https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102258
Bug ID: 102258
Summary: dynamic_cast to derived type fails during constant
evaluation
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: johelegp at gmail dot com
CC: johelegp at gmail dot com
Target Milestone: ---
See https://godbolt.org/z/dsEzaxW47.
```C++
struct B { virtual ~B() = default; };
struct D : B { constexpr ~D() override { } };
int main() {
[]() consteval {
B* b = new D;
dynamic_cast<D&>(*b);
delete b;
}();
}
```
```
<source>: In function 'int main()':
<source>:8:4: in 'constexpr' expansion of '<lambda closure
object>main()::<lambda()>().main()::<lambda()>()'
<source>:6:5: error: reference 'dynamic_cast' failed
6 | dynamic_cast<D&>(*b);
| ^~~~~~~~~~~~~~~~~~~~
<source>:6:5: note: dynamic type 'D [1]' of its operand does not have a base
class of type 'D'
Compiler returned: 1
```
