| Issue |
150594
|
| Summary |
[clang] Enums differing in underlying type are compatible
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
bolshakov-a
|
The following code is accepted by clang but rejected by GCC (C23 mode):
```cpp
enum E : int {A, B, C};
enum E e;
int main() {
extern enum E Fn();
enum E {A, B, C};
extern enum E Fn();
return __builtin_types_compatible_p(enum E, typeof(e));
}
```
https://godbolt.org/z/Eab5nz3q9
Compiled by clang, it returns 1, whereas if compiled by GCC (provided that the second `Fn()` declaration is removed) it returns 0.
I think GCC behavior is correct because 6.2.7 "Compatible type and composite type" states:
> For two enumerations, ... if one has a fixed underlying type, then the other shall have a compatible fixed underlying type.
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