| Issue |
168579
|
| Summary |
[libc++] Accepts invalid `struct _Atomic(T)` because `_Atomic` expands to a class template
|
| Labels |
libc++
|
| Assignees |
|
| Reporter |
eisenwave
|
https://godbolt.org/z/qeGE8YxzM
```cpp
#include <stdatomic.h>
struct _Atomic(int) x;
```
This code should raise an error (or warning), but is falsely accepted by Clang.
https://eel.is/c++draft/stdatomic.h.syn specifies _Atomic as expanding to an expositon-only *`std-atomic`* alias template. This forbids the use of a `struct` keyword.
The bug occurs because libc++ defines `_Atomic` along the lines of:
```cpp
#define _Atomic(_Tp) ::std::atomic<_Tp>
```
See also https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122738
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