[protobuf] error: undefined reference to 'google::protobuf::internal::kEmptyString' with the version 2.5.0

[Eren Yıldız]

Hi all,

I am having a problem with my auto-generated files. As I am not supposed to 
edit these files, I do not know how to fix this error either. I am using 
Ubuntu 12.04, the version of protobuff I have is 2.5.0, and I installed it 
from source.

The .proto file I have is the following:

message PointMsg {
  required float x = 1;
  required float y = 2;
  optional float z = 3;
  optional string name = 4 [default=""];
  
  required string sender = 5;
}

And the error I get is:

src-gen/Point.pb.h:334: error: undefined reference to 
'google::protobuf::internal::kEmptyString'
src-gen/Point.pb.cc:131: error: undefined reference to 
'google::protobuf::internal::kEmptyString'
src-gen/Point.pb.cc:132: error: undefined reference to 
'google::protobuf::internal::kEmptyString'
src-gen/Point.pb.cc:141: error: undefined reference to 
'google::protobuf::internal::kEmptyString'
/usr/local/include/google/protobuf/wire_format.h:296: error: undefined 
reference to 
'google::protobuf::internal::WireFormat::VerifyUTF8StringFallback(char 
const*, int, google::protobuf::internal::WireFormat::Operation)'


It should be noted that this error disappears If I have upgrade the version 
to 2.6.1. However I cannot do that, since I have other files which give 
error when I do so. Simply, I have to stick to 2.5.0.

Any thoughts on how to resolve this?



Thanks in advance.

-- 
You received this message because you are subscribed to the Google Groups 
"Protocol Buffers" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to protobuf+unsubscr...@googlegroups.com.
To post to this group, send email to protobuf@googlegroups.com.
Visit this group at http://groups.google.com/group/protobuf.
For more options, visit https://groups.google.com/d/optout.