xref: /llvm-project/clang/test/SemaObjC/block-capture-unused-variable.m (revision 22db4824b9e03fe8c2e9217d6832b71ac23c175f)
1// RUN: %clang_cc1 -triple x86_64-apple-macos11 -fsyntax-only -fobjc-arc -fblocks -verify -Wunused-but-set-variable -Wno-objc-root-class %s
2
3typedef struct dispatch_queue_s *dispatch_queue_t;
4
5typedef void (^dispatch_block_t)(void);
6
7void dispatch_async(dispatch_queue_t queue, dispatch_block_t block);
8
9extern __attribute__((visibility("default"))) struct dispatch_queue_s _dispatch_main_q;
10
11id getFoo(void);
12
13@protocol P
14
15@end
16
17@interface I
18
19@end
20
21void test(void) {
22  // no diagnostics
23  __block id x = getFoo();
24  __block id<P> y = x;
25  __block I *z = (I *)x;
26  // diagnose non-block variables
27  id x2 = getFoo(); // expected-warning {{variable 'x2' set but not used}}
28  dispatch_async(&_dispatch_main_q, ^{
29    x = ((void *)0);
30    y = x;
31    z = ((void *)0);
32  });
33  x2 = getFoo();
34}
35