Solution-wide #define

Question

Is there a way to globally declare a #define?

Like I want to have a file that has for instance,

#define MONO

and I want all source-

Answer 1

In case you have both C# and C++ projects in the solution and need to share preprocessor definitions among them. Create some SolutionDefines.targets file near your *.sln as follows

    
        $(DefineConstants);MY_DEFINITION
    
  
    
      MY_DEFINITION;%(PreprocessorDefinitions)
    
  

Then add to C/C++/C# *.vcproj/*.vcxproj/*.csproj project files this line somewhere in the end

Ok, now you can enjoy #if MY_DEFINITION in C# and #ifdef MY_DEFINITION in C/C++. Visual Studio C# editor doesn't like this way and tells there is no MY_DEFINITION defined. But, C# compiler csc.exe gets the symbol properly.