Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_getauxval.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_getauxval.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_getauxval.h
@@ -17,15 +17,10 @@
 #define SANITIZER_GETAUXVAL_H
 
 #include "sanitizer_platform.h"
+#include "sanitizer_glibc_version.h"
 
 #if SANITIZER_LINUX || SANITIZER_FUCHSIA
 
-# include <features.h>
-
-# ifndef __GLIBC_PREREQ
-#  define __GLIBC_PREREQ(x, y) 0
-# endif
-
 # if __GLIBC_PREREQ(2, 16) || (SANITIZER_ANDROID && __ANDROID_API__ >= 21) || \
      SANITIZER_FUCHSIA
 #  define SANITIZER_USE_GETAUXVAL 1
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_glibc_version.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_glibc_version.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_glibc_version.h
@@ -0,0 +1,26 @@
+//===-- sanitizer_glibc_version.h -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of Sanitizer common code.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_GLIBC_VERSION_H
+#define SANITIZER_GLIBC_VERSION_H
+
+#include "sanitizer_platform.h"
+
+#if SANITIZER_LINUX || SANITIZER_FUCHSIA
+#include <features.h>
+#endif
+
+#ifndef __GLIBC_PREREQ
+#define __GLIBC_PREREQ(x, y) 0
+#endif
+
+#endif
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
@@ -23,6 +23,7 @@
 #include "sanitizer_flags.h"
 #include "sanitizer_freebsd.h"
 #include "sanitizer_getauxval.h"
+#include "sanitizer_glibc_version.h"
 #include "sanitizer_linux.h"
 #include "sanitizer_placement_new.h"
 #include "sanitizer_procmaps.h"
@@ -188,11 +189,7 @@
 static uptr g_tls_size;
 
 #ifdef __i386__
-# ifndef __GLIBC_PREREQ
-#  define CHECK_GET_TLS_STATIC_INFO_VERSION 1
-# else
-#  define CHECK_GET_TLS_STATIC_INFO_VERSION (!__GLIBC_PREREQ(2, 27))
-# endif
+# define CHECK_GET_TLS_STATIC_INFO_VERSION (!__GLIBC_PREREQ(2, 27))
 #else
 # define CHECK_GET_TLS_STATIC_INFO_VERSION 0
 #endif
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -19,12 +19,13 @@
 #include "sanitizer_internal_defs.h"
 #include "sanitizer_platform.h"
 
-# define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) ((link_map*)(handle))
-
-#ifndef __GLIBC_PREREQ
-#define __GLIBC_PREREQ(x, y) 0
+#if defined(__sparc__)
+// FIXME: This can't be included from tsan which does not support sparc yet.
+#include "sanitizer_glibc_version.h"
 #endif
 
+# define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) ((link_map*)(handle))
+
 namespace __sanitizer {
 extern unsigned struct_utsname_sz;
 extern unsigned struct_stat_sz;
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
@@ -22,6 +22,10 @@
 #ifdef _FILE_OFFSET_BITS
 #undef _FILE_OFFSET_BITS
 #endif
+
+// Must go after undef _FILE_OFFSET_BITS.
+#include "sanitizer_glibc_version.h"
+
 #include <arpa/inet.h>
 #include <dirent.h>
 #include <grp.h>
@@ -1005,10 +1009,6 @@
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
 
-#ifndef __GLIBC_PREREQ
-#define __GLIBC_PREREQ(x, y) 0
-#endif
-
 #if SANITIZER_LINUX && (__ANDROID_API__ >= 21 || __GLIBC_PREREQ (2, 14))
 CHECK_TYPE_SIZE(mmsghdr);
 CHECK_SIZE_AND_OFFSET(mmsghdr, msg_hdr);