Index: lld/COFF/Driver.cpp
===================================================================
--- lld/COFF/Driver.cpp
+++ lld/COFF/Driver.cpp
@@ -19,6 +19,7 @@
 #include "lld/Common/Args.h"
 #include "lld/Common/Driver.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Exit.h"
 #include "lld/Common/Memory.h"
 #include "lld/Common/Timer.h"
 #include "lld/Common/Version.h"
Index: lld/Common/CMakeLists.txt
===================================================================
--- lld/Common/CMakeLists.txt
+++ lld/Common/CMakeLists.txt
@@ -5,6 +5,7 @@
 add_lld_library(lldCommon
   Args.cpp
   ErrorHandler.cpp
+  Exit.cpp
   Memory.cpp
   Reproduce.cpp
   Strings.cpp
Index: lld/Common/ErrorHandler.cpp
===================================================================
--- lld/Common/ErrorHandler.cpp
+++ lld/Common/ErrorHandler.cpp
@@ -9,19 +9,15 @@
 
 #include "lld/Common/ErrorHandler.h"
 
+#include "lld/Common/Exit.h"
 #include "lld/Common/Threads.h"
 
 #include "llvm/ADT/Twine.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/DiagnosticPrinter.h"
-#include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/raw_ostream.h"
 #include <mutex>
 
-#if !defined(_MSC_VER) && !defined(__MINGW32__)
-#include <unistd.h>
-#endif
-
 using namespace llvm;
 using namespace lld;
 
@@ -46,20 +42,6 @@
   return Handler;
 }
 
-void lld::exitLld(int Val) {
-  // Delete the output buffer so that any tempory file is deleted.
-  errorHandler().OutputBuffer.reset();
-
-  // Dealloc/destroy ManagedStatic variables before calling
-  // _exit(). In a non-LTO build, this is a nop. In an LTO
-  // build allows us to get the output of -time-passes.
-  llvm_shutdown();
-
-  outs().flush();
-  errs().flush();
-  _exit(Val);
-}
-
 void lld::diagnosticHandler(const DiagnosticInfo &DI) {
   SmallString<128> S;
   raw_svector_ostream OS(S);
Index: lld/Common/Exit.cpp
===================================================================
--- /dev/null
+++ lld/Common/Exit.cpp
@@ -0,0 +1,51 @@
+//===- Exit.cpp - Exiting LLD -----------------------------------*- C++ -*-===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lld/Common/Exit.h"
+
+#include "lld/Common/ErrorHandler.h"
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/raw_ostream.h"
+
+#include <functional>
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#endif
+
+using namespace llvm;
+
+namespace {
+SmallVector<std::function<void()>, 4> ExitHandlers;
+} // anonymous namespace
+
+namespace lld {
+void addLldExitHandler(std::function<void()> &&Handler) {
+  ExitHandlers.push_back(Handler);
+}
+
+void exitLld(int Val) {
+  for (auto I = ExitHandlers.rbegin(); I != ExitHandlers.rend(); ++I)
+    (*I)();
+
+  // Delete the output buffer so that any tempory file is deleted.
+  errorHandler().OutputBuffer.reset();
+
+  // Dealloc/destroy ManagedStatic variables before calling
+  // _exit(). In a non-LTO build, this is a nop. In an LTO
+  // build allows us to get the output of -time-passes.
+  llvm_shutdown();
+
+  outs().flush();
+  errs().flush();
+  _exit(Val);
+}
+} // namespace lld
Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -41,6 +41,7 @@
 #include "lld/Common/Args.h"
 #include "lld/Common/Driver.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Exit.h"
 #include "lld/Common/Memory.h"
 #include "lld/Common/Strings.h"
 #include "lld/Common/TargetOptionsCommandFlags.h"
Index: lld/include/lld/Common/ErrorHandler.h
===================================================================
--- lld/include/lld/Common/ErrorHandler.h
+++ lld/include/lld/Common/ErrorHandler.h
@@ -117,8 +117,6 @@
 inline void warn(const Twine &Msg) { errorHandler().warn(Msg); }
 inline uint64_t errorCount() { return errorHandler().ErrorCount; }
 
-LLVM_ATTRIBUTE_NORETURN void exitLld(int Val);
-
 void diagnosticHandler(const llvm::DiagnosticInfo &DI);
 void checkError(Error E);
 
Index: lld/include/lld/Common/Exit.h
===================================================================
--- /dev/null
+++ lld/include/lld/Common/Exit.h
@@ -0,0 +1,35 @@
+//===- Exit.h - Exiting LLD -------------------------------------*- C++ -*-===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// In LLD, we use the exitLld() function instead of exit(). This saves time
+// by not running most destructors.
+//
+// Because in rare cases we do want some code to run on exit, we also define
+// an interface for registering such code.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLD_COMMON_EXIT_H
+#define LLD_COMMON_EXIT_H
+
+#include "llvm/Support/Compiler.h"
+
+#include <functional>
+
+namespace lld {
+
+/// Registers a function to be called when LLD exits.
+/// Functions are called in reverse order of registration.
+void addLldExitHandler(std::function<void()> &&Handler);
+
+LLVM_ATTRIBUTE_NORETURN void exitLld(int Val);
+
+} // namespace lld
+
+#endif
Index: lld/lib/Driver/DarwinLdDriver.cpp
===================================================================
--- lld/lib/Driver/DarwinLdDriver.cpp
+++ lld/lib/Driver/DarwinLdDriver.cpp
@@ -15,6 +15,7 @@
 
 #include "lld/Common/Args.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Exit.h"
 #include "lld/Common/LLVM.h"
 #include "lld/Core/ArchiveLibraryFile.h"
 #include "lld/Core/Error.h"
Index: lld/wasm/Driver.cpp
===================================================================
--- lld/wasm/Driver.cpp
+++ lld/wasm/Driver.cpp
@@ -16,6 +16,7 @@
 #include "Writer.h"
 #include "lld/Common/Args.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Exit.h"
 #include "lld/Common/Memory.h"
 #include "lld/Common/Strings.h"
 #include "lld/Common/Threads.h"