Protocol Buffers v27.2

Announcements

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

Compiler

• Avoid calling absl::InitializeLog in protoc with MSVC (aa7fcb3)

C++

• Fix string_type bugs in edition 2023 (#17211) (4923b8d)
• Add simple conformance test that builds the old gencode against the current runtime. (9cfb59b)
• Make the underlying type of the enum by 8-bits instead of using bitfields for (316f493)

Java

• Cleanup imports and comments in V3 stubs. (270ca66)
• Add stubs for GeneratedMessageV3, RepeatedFieldBuilderV3, SingleFieldBuilderV3 for compatibility with older <4.26.x gencode. (1e360a4)
• Fix checking unknown field set empty which wasn't exposed yet in 27.x (c7a006a)
• Reserialize all unresolved features using java features from the generated pool in case of descriptors from the custom pool. (2426a02)
• Reparse unknown features using extension registry containing Java features. (e5ddc45)
• Fix data race in crosslink. (3d71e22)
• Fix delimited inheritance in all languages. (c4f359e)

Csharp

• Regenerate stale files (29f1b52)
• Fix delimited inheritance in all languages. (c4f359e)

Python

• Fix delimited inheritance in all languages. (c4f359e)

PHP

PHP C-Extension

• Regenerate stale files (29f1b52)
• See also UPB changes below, which may affect PHP C-Extension.

Ruby

Ruby C-Extension

• Regenerate stale files (29f1b52)
• See also UPB changes below, which may affect Ruby C-Extension.

UPB (Python/PHP/Ruby C-Extension)

• Fix delimited inheritance in all languages. (c4f359e)

Other

• Port windows bootstrapping fix (#17225) (19bd211)