diff -Naur xtensor-0.21.7.orig/test/CMakeLists.txt xtensor-0.21.7/test/CMakeLists.txt
--- xtensor-0.21.7.orig/test/CMakeLists.txt	2020-10-05 07:58:59.898264285 +0000
+++ xtensor-0.21.7/test/CMakeLists.txt	2020-10-07 06:49:04.566990256 +0000
@@ -63,7 +63,7 @@
 endif()
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR (CMAKE_CXX_COMPILER_ID MATCHES "Intel" AND NOT WIN32))
-  if(NOT CMAKE_CXX_FLAGS MATCHES "-march")
+  if(NOT CMAKE_CXX_FLAGS MATCHES "-march" AND NOT CMAKE_CXX_FLAGS MATCHES "-mcpu")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
   endif()
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_cxx_std_flag} -Wunused-parameter -Wextra -Wreorder -Wconversion -Wsign-conversion")
@@ -83,7 +83,7 @@
   endif()
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   if(NOT WIN32)
-    if(NOT CMAKE_CXX_FLAGS MATCHES "-march")
+    if(NOT CMAKE_CXX_FLAGS MATCHES "-march" AND NOT CMAKE_CXX_FLAGS MATCHES "-mcpu")
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
     endif()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_cxx_std_flag} -Wunused-parameter -Wextra -Wreorder -Wconversion -Wsign-conversion")