| // PR c++/54021 |
| // { dg-do compile { target c++11 } } |
| |
| extern int nonconst_func(int); |
| constexpr int identity(int x) { return x; } |
| constexpr int zero() { return identity(0); } |
| constexpr int one() { return identity(1); } |
| |
| // These are the same. Only the latter is accepted, though. |
| constexpr int rejected_const_4(int x) |
| { return __builtin_constant_p(x) ? 4 : nonconst_func(x); } |
| constexpr int accepted_const_4(int x) |
| { return identity(__builtin_constant_p(x)) ? 4 : nonconst_func(x); } |
| |
| // This is rejected. I would like it to work. |
| constexpr int four = accepted_const_4(1); |
