c++ - Why do I get the same sequence for every run with std::random_device with mingw gcc4.8.1?

Question

I use the following code to test the C++ <random> library.

Why do I get the exact same sequence for every run of the compiled executable? Is rd() deterministic upon compilation? How do I get different output for each run?

GCC 4.8.1 on Windows 7 64bit. Using MinGW distribution from http://nuwen.net/mingw.html.

EDIT: I tested the same piece code with Visual Studio. There is no problem. The outputs are non deterministic. This could be a bug in mingw gcc 4.8.1 that I used.

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

int main(){
 random_device rd;
 mt19937 mt(rd());
 uniform_int_distribution<int> dist(0,99);
 for (int i = 0; i< 16; ++i){
    cout<<dist(mt)<<" ";
 }
 cout <<endl;
}

Answer 1

From http://en.cppreference.com/w/cpp/numeric/random/random_device:

Note that std::random_device may be implemented in terms of a pseudo-random number engine if a non-deterministic source (e.g. a hardware device) is not available to the implementation.

I would expect a decent implementation to at least seed the RNG though.

Edit: I suspect they deliberately chose to deliver the same sequence each time, to make obvious the fact that the stream wasn't as random as promised.