1 // RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -Wno-c++1y-extensions -verify %s 2 template<typename T> void f() { 3 T t; 4 t = 17; 5 } 6 7 // PR5407 8 struct A { A(); }; 9 struct B { ~B(); }; 10 void f() { 11 A a; 12 B b; 13 } 14 15 // PR5531 16 namespace PR5531 { 17 struct A { 18 }; 19 20 struct B { 21 B(int); 22 }; 23 24 struct C { 25 ~C(); 26 }; 27 28 void test() { 29 A(); 30 B(17); 31 C(); 32 } 33 } 34 35 template<typename T> 36 struct X0 { }; 37 38 template<typename T> 39 void test_dependent_init(T *p) { 40 X0<int> i(p); 41 (void)i; 42 } 43 44 void unused_local_static() { 45 static int x = 0; 46 static int y = 0; // expected-warning{{unused variable 'y'}} 47 #pragma unused(x) 48 } 49 50 // PR10168 51 namespace PR10168 { 52 // We expect a warning in the definition only for non-dependent variables, and 53 // a warning in the instantiation only for dependent variables. 54 template<typename T> 55 struct S { 56 void f() { 57 int a; // expected-warning {{unused variable 'a'}} 58 T b; // expected-warning 2{{unused variable 'b'}} 59 } 60 }; 61 62 template<typename T> 63 void f() { 64 int a; // expected-warning {{unused variable 'a'}} 65 T b; // expected-warning 2{{unused variable 'b'}} 66 } 67 68 void g() { 69 S<int>().f(); // expected-note {{here}} 70 S<char>().f(); // expected-note {{here}} 71 f<int>(); // expected-note {{here}} 72 f<char>(); // expected-note {{here}} 73 } 74 } 75 76 namespace PR11550 { 77 struct S1 { 78 S1(); 79 }; 80 S1 makeS1(); 81 void testS1(S1 a) { 82 // This constructor call can be elided. 83 S1 x = makeS1(); // expected-warning {{unused variable 'x'}} 84 85 // This one cannot, so no warning. 86 S1 y; 87 88 // This call cannot, but the constructor is trivial. 89 S1 z = a; // expected-warning {{unused variable 'z'}} 90 } 91 92 // The same is true even when we know thet constructor has side effects. 93 void foo(); 94 struct S2 { 95 S2() { 96 foo(); 97 } 98 }; 99 S2 makeS2(); 100 void testS2(S2 a) { 101 S2 x = makeS2(); // expected-warning {{unused variable 'x'}} 102 S2 y; 103 S2 z = a; // expected-warning {{unused variable 'z'}} 104 } 105 106 // Or when the constructor is not declared by the user. 107 struct S3 { 108 S1 m; 109 }; 110 S3 makeS3(); 111 void testS3(S3 a) { 112 S3 x = makeS3(); // expected-warning {{unused variable 'x'}} 113 S3 y; 114 S3 z = a; // expected-warning {{unused variable 'z'}} 115 } 116 } 117 118 namespace PR19305 { 119 template<typename T> int n = 0; // no warning 120 int a = n<int>; 121 122 template<typename T> const int l = 0; // no warning 123 int b = l<int>; 124 125 // PR19558 126 template<typename T> const int o = 0; // no warning 127 template<typename T> const int o<T*> = 0; // no warning 128 int c = o<int*>; 129 130 template<> int o<void> = 0; // no warning 131 int d = o<void>; 132 133 // FIXME: It'd be nice to warn here. 134 template<typename T> int m = 0; 135 template<typename T> int m<T*> = 0; 136 137 template<> const int m<void> = 0; // expected-warning {{unused variable}} 138 } 139 140 namespace ctor_with_cleanups { 141 struct S1 { 142 ~S1(); 143 }; 144 struct S2 { 145 S2(const S1&); 146 }; 147 void func() { 148 S2 s((S1())); 149 } 150 } 151 152 #include "Inputs/warn-unused-variables.h" 153
