Protocol Buffers v3.18.0 C++ Fix warnings raised by clang 11 Make StringPiece constructible from std::string_view Add missing capability attributes for LLVM 12 Stop using std::iterator (deprecated in C++17). Move field_access_listener from libprotobuf-lite to libprotobuf Fix 7047 Safely handle setlocale Remove deprecated version of SetTotalBytesLimit() Support arena allocation of google::protobuf::AnyMetadata Fix undefined symbol error around SharedCtor() Fix default value of enum(int) in json_util with proto2 Better Smaller ByteSizeLong Introduce event filters for inject_field_listener_events Reduce memory usage of DescriptorPool For lazy fields copy serialized form when allowed. Re-introduce the InlinedStringField class v2 access listener Reduce padding in the proto's ExtensionRegistry map. GetExtension performance optimizations Make tracker a static variable rather than call static functions Support extensions in field access listener Annotate MergeFrom for field access listener Fix incomplete types for field access listener Add map_entry/new_map_entry to SpecificField in MessageDifferencer. They record the map items which are different in MessageDifferencer's reporter. Reduce binary size due to fieldless proto messages TextFormat: ParseInfoTree supports getting field end location in addition to start. Fix repeated enum extension size in field listener Enable Any Text Expansion for Descriptors::DebugString() Switch from int{8,16,32,64} to int{8,16,32,64}_t Python Drops support for 2.7 and 3.5.