Dev gzf new (#1561)

zhifu gao

2024-03-29 f5f8f81ce9ff288b499b474ee1181cab41426cda

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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;
}