Protocol Buffers 30.0

What's new in this version:

Announcements:
This version includes breaking changes to: Objective-C, Python, C++:
- [Objective-C] Remove legacy WKT headers
- [Objective-C] Remove deprecated apis
- [Objective-C] Remove support for older generated code
- [Objective-C] Remove GPBUnknownFieldSet
- [Python] Fix closed enum validation under editions
- [Python] Remove deprecated GetDebugString() from protobuf python cpp extension
- [Python] Remove deprecated reflection methods
- [Python] Remove deprecated GetPrototype MessageFactory.GetPrototype()
- [Python] Python nested message class qualname now contains the outer message name
- [Python] Remove deprecated Python RPC Service Interfaces (5ba74b1)
- [Python] Python setdefault behavior change for map field
- [Python] Remove deprecated py_proto_library macro.
- [C++] Prohibit using Bazel+MSVC to build protobuf
- [C++] Remove deprecated Arena::CreateMessage
- [C++] Remove CMake submodule support in favor of fetched or installed dependencies
- [C++] Flip default behavior for handling cmake dependencies
- [C++] Add ASAN poisoning after clearing oneof messages on arena
- [C++] Upgrade return type of type_name() and cpp_type_name() from const char* to absl::string_view
- [C++] Remove deprecated RepeatedPtrField::ClearedCount()
- [C++] Upgrade return type of several string returning functions to absl::string_view
- [C++] Strip ctype from options in C++
- [C++] Remove MutableRepeatedFieldRef::Reserve() in reflection
- [C++] Remove deprecated JsonOptions alias
- [C++] Remove deprecated Arena::GetArena
- Protobuf News may include additional announcements or pre-announcements for upcoming changes
- Migration Guide will include migration guides for breaking changes (to be updated shortly)

Bazel:
- Remove reference to cc_proto_aspect
- Remove deprecated bazel/system_python.bzl alias

Compiler:
- Add notices.h with information about our dependencies' licenses and add --notices flag to protoc to print the contents of that file
- Have the protoc CLI properly report any parser warnings
- Split protoc apart from libprotoc in our cmake configs
- Begin adding extension numbers to SourceCodeInfo and FileDescriptorSet for tooling purposes
- Fix various unsigned to signed comparison warnings

C++:
- Fixing staleness tests
- Add notices.h with information about our dependencies' licenses and add --notices flag to protoc to print the contents of that file
- Backport: Remove if_constexpr usage for future Abseil compatibility
- Add tests for older gcc versions we still support
- Fix a bug in handling of implicit-presence string_view fields
- Remove rules_rust dependency from MODULE.bazel for 30.x
- Upgrade abseil-cpp to 20250127 and use @com_google_absl -> @abseil-cpp and com_google_googletest -> @googletest canonical BCR names
- Replace std::any with a custom solution
- Make DebugString print debug output, enable debug markers for debug output
- Fix missing port_undef
- Use __builtin_expect_with_probability for proto field presence checks
- Enable meta-tagging for redaction purposes
- Breaking change: Prohibit using Bazel+MSVC to build protobuf
- Breaking change: Upgrade return type of several string returning functions to absl::string_view
- Print the presence probability when analysis is enabled
- Split protoc apart from libprotoc in our cmake configs
- Breaking change: Strip ctype from options in C++
- Breaking change: Remove MutableRepeatedFieldRef::Reserve() in reflection
- Remove stale references to C++14
- Breaking change: Upgrade return type of type_name() and cpp_type_name() from const char* to absl::string_view
- Update cmake minimum version to >=3.16
- Migrate coded output stream arguments from const std::string& to absl::string_view
- Breaking change: Remove deprecated Arena::GetArena
- Remove the time (or time-based) entropy being added to Map's seed
- Don't use CLOCK_UPTIME_RAW if it won't be defined
- Fix DEPENDENCIES in protobuf_generate() to accept multiple values instead of silently dropping
- Use ABSL_PREDICT_TRUE|FALSE instead of PROTOBUF_PREDICT_TRUE|FALSE
- Breaking change: Flip default behavior for handling cmake dependencies
- Use [[maybe_unused]] instead of PROTOBUF_UNUSED
- Use [[nodiscard]] instead of PROTOBUF_NODISCARD
- Breaking change: Remove deprecated JsonOptions alias
- Generate internal hasbits for singular proto3 implicit presence fields
- Add name mangling to nested names that collide with known generated names, like
- Breaking change: Remove deprecated RepeatedPtrField::ClearedCount()
- Breaking change: Add ASAN poisoning after clearing oneof messages on arena
- Breaking change: Remove deprecated Arena::CreateMessage
- Change DynamicCastMessage to throw a std::bad_cast exception when exceptions
- Fixed a missing check in wire format verification
- Comment change: clarifies that the field/value order is based on textual order in the file, not the order of the enums
- Bump minimum C++ version to C++17 after branch cut for v29
- Bump abseil dependency version from 20230802.1 to 20240722.0
- Breaking change: Remove CMake submodule support in favor of fetched or installed dependencies
- Support fetching CMake dependencies via -Dprotobuf_FETCH_DEPENDENCIES=ON
- Avoid field id comparisons in ExtensionSet serialization in case of single range
- Let ArenaStringPtr debug-fail if it ever attempts to clear a default string
- Fix various unsigned to signed comparison warnings
- Remove Protobuf-C++.podspec release

