On Sat, Apr 05, 2025 at 03:16:45PM +0800, Gwen Fu wrote: > My doubt : > 1.Does the compilation option only need to support fortran versions above > 9, o5r does it also need to support fortran 77?
gfortran started life as a Fortran 95 compiler. It should support anything that is Fortran 95 or later. It is unclear why you are referring to Fortran 77. > 2.Regarding parameter checking, *my idea is that after the user creates an > array of a specified size, it is passed into the function as a parameter*. > However, the array size required by the function does not match the size > specified by the user. However, this idea seems to be impossible to > implement in fortran77. *In addition, in addition to implicit and explicit > size arrays, are there other data structures that require parameter type > checking?* The word "parameter" has very a specific meaning in Fortran. The entity that is passed into a function or subroutine is an "actual argument". The entity within the functions associated with the "actual argument" is a "dummy argument". It is not clear to me what you're trying to accomplish. gfortran already has an -fimplicit-none option that enforces no implicit typing. This option will catch the "typo" type error. Gfortran also has the -fallow-argument-mismatch. If the code is within a single file, gfortran will build an explicit interface when it encounters an external procedure, and then it uses that interface to check any additional references. > 3. > 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 Is this related to the project ? I've already pointed out that some of these options do not apply to Fortran. Did you try 'gcc --help=check'? % ~/work/bin/gcc --help=check cc1: warning: unrecognized argument to '--help=' option: 'check' The second result you show is not a gfortran problem. -- Steve
