[clang] default clause replaced by otherwise clause for metadirective in OpenMP 5.2 (PR #128640)

[Urvi Rav via cfe-commits]

================
@@ -2759,6 +2759,19 @@ StmtResult 
Parser::ParseOpenMPDeclarativeOrExecutableDirective(
       OpenMPClauseKind CKind = Tok.isAnnotation()
                                    ? OMPC_unknown
                                    : getOpenMPClauseKind(PP.getSpelling(Tok));
+      // Check if the clause is unrecognized.
+      if (getLangOpts().OpenMP < 52 &&
+          (CKind == OMPC_unknown || CKind == OMPC_otherwise)) {
+        Diag(Tok, diag::err_omp_unknown_clause)
+            << PP.getSpelling(Tok) << "metadirective";
+      }
+      if (getLangOpts().OpenMP >= 52 && CKind == OMPC_unknown) {
+        Diag(Tok, diag::err_omp_unknown_clause)
+            << PP.getSpelling(Tok) << "metadirective";
+      }
----------------
ravurvi20 wrote:

ping @kparzysz 

https://github.com/llvm/llvm-project/pull/128640
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