The option -Werror makes warnings fatal. With the more thorough checking of headers since gcc 4.1, it frequently becomes necessary to prevent -Werror from being set. If I were to give a personal opinion, the idea of ascribing a numerical value to NULL seems sufficiently objectionable to deserve fatality.
so if i understand correctly now in gcc 4.1 all warnings are treated as errors and it will not let the link phase happen and hence the build will fail. Satya
