Index: lib/sanitizer_common/sanitizer_common.h
===================================================================
--- lib/sanitizer_common/sanitizer_common.h
+++ lib/sanitizer_common/sanitizer_common.h
@@ -440,6 +440,12 @@
 uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
                       string_predicate_t filter);
 
+#if SANITIZER_POSIX
+const uptr kPthreadDestructorIterations = 4;
+#else
+// Unused on Windows.
+const uptr kPthreadDestructorIterations = 0;
+#endif
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_COMMON_H
Index: lib/sanitizer_common/sanitizer_linux.h
===================================================================
--- lib/sanitizer_common/sanitizer_linux.h
+++ lib/sanitizer_common/sanitizer_linux.h
@@ -76,9 +76,6 @@
 
 // Call cb for each region mapped by map.
 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
-
-// PTHREAD_DESTRUCTOR_ITERATIONS from glibc.
-const uptr kPthreadDestructorIterations = 4;
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_LINUX
Index: lib/sanitizer_common/sanitizer_platform_limits_posix.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -15,6 +15,7 @@
 #ifndef SANITIZER_PLATFORM_LIMITS_POSIX_H
 #define SANITIZER_PLATFORM_LIMITS_POSIX_H
 
+#include "sanitizer_internal_defs.h"
 #include "sanitizer_platform.h"
 
 namespace __sanitizer {
@@ -821,6 +822,7 @@
   extern unsigned IOCTL_TIOCSERSETMULTI;
   extern unsigned IOCTL_TIOCSSERIAL;
 #endif
+
 }  // namespace __sanitizer
 
 #endif
Index: lib/sanitizer_common/tests/CMakeLists.txt
===================================================================
--- lib/sanitizer_common/tests/CMakeLists.txt
+++ lib/sanitizer_common/tests/CMakeLists.txt
@@ -11,6 +11,7 @@
   sanitizer_list_test.cc
   sanitizer_mutex_test.cc
   sanitizer_nolibc_test.cc
+  sanitizer_posix_test.cc
   sanitizer_printf_test.cc
   sanitizer_scanf_interceptor_test.cc
   sanitizer_stackdepot_test.cc
Index: lib/sanitizer_common/tests/sanitizer_linux_test.cc
===================================================================
--- lib/sanitizer_common/tests/sanitizer_linux_test.cc
+++ lib/sanitizer_common/tests/sanitizer_linux_test.cc
@@ -255,42 +255,6 @@
     }
 }
 
-static pthread_key_t key;
-static bool destructor_executed;
-
-extern "C"
-void destructor(void *arg) {
-  uptr iter = reinterpret_cast<uptr>(arg);
-  if (iter > 1) {
-    ASSERT_EQ(0, pthread_setspecific(key, reinterpret_cast<void *>(iter - 1)));
-    return;
-  }
-  destructor_executed = true;
-}
-
-extern "C"
-void *thread_func(void *arg) {
-  return reinterpret_cast<void*>(pthread_setspecific(key, arg));
-}
-
-static void SpawnThread(uptr iteration) {
-  destructor_executed = false;
-  pthread_t tid;
-  ASSERT_EQ(0, pthread_create(&tid, 0, &thread_func,
-                              reinterpret_cast<void *>(iteration)));
-  void *retval;
-  ASSERT_EQ(0, pthread_join(tid, &retval));
-  ASSERT_EQ(0, retval);
-}
-
-TEST(SanitizerCommon, PthreadDestructorIterations) {
-  ASSERT_EQ(0, pthread_key_create(&key, &destructor));
-  SpawnThread(kPthreadDestructorIterations);
-  EXPECT_TRUE(destructor_executed);
-  SpawnThread(kPthreadDestructorIterations + 1);
-  EXPECT_FALSE(destructor_executed);
-}
-
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_LINUX
Index: lib/sanitizer_common/tests/sanitizer_posix_test.cc
===================================================================
--- /dev/null
+++ lib/sanitizer_common/tests/sanitizer_posix_test.cc
@@ -0,0 +1,62 @@
+//===-- sanitizer_posix_test.cc -------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Tests for POSIX-specific code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_platform.h"
+#if SANITIZER_POSIX
+
+#include "sanitizer_common/sanitizer_common.h"
+#include "gtest/gtest.h"
+
+#include <pthread.h>
+
+namespace __sanitizer {
+
+static pthread_key_t key;
+static bool destructor_executed;
+
+extern "C"
+void destructor(void *arg) {
+  uptr iter = reinterpret_cast<uptr>(arg);
+  if (iter > 1) {
+    ASSERT_EQ(0, pthread_setspecific(key, reinterpret_cast<void *>(iter - 1)));
+    return;
+  }
+  destructor_executed = true;
+}
+
+extern "C"
+void *thread_func(void *arg) {
+  return reinterpret_cast<void*>(pthread_setspecific(key, arg));
+}
+
+static void SpawnThread(uptr iteration) {
+  destructor_executed = false;
+  pthread_t tid;
+  ASSERT_EQ(0, pthread_create(&tid, 0, &thread_func,
+                              reinterpret_cast<void *>(iteration)));
+  void *retval;
+  ASSERT_EQ(0, pthread_join(tid, &retval));
+  ASSERT_EQ(0, retval);
+}
+
+TEST(SanitizerCommon, PthreadDestructorIterations) {
+  ASSERT_EQ(0, pthread_key_create(&key, &destructor));
+  SpawnThread(kPthreadDestructorIterations);
+  EXPECT_TRUE(destructor_executed);
+  SpawnThread(kPthreadDestructorIterations + 1);
+  EXPECT_FALSE(destructor_executed);
+}
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_POSIX