cmake: remove vs (before 2015) warnings

CMakeCommon/SetCompilerFlags.cmake

@@ -86,19 +86,23 @@ function(SetVisualStudioCompilerFlags)
     #         This is only an informational warning about which functions
     #         have been inlined by the compiler.
     # 4255 -> Deactivates warning "no function prototype given converting () to (void)"
-	#
+    #
     # Locally suppressed warnings (should not be globally suppressed):
     # 4640 -> Information that local static variable initialization is not
     #         thread-safe.
     #
-	# VS 2015 specific warnings:
-	# 5026 -> Move constructor was implicitly defined as deleted
+    # VS 2015 specific warnings:
+    # 5026 -> Move constructor was implicitly defined as deleted
     # 5027 -> Move assignment operator was implicitly defined as deleted
-	#
-    set(warning_flags "/Wall /wd4820 /wd4514 /wd4668 /wd4710 /wd4350 /wd4571 /wd4625 /wd4626 /wd4711 /wd4255 /wd5026 /wd5027")
-	if (WARNINGS_ARE_ERRORS STREQUAL ON)
+    #
+    set(warning_flags "/Wall /wd4820 /wd4514 /wd4668 /wd4710 /wd4350 /wd4571 /wd4625 /wd4626 /wd4711 /wd4255")
+    if (WARNINGS_ARE_ERRORS STREQUAL ON)
       set(warning_flags "${warning_flags} /WX")
-	endif()
+    endif()
+    string(FIND "${CMAKE_GENERATOR}" "Visual Studio 14 2015" vs2015_state)
+    if (vs2015_state EQUAL 0)
+      set(warning_flags "${warning_flags} /wd5026 /wd5027")
+    endif()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${warning_flags}" PARENT_SCOPE)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${warning_flags}" PARENT_SCOPE)
   endif()