Duplicate symbol error — global constant

Question

In the header of the class, outside of interface declaration, I\'ve declared global constants:

NSString * const gotFilePathNotification = @\"gotFilePath\";
N         


        

Answer 1

You have two identifier(s) with same name across two different compilation unit(s) at file scope. This violates One Definition Rule. Instead you need to -

1. Declare the global variables marking to have external linkage in a header file.

   extern NSString * const gotFilePathNotification;
   

2. Now provide the definition in only one source file.

   NSString * const gotFilePathNotification = @"gotFilePath";
   

Now where ever you need to use these variables, include the header in the source file.