Restore LTO support under VS2013

indra/cmake/00-Common.cmake

@@ -85,18 +85,18 @@ if (WINDOWS)
   
   if (USE_LTO)
     if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
-      if(INCREMENTAL_LINK)
-        set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LTCG:incremental")
-        set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /LTCG:incremental")
-        set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /LTCG")
-      else(INCREMENTAL_LINK)
+      # if(INCREMENTAL_LINK)
+      #   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LTCG:incremental")
+      #   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /LTCG:incremental")
+      #   set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /LTCG")
+      # else(INCREMENTAL_LINK)
         set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LTCG")
         set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /LTCG")
         set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /LTCG")
-      endif(INCREMENTAL_LINK)
+      # endif(INCREMENTAL_LINK)
       set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /OPT:REF /OPT:ICF /INCREMENTAL:NO")
       set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /OPT:REF /OPT:ICF /INCREMENTAL:NO")
-      set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL /Gy /Gw")
+      set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL /Gy")
     elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
       if(INCREMENTAL_LINK)
         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -flto=thin -fwhole-program-vtables /clang:-fforce-emit-vtables")