153 lines
3.1 KiB
C++
153 lines
3.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -verify %s
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template<typename T> void f() {
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T t;
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t = 17;
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}
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// PR5407
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struct A { A(); };
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struct B { ~B(); };
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void f() {
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A a;
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B b;
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}
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// PR5531
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namespace PR5531 {
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struct A {
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};
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struct B {
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B(int);
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};
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struct C {
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~C();
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};
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void test() {
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A();
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B(17);
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C();
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}
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}
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template<typename T>
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struct X0 { };
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template<typename T>
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void test_dependent_init(T *p) {
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X0<int> i(p);
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(void)i;
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}
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void unused_local_static() {
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static int x = 0;
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static int y = 0; // expected-warning{{unused variable 'y'}}
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#pragma unused(x)
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}
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// PR10168
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namespace PR10168 {
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// We expect a warning in the definition only for non-dependent variables, and
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// a warning in the instantiation only for dependent variables.
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template<typename T>
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struct S {
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void f() {
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int a; // expected-warning {{unused variable 'a'}}
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T b; // expected-warning 2{{unused variable 'b'}}
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}
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};
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template<typename T>
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void f() {
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int a; // expected-warning {{unused variable 'a'}}
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T b; // expected-warning 2{{unused variable 'b'}}
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}
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void g() {
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S<int>().f(); // expected-note {{here}}
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S<char>().f(); // expected-note {{here}}
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f<int>(); // expected-note {{here}}
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f<char>(); // expected-note {{here}}
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}
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}
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namespace PR11550 {
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struct S1 {
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S1();
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};
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S1 makeS1();
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void testS1(S1 a) {
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// This constructor call can be elided.
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S1 x = makeS1(); // expected-warning {{unused variable 'x'}}
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// This one cannot, so no warning.
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S1 y;
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// This call cannot, but the constructor is trivial.
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S1 z = a; // expected-warning {{unused variable 'z'}}
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}
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// The same is true even when we know thet constructor has side effects.
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void foo();
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struct S2 {
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S2() {
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foo();
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}
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};
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S2 makeS2();
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void testS2(S2 a) {
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S2 x = makeS2(); // expected-warning {{unused variable 'x'}}
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S2 y;
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S2 z = a; // expected-warning {{unused variable 'z'}}
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}
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// Or when the constructor is not declared by the user.
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struct S3 {
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S1 m;
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};
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S3 makeS3();
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void testS3(S3 a) {
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S3 x = makeS3(); // expected-warning {{unused variable 'x'}}
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S3 y;
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S3 z = a; // expected-warning {{unused variable 'z'}}
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}
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}
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namespace ctor_with_cleanups {
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struct S1 {
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~S1();
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};
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struct S2 {
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S2(const S1&);
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};
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void func() {
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S2 s((S1()));
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}
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}
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#include "Inputs/warn-unused-variables.h"
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namespace PR8455 {
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void f() {
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A: // expected-warning {{unused label 'A'}}
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__attribute__((unused)) int i; // attribute applies to variable
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B: // attribute applies to label
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__attribute__((unused)); int j; // expected-warning {{unused variable 'j'}}
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}
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void g() {
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C: // unused label 'C' will not appear here because an error occurs
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__attribute__((unused))
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#pragma weak unused_local_static // expected-error {{expected ';' after __attribute__}}
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;
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}
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void h() {
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D: // expected-warning {{unused label 'D'}}
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#pragma weak unused_local_static
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__attribute__((unused)) // expected-warning {{declaration does not declare anything}}
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;
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}
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}
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