OK, this was due to a misunderstanding of the output files produces by
Bazel.
I have a proto file that defines a simple unary service. When I compile
this using Bazel and the cc_grpc_library rule, it outputs an archive
library and a shared object and prints these to the terminal. I was
assuming that I just needed to pass this archive to my top level
compilation flow but it seems that I need the archive AND all
service.grpc.pb.{cc,h} and service.pb.{cc,h} files.
On Monday, 28 November 2022 at 18:30:48 UTC Shareef Jalloq wrote:
> Sorry, I fixed the missing reflection library, it's jus the
> helloworld::Greeter::Service::Service() issues. But these are defined in
> the auto-generated output of the protocol buffer compiler.
>
> On Monday, 28 November 2022 at 18:13:54 UTC Shareef Jalloq wrote:
>
>> Hi,
>>
>> I've been trying to integrate the simple C++ callback example into my
>> application to make sure I can compile it successfully before implementing
>> my full protocol. However, I'm getting linker errors and can't spot what I
>> might have missed.
>>
>> I've really just copied the greeter_callback_server.cc contents and put
>> it in my app. My linker settings look like:
>>
>> -lgrpc -lgrpc++ -lgpr -labsl_synchronization -lprotobuf
>> -lgrpc_plugin_support -L/opt/grpc/v1.50.1/lib
>>
>> after having compiled and installed using CMake.
>>
>> The errors I'm seeing are:
>>
>> /usr/bin/ld: grpc_server.o: in function `GrpcServer::CreateServer()':
>> grpc_server.cc:(.text+0x2e5): undefined reference to
>> `grpc::reflection::InitProtoReflectionServerBuilderPlugin()'
>> /usr/bin/ld: grpc_server.o: in function
>> `helloworld::Greeter::WithCallbackMethod_SayHello<helloworld::Greeter::Service>::~WithCallbackMethod_SayHello()':
>> grpc_server.cc:(.text._ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEED2Ev[_ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEED5Ev]+0xb):
>>
>> undefined reference to `helloworld::Greeter::Service::~Service()'
>> /usr/bin/ld: grpc_server.o: in function
>> `helloworld::Greeter::WithCallbackMethod_SayHello<helloworld::Greeter::Service>::WithCallbackMethod_SayHello()':
>> grpc_server.cc:(.text._ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEC2Ev[_ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEC5Ev]+0x26):
>>
>> undefined reference to `helloworld::Greeter::Service::Service()'
>> /usr/bin/ld:
>> grpc_server.cc:(.text._ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEC2Ev[_ZN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEC5Ev]+0x1b1):
>>
>> undefined reference to `helloworld::Greeter::Service::~Service()'
>> /usr/bin/ld:
>> grpc_server.o:(.data.rel.ro._ZTIN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEE[_ZTIN10helloworld7Greeter27WithCallbackMethod_SayHelloINS0_7ServiceEEE]+0x10):
>>
>> undefined reference to `typeinfo for helloworld::Greeter::Service'
>> collect2: error: ld returned 1 exit status
>>
>
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