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++ library.

Why do I get the exact same sequence for every run of the compiled executable? Is

Answer 1

This is a GCC bug, fixed in GCC 9.2.

If you have this problem, update your compiler. (You can get a fresh GCC from MSYS2, for example.)