Re: Call to a function

From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: Call to a function
Date	2023-10-29 05:47 -0700
Organization	A noiseless patient Spider
Message-ID	<86msw11tpp.fsf@linuxsc.com> (permalink)
References	(2 earlier) <87zg1et4wv.fsf@nosuchdomain.example.com> <86jzs3de3h.fsf@linuxsc.com> <87h6n7tkv4.fsf@nosuchdomain.example.com> <86ttqf2w6p.fsf@linuxsc.com> <uha85r$ha56$1@dont-email.me>

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James Kuyper <jameskuyper@alumni.caltech.edu> writes:

> On 10/24/23 8:54 PM, Tim Rentsch wrote:
>
>> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>>
>>> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>>> [...]
>>>
>>>> The point isn't quite the same.  The C standard explicitly says
>>>> integers may be converted to any pointer type.  The C standard
>>>> does not say that a pointer to an object type may be converted
>>>> to a pointer to function type.  Every implementation is within
>>>> its rights to reject any program whose static text includes[*] a
>>>> cast from a pointer to an object type to a pointer to function
>>>> type, regardless of whether the cast has any chance of being
>>>> executed.
>>>>
>>>> [*] meaning, still present as source of any preprocessor
>>>> conditionals have been processed, etc.
>>>
>>> I disagree.  (I think we've discussed this before.)
>>>
>>> Concretely, I believe that this program violates no syntax error
>>> or constraint.  It includes code whose behavior would be undefined
>>> if it were executed, but the `if (0)` prevents that.
>>>
>>> On what basis do you think a conforming implementation may reject
>>> it?
>>
>> First let me ask a question.  Does the C standard allow an
>> implementation to reject any program that is not strictly
>> conforming?
>
> [...]
>
> The standard never talks about rejection.  It requires that "A
> conforming hosted implementation shall accept any strictly
> conforming program.".  No such requirement applies to any program
> which is not strictly conforming.  (4p6)

Perhaps I shouldn't have used the word "reject".  If the question
were phrased "Does the C standard allow an implementation not to
accept any program that is not strictly conforming?", does your
comment above mean you would say Yes to that question?

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Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-10-29 05:47 -0700
  Re: Call to a function Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-10-29 14:40 -0700
    Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-11-10 06:33 -0800
    Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-11-17 21:16 -0800
    Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-11-19 00:09 -0800
      Re: Call to a function Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-11-19 13:20 -0800
        Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-01-19 12:49 -0800
          Re: Call to a function Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-01-22 03:27 +0000
            Re: Call to a function Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-01-21 20:14 -0800
            Re: Call to a function scott@slp53.sl.home (Scott Lurndal) - 2024-01-22 16:36 +0000
              Re: Call to a function Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-01-22 22:05 +0000
    Re: Call to a function James Kuyper <jameskuyper@alumni.caltech.edu> - 2023-11-19 18:50 -0500
      Re: Call to a function Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-01-22 18:11 -0800
      Re: Call to a function James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-01-23 14:19 -0500

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