objective c - Preprocessor target checking -

i want use preprocessor commands test target i'm compiling for. every example read told :

• add preprocessor macro in target.

• do :

  #ifdef target_name_macro     nslog(@"target_name"); #else     nslog(@"another_target"); #endif 

however, isn't working. condition passes whenever in target_name's file never passes when doing in target's file. need test in target's file if i'm running in test mode.

i've tried few things, none worked out.

any ideas?