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From: "kacper.slominski72 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107512] New: Defaulted virtual destructor not considered in
 constexpr context
Date: Wed, 02 Nov 2022 20:36:24 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: kacper.slominski72 at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107512

            Bug ID: 107512
           Summary: Defaulted virtual destructor not considered in
                    constexpr context
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kacper.slominski72 at gmail dot com
  Target Milestone: ---

The following code causes a compiler error on GCC 12.2 and godbolt's trunk
(compiled with "-std=3Dc++20 -Wall -Wextra -Wpedantic"):

struct base {
    constexpr virtual ~base() =3D default;
};

struct derived final : base {
    constexpr virtual ~derived() =3D default;
};

constexpr derived der;

The reported error is:

<source>:9:19: error: 'virtual constexpr derived::~derived()' used before i=
ts
definition
    9 | constexpr derived der;
      |                   ^~~

Changing the destructor to the following makes the error go away:

    constexpr virtual ~derived() { }

As does making the variable not constexpr. Clang seems to accept this witho=
ut
any problems.=