Compiler Error : Undefined symbols for architecture x86_64

[userM7Lh5621CD0P]

using ssdb for long time but with php client. fine in most cases, but there is something I have to iterate many many times .. and with C/C++ I should be able to save a lot of time ..

Compiler failed with error Undefined symbols for architecture x86_64

macOS 10.15.6 Catalina

g++-11 --version

g++-11 (Homebrew GCC 11.2.0_3) 11.2.0

I have followed the steps in the doc readme

g++ -o hello-ssdb -I<path of api/cpp> hello-ssdb.cpp <path of api/cpp>/libssdb-client.a

error :

g++ -o hello-ssdb -I<path of api/cpp> hello-ssdb.cpp <path of api/cpp>/libssdb-client.a

..in libssdb-client.a(SSDB_impl.o)
..in libssdb-client.a(link.o)

ld: symbol(s) not found for architecture x86_64

g++ -o hello-ssdb.cpp hello-ssdb libssdb-client.a

ld: can't link with a main executable file

g++ -o hello-ssdb hello-ssdb.cpp

Undefined symbols for architecture x86_64:
  "__ZN4ssdb6Client7connectEPKci", referenced from:
      _main in cciJLzzz.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

.cpp

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <vector>
#include "SSDB_client.h"

int main(int argc, char **argv){
    const char *ip = (argc >= 2)? argv[1] : "127.0.0.1";
    int port = (argc >= 3)? atoi(argv[2]) : 8888;

    ssdb::Client *client = ssdb::Client::connect(ip, port);

    if(client == NULL){
        printf("fail to connect to server!\n");
    }else{
        printf("ssdb client\n");
    }

    delete client;
    return 0;
}

I would like to connect to the ssdb server ..

I also asked stackoverflow