v3.20.0

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2022-03-25 version 3.20.0 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)

C++

• Add option to use external GTest in CMake (#​8736)
• cmake: Set correct sonames for libprotobuf-lite.so and libprotoc.so (#​8635) (#​9529)

Java

• Revert "Standardize on Array copyOf" (#​9400)
• Resolve more java field accessor name conflicts (#​8198)

Python

• Pin multibuild scripts to get manylinux1 wheels back (#​9216)
• Dropped support for Python < 3.7 (#​9480)

PHP

• fix: [PHP] add missing reserved classnames (#​9458)

Ruby

• Dropped Ruby 2.3 and 2.4 support for CI and releases. (#​9311)
• [Ruby] Message.decode/encode: Add max_recursion_depth option (#​9218)
• Ruby: rename max_recursion_depth to recursion_limit (#​9486)
• Fix conversion of singleton classes in Ruby (#​9342)
• Suppress warning for intentional circular require (#​9556)
• [Ruby] allow encode json options to be an object that responds to to_hash (#​9513)

Other

• [C#] Fix trim warnings (#​9182)
• Add protoc-gen-go-svc to options.md (#​9280)
• Fixes NullReferenceException when accessing FieldDescriptor.IsPacked (#​9430)
• Add ToProto() method to all C# descriptor classes (#​9426)
• Add cmake option protobuf_INSTALL to not install files (#​7123)
• [CMake] Allow custom plugin options e.g. to generate mocks (#​9105)
• Add an option to preserve proto names in JsonFormatter (#​6307)
• Add test scope to kotlin-test for protobuf-kotlin-lite (#​9518)
• Add prefix_to_proto_package_mappings_path ObjC option. (#​9498)
• [ObjC] Rename proto_package_to_prefix_mappings_path to package_to_prefix_mappings_path. (#​9552)
• cmake: Use linker version scripts (#​9545)
• Add a generation option to control use of forward declarations in headers. (#​9568)
• [C#] fix parse failure for extensions with large field numbers (#​9591)