Error preprocessor directives when building

Question

When building a VS2013 solution (migrated from VS8) I get the following error :

Error 1 error C2220: warning treated as error - no 'object' file generated C:\Program Files\Microsoft Visual Studio 12.0\VC\atlmfc\include\afx.h 38 Warning 2 warning C4996: 'MBCS_Support_Deprecated_In_MFC': MBCS support in MFC is deprecated and may be removed in a future version of MFC. C:\Program Files\Microsoft Visual Studio 12.0\VC\atlmfc\include\afx.h 38

This is caused bij the following code :

    #ifdef _MBCS
// Warn about MBCS support being deprecated: see http://go.microsoft.com/fwlink/p/?LinkId=279048 for more information.
#pragma warning(push)
#pragma warning(1 : 4996)
inline __declspec(deprecated("MBCS support in MFC is deprecated and may be removed in a future version of MFC.")) void MBCS_Support_Deprecated_In_MFC() { }

class MBCS_Deprecated_MFC
{
public:
    MBCS_Deprecated_MFC() { MBCS_Support_Deprecated_In_MFC(); }
};
#pragma warning(pop)
#endif

How can I find where _MBCS is defined in the solution. Find doesn't has any results.

Answer 1

The _MBCS symbol will be defined as a result of the settings in your project properties. Look at General->Character Set - this is what adds the required entries to the command line.

To continue using MBCS, you need to install the optional support from Microsoft here

As it notes in MSDN:

The code in your question actually gives a link to this blog post, which discusses the changes and includes a link to the download:

// Warn about MBCS support being deprecated: see http://go.microsoft.com/fwlink/p/?LinkId=279048 for more information.

So, you can either download the patch from the link above or migrate your application to UNICODE.