| Issue |
184250
|
| Summary |
Diagnostic for __COUNTER__ cannot be reduced to a warning with -Wno-error=c2y-extensions
|
| Labels |
clang:diagnostics
|
| Assignees |
|
| Reporter |
hvdijk
|
```c++
int main() { return __COUNTER__; }
```
Up to Clang 21, this was accepted regardless of options. `__COUNTER__` is in the reserved namespace and no standard requires any diagnostic for the use of it, so that's fine.
As of Clang 22, this gets detected as a c2y extension and flagged by `-pedantic-errors`. This is questionable since previous standards did not mandate a diagnostic, but somewhat understandable. However, it cannot be selectively reduced to a warning: with `-pedantic-errors -Wno-error=c2y-extensions`, this remains an error, when the more specific option `-Wno-error=c2y-extensions` should override `-pedantic-errors`.
https://godbolt.org/z/ePszn7cb7
`-Wno-c2y-extensions` does work to suppress the diagnostic entirely.
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