Dev gzf exp (#1696)

zhifu gao

2024-05-06 7be2a1d7e454e9b6d10b4496254214e32f5b5627

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#define GFLAGS_DLL_DECLARE_FLAG
 
#include <iostream>
#include <gflags/gflags_declare.h>
 
DECLARE_string(message); // in gflags_delcare_test.cc
 
void print_message();
void print_message()
{
  std::cout << FLAGS_message << std::endl;
}