1 // RUN: %clang_cc1 -fsyntax-only -verify %s -Wunused-function 2 3 /// We allow 'retain' on non-ELF targets because 'retain' is often used together 4 /// with 'used'. 'used' has GC root semantics on macOS and Windows. We want 5 /// users to just write retain,used and don't need to dispatch on binary formats. 6 7 extern char test1[] __attribute__((retain)); // expected-warning {{'retain' attribute ignored on a non-definition declaration}} 8 extern const char test2[] __attribute__((retain)); // expected-warning {{'retain' attribute ignored on a non-definition declaration}} 9 const char test3[] __attribute__((retain)) = ""; 10 11 struct __attribute__((retain)) s { // expected-warning {{'retain' attribute only applies to variables with non-local storage, functions, and Objective-C methods}} 12 }; 13 foo(void)14void foo(void) { 15 static int a __attribute__((retain)); 16 int b __attribute__((retain)); // expected-warning {{'retain' attribute only applies to variables with non-local storage, functions, and Objective-C methods}} 17 (void)a; 18 (void)b; 19 } 20 f0(void)21__attribute__((retain,used)) static void f0(void) {} f1(void)22__attribute__((retain)) static void f1(void) {} // expected-warning {{unused function 'f1'}} f2(void)23__attribute__((retain)) void f2(void) {} 24 25 /// Test attribute merging. 26 int tentative; 27 int tentative __attribute__((retain)); 28 extern int tentative; 29 int tentative = 0; 30