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From: "rs2740 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/116636] New: Deprecation warning/unavailable error when
 overriding member of virtual base class
Date: Fri, 06 Sep 2024 21:01:02 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 15.0
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X-Bugzilla-Severity: normal
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D116636

            Bug ID: 116636
           Summary: Deprecation warning/unavailable error when overriding
                    member of virtual base class
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rs2740 at gmail dot com
  Target Milestone: ---

Repro:

struct B {
    virtual void f() =3D 0;
};
struct C : virtual B {
    [[deprecated("meow")]]
    void f() override {}
};

<source>:6:24: warning: 'virtual void C::f()' is deprecated: meow
[-Wdeprecated-declarations]
    6 |     void f() override {}
      |                        ^
<source>:6:10: note: declared here
    6 |     void f() override {}
      |          ^

Likewise:

struct B {
    virtual void f() =3D 0;
};
struct C : virtual B {
    [[gnu::unavailable("meow")]]
    void f() override {}
};

<source>:6:24: error: 'virtual void C::f()' is unavailable: meow
    6 |     void f() override {}
      |                        ^
<source>:6:10: note: declared here
    6 |     void f() override {}
      |          ^


Making the base class non-virtual makes the warning/error go away.=