#include <gflags/gflags.h>DEFINE_string(message,"","The message to print");voidprint_message();// in gflags_declare_flags.ccintmain(intargc,char**argv){gflags::SetUsageMessage("Test compilation and use of gflags_declare.h");gflags::ParseCommandLineFlags(&argc,&argv,true);print_message();return0;}