================
@@ -273,6 +273,21 @@ void CommandMangler::operator()(tooling::CompileCommand 
&Command,
       SawInput(Cmd[I]);
     Cmd.resize(DashDashIndex);
   }
+
+  llvm::SmallVector<const char *, 16> UnsupportedArgs;
+
+  for (auto *UnknownArg : ArgList.filtered(options::OPT_UNKNOWN)) {
+    unsigned Index = UnknownArg->getIndex();
+    const auto *Argument = UnknownArg->getValue();
+    UnsupportedArgs.push_back(Argument);
+    IndicesToDrop.push_back(Index);
+  }
+
+  if (!UnsupportedArgs.empty()) {
+    std::string UnsupportedArguments = llvm::join(UnsupportedArgs, ", ");
+    log("Warning: detected unsupported Flags {0}", UnsupportedArguments);
----------------
Decodetalkers wrote:

done, and now I also added the unit test, but I do not know if it will work..

https://github.com/llvm/llvm-project/pull/200001
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