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##### http://autoconf-archive.cryp.to/ax_boost_base.html
#
# SYNOPSIS
#
#   AX_BOOST_BASE([MINIMUM-VERSION])
#
# DESCRIPTION
#
#   Test for the Boost C++ libraries of a particular version (or newer)
#
#   If no path to the installed boost library is given the macro
#   searchs under /usr, /usr/local, /opt and /opt/local and evaluates
#   the $BOOST_ROOT environment variable. Further documentation is
#   available at <http://randspringer.de/boost/index.html>.
#
#   This macro calls:
#
#     AC_SUBST(BOOST_CPPFLAGS) / AC_SUBST(BOOST_LDFLAGS)
#
#   And sets:
#
#     HAVE_BOOST
#
# LAST MODIFICATION
#
#   2007-07-28
#
# COPYLEFT
#
#   Copyright (c) 2007 Thomas Porschberg <thomas@randspringer.de>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([AX_BOOST_BASE],
[
AC_ARG_WITH([boost],
        AS_HELP_STRING([--with-boost@<:@=DIR@:>@], [use boost (default is yes) - it is possible to specify the root directory for boost (optional)]),
        [
    if test "$withval" = "no"; then
                want_boost="no"
    elif test "$withval" = "yes"; then
        want_boost="yes"
        ac_boost_path=""
    else
            want_boost="yes"
        ac_boost_path="$withval"
        fi
    ],
    [want_boost="yes"])

if test "x$want_boost" = "xyes"; then
        boost_lib_version_req=ifelse([$1], ,1.20.0,$1)
        boost_lib_version_req_shorten=`expr $boost_lib_version_req : '\([[0-9]]*\.[[0-9]]*\)'`
        boost_lib_version_req_major=`expr $boost_lib_version_req : '\([[0-9]]*\)'`
        boost_lib_version_req_minor=`expr $boost_lib_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
        boost_lib_version_req_sub_minor=`expr $boost_lib_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
        if test "x$boost_lib_version_req_sub_minor" = "x" ; then
                boost_lib_version_req_sub_minor="0"
        fi
        WANT_BOOST_VERSION=`expr $boost_lib_version_req_major \* 100000 \+  $boost_lib_version_req_minor \* 100 \+ $boost_lib_version_req_sub_minor`
        AC_MSG_CHECKING(for boostlib >= $boost_lib_version_req)
        succeeded=no

        dnl first we check the system location for boost libraries
        dnl this location ist chosen if boost libraries are installed with the --layout=system option
        dnl or if you install boost with RPM
        if test "$ac_boost_path" != ""; then
                BOOST_LDFLAGS="-L$ac_boost_path/lib"
                BOOST_CPPFLAGS="-I$ac_boost_path/include"
        else
                for ac_boost_path_tmp in /usr /usr/local /opt /opt/local ; do
                        if test -d "$ac_boost_path_tmp/include/boost" && test -r "$ac_boost_path_tmp/include/boost"; then
                                BOOST_LDFLAGS="-L$ac_boost_path_tmp/lib"
                                BOOST_CPPFLAGS="-I$ac_boost_path_tmp/include"
                                break;
                        fi
                done
        fi

        CPPFLAGS_SAVED="$CPPFLAGS"
        CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
        export CPPFLAGS

        LDFLAGS_SAVED="$LDFLAGS"
        LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
        export LDFLAGS

        AC_LANG_PUSH(C++)
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
        @%:@include <boost/version.hpp>
        ]], [[
        #if BOOST_VERSION >= $WANT_BOOST_VERSION
        // Everything is okay
        #else
        #  error Boost version is too old
        #endif
        ]])],[
        AC_MSG_RESULT(yes)
        succeeded=yes
        found_system=yes
        ],[
        ])
        AC_LANG_POP([C++])



        dnl if we found no boost with system layout we search for boost libraries
        dnl built and installed without the --layout=system option or for a staged(not installed) version
        if test "x$succeeded" != "xyes"; then
                _version=0
                if test "$ac_boost_path" != ""; then
                        BOOST_LDFLAGS="-L$ac_boost_path/lib"
                        if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
                                for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
                                        _version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
                                        V_CHECK=`expr $_version_tmp \> $_version`
                                        if test "$V_CHECK" = "1" ; then
                                                _version=$_version_tmp
                                        fi
                                        VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
                                        BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
                                done
                        fi
                else
                        for ac_boost_path in /usr /usr/local /opt /opt/local ; do
                                if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
                                        for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
                                                _version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
                                                V_CHECK=`expr $_version_tmp \> $_version`
                                                if test "$V_CHECK" = "1" ; then
                                                        _version=$_version_tmp
                                                        best_path=$ac_boost_path
                                                fi
                                        done
                                fi
                        done

                        VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
                        BOOST_CPPFLAGS="-I$best_path/include/boost-$VERSION_UNDERSCORE"
                        BOOST_LDFLAGS="-L$best_path/lib"

                        if test "x$BOOST_ROOT" != "x"; then
                                if test -d "$BOOST_ROOT" && test -r "$BOOST_ROOT" && test -d "$BOOST_ROOT/stage/lib" && test -r "$BOOST_ROOT/stage/lib"; then
                                        version_dir=`expr //$BOOST_ROOT : '.*/\(.*\)'`
                                        stage_version=`echo $version_dir | sed 's/boost_//' | sed 's/_/./g'`
                                        stage_version_shorten=`expr $stage_version : '\([[0-9]]*\.[[0-9]]*\)'`
                                        V_CHECK=`expr $stage_version_shorten \>\= $_version`
                                        if test "$V_CHECK" = "1" ; then
                                                AC_MSG_NOTICE(We will use a staged boost library from $BOOST_ROOT)
                                                BOOST_CPPFLAGS="-I$BOOST_ROOT"
                                                BOOST_LDFLAGS="-L$BOOST_ROOT/stage/lib"
                                        fi
                                fi
                        fi
                fi

                CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
                export CPPFLAGS
                LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
                export LDFLAGS

                AC_LANG_PUSH(C++)
                AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
                @%:@include <boost/version.hpp>
                ]], [[
                #if BOOST_VERSION >= $WANT_BOOST_VERSION
                // Everything is okay
                #else
                #  error Boost version is too old
                #endif
                ]])],[
                AC_MSG_RESULT(yes)
                succeeded=yes
                found_system=yes
                ],[
                ])
                AC_LANG_POP([C++])
        fi

        if test "$succeeded" != "yes" ; then
                if test "$_version" = "0" ; then
                        AC_MSG_ERROR([[We could not detect the boost libraries (version $boost_lib_version_req_shorten or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation.]])
                else
                        AC_MSG_NOTICE([Your boost libraries seems to old (version $_version).])
                fi
        else
                AC_SUBST(BOOST_CPPFLAGS)
                AC_SUBST(BOOST_LDFLAGS)
                AC_DEFINE(HAVE_BOOST,,[define if the Boost library is available])
        fi

        CPPFLAGS="$CPPFLAGS_SAVED"
        LDFLAGS="$LDFLAGS_SAVED"
fi

])