| Issue |
147370
|
| Summary |
[Clang] `typeof(*fixed-type enumeration*)` resolves to the underlying type, unlike GCC
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
fuhsnn
|
https://godbolt.org/z/zce5YzqjY
```C
#include <stdio.h>
int main(void) {
{
enum { A };
enum { B };
printf("%d\n", _Generic( A , typeof(B):1, default:0)); // Both 1
printf("%d\n", _Generic(typeof(A), typeof(B):1, default:0)); // Both 1
}
{
printf("%d\n", _Generic(typeof(enum { A }), typeof(enum { B }):1, default:0)); // Both 0
}
{
enum : int { A };
enum : int { B };
printf("%d\n", _Generic( A , typeof(B):1, default:0)); // Clang: 1, GCC: 0
printf("%d\n", _Generic(typeof(A), typeof(B):1, default:0)); // Clang: 1, GCC: 0
}
{
printf("%d\n", _Generic(typeof(enum : int { A }), typeof(enum : int { B }):1, default:0)); // Both 0
}
}
```
It seems that GCC treats `typeof` of fixed-type enumerations as `enum : int` and concludes they are not compatible. Clang, on the contrary, sees them as `int` and thus compatible.
I didn't find in n3550 pdf when should fixed-type enumerations drop their "is enum" property, so can't say which is more conformant, though I prefer the Clang behavior as more intuitive.
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