src/libprotobuf.map - third_party/protobuf - Git at Google

 {
   global:
     extern "C++" {
       *google*;
       pb::*;
     };
     scc_info_*;
     descriptor_table_*;

   local:
     *;
 };
	{
	global:
	extern "C++" {
	google;
	pb::*;
	};
	scc_info_*;
	descriptor_table_*;

	local:
	*;
	};