[Bug c++/110330] New: GCC does not diagnose ambiguous function introduced from base class

[Bug c++/110330] New: GCC does not diagnose ambiguous function introduced from base class

[csaba_22 at yahoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110330

            Bug ID: 110330
           Summary: GCC does not diagnose ambiguous function introduced
                    from base class
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: csaba_22 at yahoo dot co.uk
  Target Milestone: ---

The following code

struct Foo{};
struct Bar{};

struct Base {
    Foo func1(const Foo , const Bar = Bar{}) const {
        return {};
    };
};

struct Derived : public Base {
    using Base::func1;
    Foo func1(const Foo ) const {
        return {};
    };
};

int main() {
    Foo foo;
    Derived der;
    der.func1(foo);
}

is rejected by ICX and clang, but accepted by GCC (up to 13.1).
https://godbolt.org/z/4M3rrs3r4

The consensus at
https://stackoverflow.com/questions/76517300/gcc-does-not-see-function-introduced-from-base-class-as-ambiguous
seems to be that this is a bug.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84832 was shown as a possible
duplicate, although the problem there wasn't ambiguity.

[Bug c++/110330] GCC does not diagnose ambiguous function introduced from base class

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110330

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |82894

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is a dup of bug 82894. Specifically see bug 82894 comment #2 .


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82894
[Bug 82894] [10/11/12/13/14 Regression] Inherited member functions do not
create ambiguity

[Bug c++/110330] GCC does not diagnose ambiguous function introduced from base class

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110330

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I think this is a dup of bug 82894. Specifically see bug 82894 comment #2 .

Yes it is a dup. GCC 6 rejected the code as ambiguous even.

*** This bug has been marked as a duplicate of bug 82894 ***