Re: How to fix warning: [-Wdate-time]

From	James Kuyper <jameskuyper@verizon.net>
Newsgroups	comp.lang.c
Subject	Re: How to fix warning: [-Wdate-time]
Date	2017-04-22 22:45 -0400
Organization	A noiseless patient Spider
Message-ID	<odh49g$nu7$1@dont-email.me> (permalink)
References	(4 earlier) <lnpogdtjmy.fsf@kst-u.example.com> <195fbe3a-b69c-45e4-ac6e-a45a1913a834@googlegroups.com> <od2p00$v2c$1@dont-email.me> <36a7bba0-fa4d-59e4-16f8-1dcebce0cd84@verizon.net> <58fbc876.47759078@news.xs4all.nl>

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On 04/22/2017 05:20 PM, Richard Bos wrote:
> "James R. Kuyper" <jameskuyper@verizon.net> wrote:
> 
>> On 04/17/2017 12:06 PM, Ken Brody wrote:
> 
>>> Looking at N1256 (yes, I know it's not the latest, but it's the latest I
>>> have on this computer), section 6.10.8 says this about __DATE__:
>>>
>>>      "If the date of translation is not available, an implementation-defined
>>>      valid date shall be supplied."
>>>
>>> A similar statement is made about __TIME__.
>>>
>>> Without a detailed explanation of what "is not available" means, you could
>>> easily say that "using compiler flag X will cause the compiler to behave as
>>> if the date and time are not available" is still conforming.
>>
>> Yes, it would be trivial to support such a flag - but if the date and 
>> time are in fact available, and the compiler is just pretending 
>> otherwise, providing any other date and time value renders it 
>> non-conforming, despite that pretense.
>>
>> By analogy: if you and I have a formal written agreement that I will pay 
>> you a specified amount of money to fix my windows, then if I pretend 
>> that I can't see that your repairs are complete, and therefore refuse to 
>> pay you, I'm still in violation of our agreement, despite that pretense.
> 
> On the other hand, if I have a Moroccan restaurant and one of my dishes
> is a tajine with chicken, dates, tomatoes and ras el hanout; and you
> order that tajine but say "hold the dates, please"; then I am not in
> contravention of any Trading Standards Act if I serve it to you without.
> 
> Analogies, I'm afraid, make good illustrations but bad rules.

I don't see a problem with either analogy. Your analogy corresponds to
to a case where someone wants non-conforming behavior from a compiler,
non-conforming behavior that the compiler promises to provide if the
appropriate option is selected. It's perfectly true that they have no
legitimate grounds for complaint if they get that behavior when choosing
that option. But it's also still true that the behavior is
non-conforming. I was objecting to the claim that the implementation
could be considered "still conforming" - I wasn't saying anything about
whether or not the users would be happy to see it fail to conform in
that fashion - obviously they would be if their use of that option was
deliberate.

