Using nehalem arch in portable build

Author: HeDo88TH

CMakeLists.txt

@@ -23,13 +23,14 @@ if (NOT WIN32 AND NOT APPLE)
 endif()
 
 if((CMAKE_CXX_COMPILER_ID MATCHES "Clang") OR (CMAKE_CXX_COMPILER_ID MATCHES "GNU"))
-    if(NOT PORTABLE_BUILD)
-        if(NOT ((${CMAKE_SYSTEM_PROCESSOR} STREQUAL "aarch64") OR (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm64")))
+    if(NOT ((${CMAKE_SYSTEM_PROCESSOR} STREQUAL "aarch64") OR (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm64")))
+        if(NOT PORTABLE_BUILD)
             message("Building with native optimizations")
             add_compile_options(-march=native)
+        else()
+            message("Building portable binaries")
+            add_compile_options(-march=nehalem)
         endif()
-    else()
-        message("Building portable binaries")
     endif()
 endif()