Foo.h

//
//  Foo.h
//  InternCheck
//
//  Created by Andrew Toulouse on 5/23/14.
//  Copyright (c) 2014 Andrew Toulouse. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Foo : NSObject

@end

Foo.m

//
//  Foo.m
//  InternCheck
//
//  Created by Andrew Toulouse on 5/23/14.
//  Copyright (c) 2014 Andrew Toulouse. All rights reserved.
//

#import "Foo.h"

static NSString const *aConst1 = @"ASDF";
static NSString const *aConst2 = @"ASDF";
NSString *aConst3 = @"ASDF";


@implementation Foo

+ (void)load
{
    NSLog(@"aConst1: %p aConst2: %p aConst3: %p", aConst1, aConst2, aConst3);
}

@end

main.m

//
//  main.m
//  InternCheck
//
//  Created by Andrew Toulouse on 5/23/14.
//  Copyright (c) 2014 Andrew Toulouse. All rights reserved.
//

#import <Foundation/Foundation.h>

static NSString const *aConst4 = @"ASDF";
static NSString const *aConst5 = @"ASDF";

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

    @autoreleasepool {
        NSLog(@"aConst4: %p aConst5: %p", aConst4, aConst5);
        
    }
    return 0;
}

Output:

2014-05-23 01:41:29.715 InternCheck[8312:303] aConst1: 0x100001168 aConst2: 0x100001168 aConst3: 0x100001168
2014-05-23 01:41:29.717 InternCheck[8312:303] aConst4: 0x100001168 aConst5: 0x100001168
Program ended with exit code: 0