[GSoC]Fortran – run-time argument checking

[Gwen Fu]

I found out that "-fcheck=*" is an option for runtime checking, but the
relevant options are commented out.
  OPT_fcheck_ = 1070,                        /* -fcheck= */
  /* OPT_fcheck_assert = 1071, */            /* -fcheck=assert */
  /* OPT_fcheck_bounds = 1072, */            /* -fcheck=bounds */
  /* OPT_fcheck_in = 1073, */                /* -fcheck=in */
  /* OPT_fcheck_invariant = 1074, */         /* -fcheck=invariant */
  /* OPT_fcheck_out = 1075, */               /* -fcheck=out */
  /* OPT_fcheck_switch = 1076, */            /* -fcheck=switch */
  OPT_fcheckaction_ = 1077,                  /* -fcheckaction= */
  OPT_fchecking = 1078,                      /* -fchecking */

And I tried :
$ gfortran -o fibonacci fabonaqi.f90 -fcheck=in
f951: Warning: command-line option ‘-fpreconditions’ is valid for D but not
for Fortran
$ gfortran --help=check
cc1: warning: unrecognized argument to ‘--help=’ option: ‘check’
So what's wrong with these ?