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152
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1 // { dg-do compile { target c++2a } }
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2 // { dg-options "-Wtautological-compare" }
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3
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4 namespace std {
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5 constexpr inline bool
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6 is_constant_evaluated () noexcept
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7 {
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8 return __builtin_is_constant_evaluated ();
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9 }
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10 }
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11
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12 template<typename>
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13 constexpr int
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14 foo(int i)
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15 {
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16 if constexpr (std::is_constant_evaluated ()) // { dg-warning ".std::is_constant_evaluated. always evaluates to true in .if constexpr." }
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17 return 42;
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18 else
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19 return i;
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20 }
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21
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22 template<typename>
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23 constexpr int
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24 foo2(int i)
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25 {
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26 if constexpr (__builtin_is_constant_evaluated ()) // { dg-warning ".std::is_constant_evaluated. always evaluates to true in .if constexpr." }
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27 return 42;
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28 else
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29 return i;
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30 }
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