================
@@ -179,6 +179,8 @@ def err_opencl_unknown_type_specifier : Error<
 
 def warn_unknown_attribute_ignored : Warning<
   "unknown attribute %0 ignored">, InGroup<UnknownAttributes>;
+def ext_unknown_attribute_ignored : Extension<
+  "unknown attribute %0 ignored">, InGroup<UnknownAttributes>;
----------------
erichkeane wrote:

I see that, though disagree somewhat.  I see value in it being a separate 
GROUP, but it should still be a warning.  The intent of attributes THEMSELVES 
is to be ignorable without #ifdef-hell, so the criticisms against the prefix is 
the same here.

Though note: the intent of the prefixes was NOT actually to avoid #ifdef-hell 
(at least in C++, though it might have been used as side-justification in 
WG14).  The point was to ensure that the 'global' namespace was reserved for 
the standard attributes, and provide an extension point for implementers.

https://github.com/llvm/llvm-project/pull/120925
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