/Zc:wchar_t - wchar_t Is Native Type (Windows CE 5.0)
This option causes the type wchar_t to become a native type that maps to __wchar_t in the same way that short maps to __int16.
With /Zc:wchar_t, the compiler recognizes wchar_t as a native type.
__wchar_t is always available.
By providing overloads for both the unsigned short and __wchar_t variations of wchar_t, you can create libraries that can easily be linked with code compiled with or without /Zc:wchar_t and avoid the need to provide two different builds of the library (one with and one without /Zc:wchar_t enabled).
When /Zc:wchar_t is specified, _WCHAR_T_DEFINED and _NATIVE_WCHAR_T_DEFINED symbols are defined. For more information, see Predefined Macros.
Send Feedback on this topic to the authors