Index: ELF/DriverUtils.cpp
===================================================================
--- ELF/DriverUtils.cpp
+++ ELF/DriverUtils.cpp
@@ -17,6 +17,7 @@
 #include "Error.h"
 #include "lld/Config/Version.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
@@ -49,19 +50,38 @@
 
 ELFOptTable::ELFOptTable() : OptTable(OptInfo) {}
 
+static cl::TokenizerCallback getQuotingStyle(opt::InputArgList &Args) {
+  if (auto *Arg = Args.getLastArg(OPT_rsp_quoting)) {
+    StringRef S = Arg->getValue();
+    if (S != "windows" && S != "posix")
+      error("invalid response file quoting: " + S);
+    if (S == "windows")
+      return cl::TokenizeWindowsCommandLine;
+    return cl::TokenizeGNUCommandLine;
+  }
+   if (Triple(sys::getProcessTriple()).getOS() == Triple::Win32)
+    return cl::TokenizeWindowsCommandLine;
+  return cl::TokenizeGNUCommandLine;
+}
+
 // Parses a given list of options.
 opt::InputArgList ELFOptTable::parse(ArrayRef<const char *> Argv) {
   // Make InputArgList from string vectors.
   unsigned MissingIndex;
   unsigned MissingCount;
+  SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
+
+  // We need to get the quoting style for response files before parsing all
+  // options so we parse here before and ignore all the options but
+  // --rsp-quoting.
+  opt::InputArgList Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
 
   // Expand response files. '@<filename>' is replaced by the file's contents.
-  SmallVector<const char *, 256> Vec(Argv.data(), Argv.data() + Argv.size());
   StringSaver Saver(Alloc);
-  cl::ExpandResponseFiles(Saver, cl::TokenizeGNUCommandLine, Vec);
+  cl::ExpandResponseFiles(Saver, getQuotingStyle(Args), Vec);
 
   // Parse options and then do error checking.
-  opt::InputArgList Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
+  Args = this->ParseArgs(Vec, MissingIndex, MissingCount);
   if (MissingCount)
     error(Twine("missing arg value for \"") + Args.getArgString(MissingIndex) +
           "\", expected " + Twine(MissingCount) +
Index: ELF/Options.td
===================================================================
--- ELF/Options.td
+++ ELF/Options.td
@@ -156,6 +156,9 @@
 def unresolved_symbols: J<"unresolved-symbols=">,
   HelpText<"Determine how to handle unresolved symbols">;
 
+def rsp_quoting: J<"rsp-quoting=">,
+  HelpText<"Quoting style for response files. Values supported: windows|posix">;
+
 def verbose: F<"verbose">, HelpText<"Verbose mode">;
 
 def version: F<"version">, HelpText<"Display the version number">;
Index: test/ELF/basic.s
===================================================================
--- test/ELF/basic.s
+++ test/ELF/basic.s
@@ -184,12 +184,23 @@
 # CHECK-NEXT:   }
 # CHECK-NEXT: ]
 
-# Test for the response file
+# Test for the response file (POSIX quoting style)
 # RUN: echo " -o %t2" > %t.responsefile
-# RUN: ld.lld %t @%t.responsefile
+# RUN: ld.lld %t --rsp-quoting=posix @%t.responsefile
 # RUN: llvm-readobj -file-headers -sections -program-headers -symbols %t2 \
 # RUN:   | FileCheck %s
 
+# Test for the response file (Windows quoting style)
+# RUN: echo " c:\blah\foo" > %t.responsefile
+# RUN: not ld.lld --rsp-quoting=windows %t @%t.responsefile 2>&1 | FileCheck \
+# RUN:   %s --check-prefix=WINRSP
+# WINRSP: cannot open c:\blah\foo
+
+# Test for the response file (invalid quoting style)
+# RUN: not ld.lld --rsp-quoting=patatino %t 2>&1 | FileCheck %s \
+# RUN:   --check-prefix=INVRSP
+# INVRSP: invalid response file quoting: patatino
+
 # RUN: not ld.lld %t.foo -o %t2 2>&1 | \
 # RUN:  FileCheck --check-prefix=MISSING %s
 # MISSING: cannot open {{.*}}.foo: {{[Nn]}}o such file or directory