Announcements

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

Compiler

• Avoid calling absl::InitializeLog in protoc with MSVC (https://github.com/protocolbuffers/protobuf/commit/aa7fcb3662f677b6ef06b55d5cae9d5b242fa1ef)

C++

• Fix string_type bugs in edition 2023 (#17211) (https://github.com/protocolbuffers/protobuf/commit/4923b8d72d39a4189ca7c7b9e20359d6ba527a10)
• Add simple conformance test that builds the old gencode against the current runtime. (https://github.com/protocolbuffers/protobuf/commit/9cfb59b5e305dba959403b56112d9a8cf1f4d832)
• Make the underlying type of the enum by 8-bits instead of using bitfields for (https://github.com/protocolbuffers/protobuf/commit/316f493b2f7f87f4402caea0d0ae1f332e2550fb)

Java

• Cleanup imports and comments in V3 stubs. (https://github.com/protocolbuffers/protobuf/commit/270ca6681a686fea24e23f7a389e4e3997409a4c)
• Add stubs for GeneratedMessageV3, RepeatedFieldBuilderV3, SingleFieldBuilderV3 for compatibility with older <4.26.x gencode. (https://github.com/protocolbuffers/protobuf/commit/1e360a422a04942ff0758f4a390fb6c27b680c96)
• Fix checking unknown field set empty which wasn't exposed yet in 27.x (https://github.com/protocolbuffers/protobuf/commit/c7a006a225e0b94b639a9be694b03c835f4db6d6)
• Reserialize all unresolved features using java features from the generated pool in case of descriptors from the custom pool. (https://github.com/protocolbuffers/protobuf/commit/2426a02b90d61e6c18b8ffa411e76b1642f47ad6)
• Reparse unknown features using extension registry containing Java features. (https://github.com/protocolbuffers/protobuf/commit/e5ddc45645871fbe2c6fc089ebe09f72ca727b5e)
• Fix data race in crosslink. (https://github.com/protocolbuffers/protobuf/commit/3d71e22b7ae17cbe82dd20a29ef7ef4e75e06ec5)
• Fix delimited inheritance in all languages. (https://github.com/protocolbuffers/protobuf/commit/c4f359ebf03e235d348a363d3b76660c6c960773)

Csharp

• Regenerate stale files (https://github.com/protocolbuffers/protobuf/commit/29f1b5259ea224abcaa9a4eb5e28f804ea8d5097)
• Fix delimited inheritance in all languages. (https://github.com/protocolbuffers/protobuf/commit/c4f359ebf03e235d348a363d3b76660c6c960773)

Python

• Fix delimited inheritance in all languages. (https://github.com/protocolbuffers/protobuf/commit/c4f359ebf03e235d348a363d3b76660c6c960773)

PHP

PHP C-Extension

• Regenerate stale files (https://github.com/protocolbuffers/protobuf/commit/29f1b5259ea224abcaa9a4eb5e28f804ea8d5097)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

Ruby C-Extension

• Regenerate stale files (https://github.com/protocolbuffers/protobuf/commit/29f1b5259ea224abcaa9a4eb5e28f804ea8d5097)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Fix delimited inheritance in all languages. (https://github.com/protocolbuffers/protobuf/commit/c4f359ebf03e235d348a363d3b76660c6c960773)

Other

• Port windows bootstrapping fix (#17225) (https://github.com/protocolbuffers/protobuf/commit/19bd2115d04fcc6196e504a4f07d99b6f16be7d7)