-I- option is used to specify that any include directories, specified before this option, with the format
#include <foo.h> would be ignored. However include directories of
#include "foo.h" and
#include <foo.h> format would be used during compilation even after
-I- has been used.
This option has been replaced with
-iquote in GCC 4.x series. But C::B always sets the older option. This is the reason of that warning message.
You can safely ignore that warning.
I had prepared a fix for this which I'm testing in my PC. If everything goes fine, I'll put it in main repo in future.
Best Regards,
Biplab