Protobuf 3.2.0 + Qt 5.8 (Windows)

[Mastic Cover]

Hi everyone,

I'm trying to build Protobuf with Minwg from MSYS2 as specified in documentation (C++ Installation - Windows). Everything goes perfect and all libraries are created.

The problem comes trying to compile and test the "addressbook" sample in Qt/C++. After generating the .pb.cc and .pb.h, I add this to my .pro file inside my Qt project:


# Google Protocol Buffers library
INCLUDEPATH += "C:\\protobuf\\install\\include"
LIBS += -L"C:\\protobuf\\install\\lib" -llibprotobuf


A lot of "undefined reference" errors (almost 200 errors) are shown and I am not able to make it work:

C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:86: error: undefined reference to `google::protobuf::internal::AssignDescriptors(std::string const&, google::protobuf::internal::MigrationSchema const*, google::protobuf::Message const* const*, unsigned int const*, google::protobuf::MessageFactory*, google::protobuf::Metadata*, google::protobuf::EnumDescriptor const**, google::protobuf::ServiceDescriptor const**)'

C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:97: error: undefined reference to `google::protobuf::internal::RegisterAllTypes(google::protobuf::Metadata const*, int)'

C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:112: error: undefined reference to `google::protobuf::internal::VerifyVersion(int, int, char const*)'

And so on...

Has anyone ever come across this error? Same proccess, same project, tested in a Fedora machine... it works like a charm! But I have to make it work on Windows :(

Thanks in advance for your help.

Mastic.

[Mastic Cover]

EDIT:

Tested this:

# Google Protocol Buffers library
INCLUDEPATH += "C:\\protobuf\\install\\include"
LIBS += -L"C:\\protobuf\\install\\lib" -llibprotobuf

And this one:

# Google Protocol Buffers library
INCLUDEPATH += "C:\\protobuf\\install\\include"

LIBS += -L"C:\\protobuf\\install\\lib" -lprotobuf


Same result over and over again.

[Adam Cozzette]

My first guess would be that you are somehow mixing different protobuf versions: using generated code from a new version of protoc with a protobuf runtime library of an older version. Is that true for your Windows setup?

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[Mario Emmenlauer]

Hey,

I've run into the same problem. According to what I found on the internet,
Qt ships protobuf < 3.2, and there was no straightforward way to disable it.
Eventually they will conflict, so I needed to downgrade protobuf to 3.1
again to make it work.

I hope the next Qt release will upgrade protobuf and/or allow to configure it.

Cheers,

Mario



On 03.03.2017 12:19, Mastic Cover wrote:
> EDIT:
>
> Tested this:
>
> *# Google Protocol Buffers library

> INCLUDEPATH += "C:\\protobuf\\install\\include"

> LIBS += -L"C:\\protobuf\\install\\lib" -llibprotobuf*
>
> And this one:
>
> *# Google Protocol Buffers library

> INCLUDEPATH += "C:\\protobuf\\install\\include"

> LIBS += -L"C:\\protobuf\\install\\lib" -lprotobuf*

>
>
> Same result over and over again.
>
>
>
>
> El viernes, 3 de marzo de 2017, 12:16:14 (UTC+1), Mastic Cover escribió:
>
> Hi everyone,
>
> I'm trying to build Protobuf with Minwg from MSYS2 as specified in documentation (C++ Installation - Windows). Everything goes perfect and all libraries are
> created.
>
> The problem comes trying to compile and test the "addressbook" sample in Qt/C++. After generating the .pb.cc and .pb.h, I add this to my .pro file inside my
> Qt project:
>
>

> *# Google Protocol Buffers library

> INCLUDEPATH += "C:\\protobuf\\install\\include"

> LIBS += -L"C:\\protobuf\\install\\lib" -llibprotobuf*

>
>
> A lot of "undefined reference" errors (almost 200 errors) are shown and I am not able to make it work:
>

> /C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:86 <http://addressbook.pb.cc:86>: error: undefined reference to

> `google::protobuf::internal::AssignDescriptors(std::string const&, google::protobuf::internal::MigrationSchema const*, google::protobuf::Message const*
> const*, unsigned int const*, google::protobuf::MessageFactory*, google::protobuf::Metadata*, google::protobuf::EnumDescriptor const**,
> google::protobuf::ServiceDescriptor const**)'
>

> C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:97 <http://addressbook.pb.cc:97>: error: undefined reference to

> `google::protobuf::internal::RegisterAllTypes(google::protobuf::Metadata const*, int)'
>

> C:\Qt Developments\MyProject\protoFolder\addressbook.pb.cc:112 <http://addressbook.pb.cc:112>: error: undefined reference to

> `google::protobuf::internal::VerifyVersion(int, int, char const*)'
>

> And so on.../

>
> Has anyone ever come across this error? Same proccess, same project, tested in a Fedora machine... it works like a charm! But I have to make it work on
> Windows :(
>
> Thanks in advance for your help.

Viele Gruesse,

Mario Emmenlauer


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[Mastic Cover]

No mixing protobuf versions, clean protobuf build and project from https://developers.google.com/protocol-buffers/docs/cpptutorial

Linux --> Ok
Windows --> Fail

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[Mastic Cover]

Si Mario,

I switched to another project and left this in standby, but I tried protobuf 3.1.0 and 3.0.2 and same problem.

I hope to get back into it in a few weeks and do more testing, but it was hopeless :/

Thanks,

Mastic