Index: lib/asan/asan_dll_thunk.cc
===================================================================
--- lib/asan/asan_dll_thunk.cc
+++ lib/asan/asan_dll_thunk.cc
@@ -20,6 +20,7 @@
 // Using #ifdef rather than relying on Makefiles etc.
 // simplifies the build procedure.
 #ifdef ASAN_DLL_THUNK
+#include "asan_init_version.h"
 #include "sanitizer_common/sanitizer_interception.h"
 
 // ---------- Function interception helper functions and macros ----------- {{{1
@@ -203,13 +204,13 @@
 
   // Manually wrap __asan_init as we need to initialize
   // __asan_option_detect_stack_use_after_return afterwards.
-  void __asan_init_v4() {
+  void __asan_init() {
     typedef void (*fntype)();
     static fntype fn = 0;
-    // __asan_init_v4 is expected to be called by only one thread.
+    // __asan_init is expected to be called by only one thread.
     if (fn) return;
 
-    fn = (fntype)getRealProcAddressOrDie("__asan_init_v4");
+    fn = (fntype)getRealProcAddressOrDie(__asan_init_name);
     fn();
     __asan_option_detect_stack_use_after_return =
         (__asan_should_detect_stack_use_after_return() != 0);
@@ -339,7 +340,7 @@
 // In DLLs, the callbacks are expected to return 0,
 // otherwise CRT initialization fails.
 static int call_asan_init() {
-  __asan_init_v4();
+  __asan_init();
   return 0;
 }
 #pragma section(".CRT$XIB", long, read)  // NOLINT
Index: lib/asan/asan_init_version.h
===================================================================
--- /dev/null
+++ lib/asan/asan_init_version.h
@@ -0,0 +1,37 @@
+//===-- asan_init_version.h -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// This header defines a versioned __asan_init function to be called at the
+// startup of the instrumented program.
+//===----------------------------------------------------------------------===//
+#ifndef ASAN_INIT_VERSION_H
+#define ASAN_INIT_VERSION_H
+
+#include "sanitizer_common/sanitizer_internal_defs.h"
+
+extern "C" {
+  // This function should be called at the very beginning of the process,
+  // before any instrumented code is executed and before any call to malloc.
+  // Every time the ASan ABI changes we also change the version number in this
+  // name. Objects build with incompatible ASan ABI version
+  // will not link with run-time.
+  // Changes between ABI versions:
+  // v1=>v2: added 'module_name' to __asan_global
+  // v2=>v3: stack frame description (created by the compiler)
+  //         contains the function PC as the 3-rd field (see
+  //         DescribeAddressIfStack).
+  // v3=>v4: added '__asan_global_source_location' to __asan_global.
+  SANITIZER_INTERFACE_ATTRIBUTE void __asan_init_v4();
+  #define __asan_init __asan_init_v4
+  #define __asan_init_name "__asan_init_v4"
+}
+
+#endif  // ASAN_INIT_VERSION_H
Index: lib/asan/asan_interface_internal.h
===================================================================
--- lib/asan/asan_interface_internal.h
+++ lib/asan/asan_interface_internal.h
@@ -17,23 +17,11 @@
 
 #include "sanitizer_common/sanitizer_internal_defs.h"
 
+#include "asan_init_version.h"
+
 using __sanitizer::uptr;
 
 extern "C" {
-  // This function should be called at the very beginning of the process,
-  // before any instrumented code is executed and before any call to malloc.
-  // Every time the asan ABI changes we also change the version number in this
-  // name. Objects build with incompatible asan ABI version
-  // will not link with run-time.
-  // Changes between ABI versions:
-  // v1=>v2: added 'module_name' to __asan_global
-  // v2=>v3: stack frame description (created by the compiler)
-  //         contains the function PC as the 3-rd field (see
-  //         DescribeAddressIfStack).
-  // v3=>v4: added '__asan_global_source_location' to __asan_global.
-  SANITIZER_INTERFACE_ATTRIBUTE void __asan_init_v4();
-  #define __asan_init __asan_init_v4
-
   // This structure is used to describe the source location of a place where
   // global was defined.
   struct __asan_global_source_location {