Re: Struct Error

From	Ben Bacarisse <ben@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: Struct Error
Date	2025-01-22 21:00 +0000
Organization	A noiseless patient Spider
Message-ID	<87sepa36nv.fsf@bsb.me.uk> (permalink)
References	<vmr5gg$137jo$1@dont-email.me> <20250122112439.579@kylheku.com>

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Kaz Kylheku <643-408-1753@kylheku.com> writes:

> On 2025-01-22, bart <bc@freeuk.com> wrote:
>> Gcc 14.1 gives me an error compiling this code:
>>
>>    struct vector;
>>    struct scenet;
>>
>>    struct vector {
>>        double x;
>>        double y;
>>        double z;
>>    };
>>
>>    struct scenet {
>>        struct vector center;
>>        double radius;
>>        struct scenet (*child)[];
>>    };
>>
>> The error is:
>>
>>    error: array type has incomplete element type 'struct scenet'
>>     struct scenet (*child)[];
>>                    ^~~~~
>
> This looks like a bug to me. There is on reason why an
> incomplete array type (a pointer to which /is/ allowed!)
> should be constrained to have a complete element.

It may be a bug in the standard, but it's not a bug in the compiler:

  6.7.6.2 Array declarators
  Constraints

  ... The element type shall not be an incomplete or function type. ...

There is no dispensation that avoids this constraint when a pointer to
such an array is being declared (the constraint is on the array
declarator) nor when is type will be soon completed.

-- 
Ben.

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Thread

Struct Error bart <bc@freeuk.com> - 2025-01-22 16:14 +0000
  Re: Struct Error Kaz Kylheku <643-408-1753@kylheku.com> - 2025-01-22 20:05 +0000
    Re: Struct Error Ben Bacarisse <ben@bsb.me.uk> - 2025-01-22 21:00 +0000
  Re: Struct Error Richard Harnden <richard.nospam@gmail.invalid> - 2025-01-22 20:08 +0000
  Re: Struct Error Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-01-22 22:27 +0000
  Re: Struct Error James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-01-22 20:05 -0500
    Re: Struct Error learningcpp1@gmail.com (m137) - 2025-01-23 03:49 +0000
      Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-22 23:15 -0800
      Re: Struct Error James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-01-23 03:37 -0500
    Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-22 23:31 -0800
    Re: Struct Error bart <bc@freeuk.com> - 2025-01-23 10:54 +0000
      Re: Struct Error BGB <cr88192@gmail.com> - 2025-01-23 14:58 -0600
        Re: Struct Error bart <bc@freeuk.com> - 2025-01-24 00:51 +0000
          Re: Struct Error BGB <cr88192@gmail.com> - 2025-01-24 00:27 -0600
          Re: Struct Error David Brown <david.brown@hesbynett.no> - 2025-01-24 09:45 +0100
            Re: Struct Error Kaz Kylheku <643-408-1753@kylheku.com> - 2025-01-24 20:31 +0000
              Re: Struct Error bart <bc@freeuk.com> - 2025-01-24 22:53 +0000
              Re: Struct Error James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-01-24 20:53 -0500
          Re: Struct Error James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-01-24 08:43 -0500
            Re: Struct Error bart <bc@freeuk.com> - 2025-01-24 23:32 +0000
      Re: Struct Error Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-01-23 23:50 +0000
        Re: Struct Error bart <bc@freeuk.com> - 2025-01-24 00:37 +0000
          Re: Struct Error Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-01-24 00:57 +0000
            Re: Struct Error Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-01-23 17:23 -0800
            Re: Struct Error bart <bc@freeuk.com> - 2025-01-24 01:27 +0000
      Re: Struct Error James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-01-24 08:24 -0500
      Re: Struct Error Michael S <already5chosen@yahoo.com> - 2025-01-24 16:37 +0200
        Re: Struct Error bart <bc@freeuk.com> - 2025-01-26 19:14 +0000
          Re: Struct Error Michael S <already5chosen@yahoo.com> - 2025-01-26 23:14 +0200
          Re: Struct Error Kaz Kylheku <643-408-1753@kylheku.com> - 2025-01-27 04:05 +0000
            Re: Struct Error bart <bc@freeuk.com> - 2025-01-27 20:19 +0000
          Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-29 02:59 -0800
            Re: Struct Error bart <bc@freeuk.com> - 2025-01-29 11:36 +0000
              Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-30 11:51 -0800
            Re: Struct Error Richard Damon <richard@damon-family.org> - 2025-01-29 07:32 -0500
              Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-29 07:52 -0800
  Re: Struct Error Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-01-22 23:11 -0800
  Re: Struct Error Andrey Tarasevich <noone@noone.net> - 2025-02-02 20:35 -0800

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