https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108966
Bug ID: 108966 Summary: Inheriting consteval constructor makes it constexpr in the derived class Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: g...@arne-mertz.de Target Milestone: --- Consider the following code: ``` struct X { consteval X(int) {}; }; struct T : X { using X::X; }; constexpr T t(22); ``` The using directive (1) should lead to a `consteval T::T(int)`. However, the compiler errors with message ``` <source>: In constructor 'constexpr T::T(double&&) [inherited from X]': <source>:8:14: error: 'this' is not a constant expression 8 | using X::X; ``` This indicates that the inherited constructor is considered `constexpr` instead of `consteval` and is therefore unable to call the `consteval` base class constructor. See it in action: https://godbolt.org/z/K6T6f1691 Note: - this does not happen when the constructor is replaced with `X::X() = default` and no initializer is given to `t`, but a similar error appears with `X::X() {}`