c++11 std::array of std::atomic zero initialization failure to compile?

Question

Compiling the below with zero-initialized atomics under both g++ 4.7 and g++ 4.8.2 takes hours. Default-initialized atomics and zero-initialized non-atomic compile immediately.

#include <iostream>
#include <array>
#include <algorithm>
#include <atomic>

int main(int argc, char* argv[]) {

    //std::array<std::atomic<int>, 1000000>  arr;         // default initialization (i.e., random data) = FAST

    //std::array<int, 1000000>  arr={{}};     // zero init non-atomic = FAST

    //std::array<std::atomic<int>, 1000000>  arr{{}};   // zero initialization = FOREVER

    //std::array<std::atomic<int>, 1000000>  arr={{}};     // zero init via assignment = FOREVER

    std::array<std::atomic<int>, 1000000>  arr{};   // zero initialization = FOREVER

    std::cerr << "sum = " << std::accumulate(arr.begin(), arr.end(), 0) << std::endl;
}

g++ -std=c++11 array.cpp

Is the only option to memset the array manually?