Trouble Compiling and Linking library under Windows 7

[Ricardo Iglesias]

Good evening. I'm currently attempting to integrate the protocol buffer library into an embedded code project I'm assigned to, which uses Windows 7 to flash code onto hardware.

I have followed this guide to installing the protocol buffer libraries/binaries on windows, and believe I am very close to getting my project to compile. Currently, I have the following directory structure:

Desktop
  install
    bin
    include
    lib
  ProtoTest
    data_revised.pb.h
    data_revised.pb.cc
    main.cc



Where ProtoTest is where the code I want to compile resides, and the install folder resulting from the compilation contains the binary for the protobuffer compiler, as well as the includes and libraries.

I wish to run the following command:

g++ -std=c++14 -L/cygdrive/c/Users/<username>/Desktop/install/lib/ \
              -lprotobuf \
              -I/cygdrive/c/Users/<username>/Desktop/install/include \
               ProtoTest/data_revised.pb.cc ProtoTest/main.cc

However, when I run it, I get errors of this form:

 g++ -std=c++14 -L/cygdrive/c/Users/solarcar/Desktop/install/lib/ -lprotobuf -I/cygdrive/c/Users/solarcar/Desktop/install/include ProtoTest/data_revised.pb.cc ProtoTest/main.cc

In file included from ProtoTest/data_revised.pb.cc:4:0:

ProtoTest/data_revised.pb.h:181:8: error: 'void IntTriplet::SerializeWithCachedSizes(google::protobuf::io::CodedOutputStream*) const' marked 'final', but is not virtual

   void SerializeWithCachedSizes(

        ^~~~~~~~~~~~~~~~~~~~~~~~

ProtoTest/data_revised.pb.h:183:35: error: 'google::protobuf::uint8* IntTriplet::InternalSerializeWithCachedSizesToArray(google::protobuf::uint8*) const' marked 'final', but is not virtual

   ::PROTOBUF_NAMESPACE_ID::uint8* InternalSerializeWithCachedSizesToArray(

  

If I recompile the protocol buffer I'm using, I get slightly different errors:

/tmp/ccRjenfk.o:data_revised.pb.cc:(.text+0x22): undefined reference to
google::protobuf::internal::VerifyVersion(int, int, char const*)

or

...:data_revised.pb.cc:...:undefined reference to "google::protobuf::Message::SpaceUsedLong() const"

I'm a bit more lost as to how to fix this more recent error, since I am (hopefully) including the libraries correctly.

Is there any way I can verify the library is indeed being installed correctly?

[Ricardo Iglesias]

I'm not sure if this would necessarily change anything, but I should mention that I'm running all of this through the Cygwin application, which came with cmake, make, and g++ (which is how I compiled the library in teh first place).

[Adam Cozzette]

It looks like you are mixing one version of protoc with a different version of the protobuf runtime (i.e. libprotobuf). It's important for the protobuf generated code to be built with a protoc of the same version as the runtime library.

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[Ricardo Iglesias]

This wasn't the issue. It compiled just fine when I moved the

-lprotobuf

to the end of the compilation.

Additionally, I'm not sure why the libprotobuf would be a different version, since I had followed the steps on the github readme to get both the protoc and the libprotobuf. The code runs fine for now.

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