[driver] Enable response file when using lld on baremetal targets

[phosek]

Summary

This patch enables response file support when using lld on baremetal targets

[phosek]

I think we can enable the use of response files unconditionally since it should be supported by all officially supported linkers. This matches the logic used by other driver classes such as Gnu.

[phosek]

Addressed by D148760.

clang/lib/Driver/ToolChains/BareMetal.cpp

void baremetal::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   }
 
   if (TC.getTriple().isRISCV())
     CmdArgs.push_back("-X");
 
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
 
-  C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
+  const char *Linker = Args.MakeArgString(TC.GetLinkerPath());
+  ResponseFileSupport LinkerResponseFileSupport = ResponseFileSupport::AtFileCurCP();
+  if (llvm::sys::path::filename(Linker) != "ld.lld" &&
+      llvm::sys::path::stem(Linker) != "ld.lld") {
+        LinkerResponseFileSupport = ResponseFileSupport::None();
+  }
+
+  C.addCommand(std::make_unique<Command>(JA, *this, LinkerResponseFileSupport,
                                          Args.MakeArgString(TC.GetLinkerPath()),
                                          CmdArgs, Inputs, Output));
 }