We both want to respect the user's CFLAGS, but also, not all of our arches support
-march or -mtune.
--- a/benchmark/CMakeLists.txt
+++ b/benchmark/CMakeLists.txt
@@ -30,7 +30,6 @@
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Intel")
     if(NOT CMAKE_CXX_FLAGS MATCHES "-march" AND NOT CMAKE_CXX_FLAGS MATCHES "-arch" AND NOT CMAKE_OSX_ARCHITECTURES)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
     endif()
 
     if(NOT MSVC)
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -26,7 +26,6 @@
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Intel")
     if (NOT CMAKE_CXX_FLAGS MATCHES "-march" AND NOT CMAKE_CXX_FLAGS MATCHES "-arch" AND NOT CMAKE_OSX_ARCHITECTURES)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -mtune=native")
     endif()
     if(NOT CMAKE_CXX_COMPILER_ID MATCHES Clang) # We are using clang-cl
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp")
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -42,8 +42,6 @@
 
 # Note: to compile on ARM (or cross compile), you may need to add the following:
 # -DTARGET_ARCH="armv8-a -mfpu=neon -mfloat-abi=softfp -target arm-linux-gnueabi"
-set(TARGET_ARCH "native" CACHE STRING "Target architecture arguments")
-string(REGEX MATCH "emulated\\<[0-9]+\\>" TARGET_EMULATED ${TARGET_ARCH})
 
 if (TARGET_EMULATED)
     message(STATUS "Using emulated target: ${TARGET_EMULATED}")
@@ -100,7 +99,6 @@
         include_directories(/usr/${ARM_ARCH_DIRECTORY}/include/)
         if(NOT CMAKE_CXX_FLAGS MATCHES "-march")
             message(STATUS "SETTING ARCH TO ${TARGET_ARCH}")
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${TARGET_ARCH}")
         endif()
         if(ARM_ARCH_DIRECTORY MATCHES "arm-linux-gnueabi")
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfpu=neon -mfloat-abi=softfp -target arm-linux-gnueabi")
@@ -110,16 +108,13 @@
         message(STATUS "CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
         message(STATUS "CMAKE_CXX_LINK_EXECUTABLE: ${CMAKE_CXX_LINK_EXECUTABLE}")
     elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^ppc64"  OR ${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=${TARGET_ARCH} -mtune=${TARGET_ARCH}")
     elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "riscv64")
         # Nothing specific
     elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "powerpc")
         # Nothing specific
     elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "s390x")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=z14 -mzvector")
     elseif(NOT WIN32 AND NOT EMSCRIPTEN)
         if(TARGET_ARCH AND NOT CMAKE_CXX_FLAGS MATCHES "-march" AND NOT CMAKE_CXX_FLAGS MATCHES "-arch" AND NOT CMAKE_OSX_ARCHITECTURES)
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${TARGET_ARCH}")
         endif()
     endif()
 endif()