/Zc:wchar_t (wchar_t Is Native Type)
When specified, the type wchar_t becomes a native type that maps to __wchar_t in the same way that short maps to __int16. /Zc:wchar_t is on by default.
If /Zc:wchar_t- is specified, the compiler requires you to either define wchar_t or to include one of the many header files that defines it (for example, wchar.h). Typically, wchar_t is defined as an unsigned short.
With /Zc:wchar_t, the compiler recognizes wchar_t as a native type. Seefor more information about wchar_t.
__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; seefor more information.
Explicit references to comsupp.lib, either from the comment pragma or via the command line, should be changed to now use either comsuppw.lib or comsuppwd.lib, as /Zc:wchar_t is now on by default. comsupp.lib should still be used when compiling with /Zc:wchar_t-.
For more information about conformance issues with Visual C++, see.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see.
Click the C/C++ folder.
Click the Language property page.
Modify the Treat wchar_t as Built-in Type property.
To set this compiler option programmatically