From d4e07a8459dc16c3c397f7794818f62b4d23ac57 Mon Sep 17 00:00:00 2001
From: Aaron Gao <gzh@fb.com>
Date: Thu, 12 Jan 2017 12:26:39 -0800
Subject: [PATCH] fix warning of unused direct io helper functions

Summary:
add build guard
Closes https://github.com/facebook/rocksdb/pull/1771

Differential Revision: D4410779

Pulled By: siying

fbshipit-source-id: 3796c30
---
 util/io_posix.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/util/io_posix.cc b/util/io_posix.cc
index eb8287708..021ea71cf 100644
--- a/util/io_posix.cc
+++ b/util/io_posix.cc
@@ -50,6 +50,7 @@ int Fadvise(int fd, off_t offset, size_t len, int advice) {
 /*
  * DirectIOHelper
  */
+#ifndef NDEBUG
 namespace {
 const size_t kSectorSize = 512;
 #ifdef OS_LINUX
@@ -66,6 +67,7 @@ static bool IsPageAligned(const void* ptr) {
 }
 
 }
+#endif
 
 /*
  * PosixSequentialFile