##### 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, and /opt, 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

#

#   2006-12-28

#

# COPYLEFT

#

#   Copyright (c) 2006 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 No) - 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 ; 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 ; 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

])