================
@@ -760,8 +760,9 @@ KEYWORD(__builtin_available              , KEYALL)
 KEYWORD(__builtin_sycl_unique_stable_name, KEYSYCL)
 
 // Keywords defined by Attr.td.
+// The "EMPTY ## X" is used to prevent early macro-expansion of the keyword.
 #ifndef KEYWORD_ATTRIBUTE
-#define KEYWORD_ATTRIBUTE(X, ...) KEYWORD(X, KEYALL)
+#define KEYWORD_ATTRIBUTE(X, HASARG, EMPTY) KEYWORD(EMPTY ## X, KEYALL)
----------------
sdesmalen-arm wrote:

I see, thanks for sharing the example.

https://github.com/llvm/llvm-project/pull/78704
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