https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111690
Bug ID: 111690
Summary: Redefinition of operator == not detected with friend
<=>
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: antoshkka at gmail dot com
Target Milestone: ---
Consider the example:
```
#include <compare>
struct Foo {
friend auto operator<=>(const Foo&, const Foo&) = default;
};
bool operator==(const Foo& x, const Foo& y) noexcept {
return true;
}
void Test() {
Foo{} == Foo{};
}
```
If my reading of [class.compare.default] p4 correct, then an == operator
function is already declared implicitly due to operator<=>.
So there should be an error of redeclaring or redefining the operator==.
Godbolt playground: https://godbolt.org/z/YP5vEMeYs
