Using macro__ARM_WCHAR_NO_IO to disable FILE declaration and wide I/O function prototypes
In strict C/C++ mode, the header files wchar.h and cwchar do not declare the
FILE type. You can also define the macro
__ARM_WCHAR_NO_IO to cause these header files not to declare
FILE or the wide I/O function prototypes.
FILE type can lead to better
consistency in debug information.