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Date: Fri, 19 Mar 2021 09:44:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99664

            Bug ID: 99664
           Summary: Overriding virtual function with different return type
                    (and not covariant) is allowed to compiled, when it
                    shouldn=E2=80=99t be
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ricardojvsilva10 at gmail dot com
  Target Milestone: ---

Test sammple code:

struct Res { };

struct A {
    virtual Res &&foo() &&;
};

struct B : A {
    Res &foo() && override; // allowed to compile by gcc, not by clang and =
MSVC=20
};

In the previous test case, overriding virtual function A::foo with different
return type and not covariant from 'A::foo' is allowed and is succefully
compiled, when it shouldn=E2=80=99t be.


- Test sample: https://godbolt.org/z/1E98j9=20


- Relevant standard entry [class.virtual] 11.7.3 - 7.1

https://timsong-cpp.github.io/cppwp/class.virtual#7.1=