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dnl PAC_CHECK_PYTHON check for python 3, sets PYTHON variable or abort
dnl
AC_DEFUN([PAC_CHECK_PYTHON],[
AC_ARG_VAR([PYTHON], [set to Python 3])
python_one_liner="import sys; print(sys.version_info[[0]])"
if test -z "$PYTHON" ; then
PYTHON=
dnl check command 'python'
PYTHON_PATH=
AC_PATH_PROG(PYTHON_PATH, python)
if test "x$PYTHON_PATH" != x ; then
py_version=`$PYTHON_PATH -c "$python_one_liner"`
if test "x$py_version" = x3 ; then
PYTHON=$PYTHON_PATH
fi
fi
dnl PYTHON is still not set, check command 'python3'
if test "x$PYTHON" = x ; then
PYTHON3_PATH=
AC_PATH_PROG(PYTHON3_PATH, python3)
if test "x$PYTHON3_PATH" != x ; then
py3_version=`$PYTHON3_PATH -c "$python_one_liner"`
if test "x$py3_version" = x3 ; then
PYTHON=$PYTHON3_PATH
fi
fi
fi
if test -z "$PYTHON" ; then
AC_MSG_WARN([Python version 3 not found! Bindings need to be generated before configure.])
else
AC_MSG_NOTICE([Python version 3 is $PYTHON])
fi
else
py_version=`$PYTHON -c "$python_one_liner"`
if test "x$py_version" != x3 ; then
AC_MSG_ERROR([PYTHON=$PYTHON is not a Python 3 interpreter])
fi
fi
])
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