================
@@ -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();
----------------
Decodetalkers wrote:

getValue return the const char* and getAsString return it as string. But I do 
not want to make a clone of the value, I can get the information after using 
llvm::join, so I do not need to clone the data here, I think it is safe to use 
the char * here

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