xref: /llvm-project/clang/test/Sema/warn-unused-function.c (revision 0f1c1be1968076d6f96f8a7bcc4a15cf195ecd97) 
1 // RUN: %clang_cc1 -fsyntax-only -Wused-but-marked-unused -Wunused-function -Wunneeded-internal-declaration -verify %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -Wunused %s
3 // RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-infinite-recursion %s
4 
foo(void)5 void foo(void) {}
f2(void)6 static void f2(void) {}
f1(void)7 static void f1(void) {f2();} // expected-warning{{unused}}
8 
f0(void)9 static int f0(void) { return 17; } // expected-warning{{not needed and will not be emitted}}
10 int x = sizeof(f0());
11 
12 static void f3(void);
f3(void)13 extern void f3(void) { } // expected-warning{{unused}}
14 
15 inline static void f4(void);
f4(void)16 void f4(void) { } // expected-warning{{unused}}
17 
f5(void)18 static void __attribute__((used)) f5(void) {}
19 static void f6(void);
20 static void __attribute__((used)) f6(void);
f6(void)21 static void f6(void) {};
22 
23 static void f7(void);
24 void f8(void(*a0)(void));
f9(void)25 void f9(void) { f8(f7); }
f7(void)26 static void f7(void) {}
27 
28 __attribute__((unused)) static void bar(void);
bar(void)29 void bar(void) { }
30 
31 __attribute__((constructor)) static void bar2(void);
bar2(void)32 void bar2(void) { }
33 
34 __attribute__((destructor)) static void bar3(void);
bar3(void)35 void bar3(void) { }
36 
37 static void f10(void); // expected-warning{{unused}}
38 static void f10(void);
39 
40 static void f11(void);
f11(void)41 static void f11(void) { }  // expected-warning{{unused}}
42 
f12(void)43 static void f12(void) { }  // expected-warning{{unused}}
44 static void f12(void);
45 
46 // PR7923
unused(void)47 static void unused(void) { unused(); }  // expected-warning{{not needed and will not be emitted}}
48 
cleanupMalloc(char * const * const allocation)49 static void cleanupMalloc(char * const * const allocation) { }
f13(void)50 void f13(void) {
51   char * const __attribute__((cleanup(cleanupMalloc))) a;
52   (void)a;
53 }
54 
55 extern void a(void) __attribute__((unused));
56 extern void b(void) __attribute__((unused));
57 
b(void)58 void b(void)
59 {
60 }
a(void)61 void a(void)
62 {
63   b();
64 }
65