public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope
@ 2023-08-23 9:16 fchelnokov at gmail dot com
2023-08-23 17:59 ` [Bug c++/111113] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: fchelnokov at gmail dot com @ 2023-08-23 9:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
Bug ID: 111113
Summary: Cannot define friend function of a local class in
namespace scope
Product: gcc
Version: 13.2.1
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 defines friend function of a local class in namespace scope:
auto foo() {
struct A;
void bar(const A&);
struct A {
friend void bar(const A&);
};
bar(A{});
return A{};
}
using A = decltype(foo());
void bar(const A&) {}
Both Clang and MSVC permit it, but GCC prints weird errors:
<source>:5:21: error: 'void bar(const foo()::A&)', declared using local type
'const foo()::A', is used but never defined [-fpermissive]
5 | friend void bar(const A&);
| ^~~
<source>:5:21: error: 'void bar(const foo()::A&)' used but never defined
<source>:12:6: warning: 'void bar(const A&)' defined but not used
Online demo: https://godbolt.org/z/Yqoeda94x
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/111113] Cannot define friend function of a local class in namespace scope
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
@ 2023-08-23 17:59 ` pinskia at gcc dot gnu.org
2023-08-23 18:05 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-23 17:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2023-08-23
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
Another testcase which might show what is really going on:
```
auto foo() {
struct A;
void bar(const A&);
struct A {
friend void bar(const A&);
};
bar(A{});
return A{};
}
using A = decltype(foo());
void bar(const A&) {}
int main()
{
bar(foo());
}
```
We get the following error message:
```
<source>: In function 'int main()':
<source>:16:12: error: call of overloaded 'bar(foo()::A)' is ambiguous
16 | bar(foo());
| ~~~^~~~~~~
<source>:12:6: note: candidate: 'void bar(const A&)'
12 | void bar(const A&) {}
| ^~~
<source>:5:21: note: candidate: 'void bar(const foo()::A&)'
5 | friend void bar(const A&);
| ^~~
```
Which is not correct as bar in this case is the same bar.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/111113] Cannot define friend function of a local class in namespace scope
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
2023-08-23 17:59 ` [Bug c++/111113] " pinskia at gcc dot gnu.org
@ 2023-08-23 18:05 ` pinskia at gcc dot gnu.org
2023-08-23 18:10 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-23 18:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=51757
Known to fail| |4.8.1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> Confirmed.
>
> Another testcase which might show what is really going on:
...
> Which is not correct as bar in this case is the same bar.
The ambiguous error message was added in GCC 11.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/111113] Cannot define friend function of a local class in namespace scope
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
2023-08-23 17:59 ` [Bug c++/111113] " pinskia at gcc dot gnu.org
2023-08-23 18:05 ` pinskia at gcc dot gnu.org
@ 2023-08-23 18:10 ` pinskia at gcc dot gnu.org
2023-08-23 18:16 ` pinskia at gcc dot gnu.org
2023-08-23 23:30 ` language.lawyer at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-23 18:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=101356
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think this is a dup of bug 101356.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/111113] Cannot define friend function of a local class in namespace scope
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
` (2 preceding siblings ...)
2023-08-23 18:10 ` pinskia at gcc dot gnu.org
@ 2023-08-23 18:16 ` pinskia at gcc dot gnu.org
2023-08-23 23:30 ` language.lawyer at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-23 18:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #3)
> I think this is a dup of bug 101356.
Well at least it is a related issue; maybe not a dup.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/111113] Cannot define friend function of a local class in namespace scope
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
` (3 preceding siblings ...)
2023-08-23 18:16 ` pinskia at gcc dot gnu.org
@ 2023-08-23 23:30 ` language.lawyer at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: language.lawyer at gmail dot com @ 2023-08-23 23:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111113
Language Lawyer <language.lawyer at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |language.lawyer at gmail dot com
--- Comment #5 from Language Lawyer <language.lawyer at gmail dot com> ---
(In reply to Andrew Pinski from comment #3)
> I think this is a dup of bug 101356.
Looks dup to me too. Looks like GCC does not match friend function declaration
with its namespace declaration.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2023-08-23 23:30 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-08-23 9:16 [Bug c++/111113] New: Cannot define friend function of a local class in namespace scope fchelnokov at gmail dot com
2023-08-23 17:59 ` [Bug c++/111113] " pinskia at gcc dot gnu.org
2023-08-23 18:05 ` pinskia at gcc dot gnu.org
2023-08-23 18:10 ` pinskia at gcc dot gnu.org
2023-08-23 18:16 ` pinskia at gcc dot gnu.org
2023-08-23 23:30 ` language.lawyer at gmail dot com
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).