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Groups > comp.lang.c > #106796
| From | David Brown <david.brown@hesbynett.no> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: struct padding question |
| Date | 2017-03-23 14:08 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <ob0h7f$m6v$1@dont-email.me> (permalink) |
| References | <ob062g$coi$1@dont-email.me> <ob0ck3$62c$1@dont-email.me> |
On 23/03/17 12:50, BartC wrote:
> On 23/03/2017 09:58, MehdiAmini wrote:
>
>> static struct data
>> { uint64_t ctr[N];
>> long double mean;
>> long double variance;
>> long double * probability_ptr;
>>
>> } my_data;
>
>> // Compiling the above code I get the warning, how to fix it?
>>
>> clang -pedantic -Weverything -Wall -m64 -std=c11
>>
>> warning: padding size of 'struct data' with 8 bytes to alignment
>> boundary [-Wpadded]
>> static struct data
>
> Well, you did ask for 'everything', and the compiler took you literally.
>
> Here, the message shouldn't really be a warning, but a 'note', which is
> just advisory information. There's nothing actually wrong.
The warning exists because for some people, and some code, padding
structs means there /is/ something wrong. That is why I use it in a lot
of my code. But in this case, as for most "normal PC" software, it is
not a problem.
>
> A warning would have been justified if the struct /wasn't/ padded, when
> it was necessary.
>
That would be a warning along the lines of "internal compiler error -
something is broken in the compiler". ICE's are generally fatal, not
warnings, and they are not optional.
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struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 14:28 +0430
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 11:28 +0100
Re: struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 16:44 +0430
Re: struct padding question jm.bourguet@gmail.com - 2017-03-23 05:30 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-03-23 08:45 -0700
Re: struct padding question Noob <root@127.0.0.1> - 2017-04-01 19:15 +0200
Re: struct padding question tim prince <n8tm@aol.com> - 2017-04-01 14:41 -0400
Re: struct padding question supercat@casperkitty.com - 2017-04-02 09:15 -0700
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-04-03 13:51 +0000
Re: struct padding question supercat@casperkitty.com - 2017-04-03 07:48 -0700
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-04-03 15:47 +0000
Re: struct padding question supercat@casperkitty.com - 2017-04-03 09:24 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 11:43 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-01 13:46 -0500
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 12:00 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-01 16:40 -0500
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-04-01 15:24 -0700
Re: struct padding question Robert Wessel <robertwessel2@yahoo.com> - 2017-04-03 17:46 -0500
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 11:50 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 14:08 +0100
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 13:31 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 14:46 +0100
Re: struct padding question BartC <bc@freeuk.com> - 2017-03-23 14:07 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 15:52 +0100
Re: struct padding question scott@slp53.sl.home (Scott Lurndal) - 2017-03-23 17:19 +0000
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 19:57 +0100
Re: struct padding question Ian Pilcher <arequipeno@gmail.com> - 2017-03-23 08:52 -0500
Re: struct padding question David Brown <david.brown@hesbynett.no> - 2017-03-23 15:54 +0100
Re: struct padding question supercat@casperkitty.com - 2017-03-23 08:29 -0700
Re: struct padding question GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 14:04 +0100
Re: struct padding question MehdiAmini <atorrses@gmail.com> - 2017-03-23 20:32 +0430
Re: struct padding question GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-03-23 18:35 +0100
Re: struct padding question supercat@casperkitty.com - 2017-03-23 12:02 -0700
Re: struct padding question Keith Thompson <kst-u@mib.org> - 2017-03-23 12:21 -0700
Re: struct padding question supercat@casperkitty.com - 2017-03-23 12:55 -0700
Re: struct padding question Les Cargill <lcargill99@comcast.com> - 2017-03-25 15:12 -0500
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