c++ - “fseeko64 未在此范围内声明”（mingw，windows）

Question

试着用 MINGW 编译这个 c++ 代码

#include <stdio.h>

int main ()
{
    FILE * pFile;
    char file_name[100] = "test";
    pFile = fopen (file_name,"rb");
    fseeko64(pFile, 0, SEEK_END);
    long long file_dim = ftello64 (pFile);
    printf ("File:\n%s\ncontains %I64d bytes:\n", file_name, file_dim);
    return 0;
}

并且总是得到

'fseeko64' was not declared in this scope
'ftello64' was not declared in this scope

为什么？怎么了？？

更新：

我找到了原因：“-std=c++11”开关给出了这个！“-std=gnu++11”好