how to pass the user-defined macro to xcodebuild?

Question

I build my project by xcodebuild in command line. Not in xCode. I want to pass some marc to the project so that it can affect the code. Such as code below:

Answer 1

I know this is an old post, but why not just use:

xcodebuild GCC_PREPROCESSOR_DEFINITIONS='$GCC_PREPROCESSOR_DEFINITIONS API_TYPE=1'

If you want to be able to have it optionally override an existing define in app, just code something like this:

#define DEFAULT_API_TYPE 1

#ifdef API_TYPE
  #define REAL_API_TYPE API_TYPE
#else
  #define REAL_API_TYPE DEFAULT_API_TYPE
#endif