Disallow run-time dereferencing of null pointers.

  Disable some remarks:

    #4227: padding struct with n bytes to align member.

    #4255: padding size of struct with n bytes to alignment boundary.

option to specify dis(activation) of compiler optimizations.

If option is specified, it will be honored independant of the
--(dis|en)able-debug option.

option to specify dis(activation) of picky compiler warnings.

If option is specified, it will be honored independant of the
--(dis|en)able-debug option.

If option is not specified, it will follow --(dis|en)able-debug
setting, whose default is disabled if not specified.

otherwise gethostbyname() is not detected.

  Disable floating point optimizations

inet_pton function is available.

inet_ntop function is available.

  Disable remark #279: controlling expression is constant

      Remark triggered mostly on va_arg() and FD_ZERO() macros.

check for winsock build target configurations

and HAVE_STRNCASECMP.

  Disable remark #981: operands are evaluated in unspecified order

      Function calls which are triggering this remark, today, do not depend
      on the order of evaluation of its arguments.

  Disable remark #1469: "cc" clobber ignored

      Remark triggered on htons() and ntohs() due to glibc header files.

we select ANSI C89 dialect plus GNU extensions.

that lacks the writev function.