Brace-initialization of an array of structs in c++11

Here is my code:

#include <string>

struct A
{
    int a;
    std::string sa;
};

int main()
{
    A arr[3]{};
}

When I compile it with gcc 4.8.2 (on Ubuntu 14.04) with -std=gnu++11 option I get the following error:

example.cpp: In function ‘int main()’:
example.cpp:11:14: internal compiler error: in gimplify_init_constructor, at gimplify.c:4271
 A arr[3]{};
          ^

Why does it throw an internal compiler error? Is it a compiler bug?