Handle creation of C++03 flags differently

test/CMakeLists.txt

@@ -3,10 +3,8 @@
 find_package(Threads REQUIRED)
 
 set(CXX03_FLAGS "${CMAKE_CXX_FLAGS}")
-separate_arguments(CXX03_FLAGS)
-list(REMOVE_ITEM CXX03_FLAGS -std=c++11 -std=c++0x)
-list(APPEND CXX03_FLAGS -std=c++03)
-string(REPLACE ";" " " CXX03_FLAGS "${CXX03_FLAGS}")
+string(REPLACE "-std=c++11" "-std=c++03" CXX03_FLAGS "${CXX03_FLAGS}")
+string(REPLACE "-std=c++0x" "-std=c++03" CXX03_FLAGS "${CXX03_FLAGS}")
 
 macro(compile_benchmark_test name)
   add_executable(${name} "${name}.cc")