Java:
- Split maven dependencies into dev vs local
- Refactor TextFormat.Printer.MapEntryAdapter to handle more entry types. This will properly sort map keys for DynamicMessage maps
- Re-Expose UnderscoresToCapitalizedCamelCase for plugins in OSS
- Upgrade return type of several string returning functions to absl::string_view
- Fix mishandling of open enum + explicit presence fields
- Disable useShortRepeatedPrimitives for Printer.DEFAULT_DEBUG_FORMAT
- Optimize Java gencode version validation
- Make Java consistently reject unmatched end-group tag
- Make Java-lite reject unmatched end-group tag
- Fix handling of implicit field presence in mergeFrom to match the behavior in other places
- Use ABSL_PREDICT_TRUE|FALSE instead of PROTOBUF_PREDICT_TRUE|FALSE
- Use [[maybe_unused]] instead of PROTOBUF_UNUSED
- Remove deprecation warnings for Timestamp and Duration add/subtract/between that we do not yet have alternatives to
- Add support to print repeated fields with primitive values using short notation
- Fix unexpected NumberFormatException in Durations.parse() by replacing with documented thrown ParseException
- Give Kotlin jars an OSGi Manifest
- Lite: Remove intermediary dynamicMethod function trampolines
- Speed up SingleFieldBuilder.getBuilder() by avoiding reloading this.builder at return
- Restore runtime compatibility with 3.22.x gencode by re-adding the mutableCopy(list) methods
- CodedOutputStream: Avoid updating position to go beyond end of array
- Fix various unsigned to signed comparison warnings
- Throw more informative OutOfSpaceExceptions when we run out of space serializing a proto

Kotlin:
- Give Kotlin jars an OSGi Manifest

Csharp:
- Throw InvalidProtocolBufferException when parsing invalid UTF-8 in C#

Objective-C:
- Generate Kythe annotations for objc messages
- Update minimum supported macOS 11
- Breaking change: [ObjC] Remove legacy WKT headers
- [ObjC] Breaking Change: Remove deprecated apis
- [ObjC] Breaking Change: Remove support for older generated code
- [ObjC] Breaking Change: Remove GPBUnknownFieldSet

