Function SetFlagsFromEnv

paddle/common/flags_native.cc:458–475

 */

void SetFlagsFromEnv(const std::vector<std::string>& flags, bool error_fatal) {
  bool success = true;
  for (const std::string& flag_name : flags) {
    std::string env_var_name = std::string("FLAGS_") + flag_name;
    std::string env_var_value;
    if (GetValueFromEnv(env_var_name, &env_var_value)) {
      success =
          FlagRegistry::Instance()->SetFlagValue(flag_name, env_var_value);
    } else if (error_fatal) {
      LOG_FLAG_ERROR("environment variable \"" + env_var_name +
                     "\" is not set.");
      success = false;
    }
  }
  if (error_fatal && !success) {
    exit_with_errors();
  }
}

static bool allow_undefined_flags = false;