Protobuf: added test for backward compability of messages, currently failing (proper parsing of unknown fields is needed)

proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile

@@ -35,6 +35,8 @@ generate:
 	./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/protoc-artifacts ./test/routeDone.proto
 	./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/protoc-artifacts ./test/route.proto
 	./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/protoc-artifacts ./test/cross-branch-access.proto
+	./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/protoc-artifacts ./test/base.proto
+	./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/protoc-artifacts ./test/extended.proto
 
 debug:
 	gdb --args ./protoc --kotlin_out=$$HOME/Downloads/carkot/proto/compiler/src ./test/addressbook.proto 

proto/compiler/google/src/google/protobuf/compiler/kotlin/test/base.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+message SomeMessage {
+	string stringField = 1;
+	int32 int32Field = 2;
+}

proto/compiler/google/src/google/protobuf/compiler/kotlin/test/extended.proto

@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+message ExtendedMessage {
+	string stringField = 1;
+	int32 int32Field = 2;
+	double doubleField = 3;
+	bytes bytesField = 4;
+}