Python:
- Fix missing port_undef
- Python protobuf: kwargs initialization now allows dict() for proto map values
- Python: Improve refleak checker for Python 3.12
- Rename bazel "pip_deps" hub_name
- Add has_options to ServiceDescriptor and MethodDescriptor in UPB python and cpp python to match with other descriptors and pure python
- Nextgen Proto Pythonic API: Add byte_size(), clear_message() and clear_field() APIs in proto module
- Nextgen Proto Pythonic API: “Add-on” proto for Text Format serialize/parse
- Fix bug that DiscardUnknownFields did not discard unknown fields of extensions in Py-upb and Php-upb and ruby-upb
- Remove the entire pb_unit_tests/ directory with reflection_test_wrapper
- Performance optimization for upb python extend repeated scalars
- Ensure protobuf Message.dir returns proto fields
- Breaking change: Fix closed enum validation under editions
- Make python text-format reject octal floats
- Treat -0.0 as consistently distinct from 0.0 in pure python
- Remove decoder.SkipField
- Make Pure Python reject unmatched end-group tag in unknown fields
- Make Python/C++ reject unmatched end-group tag
- Override protobuf Message.dir method
- Add "absl::StatusOr GetConstMessagePointer(PyObject* msg)" in proto_api which works with cpp extension, upb and pure python
- Fix a python bug that UPB and Python C++ extension assume MessageSet extensions are ordered first
- Drop Python 3.8 support
- Fix a python bug for text_format pretty print when Struct in Any
- Support tuples when parsing JSON dicts
- Breaking change: Python nested message class qualname now contains the outer message name
- Breaking change: Python setdefault behavior change for map field
- Fix a Python bug: when package is empty, DescriptorDatabase FindFileContainingSymbol method will able to find symbol names not start with '.'
- Use ABSL_PREDICT_TRUE|FALSE instead of PROTOBUF_PREDICT_TRUE|FALSE
- Breaking change: Remove deprecated GetPrototype MessageFactory.GetPrototype(),
- Breaking change: Remove deprecated GetDebugString() from protobuf python cpp extension
- Add Python 3.13 test coverage
- Fix a python bug when assign an empty Struct at creation
- Add "PythonMessageMutator GetClearedMutableMessage(PyObject *);" in proto_api which works with cpp extension, upb and pure python
- Breaking change: Remove deprecated reflection methods
- Breaking change: Remove deprecated Python RPC Service Interfaces
- Fix pyi generation for messages with a field named "self"
- Breaking change: Remove deprecated py_proto_library macro

PHP:
- Handle optional fields correctly in Message_get method
- Delete long-deprecated internal descriptor.proto gencode forwards

PHP C-Extension:
- Upb: Update _upb_map_next signature to return a boolean and remove the _nextmutable Map iterator API
- Add to_proto to descriptor classes
- Fix bug that DiscardUnknownFields did not discard unknown fields of extensions in Py-upb and Php-upb and ruby-upb
- Raise ParseError for non-numeric strings in numeric fields in Ruby and PHP JSON parsing
- Handle optional fields correctly in Message_get method
- See also UPB changes below, which may affect PHP C-Extension

Ruby:
- Add to_proto to descriptor classes
- Support ruby 3.4
- Add a multi-platform Gemfile.lock
- Fix ruby has_...? method
- Raise ParseError for non-numeric strings in numeric fields in Ruby and PHP JSON parsing
- Error if assigning a "UTF-8" string with invalid UTF-8
- Third_party/utf8_range: support arm neon

Ruby C-Extension:
- Upb: Update _upb_map_next signature to return a boolean and remove the _nextmutable Map iterator API
- Add to_proto to descriptor classes
- Ruby: make it possible to specify compiler for C extension
- Fix bug that DiscardUnknownFields did not discard unknown fields of extensions in Py-upb and Php-upb and ruby-upb
- Fix ruby has_...? method
- Raise ParseError for non-numeric strings in numeric fields in Ruby and PHP JSON parsing
- Error if assigning a "UTF-8" string with invalid UTF-8
- Update minimum supported macOS 11
- See also UPB changes below, which may affect Ruby C-Extension

UPB (Python/PHP/Ruby C-Extension):
- Upb: Update _upb_map_next signature to return a boolean and remove the _nextmutable Map iterator API
- Change upb C generated map iteration function to not hand out MapEntry pointers
- Add to_proto to descriptor classes
- Randomize upb's map ordering
- Fix bug that DiscardUnknownFields did not discard unknown fields of extensions in Py-upb and Php-upb and ruby-upb
- Add three conformance test edge cases for ProtoJSON repr of Any
- Fix issue where a tmp buffer could have been too small when handling a serialized FeatureSet
- Fixed comparison of empty repeated/map extensions
- Fix a python bug that UPB and Python C++ extension assume MessageSet extensions are ordered first

Other:
- Remove test platform specification from release config
- Remove reference to rules_rust from .bazelrc
- Protobuf: add //:go_features_proto Bazel alias
- Move to bazel 7 and turn down support for bazel 6
- Upgrade minimum version of macOS support to macOS 10.15 (Catalina)
- Update protoc release to include editions language features proto for Go
- Bazel 8 compatibility for Bazel users, however building test and release targets from source is not compatible with Bazel 8 yet