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comparison gcc/testsuite/g++.dg/cpp0x/constexpr-arith-overflow2.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++/70507 - integer overflow builtins not constant expressions
2 // The constexpr-arith-overflow.C testcase covers this for C++14 and later.
3 // { dg-do compile }
4 // { dg-options "-std=c++11" }
5
6 #define Assert(expr) static_assert ((expr), #expr)
7
8 template <class T>
9 constexpr T add (T x, T y, T z = T ())
10 {
11 return __builtin_add_overflow (x, y, &z) ? 0 : z; // { dg-error "is not a constant expression" }
12 }
13
14 template <class T>
15 constexpr T sub (T x, T y, T z = T ())
16 {
17 return __builtin_sub_overflow (x, y, &z) ? 0 : z; // { dg-error "is not a constant expression" }
18 }
19
20 template <class T>
21 constexpr T mul (T x, T y, T z = T ())
22 {
23 return __builtin_mul_overflow (x, y, &z) ? 0 : z; // { dg-error "is not a constant expression" }
24 }
25
26 Assert (0 == add<int>(0, 0)); // { dg-error "non-constant condition for static assertion" }
27 Assert (0 == sub<int>(0, 0)); // { dg-error "non-constant condition for static assertion" }
28 Assert (0 == mul<int>(0, 0)); // { dg-error "non-constant condition for static assertion" }
29 // { dg-message "expansion of" "" { target *-*-* } .-3 }
30 // { dg-message "expansion of" "" { target *-*-* } .-3 }
31 // { dg-message "expansion of" "" { target *-*-* } .-3 }