代码很简单，但是总是提示fstream头文件有错误，操作系统是centos7 64位。

#include <fstream>
#include <iostream>
using namespace std;

int main()
{
    cout<<"hello,world"<<endl;
    return 0;
}

编译报如下错误：
[root@mystudy test]# g++ -o test test.cpp
In file included from /usr/include/c++/4.8.2/fstream:41:0,

             from test.cpp:1:

/usr/include/c++/4.8.2/cstdio:120:11: error: '::ets' has not been declared
using ::ets;