https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113748
Bug ID: 113748
Summary: GCC rejects valid program involving befriending class
with name same as typedef
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following program is rejected by gcc and clang.
https://godbolt.org/z/3K31ev4YT
```
#include <iostream>
#include <type_traits>
class A {
};
class B {
using C = A;
friend class C; //gcc and clang rejects this but msvc accepts
};
```
GCC says:
```
<source>:11:18: error: using typedef-name 'using B::C = class A' after 'class'
11 | friend class C; //gcc and clang rejects this but msvc accepts
| ^
<source>:8:11: note: 'using B::C = class A' has a previous declaration here
8 | using C = A;
| ^
<source>:11:5: error: friend declaration does not name a class or function
11 | friend class C; //gcc and clang rejects this but msvc accepts
| ^~~~~~
Compiler returned: 1
```
This should be valid because `friend class C;` befriend a global class named
`C`.
