| Issue |
151769
|
| Summary |
New C23 typeof() cannot be used in a `union`.
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
g-berthiaume
|
Hi,
I just encountered what seems to be the same problem as https://github.com/llvm/llvm-project/issues/25689, but with C23 `typeof()` instead of the intrinsics `__typeof__()`.
Let me know if this issue is redundant.
## How to reproduce:
```c
#include <stdlib.h>
int main(void)
{
int x = 3;
struct { typeof((int){x}) y; };
return 0;
}
```
Compile with
```
clang -std=c23 main.c -o main
.\main.c:8:25: error: initializer element is not a compile-time constant
8 | __typeof__((int){x}) y;
| ^~~
1 error generated.
```
The error has been reproduced on Windows:
```
clang version 20.1.8
Target: x86_64-pc-windows-msvc
Thread model: posix
```
The error has been reproduced on Linux (Ubuntu WSL):
```
Ubuntu clang version 18.1.8 (++20240731024944+3b5b5c1ec4a3-1~exp1~20240731145000.144)
Target: x86_64-pc-linux-gnu
Thread model: posix
```
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