From cc7c710fb003da5ec02c2cf8dce653e7618f9b51 Mon Sep 17 00:00:00 2001
From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Sat, 16 Jun 2012 21:48:23 +0000
Subject: [PATCH] Guard private fields that are unused in Release builds with
 #ifndef NDEBUG.

llvm-svn: 158609
---
 clang/include/clang/Frontend/ASTUnit.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/include/clang/Frontend/ASTUnit.h b/clang/include/clang/Frontend/ASTUnit.h
index 041eabb5b992..c22a18bd1c03 100644
--- a/clang/include/clang/Frontend/ASTUnit.h
+++ b/clang/include/clang/Frontend/ASTUnit.h
@@ -396,7 +396,9 @@ private:
   /// just about any usage.
   /// Becomes a noop in release mode; only useful for debug mode checking.
   class ConcurrencyState {
+#ifndef NDEBUG
     void *Mutex; // a llvm::sys::MutexImpl in debug;
+#endif
 
   public:
     ConcurrencyState();