protobuf-31.0

[Bruce Dubbs]

New major version.

[Xi Ruoyao]

It looks like we'll have to remove -D protobuf_BUILD_LIBUPB=OFF (and install a useless static library) or it FTBFS :(.

[Bruce Dubbs]

Protocol Buffers v31.0

Announcements

• Protobuf News may include additional announcements or pre-announcements for upcoming changes.

Bazel

• Loosen py_proto_library check to be on the import path instead of full directory (i.e. excluding external/module-name prefix).

Compiler

• Add support for import option for protoc.
• Add notices.h with information about our dependencies' licenses and add --notices flag to protoc to print the contents of that file.
• Move upb minitable code generator into protoc
• Upgrade abseil-cpp to 20250127 and use @com_google_absl -> @abseil-cpp and com_google_googletest -> @googletest canonical BCR names.

C++

• Remove fast-path check for non-clang compilers in MessageCreator.
• Add missing include.
• Add weak attribute to GetClassData to speed up clang builds.
• Add nontemporal software prefetcher to repeated ptr field dtor to improve performance.
• Warn on unused RepeatedPtrField.
• Add notices.h with information about our dependencies' licenses and add --notices flag to protoc to print the contents of that file.
• Fix a bug in handling of implicit-presence string_view fields.
• Control bounds checks via BUILD flags.
• Upgrade abseil-cpp to 20250127 and use @com_google_absl -> @abseil-cpp and com_google_googletest -> @googletest canonical BCR names.
• Create hardened versions of Get and Mutable for repeated_field.

Java

• Add weak attribute to GetClassData to speed up clang builds.
• Use ProtobufToStringOutput to control the output format of AbstractMessage.Builder.toString.
• Implement Protobuf Java Immutable API nest_in_file_class feature for Edition 2024.
• Introduce a Generated annotation to eventually replace javax.annotation.Generated
• Add volatile to featuresResolved
• Fix Java concurrency issue in feature resolution for old <=3.25.x gencode using lazy feature resolution.
• Remove Java runtime classes from kotlin release.
• Split maven dependencies into dev vs local
• Improve error messaging when detecting and erroring out on integer overflow of byte count limit variables.

Kotlin

• Remove Java runtime classes from kotlin release.

Csharp

• Remove "experimental API" warnings from members in the .NET protobuf runtime.
• Improve performace of repeated packed fixedSize fields

Objective-C

• [ObjC] Deprecate GPBFieldDescriptor.isOptional.
• [ObjC] Raise the library version and enable new generated code.

Rust

• Cherry-pick Rust fix to 31.x
• Add upb_Map_GetMutable API to upb
• See also UPB changes below, which may affect Rust.

Python

• Update GetCurrentTime to use datetime.datetime.now
• Make Py JSON float_precision apply to both float and double fields.
• Add '+' and '-' annotations for Timestamp and Duration in Python
• Bug fix for FieldMask.MergeFrom() with unset fields.
• Make python text_format able to skip unknown fields for repeated messages
• Fix segment fault for UPB Pyhon 'in' method of empty repeated extensions
• Fix upb to escape DefinitelyNeedsEscape (like " and ') for bytes field
• Check with fallback descriptorDB for FindExtensionByNumber()/FindAllExtensions in UPB python pool.
• Add clear() method to repeated fields in Python.
• Register Scalar/MessageMapContainerTypes as virtual subclasses
• Fix python codegen crash when C++ features are used.
• Add more detail to the comment for GetMessageClassesForFiles
• Add constructing unpack routine to Python Protobuf Any API.
• Implement typing for proto Timestamp/Duration assignments.

PHP

• Deprecate Descriptor Label. As an alternative, add helper methods for checking whether a field is required or repeated.
• Feat(php): improve return typehint when repeatedfield

PHP C-Extension

• Automated rollback of commit f9863df.
• Deprecate Descriptor Label. As an alternative, add helper methods for checking whether a field is required or repeated.
• Ruby: Allow to get a file descriptor by a file name
• Feat(php): improve return typehint when repeatedfield
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

• Fix silent failure of rb_test rules to run test
• Ruby | Add support for a protobuf debug build
• Ruby | Support installing the gem via git and some other small build tweaks
• Deprecate Descriptor Label. As an alternative, add helper methods for checking whether a field is required
• [Ruby]Implement #to_hash for message classes
• Drop Ruby 3.0

[Bruce Dubbs]

Fixed at commits

9613af1188 Update to gnupg-2.4.8.
6180d5c456 Update to abseil-cpp-20250512.0.
9df39f58e1 Update to protobuf-31.0.
eb1b23bae0 Update to ruby-3.4.4.
fb77d64594 Update to userspace-rcu-0.15.3 (liburcu).