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* [Bug c++/116428] New: Redeclaration of explicitly defaulted comparison operator makes it undefined
@ 2024-08-20 9:00 fchelnokov at gmail dot com
2024-08-20 16:01 ` [Bug c++/116428] defaulted friend comparison operator and redeclaration makes it not "defined" pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: fchelnokov at gmail dot com @ 2024-08-20 9:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116428
Bug ID: 116428
Summary: Redeclaration of explicitly defaulted comparison
operator makes it undefined
Product: gcc
Version: 14.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
This program
```
struct A {
friend constexpr bool operator ==(const A &, const A &) noexcept = default;
};
constexpr bool operator ==(const A &, const A &) noexcept;
static_assert( A{} == A{} );
```
looks valid and it is accepted by EDG compiler. But GCC rejects it with the
error
> inline function 'constexpr bool operator==(const A&, const A&)' used but never defined
Clang unfortunately has a similar issue.
Online demo: https://gcc.godbolt.org/z/f5saeGrGM
Related discussion: https://stackoverflow.com/q/78889523/7325599
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/116428] defaulted friend comparison operator and redeclaration makes it not "defined"
2024-08-20 9:00 [Bug c++/116428] New: Redeclaration of explicitly defaulted comparison operator makes it undefined fchelnokov at gmail dot com
@ 2024-08-20 16:01 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-08-20 16:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116428
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Summary|Redeclaration of explicitly |defaulted friend comparison
|defaulted comparison |operator and redeclaration
|operator makes it undefined |makes it not "defined"
Last reconfirmed| |2024-08-20
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. Looks like GCC loses it was defaulted.
having a full definition rather than defaulted allows it to work.
Also note it is only the friend definition which was defaulted where GCC loses
it was defaulted.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-08-20 9:00 [Bug c++/116428] New: Redeclaration of explicitly defaulted comparison operator makes it undefined fchelnokov at gmail dot com
2024-08-20 16:01 ` [Bug c++/116428] defaulted friend comparison operator and redeclaration makes it not "defined" pinskia at gcc dot gnu.org
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