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I am using c++ in ubuntu with apatana as my IDE.

I compiled the addressbook.proto file as follows:

protoc -I=/home/workspace/rtb/src/ --cpp_out=/home/workspace/rtb/src/ /home/workspace/rtb/src/addressbook.proto

I then included the output header file into my c++ code as follows:

#include "addressbook.pb.h"

That should be it. Right?

When I build...I get a list of errors that that is too long list. below is the last few lines. What am I missing? How do I use proto buffers in c++?

./src/addressbook.pb.o:(.rodata._ZTVN8tutorial11AddressBookE[vtable for tutorial::AddressBook]+0x40): undefined reference to `google::protobuf::Message::InitializationErrorString() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial11AddressBookE[vtable for tutorial::AddressBook]+0x48): undefined reference to `google::protobuf::Message::CheckTypeAndMergeFrom(google::protobuf::MessageLite const&)'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial11AddressBookE[vtable for tutorial::AddressBook]+0x88): undefined reference to `google::protobuf::Message::DiscardUnknownFields()'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial11AddressBookE[vtable for tutorial::AddressBook]+0x90): undefined reference to `google::protobuf::Message::SpaceUsed() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial6PersonE[vtable for tutorial::Person]+0x20): undefined reference to `google::protobuf::Message::GetTypeName() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial6PersonE[vtable for tutorial::Person]+0x40): undefined reference to `google::protobuf::Message::InitializationErrorString() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial6PersonE[vtable for tutorial::Person]+0x48): undefined reference to `google::protobuf::Message::CheckTypeAndMergeFrom(google::protobuf::MessageLite const&)'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial6PersonE[vtable for tutorial::Person]+0x88): undefined reference to `google::protobuf::Message::DiscardUnknownFields()'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial6PersonE[vtable for tutorial::Person]+0x90): undefined reference to `google::protobuf::Message::SpaceUsed() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial18Person_PhoneNumberE[vtable for tutorial::Person_PhoneNumber]+0x20): undefined reference to `google::protobuf::Message::GetTypeName() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial18Person_PhoneNumberE[vtable for tutorial::Person_PhoneNumber]+0x40): undefined reference to `google::protobuf::Message::InitializationErrorString() const'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial18Person_PhoneNumberE[vtable for tutorial::Person_PhoneNumber]+0x48): undefined reference to `google::protobuf::Message::CheckTypeAndMergeFrom(google::protobuf::MessageLite const&)'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial18Person_PhoneNumberE[vtable for tutorial::Person_PhoneNumber]+0x88): undefined reference to `google::protobuf::Message::DiscardUnknownFields()'
./src/addressbook.pb.o:(.rodata._ZTVN8tutorial18Person_PhoneNumberE[vtable for tutorial::Person_PhoneNumber]+0x90): undefined reference to `google::protobuf::Message::SpaceUsed() const'
./src/addressbook.pb.o:(.rodata._ZTIN8tutorial11AddressBookE[typeinfo for tutorial::AddressBook]+0x10): undefined reference to `typeinfo for google::protobuf::Message'
./src/addressbook.pb.o:(.rodata._ZTIN8tutorial6PersonE[typeinfo for tutorial::Person]+0x10): undefined reference to `typeinfo for google::protobuf::Message'
./src/addressbook.pb.o:(.rodata._ZTIN8tutorial18Person_PhoneNumberE[typeinfo for tutorial::Person_PhoneNumber]+0x10): undefined reference to `typeinfo for google::protobuf::Message'
collect2: ld returned 1 exit status
make: *** [rtb] Error 1
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  • Those are linking errors.Make sure you are linking to the library. Commented Jan 16, 2012 at 4:48
  • solved: I had to add -lprotobuf Commented Jan 16, 2012 at 5:02

1 Answer 1

Reset to default
6

You have to link your code to the protocol buffers library. Most likely, the flag you need is
-l protobuf.

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1 Comment

actually i am running tryProto.cpp file as: g++ -l protobuf tryProto.cpp and still getting the same error, adding -lprotobuf has not made any difference, is there anything i am missing

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