Binary compatibility shims for GeneratedMessageV3, SingleFieldBuilder… #17934
+1,500
−57
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…V3, RepeatedFieldBuilderV3, and their nested classes to restore binary compatibility with <=v3.x.x generated code built against v3.x.x prior to v4.26.0 breaking release.
3.x.x descriptor.proto generated code is not supported with 4.x.x runtime, since this results in an ODR violation with the descriptor.proto built into the 4.x.x runtime. This is expected to result in undefined behavior / failures.
Tested against //java/core:v25_generated_message_test_jar (binary compatibility) and //java/core:v25_generated_message_test_srcjar (source compatibility)
PiperOrigin-RevId: 664819152
Cherry-pick of df8a11e