diff -r b9cd87da3211 -r 931247e90857 src/hotspot/cpu/x86/crc32c.h
--- a/src/hotspot/cpu/x86/crc32c.h	Fri Mar 22 12:49:33 2019 +0100
+++ b/src/hotspot/cpu/x86/crc32c.h	Fri Mar 22 09:05:06 2019 -0400
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,9 @@
 *
 */
 
+#ifndef CPU_X86_CRC32C_H
+#define CPU_X86_CRC32C_H
+
 enum {
   // S. Gueron / Information Processing Letters 112 (2012) 184
   // shows than anything above 6K and below 32K is a good choice
@@ -64,3 +67,5 @@
 // a) constants table generation (hotspot/src/cpu/x86/vm/stubRoutines_x86.cpp)
 // b) constant fetch from that table (macroAssembler_x86.cpp)
 // c) unrolled for loop (macroAssembler_x86.cpp)
+
+#endif /* !CPU_X86_CRC32C_H */