From cdf3e21025352cf5dacd741ccfd7cc8476844d4e Mon Sep 17 00:00:00 2001
From: Sam Edwards <CFSworks@gmail.com>
Date: Wed, 11 Nov 2015 14:35:24 -0800
Subject: [PATCH] CMake: Test that the compiler has SSE2 support.

---
 dtool/LocalSetup.cmake            | 4 ++++
 panda/src/pnmimage/CMakeLists.txt | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/dtool/LocalSetup.cmake b/dtool/LocalSetup.cmake
index 9f5fe2ed1e..b5ebc89576 100644
--- a/dtool/LocalSetup.cmake
+++ b/dtool/LocalSetup.cmake
@@ -159,6 +159,10 @@ check_include_file_cxx(typeinfo HAVE_RTTI)
 # Do we have Posix threads?
 #set(HAVE_POSIX_THREADS ${CMAKE_USE_PTHREADS_INIT})
 
+# Do we have SSE2 support?
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-msse2 HAVE_SSE2)
+
 #/* Define if needed to have 64-bit file i/o */
 #$[cdefine __USE_LARGEFILE64]
 
diff --git a/panda/src/pnmimage/CMakeLists.txt b/panda/src/pnmimage/CMakeLists.txt
index 3372d009f1..a813a6fd1e 100644
--- a/panda/src/pnmimage/CMakeLists.txt
+++ b/panda/src/pnmimage/CMakeLists.txt
@@ -30,7 +30,9 @@ set(P3PNMIMAGE_IGATEEXT
   pfmFile_ext.h
 )
 
-set_source_files_properties(convert_srgb_sse2.cxx PROPERTIES COMPILE_FLAGS -msse2)
+if(HAVE_SSE2)
+  set_source_files_properties(convert_srgb_sse2.cxx PROPERTIES COMPILE_FLAGS -msse2)
+endif()
 
 composite_sources(p3pnmimage P3PNMIMAGE_SOURCES)
 add_library(p3pnmimage ${P3PNMIMAGE_HEADERS} ${P3PNMIMAGE_SOURCES} convert_srgb_sse2.cxx)