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1// RUN: %clang_cc1 -verify -fsyntax-only %s2 3@interface NSString4+(instancetype)stringWithCString:(const char *)cstr __attribute__((format_arg(1)));5-(instancetype)initWithString:(NSString *)str __attribute__((format_arg(1)));6 7+(instancetype _Nonnull)nonNullableString:(NSString *)str __attribute__((format_arg(1)));8+(instancetype _Nullable)nullableString:(NSString *)str __attribute__((format_arg(1)));9@end10 11@protocol MaybeString12-(instancetype)maybeString:(const char *)cstr __attribute__((format_arg(1))); // expected-error {{function does not return string type}}13@end14 15@class NSAttributedString;16 17extern NSString *fa2 (const NSString *) __attribute__((format_arg(1)));18extern NSString *fa3 (NSString *) __attribute__((format_arg(1)));19 20extern void fc1 (const NSString *) __attribute__((format_arg)); // expected-error {{'format_arg' attribute takes one argument}}21extern void fc2 (const NSString *) __attribute__((format_arg())); // expected-error {{'format_arg' attribute takes one argument}}22extern void fc3 (const NSString *) __attribute__((format_arg(1, 2))); // expected-error {{'format_arg' attribute takes one argument}}23 24struct s1 { int i; } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to Objective-C methods and non-K&R-style functions}}25union u1 { int i; } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to}}26enum e1 { E1V0 } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to}}27 28extern NSString *ff3 (const NSString *) __attribute__((format_arg(3-2)));29extern NSString *ff4 (const NSString *) __attribute__((format_arg(foo))); // expected-error {{use of undeclared identifier 'foo'}}30 31/* format_arg formats must take and return a string. */32extern NSString *fi0 (int) __attribute__((format_arg(1))); // expected-error {{format argument not a string type}}33extern NSString *fi1 (NSString *) __attribute__((format_arg(1))); 34 35extern NSString *fi2 (NSString *) __attribute__((format_arg(1))); 36 37extern int fi3 (const NSString *) __attribute__((format_arg(1))); // expected-error {{function does not return NSString}}38extern NSString *fi4 (const NSString *) __attribute__((format_arg(1))); 39extern NSString *fi5 (const NSString *) __attribute__((format_arg(1))); 40 41extern NSAttributedString *fattrs (const NSString *) __attribute__((format_arg(1)));42