROG_SED
 	AC_PROG_EGREP
 
+	AC_CHECK_PROG(HAVE_PYTHON, [python], yes, no)
+	if test "x$HAVE_PYTHON" = "xno"  -a "x$generate_doc" = "xyes"; then
+		AC_MSG_ERROR([*** python binary required to generate documentation])
+	fi
+
 	AC_CHECK_PROG(HAVE_DOXYGEN, [doxygen], yes, no)
 	if test "x$HAVE_DOXYGEN" = "xno" -a "x$generate_doc" = "xyes"; then
 		AC_MSG_ERROR([*** doxygen package required to generate documentation])
diff --git a/doc/m4/ax_python.m4 b/doc/m4/ax_python.m4
deleted file mode 100644
index f9a51359..00000000
--- a/doc/m4/ax_python.m4
+++ /dev/null
@@ -1,97 +0,0 @@
-# ===========================================================================
-#         http://www.gnu.org/software/autoconf-archive/ax_python.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_PYTHON
-#
-# DESCRIPTION
-#
-#   This macro does a complete Python development environment check.
-#
-#   It recurses through several python versions (from 2.1 to 2.6 in this
-#   version), looking for an executable. 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 <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 9
-
-AC_DEFUN([AX_PYTHON],
-[AC_MSG_CHECKING(for python build information)
-AC_MSG_RESULT([])
-for python in 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=$ax_python_bin, ax_python_lib=no)
-   AC_CHECK_HEADER([$ax_python_bin/Python.h],
-   [[ax_python_header=`locate $ax_python_bin/Python.h | sed -e s,/Python.h,,`]],
-   ax_python_header=no)
-   if test x$ax_python_lib != xno; then
-     if test x$ax_python_header != xno; then
-       break;
-     fi
-   fi
-fi
-done
-if test x$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