ojhunt wrote:
Right, so in macro expansion we have
```cpp
// If the use of an extension results in an error diagnostic, extensions are
// effectively unavailable, so just return false here.
if (PP.getDiagnostics().getExtensionHandlingBehavior() >=
diag::Severity::Error)
return false;
```
But if you have `-Wno-<some-extension-warning>` the use of the extension would
in principle not generate an warning, and so this would be "ok" and this path
should not have been taken.
https://github.com/llvm/llvm-project/pull/153291
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