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comparison gcc/testsuite/g++.dg/cpp1z/constexpr-if31.C @ 145:1830386684a0

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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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131:84e7813d76e9 145:1830386684a0
1 // PR c++/81676 - bogus -Wunused warnings in constexpr if.
2 // { dg-do compile { target c++17 } }
3 // { dg-options "-Wall -Wextra" }
4
5 template <typename T> int
6 f1 (T v)
7 {
8 T x = 0;
9 if constexpr(sizeof(T) == sizeof(int))
10 return v + x;
11 else
12 return 0;
13 }
14
15 template <typename T> int
16 f2 (T v) // { dg-warning "unused parameter .v." }
17 {
18 T x = 0;
19 if constexpr(sizeof(T) == sizeof(int))
20 return x;
21 else
22 return 0;
23 }
24
25 template <typename T> int
26 f3 (T v)
27 {
28 T x = 0; // { dg-warning "unused variable .x." }
29 if constexpr(sizeof(T) == sizeof(int))
30 return v;
31 else
32 return 0;
33 }
34
35 template <typename T> int
36 f4 (T v)
37 {
38 T x = 0;
39 if constexpr(sizeof(T) == sizeof(int))
40 return 0;
41 else
42 return v + x;
43 }
44
45 template <typename T> int
46 f5 (T v) // { dg-warning "unused parameter .v." }
47 {
48 T x = 0;
49 if constexpr(sizeof(T) == sizeof(int))
50 return 0;
51 else
52 return x;
53 }
54
55 template <typename T> int
56 f6 (T v)
57 {
58 T x = 0; // { dg-warning "unused variable .x." }
59 if constexpr(sizeof(T) == sizeof(int))
60 return 0;
61 else
62 return v;
63 }
64
65 int main()
66 {
67 f1(0);
68 f1('a');
69 f2(0);
70 f2('a');
71 f3(0);
72 f3('a');
73 f4(0);
74 f4('a');
75 f5(0);
76 f5('a');
77 f6(0);
78 f6('a');
79 }