From 697cad702719b80e16fd10aef418eaec80b424b9 Mon Sep 17 00:00:00 2001
From: maurice barnum <msb@yahoo-inc.com>
Date: Thu, 11 Feb 2016 00:03:53 +0000
Subject: [PATCH] fix gcc-4.4 build: -Werror=unused-result is not supported

---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 511860802..e8449caa8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,7 +81,11 @@ if(APPLE)
     "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++ -Wall -pedantic -Werror -Wextra")
 elseif(CMAKE_COMPILER_IS_GNUCXX)
   set(CMAKE_CXX_FLAGS
-    "${CMAKE_CXX_FLAGS} -std=c++0x -Wall -pedantic -Werror -Wextra -Werror=shadow -Wunused-result -Werror=unused-result")
+    "${CMAKE_CXX_FLAGS} -std=c++0x -Wall -pedantic -Werror -Wextra -Werror=shadow")
+  if (GCC_VERSION VERSION_GREATER 4.4)
+    set(CMAKE_CXX_FLAGS
+      "${CMAKE_CXX_FLAGS} -Wunused-result -Werror=unused-result")
+  endif()
 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
   set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -std=c++0x -stdlib=libc++ -Wall -pedantic -Werror -Wextra")