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