QByteArray autotest fails on windows:

FAIL!  : tst_QByteArray::qvsnprintf() Compared values are not the same
   Actual (buf[5]): ?
   Expected (char(42)): *
.\tst_qbytearray.cpp(526) : failure location

It appears that microsoft implementation of vsprintf overwrites bytes after null terminator in target buffer, which makes this test fail. This is probably some security feature.