我想在我的qt项目上实现GRPC，但首先我尝试运行一个grpc示例，但我得到了未定义引用错误。
main.cpp:

#include <helloworld.grpc.pb.h>

#include <grpc/grpc.h>
#include <grpcpp/server_builder.h>

#include <iostream>

class GreeterService final : public helloworld::Greeter::Service {
public:
  virtual ::grpc::Status SayHello(::grpc::ServerContext* context, const ::helloworld::HelloRequest* request, ::helloworld::HelloReply* response) {
    std::cout << "Server: message for \"" << request->name() << "\"." << std::endl;

    response->set_message("Hi " + request->name());

    return grpc::Status::OK;
  }
};

int main(int argc, char* argv[]) {
  grpc::ServerBuilder builder;
  builder.AddListeningPort("0.0.0.0:50051", grpc::InsecureServerCredentials());

  GreeterService my_service;
  builder.RegisterService(&my_service);

  std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
  server->Wait();

  return 0;
}

. profile文件：

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \

INCLUDEPATH += /home/grpc/include \
               /home/grpc/
DEPENDPATH  += /home/grpc//include \
               /home/grpc/
QMAKE_LFLAGS += -Wl,-rpath,"path_to_libgrpc++.so.1.45"
LIBS += -L/usr/local/lib `pkg-config --libs protobuf grpc++` -L/usr/lib -L/usr/lib64 -L/usr/lib/x86_64-linux-gnu

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

错误：

undefined reference to `helloworld::Greeter::Service::Service()'

我不知道为什么我得到这个错误，compailer可以看到标题主要也可以看到。但我认为有丢失的东西在我的.pro文件