From e22be59f82caf3bdad0d083a6b25bd983c600171 Mon Sep 17 00:00:00 2001
From: Tillmann Karras <tilkax@gmail.com>
Date: Sat, 3 May 2014 11:54:31 +0200
Subject: [PATCH] Fix LTO with GCC 4.9

For LTO to work, GCC 4.9 requires using the wrappers gcc-ar and gcc-ranlibs:
http://gcc.gnu.org/gcc-4.9/changes.html

CMake doesn't account for this yet:
http://public.kitware.com/pipermail/cmake-developers/2014-January/009344.html
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f1f5f42adc..22cd38286c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -209,6 +209,10 @@ endif()
 
 if(ENABLE_LTO)
 	check_and_add_flag(LTO -flto)
+	if(CMAKE_CXX_COMPILER_ID STREQUAL GNU)
+		set(CMAKE_AR gcc-ar)
+		set(CMAKE_RANLIB gcc-ranlib)
+	endif()
 endif()
 
 if(APPLE)