https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98712
Bug ID: 98712
Summary: Incorrect defaulted operator== at compile time and
runtime when declared constexpr and inheriting
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ryan_greenblatt at brown dot edu
Target Milestone: ---
```
struct IntHolder {
int v;
bool operator==(const IntHolder &) const = default;
};
struct Inherits : IntHolder {
// without constexpr here the issue goes away...
constexpr bool operator==(const Inherits &) const = default;
};
#if 0
static_assert(Inherits{1} != Inherits{2});
#else
#include <iostream>
int main() {
// should output true...
volatile int l = 1;
std::cout << std::boolalpha << (Inherits{l} != Inherits{2}) << std::endl;
}
#endif
```
https://godbolt.org/z/145dbq
