1 // RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -fexceptions -Wuninitialized-const-reference -verify %s
2
3 class A {
4 public:
5 int i;
A()6 A(){};
A(const A & a)7 A(const A &a){};
A(int i)8 A(int i) {}
9 bool operator!=(const A &);
10 };
11
12 template <class T>
ignore_template(const T &)13 void ignore_template(const T &) {}
ignore(const int & i)14 void ignore(const int &i) {}
dont_ignore_non_empty(const int & i)15 void dont_ignore_non_empty(const int &i) { ; } // Calling this won't silence the warning for you
dont_ignore_block(const int & i)16 void dont_ignore_block(const int &i) {
17 {}
18 } // Calling this won't silence the warning for you
ignore_function_try_block_maybe_who_knows(const int &)19 void ignore_function_try_block_maybe_who_knows(const int &) try {
20 } catch (...) {
21 }
22 A const_ref_use_A(const A &a);
23 int const_ref_use(const int &i);
24 A const_use_A(const A a);
25 int const_use(const int i);
26
f(int a)27 void f(int a) {
28 int i;
29 const_ref_use(i); // expected-warning {{variable 'i' is uninitialized when passed as a const reference argument here}}
30 int j = j + const_ref_use(j); // expected-warning {{variable 'j' is uninitialized when used within its own initialization}} expected-warning {{variable 'j' is uninitialized when passed as a const reference argument here}}
31 A a1 = const_ref_use_A(a1); // expected-warning {{variable 'a1' is uninitialized when passed as a const reference argument here}}
32 int k = const_use(k); // expected-warning {{variable 'k' is uninitialized when used within its own initialization}}
33 A a2 = const_use_A(a2); // expected-warning {{variable 'a2' is uninitialized when used within its own initialization}}
34 A a3(const_ref_use_A(a3)); // expected-warning {{variable 'a3' is uninitialized when passed as a const reference argument here}}
35 A a4 = a3 != a4; // expected-warning {{variable 'a4' is uninitialized when used within its own initialization}} expected-warning {{variable 'a4' is uninitialized when passed as a const reference argument here}}
36 int n = n; // expected-warning {{variable 'n' is uninitialized when used within its own initialization}}
37 const_ref_use(n);
38
39 A a5;
40 const_ref_use_A(a5);
41
42 int m;
43 if (a < 42)
44 m = 1;
45 const_ref_use(m);
46
47 int l;
48 ignore_template(l); // This is a pattern to avoid "unused variable" warnings (e.g. boost::ignore_unused).
49 ignore(l);
50 dont_ignore_non_empty(l); // expected-warning {{variable 'l' is uninitialized when passed as a const reference argument here}}
51 int l1;
52 dont_ignore_block(l1); // expected-warning {{variable 'l1' is uninitialized when passed as a const reference argument here}}
53 int l2;
54 ignore_function_try_block_maybe_who_knows(l2); // expected-warning {{variable 'l2' is uninitialized when passed as a const reference argument here}}
55 }
56