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// RUN: %clang_cc1 -verify -fsyntax-only %s
@class NSString;
extern NSString *fa2 (const NSString *) __attribute__((format_arg(1)));
extern NSString *fa3 (NSString *) __attribute__((format_arg(1)));
extern void fc1 (const NSString *) __attribute__((format_arg)); // expected-error {{attribute takes one argument}}
extern void fc2 (const NSString *) __attribute__((format_arg())); // expected-error {{attribute takes one argument}}
extern void fc3 (const NSString *) __attribute__((format_arg(1, 2))); // expected-error {{attribute takes one argument}}
struct s1 { int i; } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to functions}}
union u1 { int i; } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to functions}}
enum e1 { E1V0 } __attribute__((format_arg(1))); // expected-warning {{'format_arg' attribute only applies to functions}}
extern NSString *ff3 (const NSString *) __attribute__((format_arg(3-2)));
extern NSString *ff4 (const NSString *) __attribute__((format_arg(foo))); // expected-error {{attribute takes one argument}}
/* format_arg formats must take and return a string. */
extern NSString *fi0 (int) __attribute__((format_arg(1))); // expected-error {{format argument not a string type}}
extern NSString *fi1 (NSString *) __attribute__((format_arg(1)));
extern NSString *fi2 (NSString *) __attribute__((format_arg(1)));
extern int fi3 (const NSString *) __attribute__((format_arg(1))); // expected-error {{function does not return NSString}}
extern NSString *fi4 (const NSString *) __attribute__((format_arg(1)));
extern NSString *fi5 (const NSString *) __attribute__((format_arg(1)));
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