================
@@ -1049,6 +1049,7 @@ Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
 
   case tok::kw_extern:
     if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
+      ProhibitAttributes(Attrs);
----------------
AaronBallman wrote:

I think it's reasonable to reject all attributes.

> ALSO: I checked and this should only prevent regular keywords-as-attributes, 
> which seem to only be ARM based ones, so this won't affect things like 
> __alignas or calling conventions/etc.

 @erichkeane I don't follow this comment. I think we should reject all 
attributes, not keywords implemented as an attribute. Right?

https://github.com/llvm/llvm-project/pull/136328
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