[clang] [OpenMP 6.0] Parse/Sema support for reduction over private variable with reduction clause. (PR #129938)

[CHANDRA GHALE via cfe-commits]

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@@ -18933,12 +18945,35 @@ static bool actOnOMPReductionKindClause(
         reportOriginalDsa(S, Stack, D, DVar);
         continue;
       }
+      // OpenMP 6.0 [ 7.6.10 ]
+      // Support Reduction over private variables with reduction clause.
+      // A list item in a reduction clause can now be private in the enclosing
+      // context. For orphaned constructs it is assumed to be shared unless the
+      // original(private) modifier appears in the clause.
+      DVar = Stack->getImplicitDSA(D, true);
+      bool IsOrphaned = false;
+      OpenMPDirectiveKind CurrDir = Stack->getCurrentDirective();
+      OpenMPDirectiveKind ParentDir = Stack->getParentDirective();
+      // Check if the construct is orphaned (has no enclosing OpenMP context)
+      IsOrphaned = (ParentDir == OMPD_unknown);
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chandraghale wrote:

done

https://github.com/llvm/llvm-project/pull/129938