用ISE8.1进行波形仿真时总是出现Simulator:222 - Generated C++ compilation was unsuccessful

I've run into something like this fairly often. Usually because the
[C++] compiler was unable to write the executable, because Windows thought
it was busy.
There's a message about "unable to delete...", but it's usually lost in
the shuffle.

If this is the case, kill any runaway simulation process. If the file
remains busy, rename it. If that fails, pay your respects to Windows and
reboot.

我也是同样的问题，上面是我找到的解决办法，不太好使