Index: ELF/Config.h
===================================================================
--- ELF/Config.h
+++ ELF/Config.h
@@ -48,6 +48,7 @@
   llvm::StringRef SoName;
   llvm::StringRef Sysroot;
   std::string RPath;
+  std::string Reproduce;
   std::vector<llvm::StringRef> DynamicList;
   std::vector<llvm::StringRef> SearchPaths;
   std::vector<llvm::StringRef> Undefined;
Index: ELF/Driver.cpp
===================================================================
--- ELF/Driver.cpp
+++ ELF/Driver.cpp
@@ -19,6 +19,7 @@
 #include "Writer.h"
 #include "lld/Driver/Driver.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/raw_ostream.h"
 #include <utility>
@@ -97,12 +98,33 @@
   return V;
 }
 
+static void dumpFile(StringRef SrcPath) {
+  std::error_code EC;
+
+  SmallString<128> DirName;
+  llvm::sys::path::append(DirName, Config->Reproduce, llvm::sys::path::parent_path(SrcPath));
+  EC = llvm::sys::fs::create_directories(DirName);
+  if (EC) {
+    error("--reproduce: can't create directory " + DirName  + ": " + EC.message());
+    return;
+  }
+
+  SmallString<128> DestPathName;
+  llvm::sys::path::append(DestPathName, Config->Reproduce, SrcPath);
+  EC = llvm::sys::fs::copy_file(SrcPath, DestPathName);
+  if (EC)
+    error("--reproduce: can't copy file " + SrcPath + ": " + EC.message());
+}
+
 // Opens and parses a file. Path has to be resolved already.
 // Newly created memory buffers are owned by this driver.
 void LinkerDriver::addFile(StringRef Path) {
   using namespace llvm::sys::fs;
   if (Config->Verbose)
     llvm::outs() << Path << "\n";
+  if (!Config->Reproduce.empty())
+    dumpFile(Path);
+
   Optional<MemoryBufferRef> Buffer = readFile(Path);
   if (!Buffer.hasValue())
     return;
@@ -223,6 +245,21 @@
   return false;
 }
 
+static void dumpLinkerInvocation(ArrayRef<const char *> Args) {
+  std::error_code EC = llvm::sys::fs::create_directories(Config->Reproduce);
+  if (EC) {
+    error("--reproduce: can't create directory.");
+    return;
+  }
+
+  raw_fd_ostream OS(Config->Reproduce + "/invocation.txt", EC,
+    sys::fs::OpenFlags::F_None);
+  check(EC);
+  for (const char *Arg: Args)
+    OS << Arg << " ";
+  OS << "\n";
+}
+
 void LinkerDriver::main(ArrayRef<const char *> ArgsArr) {
   ELFOptTable Parser;
   opt::InputArgList Args = Parser.parse(ArgsArr.slice(1));
@@ -237,6 +274,10 @@
 
   initLLVM(Args);
   readConfigs(Args);
+
+  if (!Config->Reproduce.empty())
+    dumpLinkerInvocation(ArgsArr);
+
   createFiles(Args);
   checkOptions(Args);
   if (HasError)
@@ -378,6 +419,12 @@
     if (Optional<MemoryBufferRef> Buffer =
             readFile(getString(Args, OPT_version_script)))
       parseVersionScript(*Buffer);
+
+  if (auto *Arg = Args.getLastArg(OPT_reproduce)) {
+    Config->Reproduce = Arg->getValue();
+    if (llvm::sys::fs::exists(Config->Reproduce))
+      error("--reproduce: directory " + Config->Reproduce + " already exists.");
+  }
 }
 
 void LinkerDriver::createFiles(opt::InputArgList &Args) {
Index: ELF/Options.td
===================================================================
--- ELF/Options.td
+++ ELF/Options.td
@@ -120,6 +120,9 @@
 def print_gc_sections: Flag<["--"], "print-gc-sections">,
   HelpText<"List removed unused sections">;
 
+def reproduce : Separate<["--"], "reproduce">,
+  HelpText<"Dump linker invocation and input files for debugging">;
+
 def rpath : Separate<["-"], "rpath">,
   HelpText<"Add a DT_RUNPATH to the output">;