| Issue |
145712
|
| Summary |
counted_by cannot be used with C23 attribute syntax
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
tavianator
|
[The docs](https://clang.llvm.org/docs/AttributeReference.html#counted-by-counted-by-or-null-sized-by-sized-by-or-null) claim that `counted_by` has a C23 attribute syntax equivalent of `[[clang::counted_by(...)]]`. However:
```console
tavianator@graphene$ cat foo.c
struct foo {
int n;
int a[] [[clang::counted_by(n)]];
};
struct bar {
int n;
int a[] __attribute__((counted_by(n)));
};
tavianator@graphene$ clang -fsyntax-only foo.c
foo.c:3:12: error: 'counted_by' attribute cannot be applied to types
3 | int a[] [[clang::counted_by(n)]];
| ^
1 error generated.
tavianator@graphene$ clang -v
clang version 20.1.6
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/15.1.1
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/15.1.1
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/15.1.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
```
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