From dd059bb29fcfacc0000443f1ebf03a9cd61ac482 Mon Sep 17 00:00:00 2001
From: Marcus Larsson <mlarsson@openjdk.org>
Date: Wed, 11 Nov 2015 15:45:17 +0100
Subject: [PATCH] 8142483: Unified logging log instances cause warnings on
 windows when only static functions are used

Reviewed-by: brutisso, sla
---
 hotspot/src/share/vm/logging/log.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hotspot/src/share/vm/logging/log.hpp b/hotspot/src/share/vm/logging/log.hpp
index 2f041afeb78..bcd6cde58b4 100644
--- a/hotspot/src/share/vm/logging/log.hpp
+++ b/hotspot/src/share/vm/logging/log.hpp
@@ -88,6 +88,11 @@ class Log VALUE_OBJ_CLASS_SPEC {
   // is not __NO_TAG, the number of tags given exceeds the maximum allowed.
   STATIC_ASSERT(GuardTag == LogTag::__NO_TAG); // Number of logging tags exceeds maximum supported!
 
+  // Empty constructor to avoid warnings on MSVC about unused variables
+  // when the log instance is only used for static functions.
+  Log() {
+  }
+
   static bool is_level(LogLevelType level) {
     return LogTagSetMapping<T0, T1, T2, T3, T4>::tagset().is_level(level);
   }