windows build fixes

include/libtorrent/aux_/session_impl.hpp

@@ -178,7 +178,7 @@ namespace libtorrent
 
 		// this is the link between the main thread and the
 		// thread started to run the main downloader loop
-		struct session_impl: boost::noncopyable, initialize_timer
+		struct TORRENT_EXPORT session_impl: boost::noncopyable, initialize_timer
 			, boost::enable_shared_from_this<session_impl>
 		{
 

include/libtorrent/bloom_filter.hpp

@@ -66,7 +66,7 @@ namespace libtorrent
 		{
 			const int c = (std::min)(count_zero_bits(bits, N), (N * 8) - 1);
 			const int m = N * 8;
-			return ::log(c / float(m)) / (2.f * log(1.f - 1.f/m));
+			return ::log(c / float(m)) / (2.f * ::log(1.f - 1.f/m));
 		}
 
 		bloom_filter() { clear(); }

include/libtorrent/timestamp_history.hpp

@@ -34,13 +34,14 @@ POSSIBILITY OF SUCH DAMAGE.
 #define TIMESTAMP_HISTORY_HPP
 
 #include "boost/cstdint.hpp"
+#include "libtorrent/config.hpp"
 #include "libtorrent/assert.hpp"
 
 namespace libtorrent {
 
 // timestamp history keeps a history of the lowest timestamps we've
 // seen in the last 20 minutes
-struct timestamp_history
+struct TORRENT_EXPORT timestamp_history
 {
 	enum { history_size = 20 };