[Patch, Fortran] PR 85841: [F2018] reject deleted features

[Janus Weil]

Hi Steve,

thanks for your comments!

>> The patch still regtests cleanly. Ok for trunk?
>
> Patch looks good to me.  The only thing that worries me is
> whether the patch will cause the SPEC benchmark to throw
> an error or warning that it did not before.  As I don't have
> SPEC benchmark and it cost $$$, I'm not going to let it
> bother too much.

Unfortunately I don't have access to SPEC either. Is anyone in a
position to check this?

If it is indeed a problem, I could remove the warning for the F2018
deleted features with default flags (-std=gnu). However, I'd only like
to do that if it's really necessary.


>> Btw, with the arrival of the F2018 standard, I wonder whether it
>> actually makes sense to keep the option -std=f2008ts, or to remove it
>> in favor of -std=f2018, since the two Technical Specifications covered
>> by this flag are now part of F2018 (and pretty much the main part!).
>> Any opinions on this?
>
> I think that f2008ts can go away.  We may need to do this
> in two step as some users may have f2008ts hardcoded in
> Makefiles.  Probably, issue warning for -std=2008ts and
> map it to -std=2018 for a brief period (3 to 6 months?)
> and then finally remove it.

Yes, I agree that it would be a good idea to keep -std=f2008ts as an
alias for f2018 for a while (possibly until the next release, 9.0),
and document is as deprecated. I can take care of removing the
GFC_STD_F2008_TS macro in a follow-up patch.


Actually there is one other thing I do not like about my previous
patch: The duplication of GFC_STD_* flags in gfc_match_stopcode. To
get rid of this, I'm introducing additional macros in libgfortran.h,
see new patch in the attachment. I hope you agree that this is an
improvement. (Again: Regtests cleanly.)

Cheers,
Janus
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