public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/104653] New: Derived class looks for a definition of its inherited constexpr virtual destructor
@ 2022-02-23 7:25 lichray at gmail dot com
2022-02-23 7:46 ` [Bug c++/104653] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: lichray at gmail dot com @ 2022-02-23 7:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104653
Bug ID: 104653
Summary: Derived class looks for a definition of its inherited
constexpr virtual destructor
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lichray at gmail dot com
Target Milestone: ---
The following -std=c++20 code fails to compile:
#include <cstddef>
struct B {
virtual ~B() = default;
};
struct D : B {};
struct C : B {};
bool foo(std::byte *p) {
constexpr D obj;
return __builtin_memcmp(p, &obj, sizeof(void *)) == 0;
}
<source>: In function 'bool foo(std::byte*)':
<source>:12:17: error: 'virtual constexpr D::~D()' used before its definition
12 | constexpr D obj;
| ^~~
The code compiles in MSVC 19.29 and Clang 10.
GCC seems to understand that D inherited a defaulted, constexpr virtual
destructor, but reports that it needs a definition. The problem doesn't arise
if D is dependent. A workaround is the following:
struct D : B {
virtual constexpr ~D() override;
};
constexpr D::~D() = default;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/104653] Derived class looks for a definition of its inherited constexpr virtual destructor
2022-02-23 7:25 [Bug c++/104653] New: Derived class looks for a definition of its inherited constexpr virtual destructor lichray at gmail dot com
@ 2022-02-23 7:46 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-02-23 7:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104653
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 93413.
*** This bug has been marked as a duplicate of bug 93413 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-02-23 7:46 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-23 7:25 [Bug c++/104653] New: Derived class looks for a definition of its inherited constexpr virtual destructor lichray at gmail dot com
2022-02-23 7:46 ` [Bug c++/104653] " pinskia at gcc dot gnu.org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).