From af00cd5b753cffadac5b3dc40f32d455a35b1165 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Thu, 7 Jul 2011 22:35:34 +0000
Subject: [PATCH] Disabled -ffast-math in the case of GCC 4.6.x (ticket #1201)

---
 CMakeLists.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3885c23d05..30e8711e9b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -361,7 +361,12 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 
     if(X86 OR X86_64)
         # enable everything, since the available set of instructions is checked at runtime
-        set(USE_FAST_MATH ON CACHE BOOL "Enable -ffast-math")
+        IF ("${CMAKE_GCC_REGEX_VERSION}" VERSION_GREATER 4.6.-1)
+            SET(_USE_FAST_MATH OFF)
+        ELSE()
+            SET(_USE_FAST_MATH ON)
+        ENDIF()
+        set(USE_FAST_MATH ${_USE_FAST_MATH} CACHE BOOL "Enable -ffast-math (not recommended for GCC 4.6.x)")
         set(ENABLE_SSE ON CACHE BOOL "Enable SSE instructions")
         set(ENABLE_SSE2 ON CACHE BOOL "Enable SSE2 instructions")
         set(ENABLE_SSE3 OFF CACHE BOOL "Enable SSE3 instructions")