added support for MSVC

dev/externals/mctools/CMakeLists.txt

@@ -4,14 +4,14 @@ if(APPLE)
 #  SET(CMAKE_EXE_LINKER_FLAGS "-static")
 else()
   if(MINGW OR MSVC)
-    set(CMAKE_C_FLAGS "-O3 -DWIN32 -D_WIN32 -fomit-frame-pointer  -funroll-loops")
+    set(CMAKE_C_FLAGS "-O2 -DWIN32 -D_WIN32 -fomit-frame-pointer  -funroll-loops")
     if(MINGW)
-        set(CMAKE_CXX_FLAGS "-O3 -DWIN32 -D_WIN32 -fomit-frame-pointer  -funroll-loops -static-libgcc -static-libstdc++")
+        set(CMAKE_CXX_FLAGS "-O2 -DWIN32 -D_WIN32 -fomit-frame-pointer  -funroll-loops -static-libgcc -static-libstdc++")
     else()
-        set(CMAKE_CXX_FLAGS "-O3 -DWIN32 -D_WIN32 -fomit-frame-pointer  -funroll-loops)
-    endif
+        set(CMAKE_CXX_FLAGS "-O2 -DWIN32 -D_WIN32")
+    endif()
   else()
-    set(CMAKE_C_FLAGS "-O3 -Wall -Dlinux -Dunix -fomit-frame-pointer -funroll-loops")
+    set(CMAKE_C_FLAGS "-O2 -Wall -Dlinux -Dunix -fomit-frame-pointer -funroll-loops")
   endif()
 endif()