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##### http://autoconf-archive.cryp.to/ax_boost_base.html
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#
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# SYNOPSIS
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#
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#   AX_BOOST_BASE([MINIMUM-VERSION])
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#
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# DESCRIPTION
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#
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#   Test for the Boost C++ libraries of a particular version (or newer)
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#
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#   If no path to the installed boost library is given the macro
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#   searchs under /usr, /usr/local, /opt and /opt/local and evaluates
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#   the $BOOST_ROOT environment variable. Further documentation is
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#   available at <http://randspringer.de/boost/index.html>.
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#
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#   This macro calls:
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#
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#     AC_SUBST(BOOST_CPPFLAGS) / AC_SUBST(BOOST_LDFLAGS)
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#
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#   And sets:
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#
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#     HAVE_BOOST
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#
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# LAST MODIFICATION
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#
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#   2007-07-28
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#
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# COPYLEFT
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#
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#   Copyright (c) 2007 Thomas Porschberg <thomas@randspringer.de>
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#
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#   Copying and distribution of this file, with or without
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#   modification, are permitted in any medium without royalty provided
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#   the copyright notice and this notice are preserved.
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AC_DEFUN([AX_BOOST_BASE],
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[
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AC_ARG_WITH([boost],
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	AS_HELP_STRING([--with-boost@<:@=DIR@:>@], [use boost (default is yes) - it is possible to specify the root directory for boost (optional)]),
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	[
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    if test "$withval" = "no"; then
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		want_boost="no"
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    elif test "$withval" = "yes"; then
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        want_boost="yes"
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        ac_boost_path=""
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    else
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	    want_boost="yes"
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        ac_boost_path="$withval"
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	fi
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    ],
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    [want_boost="yes"])
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if test "x$want_boost" = "xyes"; then
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	boost_lib_version_req=ifelse([$1], ,1.20.0,$1)
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	boost_lib_version_req_shorten=`expr $boost_lib_version_req : '\([[0-9]]*\.[[0-9]]*\)'`
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	boost_lib_version_req_major=`expr $boost_lib_version_req : '\([[0-9]]*\)'`
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	boost_lib_version_req_minor=`expr $boost_lib_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
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	boost_lib_version_req_sub_minor=`expr $boost_lib_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
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	if test "x$boost_lib_version_req_sub_minor" = "x" ; then
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		boost_lib_version_req_sub_minor="0"
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    	fi
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	WANT_BOOST_VERSION=`expr $boost_lib_version_req_major \* 100000 \+  $boost_lib_version_req_minor \* 100 \+ $boost_lib_version_req_sub_minor`
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	AC_MSG_CHECKING(for boostlib >= $boost_lib_version_req)
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	succeeded=no
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	dnl first we check the system location for boost libraries
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	dnl this location ist chosen if boost libraries are installed with the --layout=system option
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	dnl or if you install boost with RPM
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	if test "$ac_boost_path" != ""; then
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		BOOST_LDFLAGS="-L$ac_boost_path/lib"
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		BOOST_CPPFLAGS="-I$ac_boost_path/include"
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	else
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		for ac_boost_path_tmp in /usr /usr/local /opt /opt/local ; do
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			if test -d "$ac_boost_path_tmp/include/boost" && test -r "$ac_boost_path_tmp/include/boost"; then
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				BOOST_LDFLAGS="-L$ac_boost_path_tmp/lib"
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				BOOST_CPPFLAGS="-I$ac_boost_path_tmp/include"
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				break;
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			fi
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		done
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	fi
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	CPPFLAGS_SAVED="$CPPFLAGS"
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	CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
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	export CPPFLAGS
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	LDFLAGS_SAVED="$LDFLAGS"
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	LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
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	export LDFLAGS
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	AC_LANG_PUSH(C++)
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     	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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	@%:@include <boost/version.hpp>
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	]], [[
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	#if BOOST_VERSION >= $WANT_BOOST_VERSION
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	// Everything is okay
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	#else
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	#  error Boost version is too old
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	#endif
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	]])],[
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        AC_MSG_RESULT(yes)
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	succeeded=yes
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	found_system=yes
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       	],[
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       	])
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	AC_LANG_POP([C++])
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	dnl if we found no boost with system layout we search for boost libraries
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	dnl built and installed without the --layout=system option or for a staged(not installed) version
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	if test "x$succeeded" != "xyes"; then
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		_version=0
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		if test "$ac_boost_path" != ""; then
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               		BOOST_LDFLAGS="-L$ac_boost_path/lib"
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			if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
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				for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
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					_version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
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					V_CHECK=`expr $_version_tmp \> $_version`
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					if test "$V_CHECK" = "1" ; then
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						_version=$_version_tmp
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					fi
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					VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
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					BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
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				done
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			fi
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		else
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			for ac_boost_path in /usr /usr/local /opt /opt/local ; do
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				if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
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					for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
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						_version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
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						V_CHECK=`expr $_version_tmp \> $_version`
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						if test "$V_CHECK" = "1" ; then
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							_version=$_version_tmp
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	               					best_path=$ac_boost_path
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						fi
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					done
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				fi
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			done
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			VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
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			BOOST_CPPFLAGS="-I$best_path/include/boost-$VERSION_UNDERSCORE"
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			BOOST_LDFLAGS="-L$best_path/lib"
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	    		if test "x$BOOST_ROOT" != "x"; then
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				if test -d "$BOOST_ROOT" && test -r "$BOOST_ROOT" && test -d "$BOOST_ROOT/stage/lib" && test -r "$BOOST_ROOT/stage/lib"; then
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					version_dir=`expr //$BOOST_ROOT : '.*/\(.*\)'`
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					stage_version=`echo $version_dir | sed 's/boost_//' | sed 's/_/./g'`
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			        	stage_version_shorten=`expr $stage_version : '\([[0-9]]*\.[[0-9]]*\)'`
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					V_CHECK=`expr $stage_version_shorten \>\= $_version`
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				        if test "$V_CHECK" = "1" ; then
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						AC_MSG_NOTICE(We will use a staged boost library from $BOOST_ROOT)
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						BOOST_CPPFLAGS="-I$BOOST_ROOT"
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						BOOST_LDFLAGS="-L$BOOST_ROOT/stage/lib"
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					fi
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				fi
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	    		fi
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		fi
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		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
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		export CPPFLAGS
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		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
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		export LDFLAGS
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		AC_LANG_PUSH(C++)
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	     	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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		@%:@include <boost/version.hpp>
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		]], [[
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		#if BOOST_VERSION >= $WANT_BOOST_VERSION
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		// Everything is okay
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		#else
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		#  error Boost version is too old
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		#endif
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		]])],[
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        	AC_MSG_RESULT(yes)
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		succeeded=yes
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		found_system=yes
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       		],[
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	       	])
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		AC_LANG_POP([C++])
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	fi
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	if test "$succeeded" != "yes" ; then
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		if test "$_version" = "0" ; then
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			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.]])
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		else
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			AC_MSG_NOTICE([Your boost libraries seems to old (version $_version).])
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		fi
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	else
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		AC_SUBST(BOOST_CPPFLAGS)
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		AC_SUBST(BOOST_LDFLAGS)
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		AC_DEFINE(HAVE_BOOST,,[define if the Boost library is available])
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	fi
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        CPPFLAGS="$CPPFLAGS_SAVED"
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       	LDFLAGS="$LDFLAGS_SAVED"
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fi
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])