bin/x86-windows/google/protobuf/compiler/plugin.proto in grpc-tools-1.28.0 vs bin/x86-windows/google/protobuf/compiler/plugin.proto in grpc-tools-1.30.0.pre1

@@ -105,9 +105,19 @@
   // problem in protoc itself -- such as the input CodeGeneratorRequest being
   // unparseable -- should be reported by writing a message to stderr and
   // exiting with a non-zero status code.
   optional string error = 1;
 
+  // A bitmask of supported features that the code generator supports.
+  // This is a bitwise "or" of values from the Feature enum.
+  optional uint64 supported_features = 2;
+
+  // Sync with code_generator.h.
+  enum Feature {
+    FEATURE_NONE = 0;
+    FEATURE_PROTO3_OPTIONAL = 1;
+  }
+
   // Represents a single generated file.
   message File {
     // The file name, relative to the output directory.  The name must not
     // contain "." or ".." components and must be relative, not be absolute (so,
     // the file cannot lie outside the output directory).  "/" must be used as