From c8626dff3fedd86cf697e49aec00c9e17c9015d8 Mon Sep 17 00:00:00 2001
From: Zachary Michaels <mikezackles@gmail.com>
Date: Wed, 11 Jun 2014 13:13:43 -0400
Subject: [PATCH] Gcc 4.9 LTO fix

The new lto format requires use of the gcc-provided gcc-ar and
gcc-ranlib binaries.
---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28130e566..8b1e61a51 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,11 @@ else()
   else()
     set(WARNINGS "${WARNINGS} -Wlogical-op -Wno-error=maybe-uninitialized")
   endif()
+  # Since gcc 4.9 the LTO format is non-standard (slim), so we need the gcc-specific ar and ranlib binaries
+  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9.0))
+    set(CMAKE_AR "gcc-ar")
+    set(CMAKE_RANLIB "gcc-ranlib")
+  endif()
   if(MINGW)
     set(WARNINGS "${WARNINGS} -Wno-error=unused-value")
     set(MINGW_FLAG "-DWIN32_LEAN_AND_MEAN")