[Bug cobol/124601] New: misleading 'alignof' diagnostic for alignas(void)

[yronglin777 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124601

            Bug ID: 124601
           Summary: misleading 'alignof' diagnostic for alignas(void)
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: cobol
          Assignee: unassigned at gcc dot gnu.org
          Reporter: yronglin777 at gmail dot com
  Target Milestone: ---

GCC emit an misleading diagnostic for the following code:

```cpp
class alignas(void) A {};
```

```
<source>:1:15: error: invalid application of 'alignof' to a void type
    1 | class alignas(void) A {};
      |               ^~~~
Compiler returned: 1
```

https://godbolt.org/z/8exT8366c