[clang][IFS] Ignoring -Xlinker/-Xclang arguments in InterfaceStubs pass for now.

[plotfi]

Summary

I intend to add something like -Xifs, but for now if an InputArg is not a filename then I want to skip it.

[compnerd]

Could you please provide a proper commit message before committing this? Also -Xifs is actually the inverse of what you want - that would be a set of arguments designed to be passed to llvm-ifs.

clang/lib/Driver/ToolChains/InterfaceStubs.cpp

else
       OutputFilename += (WriteBin ? ".ifso" : ".ifs");
   }
 
   CmdArgs.push_back(Args.MakeArgString(OutputFilename.c_str()));
 
   // Here we append the input files. If the input files are object files, then
   // we look for .ifs files present in the same location as the object files.
   for (const auto &Input : Inputs) {
+    if (!Input.isFilename())
+      continue;
     SmallString<128> InputFilename(Input.getFilename());
     if (Input.getType() == types::TY_Object)
       llvm::sys::path::replace_extension(InputFilename, ".ifs");
     CmdArgs.push_back(Args.MakeArgString(InputFilename.c_str()));
   }
 
   C.addCommand(std::make_unique<Command>(JA, *this, Args.MakeArgString(Merger),
                                          CmdArgs, Inputs));
 }
 } // namespace ifstool
 } // namespace tools
 } // namespace driver
 } // namespace clang

clang/test/InterfaceStubs/XlinkerInputArgs.cpp

+// RUN: %clang -### -Xlinker -Bsymbolic -emit-interface-stubs 2>&1 | FileCheck %s
+// CHECK: Bsymbolic
+// CHECK-NOT: Bsymbolic