commit 0e0b27a589680e10e38a26575ad4dba8f3af2ec6
Author: hasufell <hasufell@gentoo.org>
Date:   Fri Jul 19 18:50:19 2013 +0200

    add option to explicitly control sse2 optimization

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 78bb3c6..d5f4576 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -86,6 +86,7 @@
 #-----------------------------------------------------------------------------
 # Load some macros.
 include(build_files/cmake/macros.cmake)
+include(CMakeDependentOption)
 
 
 #-----------------------------------------------------------------------------
@@ -251,6 +252,7 @@
 # Misc
 option(WITH_INPUT_NDOF "Enable NDOF input devices (SpaceNavigator and friends)" ON)
 option(WITH_RAYOPTIMIZATION	"Enable use of SIMD (SSE) optimizations for the raytracer" ON)
+cmake_dependent_option(WITH_SSE2 "SSE2 optimizations" ON WITH_RAYOPTIMIZATION OFF)
 option(WITH_OPENNL        "Enable use of Open Numerical Library" ON)
 if(UNIX AND NOT APPLE)
 	option(WITH_INSTALL_PORTABLE "Install redistributeable runtime, otherwise install into CMAKE_INSTALL_PREFIX" ON)
@@ -1950,7 +1952,7 @@
 		set(PLATFORM_CFLAGS " ${COMPILER_SSE_FLAG} ${PLATFORM_CFLAGS}")
 		add_definitions(-D__SSE__ -D__MMX__)
 	endif()
-	if(SUPPORT_SSE2_BUILD)
+	if(WITH_SSE2 AND SUPPORT_SSE2_BUILD)
 		set(PLATFORM_CFLAGS " ${COMPILER_SSE2_FLAG} ${PLATFORM_CFLAGS}")
 		add_definitions(-D__SSE2__)
 		if(NOT SUPPORT_SSE_BUILD) # dont double up