'google::protobuf::io::GzipOutputStream does not write anything if the file handle is closed at the end

The following code writes to file as expected

  int ofd = open(filename.c_str(),  O_WRONLY | O_CREAT | O_TRUNC, 0777);
  google::protobuf::io::FileOutputStream outp(ofd);
  google::protobuf::io::GzipOutputStream fout(&outp);

  MyMessage msg;
  ConstructMessage(&msg);
  CHECK(google::protobuf::util::SerializeDelimitedToZeroCopyStream(msg, &fout));
  fout.Close();
  // close(ofd);

However if I uncomment the last line // close(ofd);, I get empty file. Why is that?

Also if I skip using the Gzip wrapper, the last line causes no problem. Does this look like a bug?

c++protocol-buffersgzipoutputstream


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