Xcode 6 linker error - Undefined symbols for architecture armv7

Question

After upgrading to Xcode 6 beta 7 (and now still with Xcode 6 GM) I am unable to link my Swift app. I receive errors such as:

Undefined symbols for archit

Answer 1

I am a filly when it comes to iOS Objective C, though I have been coding in several other languages for many years. So I am stabbing around in the dark most of the time with Objective C.

I started having this error, "Undefined symbols for architecture armv7", directly after declaring some "global" variables in my .h file like so:

extern NSString *globalNotes;
extern NSString *globalUserCountry;

I was then referring to these variables from the .m file like so:

globalNotes= @"Error (Marker 1010)";
globalUserCountry= @"No result";

THE FIX - To correct this, I changed them to object properties like so:

@property(nonatomic, strong, readwrite) NSString *globalNotes;
@property(nonatomic, strong, readwrite) NSString *globalUserCountry;

And referred to them like so:

self.globalNotes= @"Error (Marker 1010)";
self.globalUserCountry= @"No result";

That seemed to fix my problem.