Xcode Warnings: What is "Unused Labels"

Question

In Xcode if you go to project build settings, under warnings there is entry for "Unused labels". What is meant by the term "Labels"?

I understand what is meant by unused (for example, "unused variable")

Answer 1

A label can be used in C (and therefore Objective-C) to mark a point in your code and is typically seen with goto. (Using goto is often considered not best practice).

If you omitted the line with goto below, the compiler can warn you if you set the unused labels warning.

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {

        goto myLabel
        NSLog(@"I won't print");

myLabel:
        NSLog(@"I will print");
    }
    return 0;
}