Thread

How to fix warning: [-Wdate-time] MehdiAmini <atorrses@gmail.com> - 2017-04-13 14:44 +0430
  Re: How to fix warning: [-Wdate-time] Barry Schwarz <schwarzb@dqel.com> - 2017-04-13 05:28 -0700
    Re: How to fix warning: [-Wdate-time] MehdiAmini <atorrses@gmail.com> - 2017-04-14 12:55 +0430
      Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-14 08:50 -0700
        Re: How to fix warning: [-Wdate-time] Ken Brody <kenbrody@spamcop.net> - 2017-04-14 13:42 -0400
          Re: How to fix warning: [-Wdate-time] James Kuyper <jameskuyper@verizon.net> - 2017-04-14 14:26 -0400
            Re: How to fix warning: [-Wdate-time] David Brown <david.brown@hesbynett.no> - 2017-04-17 16:26 +0200
              Re: How to fix warning: [-Wdate-time] "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-17 10:52 -0400
                Re: How to fix warning: [-Wdate-time] David Brown <david.brown@hesbynett.no> - 2017-04-17 20:00 +0200
              Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-17 08:08 -0700
                Re: How to fix warning: [-Wdate-time] David Brown <david.brown@hesbynett.no> - 2017-04-17 20:04 +0200
        Re: How to fix warning: [-Wdate-time] Mehdi Amini <atorrses@gmail.com> - 2017-04-15 07:50 +0430
          Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-15 15:05 -0700
            Re: How to fix warning: [-Wdate-time] Ken Brody <kenbrody@spamcop.net> - 2017-04-17 11:42 -0400
              Re: How to fix warning: [-Wdate-time] supercat@casperkitty.com - 2017-04-17 08:55 -0700
              Re: How to fix warning: [-Wdate-time] "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-17 11:57 -0400
  Re: How to fix warning: [-Wdate-time] gazelle@shell.xmission.com (Kenny McCormack) - 2017-04-13 13:09 +0000
    Re: How to fix warning: [-Wdate-time] jadill33@gmail.com - 2017-04-13 06:27 -0700
      Re: How to fix warning: [-Wdate-time] supercat@casperkitty.com - 2017-04-15 08:56 -0700
        Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-15 15:01 -0700
          Re: How to fix warning: [-Wdate-time] supercat@casperkitty.com - 2017-04-16 11:44 -0700
            Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-16 13:45 -0700
              Re: How to fix warning: [-Wdate-time] Ken Brody <kenbrody@spamcop.net> - 2017-04-17 12:14 -0400
            Re: How to fix warning: [-Wdate-time] Ken Brody <kenbrody@spamcop.net> - 2017-04-17 12:06 -0400
              Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-17 09:25 -0700
              Re: How to fix warning: [-Wdate-time] "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-17 12:45 -0400
                Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-17 12:02 -0700
                Re: How to fix warning: [-Wdate-time] "James R. Kuyper" <jameskuyper@verizon.net> - 2017-04-17 15:23 -0400
                Re: How to fix warning: [-Wdate-time] Lowell Gilbert <lgusenet@be-well.ilk.org> - 2017-04-18 13:27 -0400
                Re: How to fix warning: [-Wdate-time] Ken Brody <kenbrody@spamcop.net> - 2017-04-18 14:23 -0400
                Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-18 12:10 -0700
                Re: How to fix warning: [-Wdate-time] raltbos@xs4all.nl (Richard Bos) - 2017-04-22 21:20 +0000
                Re: How to fix warning: [-Wdate-time] James Kuyper <jameskuyper@verizon.net> - 2017-04-22 22:45 -0400
          Re: How to fix warning: [-Wdate-time] Tim Rentsch <txr@alumni.caltech.edu> - 2017-04-17 11:30 -0700
            Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-17 12:30 -0700
              Re: How to fix warning: [-Wdate-time] raltbos@xs4all.nl (Richard Bos) - 2017-04-22 21:24 +0000
                Re: How to fix warning: [-Wdate-time] Tim Rentsch <txr@alumni.caltech.edu> - 2017-04-27 13:33 -0700
              Re: How to fix warning: [-Wdate-time] Tim Rentsch <txr@alumni.caltech.edu> - 2017-04-27 13:26 -0700
    Re: How to fix warning: [-Wdate-time] gordonb.5zr1e@burditt.org (Gordon Burditt) - 2017-04-14 13:35 -0500
      Re: How to fix warning: [-Wdate-time] supercat@casperkitty.com - 2017-04-14 12:17 -0700
        Re: How to fix warning: [-Wdate-time] gordonb.k4gmo@burditt.org (Gordon Burditt) - 2017-04-16 00:04 -0500
        Re: How to fix warning: [-Wdate-time] Noob <root@127.0.0.1> - 2017-04-16 11:04 +0200
          Re: How to fix warning: [-Wdate-time] supercat@casperkitty.com - 2017-04-16 11:52 -0700
          Re: How to fix warning: [-Wdate-time] raltbos@xs4all.nl (Richard Bos) - 2017-04-22 21:28 +0000
    Re: How to fix warning: [-Wdate-time] Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-04-18 21:34 -0600
  Re: How to fix warning: [-Wdate-time] Keith Thompson <kst-u@mib.org> - 2017-04-17 08:09 -0700

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