[PATCH, Fortran] Four small DEC extensions

[Jerry DeLisle]

On 10/24/2016 07:23 AM, Fritz Reese wrote:
> https://gcc.gnu.org/ml/fortran/2016-10/msg00087.html et. al.
>> On 12/10/16 13:30, Fritz Reese wrote:
>>> Here I submit for review four small extensions to the GNU Fortran
>>> frontend for compatibility with legacy code. I figure it might be a
>>> nice change of pace from my larger patches. Never fear, for I have
>>> more large patches to come, which I will continue to submit
>>> one-at-a-time.
>
> Sorry I took a break from this last week. Back on it this week. I
> really hope I can get the rest of my major extensions in before the
> next release stage, which is apparently imminent, so I might have an
> overwhelming number of submissions this week...
>
> Here's how I'm thinking of the flags situation: we use -std=legacy for
> old compatibility stuff that users shouldn't use, and -fdec for
> ancient compatibility stuff that users _really_ shouldn't use. So if a
> user wants the compiler to mimic an old DEC compiler they hit -fdec
> and get -std=legacy and all the bells and whistles of the
> deleted/obsolete/compatibility extensions without question. Otherwise
> they can just use -std=legacy for a more reasonable compilation, or
> -std=gnu for some such extensions with reasonable warnings.
>
> Anyway, here's a resubmission of the several patches for the four
> extensions mentioned previously, plus an initial cleanup patch for
> -fdec. Sorry to pork-barrel the cleanup patch in here, but it combines
> some stuff I've been meaning to touch up with the change of making
> -fdec into flag_dec using Fortran Var. (This is necessary for the
> type-print and future extensions to be enabled with -fdec without
> their own flag.)
>
> To summarize, we have
> 0001 Cleanup -fdec: rolls some options in with fdec that were
> documented as being a part of it previously (-fdollar-ok,
> -fcray-pointer, -fd-lines-as-comments, legacy/deleted/obsolete feature
> standard bits) and moves fdec-structure out of gfc_option to use
> Fortran Var.
> 0002 [always] Form feed: feed characters ('\f') accepted as whitespace in source
> 0003 [-fdec] TYPE is an alias for PRINT
> 0004 [-std=legacy] %LOC() can be used as an rval (like the LOC() intrinsic)
> 0005 [-std=legacy] Support for .XOR. operator (same as .NEQV.)
>
> The -std=legacy extensions of course compile clean with -std=legacy,
> give warnings with-std=gnu, and give errors with -std=f*.
>
> OK for trunk now? (regtests x86_64-redhat-linux)
>

God do go!

Jerry