llvm/clang/test/PCH/Inputs/arc.h

// Header for Objective-C ARC-related PCH tests

typedef const void *CFTypeRef;
typedef const struct __CFString *CFStringRef;

CFTypeRef CFCreateSomething(void);
CFStringRef CFCreateString(void);
CFTypeRef CFGetSomething(void);
CFStringRef CFGetString(void);

@interface NSString
@end

id CreateSomething(void);
NSString *CreateNSString(void);

#if __has_feature(objc_arc)
#define BRIDGE __bridge
#else
#define BRIDGE
#endif

typedef int array0[sizeof((BRIDGE id)CFCreateSomething())];
typedef int array1[sizeof((BRIDGE CFTypeRef)CreateSomething())];