Undo changes to cmake

Author: spectre-ns

test/CMakeLists.txt

@@ -62,9 +62,9 @@ OPTION(XTENSOR_ENABLE_WERROR "Turn on -Werror" OFF)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DXSIMD_ENABLE_XTL_COMPLEX=1")
 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR (CMAKE_CXX_COMPILER_ID MATCHES "Intel" AND NOT WIN32))
   CHECK_CXX_COMPILER_FLAG(-march=native arch_native_supported)
-  # if(arch_native_supported AND NOT CMAKE_CXX_FLAGS MATCHES "-march")
-  #   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
-  # endif()
+  if(arch_native_supported AND NOT CMAKE_CXX_FLAGS MATCHES "-march")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
+  endif()
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_cxx_std_flag} -Wunused-parameter -Wextra -Wreorder -Wconversion -Wno-sign-conversion ")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wold-style-cast -Wunused-variable -ftemplate-backtrace-limit=0")
   if (XTENSOR_DISABLE_EXCEPTIONS)