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 }
32