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

I know solution for C# projects (I don't tested it for any other projects)

For example you have:

Project1\
Project2\
Solution1\Solution1.sln
Solution2\Solution2.sln

Create SolutionDefines.targets file in solution directory

Project1\
Project2\
Solution1\Solution1.sln
Solution1\SolutionDefines.targets
Solution2\Solution2.sln
Solution2\SolutionDefines.targets
Solution3\Solution2.sln
Solution3\|no target file|

in each project file add:

In Solution1\SolutionDefines.targets add:

    
        $(DefineConstants);TRACING_BUILD
    

In Solution2\SolutionDefines.targets add:

    
        $(DefineConstants);ANOTHER_DEFINE
    

In this case you have:

For Solution1 - all projects have TRACING_BUILD define added

For Solution2 - all projects have ANOTHER_DEFINE define added

For Solution3 - all projects - no defines added

In this approach you must store all solutions with solution wide defines in separate directories