| Issue |
120875
|
| Summary |
Clang (C23): Attributes with unknown "attribute-prefix" should not raise "-Wunknown-attributes"
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
namandixit
|
With `--std=c23`, when using attributes with an arbitrary `attribute-prefix`, Clang raises the warning `-Wunknown-attributes` as shown below.
```sh
$ cat test.c
[[cthrough::hello(bye((no)) go(away((please)))), cthrough::alvida(la la la la)]]
int main (void)
{
return 3;
}
$
$
$ clang --std=c23 test.c -o exe
test.c:1:3: warning: unknown attribute 'hello' ignored [-Wunknown-attributes]
1 | [[cthrough::hello(bye((no)) go(away((please)))), cthrough::alvida(la la la la)]]
| ^~~~~~~~~~~~~~~
test.c:1:50: warning: unknown attribute 'alvida' ignored [-Wunknown-attributes]
1 | [[cthrough::hello(bye((no)) go(away((please)))), cthrough::alvida(la la la la)]]
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
The whole point of `attribute-prefix`s is to be able to use attributes for multiple compilers without a `#ifdef`-hell. Thus, there is no reason for this warning to be raised. And if a warning has to be raised, it should be a different one (perhaps `-Wunknown-attribute-prefix`) such that it can selectively be disabled (since `-Wunknown-attributes` is useful in case of misspelled attributes in general).
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