how to create a library with Protobuf elements without dependencies - c++

Question

I have to create a Library for my work that contains Protobuf elements. It should run on every other PC without installing Protobuf. But I can not make the library run without having also the Protobuf files in the same folder (so I compile this files to and the user have to install Protobuf)
So I created for this a test program to demonstrate my problem:
->alias.proto
syntax = "proto3";
package aliasPackage;
message NumberSave{
int32 number = 1;
}
I created the .h and .cc with
protoc -I. --cpp_out=. alias.proto
->Backbone.h
#include "alias.pb.h"
class Backbone{
public:
Backbone();
~Backbone();
void save_Number(int value);
int get_Number();
private:
aliasPackage::NumberSave number;
};
->Backbone.cpp
#include "../header/Backbone.h"
#include <google/protobuf/stubs/common.h>
Backbone::Backbone()
{
number.set_number(0);
}
Backbone::~Backbone()
{
google::protobuf::ShutdownProtobufLibrary();
}
void Backbone::save_Number(int value)
{
number.set_number(value);
}
int Backbone::get_Number()
{
return number.number();
}
->Backbone.h for the lib
class Backbone{
public:
Backbone();
~Backbone();
void save_Number(int value);
int get_Number();
};
Creating the lib out of the files with this command (I thought about a static one, compiling the all independences into the file, but it seems not to work)
g++ -c --std=c++20 -O3 -DBUILD_SHARED_LIBS=ON -I/usr/local/include *.c* -lpthread -L/usr/local/lib -lprotobuf && ar rcs Backbone.sll *.o
->main.cpp
#include "../libs/lib/Backbone.h"
#include <iostream>
int main(){
auto backbone = new Backbone();
backbone->save_Number(5);
std::cout<<backbone->get_Number()<<std::endl;
delete backbone;
return 0;
}
Compile command
g++ -Wall -Wextra -Wpedantic --std=c++20 -O3 main.cpp -L. -l:../libs/lib/Backbone.sll
What am I doing wrong? What's the right command to create a Lib so that users can use it without installing Protobuf?