add ability to turn off native arch

Author: rob-p

CMakeLists.txt

@@ -31,7 +31,13 @@ set (BOOST_CXX_FLAGS "-Wno-deprecated-register -std=c++11")
 SET(CMAKE_FIND_LIBRARY_SUFFIXES .a ${CMAKE_FIND_LIBRARY_SUFFIXES})
 
 ## Set the standard required compile flags
-set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -pthread -funroll-loops -fPIC -fomit-frame-pointer -O4 -DHAVE_ANSI_TERM -Wall -std=c++11 -Wreturn-type -Werror=return-type")
+if (NO_NATIVE_ARCH)
+  message (STATUS "DISABLING NATIVE ARCH.")
+else()
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
+endif()
+
+set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread -funroll-loops -fPIC -fomit-frame-pointer -O4 -DHAVE_ANSI_TERM -Wall -std=c++11 -Wreturn-type -Werror=return-type")
 
 ##
 # OSX is strange (some might say, stupid in this regard).  Deal with it's quirkines here.