[clang] [OpenACC] Implement Sema work for OpenACC Clauses (PR #87821)

[Alexey Bataev via cfe-commits]

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@@ -37,6 +37,32 @@ bool diagnoseConstructAppertainment(SemaOpenACC &S, OpenACCDirectiveKind K,
   }
   return false;
 }
+
+bool doesClauseApplyToDirective(OpenACCDirectiveKind DirectiveKind,
+                                OpenACCClauseKind ClauseKind) {
+  switch (ClauseKind) {
+    // FIXME: For each clause as we implement them, we can add the
+    // 'legalization' list here.
+  default:
+    // Do nothing so we can go to the 'unimplemented' diagnostic instead.
+    return true;
+  }
+  llvm_unreachable("Invalid clause kind");
+}
+
+/// Destruct and deallocate any clauses that aren't going to be used because
+/// they don't have a Construct to attach to.
+void DestroyUnusedClauses(ASTContext &Ctx,
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alexey-bataev wrote:

Not sure this is a real issue. I think it is enough just to report the error (or warning) and just ignore the clauses in the codegen.

https://github.com/llvm/llvm-project/pull/87821