Change Flag name for opertors +=, -= if we use Intel compiler (To check on Linux)

CMakeLists.txt

@@ -209,8 +209,14 @@ ENDIF()
 
 MESSAGE( STATUS "ScalFMM_USE_SSE              = ${ScalFMM_USE_SSE}" )
 if( ScalFMM_USE_SSE )
+  
   IF(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
-#    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -vec -axSSE4.2")
+ # Set flag for old intel compiler          TODO
+        MESSAGE(STATUS "INTEL COMPILER IS ${INTEL_VERSION} ")
+    if(  ${INTEL_VERSION} LESS "15.0.0") 
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__OLD_INTEL_COMPILER")
+        MESSAGE(STATUS "INTEL COMPILER LOWER 15.0.0")
+    ENDIF()
   ELSE()
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse -msse2 -msse3 -mfpmath=sse")
   ENDIF()
@@ -222,7 +228,10 @@ endif()
 MESSAGE(STATUS "ScalFMM_USE_AVX               = ${ScalFMM_USE_AVX}")
 if(ScalFMM_USE_AVX)
   IF(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
-    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ")
+      if(  ${INTEL_VERSION} LESS "15.0.0") 
+      	    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__OLD_INTEL_COMPILER")
+       	 MESSAGE(STATUS "INTEL COMPILER LOWER 15.0.0")
+    ENDIF()
   ELSE()
     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse -msse2 -msse3 -mfpmath=sse -mavx")
   ENDIF()

Src/Utils/FAvx.hpp

@@ -3,7 +3,7 @@
 
 #include "immintrin.h"
 
-#ifdef __INTEL_COMPILER
+#ifdef __OLD_INTEL_COMPILER
 
 //Side effect operators DOUBLE
 inline __m256d& operator+=(__m256d & a, const __m256d & b){

Src/Utils/FSse.hpp

@@ -11,7 +11,7 @@
 #include <smmintrin.h> // SSE4
 #endif
 
-#ifdef __INTEL_COMPILER
+#ifdef __OLD_INTEL_COMPILER
 
 inline __m128d& operator+=(__m128d& v1, const __m128d& v2){
     return (v1 = _mm_add_pd(v1, v2));