https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107652
Bug ID: 107652
Summary: c++20 gccchoses incorrect operator== overload
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tiagomacarios at gmail dot com
Target Milestone: ---
In C++20 gcc will chose the incorrect overload for this code. The overload
should be ambiguous (see msvc).
https://godbolt.org/z/rox1z1Txa
```
namespace N {
struct C;
struct B;
struct A {
bool fun(A, B, C);
bool operator==(A const&) const;
bool operator!=(A const&) const;
};
struct B : A {};
struct C : A {
bool operator==(C const&) const;
bool operator!=(C const&) const;
C(const B&);
};
} // namespace N
namespace N {
bool A::fun(A a, B b, C c) { return b == c; }
} // namespace N
```
