Exploring the 'atomic' keyword in properties.

atomic.m

#import <Foundation/Foundation.h>

// clang -g -Wall -framework Foundation -o atomic atomic.m
// gcc -g -Wall -framework Foundation -o atomic atomic.m

@interface Blah : NSObject
@property (assign, NS_NONATOMIC_IOSONLY) NSInteger frobnozzle;
@property (assign, ) NSInteger commaAtEnd;
// @property (, assign) NSInteger commaAtBeginning;  // Syntax error
@property (atomic, assign) NSInteger blah; // complains in gcc
@end

@implementation Blah

#define GET_WARNING 0
#if GET_WARNING
- (NSInteger) blah {
    return _blah;
} // blah
#endif

@end


int main (void) {
    return 0;
} // main