Make VortexM4 available in DYNAMIC_ARCH on MacOS only

Author: martin-frbg

cmake/arch.cmake

@@ -39,7 +39,10 @@ if (DYNAMIC_ARCH)
         set(DYNAMIC_CORE ${DYNAMIC_CORE} NEOVERSEV1 NEOVERSEN2 ARMV8SVE A64FX)
       endif ()
       if (${CMAKE_C_COMPILER_VERSION} VERSION_GREATER_EQUAL 14) # SME ACLE supported in GCC >= 14
-        set(DYNAMIC_CORE ${DYNAMIC_CORE} ARMV9SME VORTEXM4)
+        set(DYNAMIC_CORE ${DYNAMIC_CORE} ARMV9SME)
+      endif()
+	  if (${CMAKE_C_COMPILER_ID} MATCHES "Clang" AND ${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
+	    set(DYNAMIC_CORE ${DYNAMIC_CORE} VORTEXM4)
       endif()
     elseif (${CMAKE_C_COMPILER_ID} MATCHES "Clang")
       if (${CMAKE_C_COMPILER_VERSION} VERSION_GREATER_EQUAL 11) # SVE ACLE supported in LLVM >= 11