https://bugs.llvm.org/show_bug.cgi?id=52186
Bug ID: 52186
Summary: False acceptance of ambiguity in case of multiple
inheritance and spaceship operator
Product: clang
Version: 12.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++2b
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
The program as follows is accepted in Clang:
```
#include <compare>
struct A {
auto operator <=>(const A&) const = default;
bool operator <(const A&) const = default;
};
struct B {
auto operator <=>(const B&) const = default;
};
struct C : A, B {};
int main() {
C c;
return c < c;
}
```
Demo: https://gcc.godbolt.org/z/5YzvqT3aK
But it shall be an error (as in GCC) due to ambiguity. A more detailed
explanation can be found in this answer:
https://stackoverflow.com/a/69245639/7325599
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