--- old/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.inline.hpp	2018-04-09 14:11:23.774106145 +0200
+++ new/src/hotspot/os_cpu/solaris_x86/os_solaris_x86.inline.hpp	2018-04-09 14:11:23.042059897 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, 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
@@ -27,6 +27,8 @@
 
 #include "runtime/os.hpp"
 
+extern "C" jlong _raw_rdtsc(); // In .il file
+
 inline jlong os::rdtsc() { return _raw_rdtsc(); }
 
 #endif // OS_CPU_SOLARIS_X86_VM_OS_SOLARIS_X86_INLINE_HPP